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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (8): 1258-1264. 上一篇    下一篇

研究论文

过渡金属离子与明胶相互作用的研究

唐世华;黄建滨   

  1. 北京大学物理化学研究所.北京(100871)
  • 发布日期:2001-08-15

Study on the interaction of gelatin with transition metal ions

Tang Shihua;Huang Jianbin   

  1. Beijing Univ, Inst Phys Chem.Beijing(100871)
  • Published:2001-08-15

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被引次数

8 | 2

利用荧光猝灭法，研究了pH值10.0，不同温度下，Mn^2+,Co^2+,Ni^2+,Hg^2+与明胶的相互作用。计算了猝灭常数、螯合平衡常数和结合位点数。紫外光谱和显微红外光谱的测定结果表明，Mn^2+,Co^2+,Ni^2+与明胶分子中的酰胺键发生了作用。确定了猝灭机理。计算得出的热力学函数表明，在Mn^2+,Co^2+,Ni^2+对明胶荧光的猝灭过程中，熵效应起着重要的作用。

关键词: 金属离子, 热力学函数, 螯合物, 明胶, 相互作用, 荧光猝灭, 过渡金属化合物

The interaction of gelatin with Mn^2+,Co^2+,Ni^2+ and Hg^2+ ions were investiged at different temperatures by fluorescence quenching method. The quenching constants, chelate equilibrium constants, binding sites and the thermodynamic functions are calculated.The results of micro- IR and UV show that Co^2+,Mn^2+and Ni^2+ interact with the amido bond in gelatin molecule. The entropy change is a main factor in the flurescence queching process of gelatin by Co^2+, Mn^2+ and Ni^2+.

Key words: METAL ION, THERMODYNAMIC FUNCTION, CHELATES, GELATIN, INTERACTIONS, TRANSITION METAL COMPOUND

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