Citation:
LI Lei, LIU Xue-Feng, FANG Yun, ZOU Zhu-Yan. Interference of Coexisting Substances in Esculetin-Bovine Serum Albumin Binding Process[J]. Chinese Journal of Applied Chemistry,
;2008, 25(1): 106-110.
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The interference,caused by 6 kinds of coexisting substances,in esculetin-bovine serum albumin(BSA) binding process was investigated for the first time by means of CD,UV-Vis and fluorescence spectroscopy.The parameters such as KP,KA,n and r were obtained.The detailed interferential quomodo of the coexisting substances were concluded.With I-,r decreased in the range of 0.3%~2.7%,and KP and KA increased in the range of 5.9%~8.1%,and 11.5%~20.6%,respectively;moreover,n increased from 1.58±0.04 to 1.74±0.25,and ion-bridge was the possible interferential quomodo of I-.Sodium Benzoate decreasd r in the range of 2.4%~4.5%,increased KP in the range of 3.9%~6.9%,and decreased KA in the range of 1.9%~3.4%,while n decreased from 1.58±0.04 to 0.92±0.16,which suggested that appositional replacement was sodium benzoate's interferential quomodo.SDS increased r in the range of 1.2%~2.8%,decreased KP and KA in the range of 11.4%~12.2% and 27.5%~27.8%,respectively,and decreased n from 1.58±0.04 to 1.06±0.12.TW80 decreased r and KA in the range of 1.2%~2.4% and 10.0%~20.1%,respectively,and decreased KP in the range of 4.7%~4.9%,and decreased n from 1.58±0.04 to 1.00±0.27.SDS and TW80 probably interfered by destroying the binding site(s).As for TW80,appositional replacement was another probable interferential quomodo.In addition CD results showed that BSA molecular conformational transition caused by the coexisting substances-BSA binding was a common interferential quomodo of the coexisting substances.Furthermore,it was the main interferential quomodo of glucose and VC,too.
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