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Preparation and characterization of microalgae-derived extracellular vesicles and their protective effect on acute alcohol-induced liver injury 认领 引用
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作者 Jiawen Song Lei Zhou +2 位作者 Shengfeng Peng David Julian McClements Wei Liu 《Food Science and Human Wellness》 SCIE CAS CSCD 2026年第5期2310-2322,共13页
Increased levels of alcohol consumption are linked to an increased risk of alcoholic liver disease.As a novel source of national food,microalgae are rich in bioactives and have been demonstrated to confer benefits to ... Increased levels of alcohol consumption are linked to an increased risk of alcoholic liver disease.As a novel source of national food,microalgae are rich in bioactives and have been demonstrated to confer benefits to human health.The effects of microalgae extracellular vesicles(M-EVs)on alcohol-induced liver injury have not been studied previously.In this study,3 types of M-EVs were isolated using a combination of tangential flow filtration(TFF)and size exclusion chromatography(SEC).The structure and composition of M-EVs were characterized and the safety and liver-accumulation of M-EVs were also confirmed.Results shown that 3 types M-EVs were shown to be colloidal particles((198.9±7.2),(191.7±5.1),and(259.5±8.1)nm)with negative charge((-25.0±1.6),(-21.4±0.6),and(-22.4±1.6)mV).M-EVs were able to reduce the levels of alanine aminotransferase(ALT),aspartate aminotransferase(AST),alkaline phosphatase(ALP),and triglycerides(TGs)in the mice and regulated the levels of malondialdehyde(MDA),glutathione(GSH),and superoxide dismutase(SOD),which protected the mice against oxidative damage and inflammation caused by alcohol-induced liver injury.In addition,the M-EVs may also have alleviated alcohol-induced liver injury through activation of the Nrf2/HO-1 signaling pathway and regulation of CYP2E1 expression,as well as by modulating the diversity and composition of the gut microbiota.The potentially beneficial effects of M-EVs on alcoholic liver disease may provide a theoretical basis for further exploration of the health function of M-EVs in the food industry. 展开更多
关键词 Alcohol-induced liver injury Microalgae Extracellular vesicles Nrf2/HO-1 signaling pathway Gut microbiota
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CRISPR-enhanced microalgae biosynthesis:a promising approach for future functional feed ingredients 认领 引用
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作者 Zhen Li Cong Li +5 位作者 Huan Liu Yihao Wang Yahui Sun De-Xing Hou Jianhua He Shusong Wu 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2026年第3期1203-1224,共22页
Microalgae are photosynthetic microorganisms capable of synthesizing diverse high-value bioactive compounds,including premium proteins,polyunsaturated fatty acids,pigments,and vitamins.These natural products exhibit s... Microalgae are photosynthetic microorganisms capable of synthesizing diverse high-value bioactive compounds,including premium proteins,polyunsaturated fatty acids,pigments,and vitamins.These natural products exhibit significant potential in enhancing livestock growth and health,offering biological activity and nutritional benefits that surpass chemically synthesized alternatives.Nevertheless,the commercial production of microalgae-derived natural products remains insufficient to meet escalating market demands.Utilizing synthetic biology strategies,especially the CRISPR system,to increase productivity of microalgae cell factories is crucial for scaling up high-value product biosynthesis.This article reviews the current applications,construction strategies,and critical pathway nodes in microalgae cell factory,with emphasis on CRISPR-based genome editing breakthroughs for optimizing microalgae nutritional profiles,and recent progress in microalgae utilization for livestock production,providing a forward-looking perspective on future developments. 展开更多
关键词 Biosynthesis CRISPR Feed Genome editing Microalgae Sustainability
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Unraveling the chemistry of microalgae pyrolysis:Connecting macromolecules to diverse high-value products 认领 引用
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作者 Teta Fathya Widawati Bima Prasetya Pancasakti +3 位作者 Divita Hayyu Kinanthi Hanifrahmawan Sudibyo Marcos Arief Budiman 《Resources Chemicals and Materials》 EI 2026年第2期32-79,共48页
The extensive reliance on fossil resources for fuels and platform chemicals has raised critical concerns over resource depletion and increasing greenhouse gas emissions.To address these challenges,microalgae offer a p... The extensive reliance on fossil resources for fuels and platform chemicals has raised critical concerns over resource depletion and increasing greenhouse gas emissions.To address these challenges,microalgae offer a promising sustainable alternative,recognized for their high productivity,efficient CO2 sequestration,and significant capacity to accumulate lipids.Among various conversion strategies,pyrolysis stands out as an effective method for transforming microalgae-derived macromolecules(carbohydrates,proteins,and lipids)into energy-dense products and valuable chemicals.This study provides a detailed mechanistic analysis of pyrolysis pathways,elucidating the formation of nine key product categories:oxygen heterocycles,nitrogen heterocycles,nitrogenous compounds(amines,amides,and nitriles),aldehydes and ketones,carboxylic acids and esters,alcohols,phenols,hydrocarbons,and sulfur-containing compounds.These products are traced to specific macromolecules,with carbohydrates yielding anhydrosugars,furans,and light oxygenates;proteins forming nitrogen-containing compounds;and lipids producing carboxylic acids,esters,and hydrocarbons.Furthermore,synergistic reactions between distinct macromolecules or their derivatives result in unique product distributions,highlighting the complex interplay of reaction pathways.These insights lay the groundwork for optimizing pyrolysis processes,improving product selectivity,and designing advanced catalysts informed by Density Functional Theory(DFT)to address rate-limiting steps.By elucidating these mechanisms,this study advances the sustainable conversion of microalgae into renewable fuels and chemicals,contributing to the development of a more sustainable and environmentally friendly future. 展开更多
关键词 Bio-oil Macromolecules Microalgae Pyrolysis Reaction mechanism
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Responses of antibiotic resistance genes and microbial community in the microalgae-bacteria system under sulfadiazine:Mechanisms and implications 认领 引用
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作者 Shengnan Li Yucan Xi +3 位作者 Ke Wang Nianhong Wan Haiyan Liu Shih-Hsin Ho 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第11期443-456,共14页
Microalgae-bacteria system is an emerging alternative for sustainable wastewater treatment.Exploring the structure and diversity of microbial community in microalgae-bacteria system under sulfadiazine stress can contr... Microalgae-bacteria system is an emerging alternative for sustainable wastewater treatment.Exploring the structure and diversity of microbial community in microalgae-bacteria system under sulfadiazine stress can contribute to the understanding of the sulfadiazine behavior in environments.Furthermore,as important carriers of antibiotic resistance genes(ARGs),microalgae can influence the profiles of ARGs either directly or indirectly through the secretion of metabolites.However,the effects of sulfadiazine on ARGs dissemination of microalgae-bacteria systems remain underreported.Herein,the impacts of sulfadiazine(1 mg/L)on the structural diversity and metabolic activity of microorganisms were examined in microalgae-bacteria systems.Results showed thatmicroalgae-bacteria system could remove NH4+-N better(about 72.3%)than activated sludge system,and hydrolysis was the first step in sulfadiazine degradation.A high level of intI1(5.7×104 copies/mL)was detected in the initial media of the microalgae-bacteria system.Microalgae could hamper the rate of horizontal gene transfer activation.Compared with activated sludge system,the abundance of sul genes(sul1,sul2,sul3,and sulA)was significantly lowered after treating with microalgae-bacteria system.Additionally,the number of proteins and the sum of polysaccharides in the extracellular polymeric substances of the activated sludge system were lower than those of themicroalgae-bacteria system.Microalgae can altermicrobial communities.The genus Rozellomycota predominated all samples.Fungi with relatively high abundance increased in the microalgae-bacteria system,including Dipodascaceae,Rhodotorula,and Geotrichum.These results offer valuable insights into the application processes involving microalgae-bacteria system. 展开更多
关键词 Microalgae Microalgae-bacteria consortia Antibiotic resistance genes Microbial community Chlorella pyrenoidosa Sulfadiazine
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Microalgae-carrying nanomedicine for bioadhesive drug delivery for treating chemotherapy-induced intestinal injury 认领 引用 被引量：1
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作者 Jie Chen Bing Wang +1 位作者 Lan Shen Yongzhuo Huang 《Asian Journal of Pharmaceutical Sciences》 SCIE CAS CSCD 2025年第2期106-119,共14页
Gastrointestinal tract toxicity represents a serious adverse effect of chemotherapy,leading to reduced quality of life and survival.For instance,irinotecan(CPT-11)usually causes severe gastrointestinal toxicity,with a... Gastrointestinal tract toxicity represents a serious adverse effect of chemotherapy,leading to reduced quality of life and survival.For instance,irinotecan(CPT-11)usually causes severe gastrointestinal toxicity,with a lack of effective therapeutic interventions,making treatment often unsustainable.Therefore,development of an effective and safe therapy is crucial for improving chemotherapy efficacy and the patients’quality of life.In this work,we developed a novel approach involving the helical-shaped cyanobacterium microalgae,Spirulina platensis(SP),to carry the bornyl acetate(BA)-loaded chitosan nanoparticles to enhance drug retention in the small intestine.We demonstrated the protection effect of BA against chemotherapy-induced intestinal injury using an epithelial cell model.In a mouse model,orally administered BA-ChNPs@SP accumulated in the small intestine and attenuated inflammation by reducing dsDNA release and oxidative stress.This was concomitant with the restoration of the intestinal barrier and modulation of the immune microenvironment.This work suggests the promise of the microalgae-carrying nanomedicine strategy for treatment of intestinal diseases,emphasizing its potential in addressing chemotherapy-induced gastrointestinal complications. 展开更多
关键词 Microalgae Bioadhesive delivery Chemotherapy-induced intestinal injury Bornyl acetate Macrophages
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Design and optimization of microalgae photobioreactors for treatment of nitrogen and phosphorus in wastewater 认领 引用
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作者 Shanyu Xie Yuanpeng Wang Qingbiao Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第10期222-232,共11页
The use of microalgae to recover nitrogen and phosphorus from wastewater has garnered significant attention,positioning it as one of the most promising and sustainable strategies in modern wastewater treatment.While v... The use of microalgae to recover nitrogen and phosphorus from wastewater has garnered significant attention,positioning it as one of the most promising and sustainable strategies in modern wastewater treatment.While various photobioreactors(PBRs)configurations have been widely applied for microalgae cultivation,limited research has focused on optimizing PBR design specificallyto enhance nitrogen and phosphorus removal efficiency.The high operational costs of wastewater treatment,combined with the inherent variability of microalgal growth,have prompted the search for advanced solutions that improve nitrogen and phosphorus removal while minimizing resource consumption and enabling predictive process control.Recently,the integration of PBR systems with artificialintelligence and machine learning(AI/ML)modeling has emerged as a transformative approach to enhancing nutrient removal,particularly for nitrogen and phosphorus.This study firstsummarizes existing PBR designs tailored for diverse applications,then outlines strategies for system enhancement through the optimization of mixing methods,construction materials,light intensity,and light source configuration.Furthermore,computational fluiddynamics(CFD)and AI/ML modeling are presented as tools to guide the structural design and operational optimization of microalgae-based nitrogen and phosphorus removal processes.Finally,future research directions and key challenges are discussed. 展开更多
关键词 Microalgae Photobioreactor Design Optimization Nitrogen phosphorus removal Artificialintelligence
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Research progress and application of carbon sequestration in industrial flue gas by microalgae: A review 认领 引用 被引量：4
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作者 Rui Wang Xue Wang Tingyu Zhu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第6期14-28,共15页
Global warming caused by the emission of CO2 in industrial flue gas has attractedmore and more attention.Therefore,to fix CO2 with high efficiency and environmentally friendly had become the hot research field.C... Global warming caused by the emission of CO2 in industrial flue gas has attractedmore and more attention.Therefore,to fix CO2 with high efficiency and environmentally friendly had become the hot research field.Compared with the traditional coal-fired power plant flue gas emission reduction technology,carbon fixation and emission reduction by microalgae is considered as a promising technology due to the advantages of simple process equipment,convenient operation and environmental protection.When the flue gas is treated by microalgae carbon fixation and emission reduction technology,microalgae cells can fix CO2 in the flue gas through photosynthesis,and simultaneously absorb NOx and SOx as nitrogen and sulfur sources required for growth.Meanwhile,they can also absorb mercury,selenium,arsenic,cadmium,lead and other heavy metal ions in the flue gas to obtain microalgae biomass.The obtained microalgae biomass can be further transformed into high valueadded products,which has broad development prospects.This paper reviews the mechanisms and pathways of CO2 sequestration,the mechanism and impacts of microalgal emission reduction of flue gas pollutants,and the applications of carbon sequestration in industrial flue gas by microalgae.Finally,this paper provides some guidelines and prospects for the research and application of green emission reduction technology for industrial flue gas. 展开更多
关键词 Microalgae Bio-mitigation Flue gas Carbon sequestration Carbon emission reduction Photosynthetic carbon fixation
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C22-Ceramide Derived from Marine Microalgae Emiliania huxleyi Induces Melanosomal Autophagy via JNK/c-Jun Signaling Pathway in Mouse B16 Melanoma Cells 认领 引用
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作者 WAN Jiyue MA Hui +7 位作者 XU Yuxuan ZHANG Shumiao LI Jian LI Guiling HUANG Shiying YE Xiaotong ZHANG Zhengxiao LIU Jingwen 《Journal of Ocean University of China》 SCIE CAS CSCD 2025年第3期792-808,共17页
Melanosomes are specialized membrane-bound organelles within which melanin is synthesized and stored.The levels of melanin can be effectively reduced by inhibiting melanin synthesis or promoting melanosome degradation... Melanosomes are specialized membrane-bound organelles within which melanin is synthesized and stored.The levels of melanin can be effectively reduced by inhibiting melanin synthesis or promoting melanosome degradation via autophagy.Ceramide,a central molecule in sphingolipid metabolism,has been widely implicated in the regulation of autophagy.Few researchers have addressed the potential effects of ceramide analogs on suppressing melanin synthesis.However,whether ceramide can induce melanosome autophagy and the potential autophagy-dependent mechanism underlying this phenomenon remain unknown.Here,an active compound from the marine microalgae Emiliania huxleyi extract was firstly isolated and identified as a long-chain C22-ceramide(C22-Cer).In vitro results of mouse B16 melanoma cell experiments showed that treatment with 2-5µmol/L C22-Cer significantly suppressed the increase ofα-MSH-induced melanin levels and tyrosinase activity without cytotoxicity.C22-Cer induced typical hallmarks of autophagy such as accumulation of autophagosomes,enhanced autophagic flux and microtubule-associated protein light chain 3,LC3-II expression,and p62 degradation through activating c-Jun N-terminal kinase(JNK)directly.Furthermore,C22-Cer activated JNK-Bcl-2 signaling,dissociated the Beclin1/Bcl-2 complex,and induced melanosome autophagy without affecting the expression of MITF.Besides,the Ca2+influx induced by treatment with C22-Cer further increased the substantial accumulation of autophagosomes.Together,we found a novel marine-derived compound,C22-Cer,targeting JNK pathway and Ca2+signaling to induce melanosome autophagy and suppress melanin accumulation in B16 cells.This study implicates that C22-Cer might be a potential therapeutic mediator against skin pigmentation in mammals. 展开更多
关键词 marine microalgae Emiliania huxleyi C22-ceramide melanosomal autophagy JNKc-Jun signaling pathway mouse B16 cells
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Adaptations,cultivation and commercial prospects of polar microalgae 认领 引用
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作者 Kiat Fatt CHIA Chiew Yen WONG +10 位作者 Rhun Yian KOH Choy Sin LEE Soi Moi CHYE Yih Yih KOK Siti Aqlima AHMAD Peter CONVEY Leyla Cárdenas TAVIE WANG Wei LUO Jiangyi Veeranoot NISSAPATORN Chooi Ling LIM 《Advances in Polar Science》 CSCD 2025年第1期18-40,共23页
Polar microalgae are microscopic organisms adapted to survive in cold and extreme habitats such as sea-ice,glaciers,lakes and snow.These microorganisms provide an essential basis as primary food sources in polar ecosy... Polar microalgae are microscopic organisms adapted to survive in cold and extreme habitats such as sea-ice,glaciers,lakes and snow.These microorganisms provide an essential basis as primary food sources in polar ecosystems.Despite their ecological importance,polar microalgae remain relatively unexplored compared to their tropical and temperate counterparts,largely due to the practical challenges of obtaining and maintaining material from the harsh polar environments.However,interest has recently surged due to their specific adaptations and potential for utilization in various fields.This review explores the survival strategies of polar microalgae and their commercial applications in healthcare and other fields.We also consider the processes involved in processing polar microalgae,from cultivation to extraction of bioactive compounds.Our findings highlight a growing need for research in this rapidly evolving field to unlock the potential of polar microalgae in multiple fields. 展开更多
关键词 polar microalgae microalgal adaptations microalgal processing potential commercial applications
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Biomass Production of Microalgae Scenedesmus in a Raceway and Tubular Photobioreactor 认领 引用
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作者 José F.Reyes Paulina J.Vielma +1 位作者 Wilson D.Esquivel Johannes P.de Bruijn 《Journal of Environmental Science and Engineering(B)》 2025年第6期255-264,共10页
A comparison of culture biomass evolution for the microalgae Scenedesmus spinosus in a tubular pilot photobioreactor of 1.6 m3and a raceway pilot photobioreactor of 1.2 m3was carried out,using a nutritional Z-8 ... A comparison of culture biomass evolution for the microalgae Scenedesmus spinosus in a tubular pilot photobioreactor of 1.6 m3and a raceway pilot photobioreactor of 1.2 m3was carried out,using a nutritional Z-8 medium with the injection of carbon dioxide,and using an electronic system for monitoring and control of operational variables.For three weeks of testing,each culture was exposed to three pH levels of 6.5,7.0 or 7.5,where random samples from both bioreactors were taken three times a week,to analyze pH,turbidity,transmittance at 640 nm and temperature.At the beginning and the end of culture,total solids were analyzed,and photographs were taken with a microscope to study the cell conditions of culture.This study revealed that the highest biomass production of Scenedesmus spinosus was obtained at pH 6.5 in the raceway photobioreactor,with a productivity of 371 g m-3 day-1,0.78%total solids,a turbidity of 858 NTU and 5%transmittance at the end of the culture. 展开更多
关键词 Microalgae photobioreactor biomass raceway tubular
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Microalgae:A potential alternative to health supplementation for humans 认领 引用 被引量：28
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作者 Apurav Krishna Koyande Kit Wayne Chew +3 位作者 Krishnamoorthy Rambabu Yang Tao Dinh-Toi Chu Pau-Loke Show 《Food Science and Human Wellness》 SCIE CAS 2019年第1期16-24,共9页
Microalgae has been consumed in human diet for thousands of years.It is an under-exploited crop for production of dietary foods.Microalgae cultivation does not compete with land and resources required for traditional ... Microalgae has been consumed in human diet for thousands of years.It is an under-exploited crop for production of dietary foods.Microalgae cultivation does not compete with land and resources required for traditional crops and has a superior yield compared to terrestrial crops.Its high protein content has exhibited a huge potential to meet the dietary requirements of growing population.Apart from being a source of protein,presence of various bio-active components in microalgae provide an added health benefit.This review describes various microalgal sources of proteins and other bio-active components.One of the heavily studied group of bio-active components are pigments due to their anticarcenogenic,antioxidative and antihypertensive properties.Compared to various plant and floral species,microalgae contain higher amounts of pigments.Microalgal derived proteins have complete Essential Amino Acids(EAA)profiles and their protein content is higher than conventional sources such as meat,poultry and dairy products.However,microalgal based functional foods have not flooded the market.The lack of awareness coupled with scarce incentives for producers result in under-exploitation of microalgal potential.Application of microalgal derived components as dietary and nutraceutical supplements is discussed comprehensively. 展开更多
关键词 Health Human Microalgae Protein Supplement
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A sustainable integration of removing CO2/NOx and producing biomass with high content of lipid/protein by microalgae 认领 引用 被引量：7
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作者 Junying Zhu Baowen Guo +4 位作者 Fengxiang Qie Xu Li Xikang Zhao Junfeng Rong Baoning Zong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第10期13-25,I0002,共13页
Due to the boost of CO2/NOxemissions which cause environmental pollution,processes that remove such pollutants from flue gas have attracted increasing attention in recent years.Among these technologies,biologica... Due to the boost of CO2/NOxemissions which cause environmental pollution,processes that remove such pollutants from flue gas have attracted increasing attention in recent years.Among these technologies,biological CO2/NOxemission reduction has received more interest.Microalgae,a kind of photosynthetic microorganism,offer great promise to convert CO2/NOxto biomass with high content of lipid and protein,which can be used as feedstock for various products such as biodiesel,health products,feedstuff and biomaterials.In this paper,biological CO2/NOxremoving technologies by microalgae,together with the products(such as biofuel and protein)and their economic viability are discussed.Although commercial applications of microalgae for biodiesel and protein products are hampered by the high production cost of biomass,the use of CO2/NOxfrom flue gas as carbon and nitrogen sources can reduce the cost of biomass production,which makes these technologies more competent for real-life applications.Moreover,it is projected that the increasing in CO2allowances will lead to further reduction in the cost of biomass production,which especially favors related products with lower values such as biodiesel.Furthermore,by combining various process optimization and integration,biorefinery is proposed and considered as the crucial component for the sustainable and economically feasible bulk applications of microalgae biomass. 展开更多
关键词 Microalgae Greenhouse gas NOx Biodiesel Protein
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Aqueous extracts of microalgae exhibit antioxidant and anticancer activities 认领 引用 被引量：11
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作者 Sanaa MM Shanab Soha SM Mostafa +1 位作者 Emad A Shalaby Ghada I Mahmoud 《Asian Pacific Journal of Tropical Biomedicine》 CAS 2012年第8期608-615,共8页
Objective:To investigate the antioxidant and anticancer activities of aqueous extracts of nine microalgal species.Methods:Variable percentages of major secondary metabolites(total phenolic content,terpenoids and alkal... Objective:To investigate the antioxidant and anticancer activities of aqueous extracts of nine microalgal species.Methods:Variable percentages of major secondary metabolites(total phenolic content,terpenoids and alkaloids) as well as phycobiliprotein pigments(phycocyanin, allophycocyanin and phycoerythrin) in the aqueous algal extracts were recorded.Antioxidant activity of the algal extracts was performed using 2,2 diphenyl-1-picrylhydrazyl(DPPH) test and 2,2'azino-bis(ethylbenzthiazoline-6-sulfonic acid(ABTS.) radical cation assay.Anticancer efficiency of the algal water extracts was investigated against Ehrlich Ascites Carcinoma cell(EACC) and Human hepatocellular cancer cell line(HepG2).Results:Antioxidant activity of the algal extracts was performed using DPPH test and ABTS.^+ radical cation assays which revealed 30.1-72.4%and 32.0-75.9%respectively.Anticancer efficiency of the algal water extracts was investigated against Ehdich Ascites Carcinoma Cell(EACC) and Human Hepatocellular cancer cell line(HepG2) with an activity ranged 87.25%and 89.4%respectively.Culturing the promising cyanobacteria species;Nostoc muscorum and Oscillatoria sp.under nitrogen stress conditions(increasing and decreasing nitrate content of the normal BG11 medium,1.5 g/L),increased nitrate concentration(3,6 and 9 g/L) led to a remarkable increase in phycobilin pigments followed by an increase in both antioxidant and anticancer activities in both cyanobacterial species.While the decreased nitrate concentration(0.75,0.37 and 0.0 g/L) induced an obvious decrease in phycobilin pigments with complete absence of allophycocyanin in case of Oscillatoria sp.Conclusions:Nitrogen starvation(0.00 g/L nitrate) induced an increase and comparable antioxidant and anticancer activities to those cultured in the highest nitrate content. 展开更多
关键词 Microalgae Antioxidant Anticancer Nitrogen starvation Cyanobacteria
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Fatty acid methyl ester profiles and nutritive values of 20 marine microalgae in Korea 认领 引用 被引量：5
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作者 Sung-Suk Suh So Jung Kim +4 位作者 Jinik Hwang Mirye Park Taek-Kyun Lee Eui-Joon Kil Sukchan Lee 《Asian Pacific Journal of Tropical Medicine》 SCIE CAS 2015年第3期191-196,共6页
Objecive:To screen the fatty acid(FA) composition of 20 marine microalgae species,including seven Diophyceae,six Bacillariophyeae four Chlorophyceae,two Haptophyceae and one Raphidophyceae species.Methods:Microalgal c... Objecive:To screen the fatty acid(FA) composition of 20 marine microalgae species,including seven Diophyceae,six Bacillariophyeae four Chlorophyceae,two Haptophyceae and one Raphidophyceae species.Methods:Microalgal cells cultured at the Korea Institute of Ocean Science & Technology were harvested during the late exponential growth phase and the FA composition analyzed.Results:The FA composition of microalgae was speciesspecific.For example,seven different species of Dinophyceae were composed primarily of C14:0,C16:0.C18:0.C20:4n-6.C20:5n-3 and C22:6n-3.while C14:0.C16:0,C16:1.C18:0.C20:5n-3 and C22:6n-3 were abundant FAs in six species of Bacillariophyceae.In addition,four Chlurophyceae,two Haptopkyeeae and one Raphidophyceae species all contained a high degree of C16:1 n-7[(9.2R-34.91)%and(34.48-35.04)%].C14:0[(13.34-25.96)%]and[(26.69-Z8.24)%],and C16:0[(5.89-29.15)%]and[(5.70-16.81)%].Several factors contribute to the nutritional value of microalgae.including the polyunsaturated FA content and n-3 to n-6 FA ratio,which could be used to assess the nutritional quality of microalgae.Conclusions:This study is the first comprehensive assessment of the FA composition and nutritional value of microalgae species in South Korea,and identifies the potential utility of FAs as species-specific biomarkers. 展开更多
关键词 Microalgae PUFA Nutritive values DHA EPA
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Research on KOH/La-Ba-Al_2O_3 catalysts for biodiesel production via transesterification from microalgae oil 认领 引用 被引量：6
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作者 Xiaoyu Zhang Qing Ma +3 位作者 Bibo Cheng Jun Wang Jinshan Li Fude Nie 《Journal of Natural Gas Chemistry》 CSCD 2012年第6期774-779,共6页
Alumina supports modified by lanthanum （La） and barium （Ba） were prepared by peptization. Catalysts with different KOH contents supported on modified alumina were prepared by impregnation method. Various technique... Alumina supports modified by lanthanum （La） and barium （Ba） were prepared by peptization. Catalysts with different KOH contents supported on modified alumina were prepared by impregnation method. Various techniques, including N2 adsorption-desorption （Brunauer-Emmet-Teller method, BET）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and fourier transform infrared absorption spectroscopy （FT-IR）. Catalytic activity for microalgae oil conversion to methyl ester via transesterification was evaluated and analyzed by GC-MS and GC. BET results showed that the support possessed high specific surface area, suitable pore volume and pore size distribution. Activity results indicated that the catalyst with 25 wt% KOH showed the best activity for microalgae oil conversion. XRD and SEM results revealed that Al-O-K compound was the active phase for microalgae oil conversion. The agglomeration and changing of pore structure should be the main reasons for the catalyst deactivation when KOH content was higher than 30 wt%. 展开更多
关键词 biodiesel microalgae oil La2O3 BaO solid catalyst
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Enhancing total fatty acids and arachidonic acid production by the red microalgae Porphyridium purpureum 认领 引用 被引量：5
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作者 Gaomin Su Kailin Jiao +6 位作者 Jingyu Chang Zheng Li Xiaoyi Guo Yong Sun Xianhai Zeng Yinghua Lu Lu Lin 《Bioresources and Bioprocessing》 EI 2016年第1期201-209,共9页
Objectives:This study investigated the effect of aeration rate and light intensity on biomass production and total fatty acids(TFA)accumulation by Porphyridium purpureum.The red microalgae is also known to accumulate ... Objectives:This study investigated the effect of aeration rate and light intensity on biomass production and total fatty acids(TFA)accumulation by Porphyridium purpureum.The red microalgae is also known to accumulate considerable amount of arachidonic acid(ARA).Results:In artificial seawater medium,the highest yield of TFA(473.44 mg/L)was obtained with the aeration rate of 3 L/min and light intensity of 165μmol/m2s,whilst the highest yield of ARA(115.47 mg/L)was achieved with the aeration rate of 3 L/min and light intensity of 110μmol/m2s.It was found that higher aeration rate led to more biomass and TFA/ARA production.However,higher light intensity could contribute to biomass accumulation,but it was adverse for TFA and ARA biosynthesis.Conclusion:By optimizing two operating factors(i.e.,light intensity and aeration rate),TFA and ARA production by P.purpureum was significantly improved.This research provides a potential alternative means for producing ARA. 展开更多
关键词 Microalgae Porphyridium purpureum Aeration rate Light intensity Total fatty acids Arachidonic acid
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Responses in growth, lipid accumulation,and fatty acid composition of four oleaginous microalgae to different nitrogen sources and concentrations 认领 引用 被引量：6
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作者 李涛 万凌琳 +1 位作者 李爱芬 张成武 《Chinese Journal of Oceanology and Limnology》 CSCD 2013年第6期1306-1314,共9页
Nitrogen deficiency is an effective strategy for enhancing lipid production in microalgae. Close relationships exist among lipid production, microalgal species, and nitrogen sources. We report growth, lipid accumulati... Nitrogen deficiency is an effective strategy for enhancing lipid production in microalgae. Close relationships exist among lipid production, microalgal species, and nitrogen sources. We report growth, lipid accumulation, and fatty acid composition in four microalgae （Chloroeoccum ellipsoideum UTEX972, Chlorococcum nivale LB2225, Chlorococcum tatrense UTEX2227, and Scenedesmus deserticola JNU19） under nitrate- and urea-nitrogen deficiencies. We found three patterns of response to nitrogen deficiency： Type-A （decrease in biomass and increase in lipid content）, Type-B （reduction in both biomass and lipid content）, and Type-C （enhancement of both biomass and lipid content）. Type-C microalgae are potential candidates for large-scale oil production. Chlorococcum ellipsoideum, for example, exhibited a neutral lipid production of up to 239.6 mg/（L＇d） under urea-nitrogen deficiency. In addition, nitrogen deficiency showed only a slight influence on lipid fractions and fatty acid composition. Our study provides useful information for further screening hyper-lipid microalgal strains for biofuel production. 展开更多
关键词 oleaginous microalgae nitrogen deficiency biomass total lipids fatty acid composition lipid classification
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Experimental studies on dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) production by four marine microalgae 认领 引用 被引量：4
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作者 LI Chengxuan YANG Guipeng +1 位作者 PAN Jinfen ZHANG Honghai 《Acta Oceanologica Sinica》 SCIE CAS 2010年第4期78-87,共10页
The production of dimethylsulfide （DMS） and dimethylsulfoniopropionate （DMSP） by marine microalgae was investigated to elucidate more on the role of marine phytoplankton in ocean-atmosphere interactions in the glo... The production of dimethylsulfide （DMS） and dimethylsulfoniopropionate （DMSP） by marine microalgae was investigated to elucidate more on the role of marine phytoplankton in ocean-atmosphere interactions in the global biogeochemical sulfur cycle.Axenic laboratory cultures of four marine microalgae–Isochrysis galbana 8701,Pavlova viridis,Platymonas sp.and Chlorella were tested for DMSP production and conversion into DMS.Among these four microalgae,Isochrysis galbana 8701 and Pavlova viridis are two species of Haptophyta,while Chlorella and Platymonas sp.belong to Chlorophyta.The results demonstrate that the four algae can produce various amounts of DMS（P）,and their DMS（P） production was species specific.With similar cell size,more DMS was released by Haptophyta than that by Chlorophyta.DMS and dissolved DMSP （DMSPd） concentrations in algal cultures varied significantly during their life cycles.The highest release of DMS appeared in the senescent period for all the four algae.Variations in DMSP concentrations were in strong compliance with variations in algal cell densities during the growing period.A highly significant correlation was observed between the DMS and DMSPd concentrations in algal cultures,and there was a time lag for the variation trend of the DMS concentrations as compared with that of the DMSPd.The consistency of variation patterns of DMS and DMSPd implies that the DMSPd produced by phytoplankton cells has a marked effect on the production of DMS.In the present study,the authors’ results specify the significant contribution of the marine phytoplankton to DMS（P） production and the importance of biological control of DMS concentrations in oceanic water. 展开更多
关键词 dimethylsulfide （DMS） dimethylsulfoniopropionate （DMSP） marine microalgae growth stages production
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Multistage defense response of microalgae exposed to pharmaceuticals in wastewater 认领 引用 被引量：2
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作者 Yuhao Chu Chaofan Zhang +3 位作者 Xi Chen Xue Li Nanqi Ren Shih-Hsin Ho 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第4期424-429,共6页
Recently, the use of microalgae for bioremediation of pharmaceuticals(Ph As) has attracted increasing interest. However, most studies focused more on microalgae removal performance, its defensive response to the Ph As... Recently, the use of microalgae for bioremediation of pharmaceuticals(Ph As) has attracted increasing interest. However, most studies focused more on microalgae removal performance, its defensive response to the Ph As during wastewater treatment remains unexplored. Herein, microalgal three defensive systems have been investigated in synthetic wastewater, with six Ph As as the typical drug. Results show that Ph As could bind to EPS, and this action in turn could help to alleviate the direct toxicity of Ph As to microalgae. Subsequently, the physiological analyses revealed the increase of superoxide dismutase(SOD), catalase(CAT), and peroxidase(POD) activities, potentially reducing the oxidative stress induced by Ph As. Furthermore, the enzyme activities of cytochrome P450(CYP450) and glutathione-S-transferase(GST) were significantly upregulated after exposure to SMX, CIP and BPA, followed by a significant decrease in biodegradation rates after the addition of CYP450 inhibitors, suggesting that the biotransformation and detoxification of Ph As occurred. Meanwhile, molecular docking further revealed that CYP450 could bind with Ph As via hydrogen bond and hydrophobic interaction, which proved their abilities to be metabolized and form transformation products in microalgae. These findings provide an advancing understanding of microalgae technologies to improve the treatment of wastewater contaminated with Ph As. 展开更多
关键词 Microalgae Pharmaceuticals Extracellular polymeric substances Antioxidant enzyme CYP450 enzyme
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Construction of algal-bacterial consortia using green microalgae Chlorella vulgaris and As(Ⅲ)-oxidizing bacteria:As tolerance and metabolomic profiling 认领 引用 被引量：2
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作者 Xiaoman He Guobing Lin +2 位作者 Jiayuan Zeng Zhaoguang Yang Lin Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第5期258-266,共9页
Bioremediation became a promising technology to resolve arsenic(As)contamination in aquatic environment.Since monoculture such as microalgae or bacteria was sensitive to environmental disturbance and vulnerable to con... Bioremediation became a promising technology to resolve arsenic(As)contamination in aquatic environment.Since monoculture such as microalgae or bacteria was sensitive to environmental disturbance and vulnerable to contamination,green microalgae Chlorella vulgaris and arsenite(As(Ⅲ))-oxidizing bacteria Pseudomonas sp.SMS11 were co-cultured to construct algal-bacterial consortia in the current study.The effects of algae-bacteria(A:B)ratio and exposure As(Ⅲ)concentration on algal growth,As speciation and metabolomic profile were investigated.Algal growth arrested when treated with 100 mg/L As(Ⅲ)without the co-cultured bacteria.By contrast,co-cultured with strain SMS11 significantly enhanced As tolerance in C.vulgaris especially with A:B ratio of 1:10.All the As(Ⅲ)in culture media of the consortia were oxidized into As(Ⅴ)on day 7.Methylation of As was observed on day 14.Over 1% and 0.5% of total As were converted into dimethylarsinic acid(DMA)after 21days cultivation when the initial concentrations of As(Ⅲ)were 1 and 10 mg/L,respectively.Metabolomic analysis was further performed to reveal the response of consortia metabolites to external As(Ⅲ).The enriched metabolomic pathways were associated with carbohydrate,amino acid and energy metabolisms.Tricarboxylic acid cycle and glyoxylate and dicarboxylate metabolism were upregulated under As stress due to their biological functions on alleviating oxidative stress and protecting cells.Both carbohydrate and amino acid metabolisms provided precursors and potential substrates for energy production and cell protection under abiotic stress.Alterations of the pathways relevant to carbohydrate or amino acid metabolism were triggered by energy requirement. 展开更多
关键词 Microalgae Algal-bacterial consortia As(Ⅲ)-oxidizing bacteria Metabolomics Energy metabolism
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