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Characterization of the squalene-rich Botryococcus braunii Abt02 strain

Journal of Oceanology and Limnology 2019年第2期37卷 675-684页

作者： CAO Min ZHANG Fangfang MAO Yunxiang KONG Fanna WANG Dongmei College of Marine Life Sciences Ocean University of China Qingdao 266003 China Key Laboratory of Marine Genetics and Breeding (OUC) Ministry of Education Qingdao 266003 China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and Technology Qingdao 266000 China

Botryococcus braunii is widely studied due to its high hydrocarbon content. In this study, B . braunii Abt02 was subjected to several analyses, including cytological observation, hydrocarbon composition analysis by gas chromatography mass spectrometry (GC-MS), phylogenetic identification using known races (A, B and L) of B . braunii strains based on their 18S rDNA sequences, and qPCR-based investigation of transcript accumulation levels of hydrocarbon biosynthesis-related enzymes (DXS, MCS, DLS, SQS) during diff erent growth phases (lag phase, log phase, early stationary growth phase, late stationary growth phase) under nitrogen-replete and nitrogen-depleted growth conditions, respectively. Based on cytological observation and on the 18S rDNA phylogenetic analysis, strain Abt02 was assigned to race B. Analysis of the strain’s chemical composition showed that the B . braunii Abt02 contained high levels of hydrocarbons, which accounted for 43.75% of the cell’s dry weight. Of these hydrocarbons, squalene and its derivatives accounted for up to 87.54%. In addition, all four enzymes investigated were expressed at higher levels during the log growth phase under nitrogen depleted conditions than under nitrogen replete conditions.

关键词： Botryococcus braunii cytological observation phylogenetic analysis hydrocarbon components qPCR

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Phytochemical screening and anticonvulsant studies of ethyl acetate fraction of Globimetula braunii on laboratory animals

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Asian Pacific Journal of Tropical Biomedicine 2014年第4期4卷 285-289页

作者： Musa Mumammad Aliyu Abdullahi Isma'il Musa Muhammad Ja'afar Kanial Magaji Garba Mohammed Department of Pharmaceutical and Medicinal Chemistry Ahmadu Bello University Department of Pharmaceutical and Medicinal Chemistry Usmanu Danfodio University Chemistry Advance Laboratory Sheda Science and Technology Complex Department of Pharmacology and Therapeutics Ahmadu Bello University

Objective:To investigate the phytochemical properties and the anticonvulsant potential of the ethyl acetate soluble fraction of ethanol leaf extract of Globimetida braunii,a plant used in ethnomedicine for the treatment of ***:The phytochemical screening was carried out using standard protocol while the anticonvulsant activity was studied using maximal electroshock test in chicks,pentylenetetrazole and 4-aminopyridine—induced seizures in ***:The preliminary phytochemical screening carried out on the crude ethanol extract revealed the presence of saponins,carbohydrates,flavonoids,tannins,anthraquinones and ***,tannins,flavonoids and steroids/terpenes were found to be present in the ethyl acetate fraction,In the pharmacological screening,150 mg/kg of the fraction protected 83.33%of animals against pentylenetetrazole-induced seizure in mice whereas sodium valproate a standard anti-epileptic drug offered 100%*** the 4-aminopyridine-induced seizure model,the fraction produced a significant(Pbraunii leaves extract possesses psychoactive compound that may be useful in the management of petit mal epilepsy and lend credence to the ethnomedical use of the plant in the management of epilepsy.

关键词： Epilepsy Globimetula braunii Seizure Medicinal Pentylenetetrazole

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The Effect of Media on Biomass and Oil Production in Botryococcus braunii Strains Kossou-4 and Overjuyo-3

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International Journal of Clean Coal and Energy 2015年第1期4卷 11-22页

作者： Khalid A. Al-Hothaly Aidyn Mouradov Abdulatif A. Mansur Brian H. May Andrew S. Ball Eric M. Adetutu School of Applied Sciences RMIT University Bundoora Australia Department of Biotechnology Faculty of Science Taif University Taif Kingdom of Saudi Arabia Department of Environmental and Natural Resources Engineering Faculty of Engineering Azawia University Azawia Libya School of Health Sciences RMIT University Bundoora Australia

The green algae Botryococcus braunii is widely recognized as a source of oil, including hydrocarbons. However, the slow rate of growth B. braunii hampers its commercial development. This stu- dy addresses this by examining the effects of three growth media on biomass and oil production in two B. braunii Race B strains, Kossou-4 and Overjuyo-3. Growth of B. braunii strains in BG11 medium resulted in significantly higher growth (2.3 - 4.2 and 2.9 - 6.0 fold increases in Kossou-4 and Overjuyo-3 respectively) compared to the JM and BBM-3N media after 15 days. A similar trend was obtained when biomass was measured indirectly using optical density (OD) and chlorophyll fluo-rescence. Oil production was also significantly higher in BG11 whether measured as oil weight or absorbance (ODs at 680 and 750 nm). However, the presence of extracellular oil was shown to in-crease absorbance values making OD measurements less reliable than dry weight assays. Maximum recovery of oil was recorded when hexane was used as solvent compared to hexane-isopro- panol and heptane. These results suggest that BG11 is the best growth medium for these two strains under the conditions of this experiment.

关键词： B. braunii Race B Media Biomass Oil Production

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Hexagonal Disk Structures Obtained during Carbonization of <i>Botryococcus braunii</i>Residues

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Journal of Materials Science and Chemical Engineering 2017年第2期5卷 22-34页

作者： Aohan Wang Mikihide Demura Makoto M. Watanabe Hiromasa Goto Division of Materials Science Faculty of Pure and Applied Sciences University of Tsukuba Tsukuba Japan Algae Biomass and Energy System R & D Center (ABES) University of Tsukuba Tsukuba Japan

In this study, we report a two-dimensional (2D) hexagonal disk obtained by carbonization of Botryococcus braunii (B. braunii) residues. Carbonization at 700℃followed by naturally cooling down to room temperature under a non-inert gas flow atmosphere affords to yield this unique structure. The 2D hexagonal disks consist of more than 52% carbon and more than 25% oxygen. Slight amount of Fe, silicon and magnesium would be the trigger of the formation of hexagonal structure. Treatment of biomass residue is a challenge in the near future accompanied by the achievement of new energy technology in the industrial level. This research points out that efficient use of discharged biomass residue could create a new avenue for material science. The morphology of obtained crystals carbonized in different conditions, especially with the existence of argon flow, was also investigated.

关键词： Hexagonal Disk Microalgae Residue Botryococcus braunii Carbonization Condition Crystal

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泥质烃源岩酸解有机质中两环倍半萜的检出及其意义

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东北石油大学学报 2018年第2期42卷 62-70,79页

作者：赵悦蔡进功杨燕雷天柱中国石油勘探开发研究院北京100083 同济大学海洋地质国家重点实验室上海200092 中国石油天然气集团公司冀东油田分公司河北唐山063004 中国科学院油气资源研究重点实验室甘肃兰州730000

以东营凹陷沙三下亚段和沙四上亚段主力烃源岩为研究对象,采用有机溶剂抽提—HCl酸解连续处理实验方法,对泥质烃源岩黏粒级组分的游离态有机质和碳酸盐矿物结合态有机质进行地球化学表征。结果表明:游离态有机质可以提供沉积环境、热成... 详细信息

以东营凹陷沙三下亚段和沙四上亚段主力烃源岩为研究对象,采用有机溶剂抽提—HCl酸解连续处理实验方法,对泥质烃源岩黏粒级组分的游离态有机质和碳酸盐矿物结合态有机质进行地球化学表征。结果表明:游离态有机质可以提供沉积环境、热成熟度、有机质生源等地化信息,碳酸盐矿物结合态有机质能补充有机质生源信息;碳酸盐矿物结合态有机质能更好地保存烃类组分的轻质端,可以指示Botryococcus braunii生源的两环倍半萜类生物标志化合物仅在赋存态中检出。此外单质硫具有相对较高的丰度,相对封闭的矿物晶格赋存环境使有机质的原生地质信息更好地保留下来。对烃源岩中游离态有机质和矿物结合态有机质的综合分析,可以得到更为真实客观的地质推断结果。

关键词：泥质烃源岩有机质赋存态游离态碳酸盐矿物结合态两环倍半萜 Botryococcus braunii 生源指示意义

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贴壁培养布朗葡萄藻净化工业废水的小试研究

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九江学院学报（自然科学版） 2016年第2期31卷 23-25,36页

作者：邓雅雄王艳汤明杨期勇程鹏飞九江市科技局科学技术交流服务中心九江学院电子商务学院九江学院鄱阳湖生态经济研究中心江西九江332005

随着传统化石燃料短缺和环境污染日趋严重,微藻因其繁殖快、含油量高、固碳效率高及易于与现代工业技术集成等优势成为近年来生物能源研究的热点。与其它微藻相比,布朗葡萄藻更多的是合成与传统化石原料更相近的烃类。因此,通过生物炼... 详细信息

随着传统化石燃料短缺和环境污染日趋严重,微藻因其繁殖快、含油量高、固碳效率高及易于与现代工业技术集成等优势成为近年来生物能源研究的热点。与其它微藻相比,布朗葡萄藻更多的是合成与传统化石原料更相近的烃类。因此,通过生物炼制制备的生物燃料与传统汽柴油更接近,更易于实现燃料替代。文章以布朗葡萄藻Botryococcus braunii SAG 807-1为主要研究对象,尝试了含钴废水进行葡萄藻贴壁培养的可行性。结果表明,含钴废水可用于葡萄藻Bbraunii SAG 807-1贴壁培养,并可以促进烃类的合成。

关键词：布朗葡萄藻Botryococcus braunii SAG 807-1 贴壁培养含钴废水

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