在pH值为2.5～4.0的BR缓冲溶液介质中,牛血清白蛋白(BSA)、糜蛋白酶(Chy)和α-淀粉酶(α-Amy)等蛋白质与酸性多糖硫酸软骨素A(CS)形成结合物. 此时将会使共振瑞利散射(RRS)和二级散射(SOS)、倍频散射(FDS)等共振非线性散射的强度显著增大. 在蛋白质过量时,3种散射增强(ΔIRRS、ΔISOS和ΔIFDS)均在一定范围内与CS的浓度成正比,方法具有高灵敏度. 当用Chy、BSA和α-Amy作探针时,3种散射法对于CS的检出限分别在1.4～5.8 μg/L、2.0～13.2 μg/L和1.8～9.6 μg/L. 其中以Chy-CS体系的RRS法最灵敏(检出限1.4 μg/L),可用于痕量CS的测定. 研究了反应体系的RRS、SOS和FDS的光谱特征、适宜的反应条件和影响因素,并以Chy-CS体系为例考察了共存物质的影响,方法有良好的选择性,将其用于滴眼液中CS的测定,取得了较好的结果.
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