利用纳米金的表面等离子共振吸收光谱研究了谷胱甘肽(GSH)、L半胱氨酸(L-Cys)和6-巯基嘌呤(6-MP)3种巯基化合物与纳米金作用的机理.结果表明,3种巯基化合物均能诱导纳米金聚集导致其表面等离子共振吸收峰红移.聚集后的纳米金对介质环境(如溶液极性)的变化较敏感,其吸收峰随着加入分析物的极性变化有规律地红移,并且吸光度也线性下降.可根据波长的红移或吸光度变化确立定量关系,可望用于分析对象的定量检测.
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