Antityrosinase and Antimicrobial Activities of trans-Cinnamaldehyde Thiosemicarbazone
文献类型: 外文期刊
第一作者: Zhu, Yu-Jing
作者: Zhu, Yu-Jing;Liu, Bo;Zhu, Yu-Jing;Song, Kang-Kang;Li, Zhi-Cong;Pan, Zhi-Zhen;Guo, Yun-Ji;Zhou, Jing-Jing;Wang, Qin;Chen, Qing-Xi;Li, Zhi-Cong;Guo, Yun-Ji;Chen, Qing-Xi
作者机构:
关键词: Tyrosinase;trans-cinnamaldehyde thiosemicarbazone;antityrosinase activity;inhibition kinetics;antimicrobial activity
期刊名称:JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ( 影响因子:5.279; 五年影响因子:5.269 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Tyrosinase (EC 1.14.18.1) is a key enzyme in pigment biosynthesis of organisms. trans-Cinnamalde-hyde thiosemicarbazone, a derivative of benzaldehyde thiosemicarbazone, was synthesized as an inhibitor of tyrosinase. The inhibitory effects of this compound on the activity of mushroom tyrosinase were investigated. The results showed that trans-cinnamaldehyde thiosemicarbazone could potently inhibit both monophenolase activity and diphenolase activity of tyrosinase. For monophenolase activity, trans-cinnamaldehyde thiosemicarbazone could not only lengthen the lag time but also decrease the steady-state rate. For diphenolase activity, the IC_(50) value was determined to be 5.72 μM. Kinetic analyses showed that trans-cinnamaldehyde thiosemicarbazone was a reversible and mixed type inhibitor on this enzyme. The inhibition constants (K_I and K_(IS)) were determined to be 4.45 and 8.85 μM, respectively. Furthermore, the antibacterial activity against Bacillus subtilis, Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella pneumonia, and Agrobacterium tumefaciens was investigated. The results showed that trans-cinnamaldehyde thiosemicarbazone was more effective against B. subtilis and S. aureus with the same minimum inhibitory concentration (MIC) of 50 μg/mL and with the same minimum bactericidal concentration (MBC) of 50 μg/mL.
分类号: TQ
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