色谱2012，Vol.30Issue(7)：743-746,4.DOI:10.3724/SP.J.1123.2012.02040
顶空进样-气相色谱法检测乳制品中硫氰酸盐的含量
Determination of thiocyanate in dairy products by headspace gas chromatography
摘要
Abstract
A method for the determination of thiocyanate in dairy products by headspace gas chromatography was established. At first, the thiocyanate in dairy products was extracted by water. Then, the zinc acetate solution was added to the crude product for protein precipitation. The extract obtained above was centrifuged and the supernatant was added with chloramine T, which derivatized the thiocyanate ions to cyanogen chloride. The head-space vapor of the final extract was injected into a BP10 (14% cyanopropyl phenyl polysiloxane) gas chromato-graphic column, and detected by an electron capture detector (ECD). The target compound was quantified by external standard. The results showed that there was a good linearity between 0. 005 mg/L and 0. 1 mg/L with the correlation coefficient (r) of 0. 997, and the limit of detection (signal-to-noise ratio(S/N) 2sl0)was 0. 1 mg/kg. The recoveries were 90.0% -110. 0% with the relative standard deviations ( RSDs) (n = 10) of 4. 98% - 7. 89% at the three spiked levels of 1. 0, 2. 0, 10. 0 mg/kg. In conclusion, this method is simple, rapid and accurate. It can be applied in the determination of thiocyanate in dairy products, and meets the requirements of the daily testing. The method has been successfully used to test 18 kinds of commercially available dairy products and it was found that all the dairy products tested contained thiocyanate about 0. 5 - 10 mg/kg.关键词
顶空气相色谱法/硫氰酸盐/乳制品Key words
headspace gas chromatography/thiocyanate/dairy products分类
化学化工引用本文复制引用
宋洁,傅英文,杜利君,姚亚婷,穆夏洁,康利华,赵悠悠..顶空进样-气相色谱法检测乳制品中硫氰酸盐的含量[J].色谱,2012,30(7):743-746,4.基金项目
出入境行业标准制定项目(2009B526). （2009B526）
