【摘要】 目的 :考察用紫外吸收碘量法快速测定体液维生素C的可行性。方法 :用碘乙酸封闭巯基 ,三氯乙酸沉淀蛋白质 ,二氯甲烷抽提除去干扰色素。测定处理后体液样品与碘反应 30s前后 35 3nm吸收变化。结果 :测定反应前或后的光吸收变异<5 % ,反应前后光吸收变化同体系VC含量成正比 ,响应曲线斜率与三碘复合物的消光系数接近 ,样品中VC回收率 >90 % ,可测定反应体系 5～ 30 μmol/L的VC。 结论 :本方法有望用于体液VC的快速测定。更多还原

【Abstract】 Objective:To investigate the feasibility of fast assay of vitamin C (VC) in body fluids by iodometry with UV absorbance detection.Methods:The sample was pretreated with iodoacetic acid to block sulfhydryl group.Protein was precipitated by trichloroacetic acid,and chromogen was extracted with chloromethylene.The change of absorbance after 30 s reaction of the pretreated sample with iodine was measured.Results:The assay of absorbance before and after 30 s reaction of the pretreated sample with iodine showed the variation coefficient within 5%,and the recovery of VC was above 90%.There was linear response of the absorbance change to the amount of VC from body fluids with slope consistent to that for iodine.Conclusion:This method may be desirable for fast assay of VC in body fluids.更多还原