Cutinases are hydrolytic enzymes which catalyzes esterification and trans-esterification reactions that make them highly potential industrial biocatalyst. In the present investigation microorganisms showing cutinase activity were isolated from plant samples. The strain showing maximum cutinase activity was identified by 18S rDNA sequencing as Aspergillus sp. RL2Ct and was selected for further studies. To achieve maximum enzyme production, the medium components affecting cutinase production were screened by Plackett-Burman followed by central composite design. The results obtained suggested that cutin, temperature and CaCl2 have influenced the cutinase production significantly with very high confidence levels. Cutinase production was maximum (663 U/mg protein) when using cutin prepared from orange peel as sole source of carbon. An overall 4.33-fold increase in the production of cutinase was observed after optimization of culture conditions (including 2.5-fold increase using RSM) during 24 h of incubation. The production time of Aspergillus sp. RL2Ct cutinase is significantly lower than the most of the earlier reported cutinase-producing fungus.

译文

角质酶是一种水解酶,可催化酯化和反式酯化反应,使其具有很高的工业生物催化剂潜力。在本研究中,从植物样品中分离出具有角质酶活性的微生物。通过18S rDNA测序将显示最大角质酶活性的菌株鉴定为曲霉属。RL2Ct并选择用于进一步研究。为了实现最大的酶产量,通过Plackett-Burman筛选了影响角质酶产量的培养基成分,然后进行了中央复合设计。获得的结果表明,角质,温度和CaCl2以很高的置信度显着影响了角质酶的产生。当使用从橙皮制备的角质作为唯一碳源时,角质酶产量最大 (663 U/mg蛋白质)。在培养24小时期间,在优化培养条件 (包括使用RSM增加2.5倍) 之后,观察到角质酶的产生总体增加了4.33倍。曲霉属 (Aspergillus sp. RL2Ct) 角质酶的生产时间明显低于早期报道的大多数角质酶生产真菌。

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