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用非水溶性聚乙烯吡咯烷酮（ｉｎｓｏｌｕｂｌｅＰＶＰ）对标准氨基酸混合液和红色牡丹花朵样品的７５％乙醇沸水浴浸提液进行脱色处理，结果表明，非水溶性聚乙烯吡咯烷酮不吸收氨基酸，氨基酸回收率为９７．４％～１００．６％．对样品浸提液的脱色完全，１７种标准氨基酸均被检出，且杂质峰少。
Water-insoluble polyvinylpyrrolidone (insolublePVP) of standard amino acid mixture and red peony flowers 75% ethanol boiling water bath bleaching decolorization results showed that non-water-soluble polyvinylpyrrolidone does not absorb amino acids, amino acid recovery rate 97.4% ~ 100.6%. Complete decoloration of the sample extract, 17 kinds of standard amino acids were detected, and fewer impurity peaks.