螺旋藻粉生物质回收稀土元素Yb(Ⅲ):吸附等温线、动力学和热力学

研究以螺旋藻粉作为吸附剂从废水溶液中回收Yb(Ⅲ)的吸附特性和机理.利用SEM和XPS对吸附剂的表面结构以及元素价态进行分析,探究螺旋藻粉对Yb(Ⅲ)的吸附机理;通过吸附等温线、动力学和热力学模型分析螺旋藻粉对Yb(Ⅲ)的吸附特性.Langmuir模型表明,当温度为318 K时,螺旋藻粉对Yb(Ⅲ)的最大吸附量为72....     

螺旋藻脱腥工艺优化及其强化米粉的研制

利用发酵法对螺旋藻进行脱腥,以藻蓝蛋白的吸光值来判定脱腥程度,通过响应面分析确定脱腥工艺最佳参数为:39℃水浴加热30 min,酵母添加量为0.84%;在米粉生产中加入1%的脱腥螺旋藻可得没有腥味的营养强化米粉。结果表明,脱腥螺旋藻米粉营养强化效果明显,其中VE增加了500%、VC增加了380%、钙增加了294%、铁增加了77%、锌增加了67%、蛋白质增加了20%、脂肪增加了10%。     

戊二醛交联改性螺旋藻及其吸附Cr~(6+)的试验研究

利用戊二醛对螺旋藻进行交联改性制备新型吸附剂吸附Cr6+研究。采用正交试验法对戊二醛改性螺旋藻吸附Cr6+的改性条件进行研究,结果显示:各因素对改性藻吸附Cr6+的影响由大到小的顺序为:戊二醛质量分数>初始pH值>改性时间>藻类投加量,最佳试验条件为:戊二醛质量分数为6%,初始pH值为1,藻类投加量为0.5 g,改性时间为4 h。对原藻和改性后的藻吸附能力进行对比研究,结果显示:室温下对于100 mL Cr6+的质量浓度为80 mg/L的溶液,在藻的投加量为0.4 g、pH值为3时吸附效果最好。原藻和改性藻的Langmuir动力学方程的最大吸附量分别可达到7 889.5、14 424.5μg/g。     

螺旋藻食品质量安全现状与分析

螺旋藻作为一种天然的营养保健食品,含有丰富的优质蛋白以及多种生物活性成分,得到了消费者的认可和信赖。但近期发生的螺旋藻保健品中重金属铅含量超标引起了消费者的恐慌,同时也给螺旋藻行业以及保健食品行业敲响了警钟。为此,本综述从螺旋藻铅超标对人体造成的危害、事件背后引起的反思以及应对措施3个角度进行了探讨。     

Spirulina: A source of dietary gamma-linolenic acid?

Spirulina powders obtained from different commercial sources contained 23.6–38.0 mg g^?1 DM as long-chain fatty acids and 3.4–6.0 mg g^?1 DM as y-linolenic acid (6, 9, 12-octadecatrienoic acid). However, γ-linolenic acid constituted up to 40% of the total fatty acids within the isolated galactolipids. Unesterified fatty acids accounted for 8.4–66.9% of the fatty acids recovered from the different samples; the remaining fatty acids were in glycerolipids. There was also a wide variation in the contents of photosynthetic pigments among the different preparations. Spirulina was four-fold more expensive than evening primrose oil as a source of a-linolenic acid to supplement human diets. Since α-linolenic acid (9, 12, 15-octadecatrienoic acid), (E)-3 hexa-decenoate, 3-sn-phosphatidylcholineand 3-sn-phosphatidyl ethanol-amine were not detected in the lipid extracts, none of the samples was significantly adulterated by eucaryotic algae. From an analysis of the extracted lipids it was possible to make some predictions both about the manner in which the cells were cultured and the post-harvest treatment of the preparations.     

Photobiological Production of Hydrogen from Spirulina for Fueling Fuel Cells

Abstract

Natural resources of the world are shrinking day by day with ever increasing population and man's growing need for commercialization of petroleum, natural gas, coal, etc. Therefore, there is a need for finding an alternative fuel that could replace these conventional fuels. Hydrogen seems to be an ideal candidate, since hydrogen is a cleaner source of energy. Fuel cell is a good device that converts hydrogen directly into electrical energy efficiently. However, availability of hydrogen is a problem. There are many conventional methods for producing hydrogen, like thermochemical process, catalytic reforming of hydrocarbons, and electrolysis of water, but these methods are not economical and are mostly non-renewable. Biological means of producing hydrogen offers a renewable source of hydrogen production. Cyanobacteria can split water into hydrogen. Anabaena sp. is found to produce more hydrogen than other species of cyanobacteria; however, if this has to be cultured only for hydrogen production, it may not be commercially viable. Spirulina sp. has a good food value and can produce hydrogen as a byproduct. In order to reduce the cost of the fuel cell, the platinum anode may be replaced by a carbon electrode impregnated with suitable inexpensive metal that may have good catalytic activity such as Co-Al oxide spinel and nickel. Studies towards the photobiological production of hydrogen were undertaken. Hydrogen based fuel cell was assembled and fabricated and these studies are being reported.     

螺旋藻的营养价值及在生物资源回收中的应用

螺旋藻是一种极富营养价值与药用价值的微藻 ,并且在生物资源的处理与回收中有着特殊的作用。近年来人们越来越关注如何在污水处理、废气处理等过程中充分利用和培养螺旋藻。     

Transient analysis and performance studies of two tubular photobioreactors for outdoor culture of spirulina

A mathematical model to make a transient thermal analysis and to estimate the incident solar energy for two designs of tubular photobioreactor installed outdoors is presented here. In the first photobioreactor design the tubes were arranged in one plane, whereas in the second the tubes were arranged in two planes. The model was validated by comparing the experimental data and predicted values of culture temperature. Both the input solar energy and culture temperature in a tubular photobioreactor may be predicted with a reasonable degree of accuracy by employing the model. The performance of the two photobioreactors for mass culture of Spirulina was also studied in relation to their design and culture temperature. The average biomass yield obtained in one-plane and two-plane photobioreactors were (dry weight) 23.7 g m^?2 day^?1 and 27.8 g m^?2 day^?1 respectively. Such biomass yields corresponded to a volumetric productivity of (dry weight) 0.466 g litre^?1 day^?1 in the one-plane reactor and 1.5 g litre^?1 day^?1 in the two-plane reactor. We further observed that biomass yield could be increased by about 21% when the culture temperature was maintained at the optimal value of 35°C compared to another culture in which temperature changed according to the ambient temperature from 20 to 39°C during the day.     

螺旋藻藻蓝蛋白在碳酸饮料中的稳定性研究

采用羟基磷灰石层析的方法从钝顶螺旋藻分离得到藻蓝蛋白,藻蓝蛋白在碳酸饮料中的稳定性研究表明:碳酸饮料中的藻蓝蛋白在低温,弱光,高蛋白浓度,短时间保存条件下稳定性最好.多因素分析表明,对碳酸饮料中藻蓝蛋白稳定性影响的强弱顺序为:温度>保存时间>光强.