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The mechanism of the interaction between Sr(II) and bovine serum albumin (BSA) in aqueous solution was investigated using xylenol orange (XO) as a probe by UV–Vis absorption and fluorescence spectroscopy. Binding ratios of nSr(II):nXO = 1:1 and nSr(II):nXO:nBSA = 1:1:1 (pH 7.4) were confirmed. Static quenching occurred between Sr(II)-XO and BSA because of hydrophobic force. Based on the Förster theory...
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