植酸与金属离子络合的研究

Complexation of phytic acid with metal ions

植酸络合金属离子可用于抑制酶促褐变和非酶褐变的发生,因而在食品工业表现出潜在的应用前景。应用量子化学EHT方法研究了植酸对钙、镁、铜、钴、镍金属离子的络合性能。络合结构分析表明,植酸与金属离子形成络合物的稳定性和配体分子轨道与金属轨道耦合程度有关;植酸对金属离子络合能力来自于其分子中磷酸基团的富电子性。

Phytic acid shows potential application in food industry because of its complexation property with metal ions, which can be used in preventing enzymatic browning and non - enzymatic browning reaction. An analysis of the bonding of phytic acid to Ca^2＋ , Mg^2＋ , Cu^2＋ , Co^2＋ and Ni^2＋ was performed by using a quantum chemistry EHT method. The structural comparison of the studied complexes indicated that their stabilities were related to the extent of coupling between molecular orbit and metal orbit. The complexible ability of phytic acid to metal ions was considered to be originated from the electron rich property of its phosphoric acid group.