LIU Bao-sheng, YAN Xiao-na, CAO Shi-na, CHONG Bao-hong, LV Yun-kai. Interaction of Cefpiramide Sodium with Bovine Serum Albumin and The Effect of Coexistent Metal Ion on The Reaction[J]. Chinese Journal of Luminescence, 2012,33(9): 1018-1024
LIU Bao-sheng, YAN Xiao-na, CAO Shi-na, CHONG Bao-hong, LV Yun-kai. Interaction of Cefpiramide Sodium with Bovine Serum Albumin and The Effect of Coexistent Metal Ion on The Reaction[J]. Chinese Journal of Luminescence, 2012,33(9): 1018-1024 DOI: 10.3788/fgxb20123309.1018.
Interaction of Cefpiramide Sodium with Bovine Serum Albumin and The Effect of Coexistent Metal Ion on The Reaction
The interaction between bovine serum albumin (BSA) and cefpiramide sodium (CPMS) was investigated at different temperatures. The effect of common metal ions (Mg
2+
Zn
2+
Cu
2+
Co
2+
Fe
3+
Ni
2+
) on the BSA-CPMS system was also researched. The results show that CPMS can quench the intrinsic fluorescence of BSA significantly
and the quenching mechanism is a static quenching process which follows the Förester spectroscopy energy transfer. The electrostatic force played an important role on the conjugation reaction between BSA and CPMS. The binding constants (
K
a
) was in the order of 10
4
and the number of binding site (
n
) in the binary system was approximately equal to 1. The binding distance (
r
) was about 2.60 nm and the primary binding for CPMS was located at sub-domainⅡA of BSA. Synchronous spectra and Circular dichroism(CD) spectra revealed that the microenvironment and the conformation of BSA were changed during the conjugation reaction.
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references
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