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首页> 外文期刊>CHROMATOGRAPHY >Facile and Accurate Analysis of Sodium Dehydroacetate in Cosmetic Powders After Extraction by Na2CO3-Methanol-H2O and Derivatization with 4-Nitrophenylhydrazine?HCl
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Facile and Accurate Analysis of Sodium Dehydroacetate in Cosmetic Powders After Extraction by Na2CO3-Methanol-H2O and Derivatization with 4-Nitrophenylhydrazine?HCl

机译：Na 2 CO 3 -甲醇-H 2 O萃取并用4-硝基苯肼衍生化后的化妆品粉末中脱氢乙酸钠的简便准确分析盐酸

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摘要

Sodium dehydroacetate (SDA) was extracted from cosmetic powders using a Na_(2)CO_(3)-methanol-H_(2)O system. After the extract was neutralized, the resulting dehydroacetic acid (DAA) reacted with 4-nitrophenylhydrazine?HCl (4-NPH?HCl) to give the corresponding hydrazone, which was determined by an HPLC-VIS (400 nm) system. Using 4-NPH?HCl in great excess was suitable for detecting the presence of DAA, which almost reacted with the hydrazine to yield the corresponding hydrazone. As a result, it was determined that contaminants in the cosmetic powder did not interfere with analysis of the hydrazone. Importantly, the molar absorptivity of the hydrazone (1.29 × 10~(4) at 400 nm) is five times that of DAA (2.57 × 10~(3) at 230 nm). Accordingly, detection of the hydrazone at 400 nm in a new analytical method might have fivefold higher sensitivity compared with that of DAA at 230 nm in the standard method.
机译：使用Na_（2）CO_（3）-甲醇-H_（2）O系统从化妆品粉末中提取脱氢乙酸钠（SDA）。中和萃取液后，将所得的脱氢乙酸（DAA）与4-硝基苯基肼→HCl（4-NPH→HCl）反应，得到相应的，用-VIS（400nm）系统测定。使用过量的4-NPH 2 HCl适合检测DAA的存在，DAA几乎与肼反应生成相应的。结果，确定了化妆粉中的污染物不干扰the的分析。重要的是，hydr的摩尔吸收率（400 nm时为1.29×10〜（4））是DAA的摩尔吸收率（230 nm时为2.57×10〜（3））。因此，在新的分析方法中检测at在400 nm处的灵敏度可能是在标准方法中在230 nm处检测DAA的灵敏度的五倍。

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