Culture of Scenedesmus acuminatus in Corn Steep Liquor

Microalgae have been evaluated as a source of lipids for biodiesel production. They can be grown on effluent and produce biomass while removing organic and mineral components from the medium. The use of agro-industrial wastes for the production of microalgae is an alternative to reduce the costs related to the composition of the culture medium, thus reducing operational costs considerably. This work was conceived as a research about the cultivation of microalgae Scenedesmus acuminatus on the substrate composed by corn steep liquor. A central composite design （CCD） was carried to study the influence of the effluent and inoculum concentration on the chemical oxygen demand （COD） of the culture. Statistical analysis indicated that the percentage of inoculum and effluent had an influence on the COD. The cultivation, together with the coagulation procedure, was efficient for the removal of organic matter, verified through the COD reduction and changing of pH value. These two parameters reached the appropriate level according to the standard required by current legislation.

细菌L-乳酸发酵培养基的优化

利用热葡糖苷酶芽胞杆菌(Geobacillus thermoglucosidasius)TL-4厌氧发酵生产L-乳酸,为降低L-乳酸生产成本,以农产品及副产物为主要原料,通过单因子试验确定了TL-4产L-乳酸的碳源及氮源,并运用正交试验对摇瓶发酵不同氮源的组合进行了研究,确定了发酵培养基中影响产酸的主要因子及配比。优化发酵培养基为葡萄糖160g/L,小肽发酵液10g/L,玉米浆5g/L,摇瓶发酵L-乳酸产量可达152.5g/L。

植酸钠水解制取肌醇新工艺研究

开发了用离子交换树脂吸附法以玉米浸渍水为原料制得的植酸钠，再进行加压水解制取肌醇的新工艺。通过正交试验确定了最佳工艺条件，肌醇的平均收率达到0．16％，产品质量达到国家药典标准。

利用玉米浸泡液生产活性干酵母的研究

采用玉米浸泡液作为原料,利用其中的碳源、氮源、无机盐等营养物质发酵生产活性干酵母。探索并优化其发酵条件,结果表明:最佳发酵条件为,玉米浸泡液浓度为14.00%,培养基pH为5.5,初始加入的葡萄糖为200.00 mg/mL,接种量为1.20%,发酵时间为46 h,得到的干酵母产量达到最高17.80 mg/mL,而且细胞存活率为96.40%。