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荧光猝灭法研究8-烷基黄连碱衍生物对溶菌酶的作用机制

Xiao-fei JIANG, Bao-shun ZHANG,Yong LIU,Xue-gang LI

Journal of Hunan Agricultural University（2011）

Cited 5|Views9
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Abstract
通过测定不同温度(12、24、36℃)下8-烷基黄连碱衍生物(Cop-C8-n,n=4、6、8)对溶菌酶的荧光猝灭常数,并计算热力学参数,研究8-烷基黄连碱衍生物对溶菌酶的作用机制.结果表明:8-烷基黄连碱衍生物对溶菌酶的内源性荧光可产生极强的猝灭作用,猝灭作用过程既有静态猝灭又有动态猝灭;热力学参数证明,黄连碱衍生物与溶菌酶的结合作用力主要为疏水作用力,随着烷基链的增长,溶菌酶的紫外吸收逐渐下降;在荧光分析中,24℃下溶菌酶与Cop-C8-8的结合位点为2,结合常数为2.063×107,都显著高于Cop-C8-6和Cop-C8-4.
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Key words
8-alkyl coptisine derivatives, lysozyme, fluorescence quenching
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