Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 2-Amino-4,5-dihydrothiazole-4-carboxylic acid, is researched, Molecular C4H6N2O2S, CAS is 2150-55-2, about Optimization of bioconversion conditions for manufacturing L-cysteine from DL-2-amino-Δ2-thiazoline-4-carboxylic acid with immobilized cells based on response surface analysis.Quality Control of 2-Amino-4,5-dihydrothiazole-4-carboxylic acid.
The conversion conditions for manufacturing L-cysteine using immobilized cells were optimized by using SAS software combined with the methods of Plackett-Burman design and response surface methodol. The cells were immobilized by calcium alginate embedding method. The optimum levels of three important factors were determined as follows: the volume of immobilized cell was 25.5 mL, the concentration of DL-2-amino-Δ2-thiazoline-4-carboxylic acid (DL-ATC) was 1.0 mass%, and the proliferation time of immobilized cells was 12.9 h. Experiments showed that the average enzyme activity could reach 934 U/mL at optimized conditions for five batches, with an increase of 38.9% compared with that before the optimization. After the immobilized cells were utilized for 4 times, the conversion rate could be still over 91.0% of the initial value.
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