研究了三种儿茶素（（+）-C,（–）-EC,EGCG）对碱的缓冲能力,Al3+对儿茶素缓冲能力的影响及EGCG与Al3+的络合作用。结果表明,儿茶素溶液对碱有较强的缓冲能力,酯型儿茶素更强,EGCG约是EC或者C的两倍;在儿茶素与Al3+络合过程中,儿茶素的紫外–可见吸收在274βnm处逐渐下降,而322βnm处逐渐升高;EGCG与Al3+的络合度为1:1。
In this paper, reactions of catechins chelating with Al3+ were studied. The results showed that, catechins have strong buffer abilities to OH–, and EGCG’s is stronger than that of E or EC, After adding Al3+ to catechin solution, its pH value decreased and absorbance at 274βnm went down and at 322βnm went up. The ratio of EGCG-Al in the complex is 1:1.
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