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Biosorption potential of cerium ions using spirulina biomass

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Journal of Rare Earths 2016年第6期34卷 644-652页

作者： David Sadovsky Asher Brenner Boaz Astrachan Boaz Asaf Raphael Gonen Unit of Environmental Engineering Faculty of Engineering SciencesBen-Gurion University of the NegevP.O.B 653Beer-Sheva8410501Israel Nu-clear Research Center Negev P.O.B 9001Beer-Sheva84190Israel

Two types of cyanobacteria of the genus Arthrospira（commonly known as spirulina） were tested for biosorption of cerium（III） ions from aqueous solutions. An endemic type（ES） found in the northern Negev desert, Israel, and a commercial powder（CS） were used in this study. Biosorption was evaluated as a function of p H, contact time, initial metal concentration, number of sorption-desorption cycles, and salt concentration. The optimum p H range for biosorption was found to be 5.0–5.5. The kinetic characteristics of both spirulina types were found to be highly compatible with a pseudo-second order kinetic model. The adsorption isotherms of both types were found to be well-suited to Langmuir and Freundlich adsorption isotherms. Maximum biosorption uptakes, according to the Langmuir model, were 18.1 and 38.2 mg/g, for ES and CS, respectively. Sodium chloride concentrations of up to 5 g/L had a minor effect on cerium biosorption. Desorption efficiency was found to be greater than 97% with 0.1 mol/L HNO_3 after three sorption-desorption cycles, without significant loss in the biosorption capacity. The results indicated the feasibility of cerium recovery from industrial wastes using spirulina biomass.

关键词： biosorption cerium Arthrospira spirulina kinetics isotherms rare earths

Novel Approaches of Using of spirulina Platensis in Natural Rubber Based Composites

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Journal of Renewable Materials 2018年第7期6卷 680-687页

作者： Ewa Głowińska Janusz Datta Paulina Parcheta and Natalia Kaźmierczak Department of Polymers Technology Gdańsk University of TechnologyNarutowicza Street 11/1280-233 GdańskPoland

The aim of this work was to investigate the influence of spirulina (spirulina platensis) as a natural filler on thecuring characterization, morphology and mechanical, thermomechanical and thermal properties of naturalrubber (NR) based composites. spirulina was introduced into NR mixture in amount of 0 phr, 10 phr and 30 *** vulcanization process was carried out at the determined process condition by using hydraulic press atoptimum vulcanization time (t90). It was noticed that spirulina affected on the reduction of t90, and scorch time(t2) of the NR mixtures. Obtained vulcanizates were subjected to the number of tests e.g. scanning electronmicroscopy analysis, mechanical dynamical analysis, tensile test, hardness, and thermogravimetry. Generally, itwas found that spirulina added in amount of 10 phr NR positively influenced on tensile strength (TSb), storagemodulus and hardness of obtained composites.

关键词： spirulina algae natural rubber composites DMA

A new model of phycobilisome in spirulina platensis

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Science China(Life Sciences) 1999年第1期42卷 74-79页

作者：张玉忠陈秀兰周百成曾呈奎刘洁时东霞庞世瑾 1. Institute of Oceanology Chinese Academy of Sciences 266071 Qingdao China 2. State Key Laboratory of Microbial Technology Shandong University 250100 Jinan China 3. Beijing Laboratory of Vacuum Physics Chinese Academy of Sciences 100080 Beijing China

Phycobilisomes (PBS) were isolated from blue-green alga spirulina platensis. Scanning tunneling microscope was used to investigate the three-dimensional structure of PBS deposited on freshly cleaved highly oriented py-rolytic graphite (HOPG) in ambient condition at room temperature. The results showed that the rods of PBS radiated from the core to different directions in the space other than arrayed in one plane, which was different from the typical hemi-discoidal model structure. The diameter of PBS was up to 70 nm, and the rod was approximately 50 nm in length. Similar results were observed in Langmuir-Blodgett (LB) film of PBS. The dissociated PBS could reaggregate into rod-like structures and easily form two-dimensional membrane while being absorbed on HOPG, however, no intact PBS was observed. The filling-space model structure of PBS in spirulina platensis with STM from three-dimensional real space at nanometer scale was found, which showed that this new structural model of PBS surely exists in blue-green algae and red algae. The function of this structural model of PBS was also discussed.

关键词： spirulina platensis phycobilisomes scanning tunneling microscope.

EFFECT OF GERMANIUM DIOXIDE ON GROWTH OF spirulina PLATENSIS

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Chinese Journal of Oceanology and Limnology 1996年第4期14卷 378-381页

作者：曹吉祥 Fisheries College Ocean University of Qingdao Qingdao 266003

This study on the effect of different concentrations of germanium dioxide （GeO2） on the specificgrowth rate （SGR）, pigment contents, protein content and amino acid composition of spirulina platensisshowed that Ge was not the essential element of this alga; that GeO2 could speed up growth and raiseprotein content of S. platensis, and could possibly influence the photosynthesis system. The concentrationrange of GeO2 beneficial to growth of S. platensis is from 5-100 mg/l. GeO2 is proposed to be util-ized to remove contamination by Chlorella spp. usually occurring in the cultivation of spirulina.

关键词： spirulina platensis growth germanium dioxide

Tolerance Comparison Among Selected spirulina Strains Cultured Under High Carbon Dioxide and Coal Power Plant Flue Gas Supplements

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Journal of Ocean University of China 2021年第6期20卷 1567-1577页

作者： ZHAO Qianqian JIN Guiyong LIU Qiuke PAN Kehou ZHU Baohua LI Yun Key Laboratory of Mariculture of Ministry of Education Ocean University of ChinaQingdao 266003China Function Laboratory for Marine Fisheries Science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266037China

In order to explore the changes in the growth and protein contents of spirulina and obtain a proper strain for the fixation of carbon dioxide(CO2 from flue gas,the strains isolated from the spirulina farms and the strain 208 were cultured under different aeration conditions including no CO2,10%CO2 and coal power plant flue gas *** physiological indexes including filament length,biomass yield and chlorophyll a,soluble protein and phycocyanin contents were determined,*** cultured without CO2 supplement,the strain 4-5 exhibited the highest biomass yield(1.880 g L^(−1)and a specific growth rate(0.367 d−***,the specific growth rate of all strains decreased significantly when they were cultured under 10%CO2 and unfiltered coal power plant flue gas *** differences were noted in the performance of the experimental microalgal strains under different contemporaneous *** strain 7-8 achieved the highest biomass yield(1.603 g L^(−1)and relatively high phycocyanin content(7.1%)under 10%CO2 *** noted that strain 4-5 had the highest specific growth rate(0.182 d−1 and biomass yield(0.43 g L^(−1)under coal power plant flue gas *** 6-10 displayed the highest soluble protein content(66.02%),and strain 7-8 showed the highest phycocyanin content(9.28%)under coal power plant flue gas supplement.

关键词： spirulina CO2 coal power plant flue gas physiological index

Cytotoxic effect of spirulina platensis extracts on human acute leukemia Kasumi-1 and chronic myelogenous leukemia K-562 cell lines

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Asian Pacific Journal of Tropical Biomedicine 2017年第1期7卷 14-19页

作者： Flor Yohana Flores Hernandez Sanghamitra Khandual Inocencia Guadalupe Ramírez López Center for Investigation and Assistance in Technology Design for State of JaliscoC.P.45019ZapopanJaliscoMexico

Objective: To evaluate the cytotoxic effects of spirulina platensis extracts on acute leukemia Kasumi-1 and chronic leukemia K-562 cancer cell ***: Various concentrations of spirulina platensis extracts(0.25–50.00 mg/m L)obtained with different solvents were used to treat cell lines for 72 h. For cytotoxic effect studies, cell viability test with trypan blue solution, MTT assay and microscopic cytomorphological assessment were ***: spirulina extract obtained with 70% ethanol showed significant cytotoxicity in K562 and Kasumi-1 cell lines. With trypan blue solution, IC_(50) values were found to be4.64 mg/m L for K-562 and 3.68 mg/m L for Kusumi-1 cell lines. spirulina aqueous extract also showed cytotoxicity with trypan blue method, at a slightly higher dose; where IC_(50) values were 12.68 mg/m L for K-562 and 2.13 mg/m L for Kusumi-1 cell lines. The IC_(50) values were found 0.40 mg/m L for K-562 and 0.31 mg/m L for Kusumi-1 cell lines for the 70% ethanol extract according to the MTT assay. spirulina extract obtained with water also showed cytotoxicity but the dose was a little higher where IC_(50) values were15.77 mg/m L for K-562 and 9.44 mg/m L for Kusumi-1 cell lines. The effect of cytotoxicity with ethanol extract is quite comparable with that observed for cyclophosphamide, which is a chemical used as anticancer ***: The cytotoxicity exhibited by spirulina extract to cancer cell lines might be due to the presence of phytopigments(carotenoids, chlorophyll, phycocyanin) as well as polysaccharides that were reported previously as constituents of the extract. So crude extracts of spirulina can be used as a source to develop anticancer drugs.

关键词： Leukemia Cytotoxicity spirulina Carotenoids

Bioremediation potential of spirulina:toxicity and biosorption studies of lead

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2005年第3期6卷 171-174页

作者：陈红潘珊珊 Department of Environmental Engineering Zhejiang University Hangzhou 310013 China

This study examines the possibility of using live spirulina to biologically remove aqueous lead of low concentration (below 50 mg/L) from wastewater. The spirulina cells were first immersed for seven days in five wastewater samples containing lead of different concentrations, and the growth rate was determined by light at wavelength of 560 nm. The 72 h-EC50 (72 h medium effective concentration) was estimated to be 11.46 mg/L (lead). Afterwards, the lead adsorption by live spirulina cells was conducted. It was observed that at the initial stage (0–12 min) the adsorption rate was so rapid that 74% of the metal was bio- logically adsorbed. The maximum biosorption capacity of live spirulina was estimated to be 0.62 mg lead per 105 alga cells.

关键词： Bioadsorption Bioremediation spirulina Lead

Inf luence of spirulina platensis exudates on the endocrine and nervous systems of a mammalian model

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Asian Pacific Journal of Tropical Biomedicine 2015年第6期5卷 449-455页

作者： Samah Mamdouh Mohamed Fathy Ashraf Mohamed Mohamed Essa Zoology Department Faculty of Science Fayoum University Biology Department Faculty of Science Jazan University Botany Department Faculty of Science Fayoum University

Objective: To investigate the ef ect of intra-peritoneal injection of purii ed exudates of axenic spirulina platensis on the mammalian endocrine and nervous systems. Methods: The intra-peritoneal injection of the cyanobacterial exudates in mice was applied. Sex hormonal levels of testosterone and progesterone were measured using radioimmunoassay while the follicular stimulating hormone and luteinizing hormone were evaluated by direct chemiluminescence. In addition, superoxide dismutase, catalase and glutathione peroxidase were monitored in the hippocampus region using spectrophotometric method. The levels of the hippocampal monoamines, dopamine, noradrenaline and serotonin were analyzed by high performance liquid chromatography while the acetyl choline neurotransmitter was measured by colorimetric method using choline/acetylcholine assay kit. Results: A sharp disruption in the sex hormones levels of testosterone, progesterone, follicular stimulating hormone and luteinizing hormone was demonstrated in the serum of the treated mice. At the same time, a signii cant reduction in the endogenous antioxidant defense enzymes, superoxide dismutase, catalase and glutathione peroxidase was observed in the hippocampus region of the injected mice. Moreover, levels of dopamine, noradrenaline, serotonin and acetyl choline neurotransmitter in the same region were signii cantly af ected as a result of the treatment with spirulina i ltrate. The gas chromatography-mass spectrometer and liquid chromatography mass spectrometry/mass spectrometry analysis showed the presence of some sterol-like compounds in the cyanobacterial i ltrate. Conclusions: This study demonstrated the capability of spirulina to release detrimental bioactive metabolites into their surrounding that can disrupt the mammalian endocrine and nervous systems.

关键词： spirulina platensis Sterol-like compounds Sex hormones Antioxidant enzymes Neurotransmitters

Construction of energy transfer model of C-phycocyanin and allophycocyanin from spirulina platensis

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Chinese Science Bulletin 1997年第1期42卷 69-72页

作者： Wang, GC Zhou, BC Zeng, CK Experimental Marine Biology Laboratory Institute of Oceanology Chinese Academy of Sciences Qingdao China

PHYCOBILIPROTEINS. which include phycoerythrin, phycocyanin, phycoerythroeyanin and allophycocyanin, are intensively coloured, highly fluorescent, water soluble chromoproteins. They are composed of at least two dissimilar polypeptides, α and β subunits, in a molar ratio of 1:1. The subunits possess linear tetrapyrrole prosthetic groups covalently linked to the primary structure via cysteine thioether linkages. In blue-green and red algae, phycobiliproteins occur in a supramolecular structure, the phycobilisome, located on the surface of thylakoid to

关键词： spirulina platensis C-phycocyanin allophycocyanin covalent conjugate energy transfer.