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Circular dichroism study of chiral biomolecules conjugated with silver nanoparticles

机译：银纳米粒子与手性生物分子的圆二色性研究

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摘要

Chiral biomolecules conjugated with silver nanoparticles were investigated by circular dichroism (CD) spectroscopy. Silver nanoparticles were prepared by the citrate reduction method and were characterized by UV spectroscopy and TEM. Conjugation of thiol group-containing biomolecules, such as cysteine, glutathione and penicillamine, with silver nanoparticles resulted in the generation of new characteristic CD signals in the region of 240-400 nm, whereas no CD signal changes were found with lysine or glutamine. Association through hydrogen bonding among the biomolecules is considered to be essential for CD signal generation, which was confirmed by experiment with cysteine methyl ester. Interestingly, Au nanoparticles were not found to generate CD signals in the wavelength region tested, indicating that this phenomenon is a unique feature of silver nanoparticles, distinguished from gold nanoparticles.
机译：通过圆二色性（CD）光谱研究了与银纳米颗粒共轭的手性生物分子。通过柠檬酸盐还原法制备银纳米颗粒，并通过紫外光谱和TEM对其进行表征。含巯基的生物分子（例如半胱氨酸，谷胱甘肽和青霉胺）与银纳米颗粒的缀合导致在240-400 nm范围内产生新的特征CD信号，而赖氨酸或谷氨酰胺未发现CD信号变化。生物分子之间通过氢键缔合被认为是CD信号产生所必需的，半胱氨酸甲酯的实验证实了这一点。有趣的是，未发现Au纳米粒子在测试的波长区域内产生CD信号，表明该现象是与金纳米粒子不同的银纳米粒子的独特特征。

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