%0 Journal Article
%T Hydroxylation of 16α, 17α-epoxy-4-pregenene-3,20-dione by Absidia coerulea with Pseudo-crystallo Feed<br>拟结晶投料环氧黄体酮犁头霉羟化过程研究
%A WANG Jia
%A GUAN Yi-Xin
%A WANG Hai-Qing
%A YAO Shan-Jing
%A <br>王嘉
%A 关怡新
%A 王海清
%A 姚善泾
%J 生物工程学报
%D 2006
%I 
%X The 11-hydroxylation of 16alpha,17alpha-epoxy-4-pregenene-3,20-dione as a useful intermediate for the preparation of hormones can be achieved by the mycelium of Absidia coerulea at higher conversion rate than using other strains. In this paper 16alpha,17alpha-epoxy-4-pregenene-3,20-dione mixed with a little water, beta-cyclodextrin, Tween-80 was introduced into the fermentation broth after ultrasonication to increase pseudo-water-solubility of the hydrophobic substrate. This pseudo-crystallo feed could avoid the toxicity of organic solvents and was more available for the microbial transformation. The multi layer feed-forward neural network was used to setup a model which indicated the relationship between medium and feed components and the conversion rate. Particle swarm optimization (PSO), which was a stochastic global optimization algorithm and of which the convergence speed was high, was applied to obtain the optimal concentration of the medium and feed components. At optimum conditions with the pseudo-crystallo feed, the conversion rate of 16alpha,17alpha-epoxy-4-pregenene-3,20-dione at an initial concentration of 10 g/L was 87.5% in shaking flasks. The conversion rate of the substrate was up to 86.6% at higher concentration of 20 g/L feed in a 3.7 L fermentor.
%K 犁头霉
%K 环氧黄体酮
%K 拟结晶投料
%K 羟化反应
%K 粒子群优化算法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=A66E90C274451689E69F6F0291467824&aid=05B58706E06CD989&yid=37904DC365DD7266&vid=BC12EA701C895178&iid=E158A972A605785F&sid=A0C7970CD30381EA&eid=1C3BB0F444F5E427&journal_id=1000-3061&journal_name=生物工程学报&referenced_num=0&reference_num=10