高效液相色谱法测定虾肉及虾制品中吲哚含量
HPLC Determination of Indole in Shrimp Meat and Its Products
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摘要: 称取适量鲜虾肉或虾肉干,用乙腈(20 mL)提取2次,离心分离后取其上清液,用乙腈定容至50.0 mL,供高效液相色谱分析。加入2-甲基吲哚作为内标,所用色谱柱为Hedera ODS-2柱,流动相为乙腈-水(65+35)混合液,用荧光检测器检测(λex=270 nm,λem=340 nm)洗脱液中吲哚含量。标准曲线的线性范围在200 μg·L-1 以内,方法的测定下限(10S/N)为125 μg·kg-1。以空白样品作基体,用标准加入法进行回收试验,测得回收率在90.1%~104%之间,测定值的相对标准偏差(n=6)在1.9%~5.2%之间。Abstract: Appropriate amount of sample of fresh shrimp meat (or dried shrimp meat) was taken and extracted twice with acetonitrile (20 mL). After centrifuging, the supernatants were taken and made up to 50.0 mL with acetonitrile, and used for HPLC analysis. 2-Methyl-indole was added as internal standard. The Hedera ODS-2 column and mobile phase of mixture of acetonitrile and H2O (65+35) were used for HPLC separation. Fluorescence detection (λex=270 nm, λem=340 nm) was adopted for the determination. Linearity range was found within 200 μg·L-1 of indole. Lower limit of determination (10S/N) was found as 125 μg·kg-1. Test for recovery was made by addition of standard indole solution to blank samples of fresh and dry shrimp meat as matrixes, and values of recovery found were in the range of 90.1%-104% with values of RSD′s (n=6) in the range of 1.9%-5.2%.