姜黄素
酪蛋白
化学
分子动力学
荧光
荧光光谱法
生物利用度
猝灭(荧光)
结合常数
疏水效应
核化学
结晶学
分析化学(期刊)
物理化学
结合位点
色谱法
有机化学
计算化学
生物化学
物理
生物
量子力学
生物信息学
作者
Ruichen Zhao,Xiaoli Qin,Jinfeng Zhong
出处
期刊:Molecules
[MDPI AG]
日期:2021-08-22
卷期号:26 (16): 5092-5092
被引量:10
标识
DOI:10.3390/molecules26165092
摘要
Effect of temperature and pH on the interaction of curcumin with β-casein was explored by fluorescence spectroscopy, ultraviolet-visible spectroscopy and molecular dynamics simulation. The spectroscopic results showed that curcumin could bind to β-casein to form a complex which was driven mainly by electrostatic interaction. The intrinsic fluorescence of β-casein was quenched by curcumin through static quenching mechanism. The binding constants of curcumin to β-casein were 6.48 × 104 L/mol (298 K), 6.17 × 104 L/mol (305 K) and 5.73 × 104 L/mol (312 K) at pH 2.0, which was greater than that (3.98 × 104 L/mol at 298 K, 3.90 × 104 L/mol at 305 K and 3.41 × 104 L/mol at 312 K) at pH 7.4. Molecular docking study showed that binding energy of β-casein-curcumin complex at pH 2.0 (−7.53 kcal/mol) was lower than that at pH 7.4 (−7.01 kcal/mol). The molecular dynamics simulation study showed that the binding energy (−131.07 kJ/mol) of β-casein-curcumin complex was relatively low at pH 2.0 and 298 K. α-Helix content in β-casein was decreased and random coil content was increased in the presence of curcumin. These results can promote a deep understanding of interaction between curcumin and β-casein and provide a reference for improving the bioavailability of curcumin.
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