NIST Chemical Sciences Division, NIST Charleston Laboratory, 331 Fort Johnson Road, Charleston, SC, 29412, USA.
NIST Chemical Sciences Division, NIST Charleston Laboratory, 331 Fort Johnson Road, Charleston, SC, 29412, USA.
Talanta. 2021 Aug 15;231:122363. doi: 10.1016/j.talanta.2021.122363. Epub 2021 Mar 31.
Inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) was investigated for possible use in food fraud studies through the measurement of strontium and sulfur isotope ratios. Oxygen mass shift mode was applied to shift Sr/Sr and S/S isotope ratios to their respective oxides, SrO/SrO and SO/SO, effecting a gas-phase chemical separation of the elements from Rb and Kr (for Sr) and molecular N and O species, along with P- and S-hydrides (for S). A total least squares regression approach was employed to generate the isotope ratio data from time-resolved analyses, and method uncertainties and accuracies were determined. The utility of the approach was shown by using the Sr and S isotope ratios together to differentiate between NIST RM 8256 Wild-Caught Coho Salmon and NIST RM 8257 Aquacultured Coho Salmon. These materials are currently under development at NIST as certified food fraud standards and method evaluation materials for comprehensive chemical analysis.
电感耦合等离子体质谱串联质谱法 (ICP-MS/MS) 通过测量锶和硫同位素比值，被研究用于食品欺诈研究。氧质量位移模式被应用于将 Sr/Sr 和 S/S 同位素比值转移到它们各自的氧化物 SrO/SrO 和 SO/SO，从而实现元素与 Rb 和 Kr（对于 Sr）以及分子 N 和 O 物种，以及 P 和 S 氢化物（对于 S）的气相化学分离。采用全最小二乘回归方法从时间分辨分析中生成同位素比值数据，并确定方法的不确定度和准确度。该方法的实用性通过使用 Sr 和 S 同位素比值来区分 NIST RM 8256 野生捕获的银大麻哈鱼和 NIST RM 8257 水产养殖的银大麻哈鱼来证明。这些材料目前正在 NIST 作为经过认证的食品欺诈标准和综合化学分析的方法评估材料进行开发。
