[Inter-laboratory Study on the Modified Method Assessment for the Determining Methanol Content in Kitchen Detergents].

IF 0.2 4区农林科学 Q4 FOOD SCIENCE & TECHNOLOGY Food Hygiene and Safety Science Pub Date : 2022-04-25 DOI:10.3358/shokueishi.63.97

Yutaka Abe, T. Abe, H. Ohno, Kimiyasu Ohashi, A. Ozaki, Takamitsu Kazama, Yohei Kataoka, Kumi Suzuki, Shinichiro Nagai, Kotaro Hanazawa, Masato Hayakawa, Naoyuki Hirabayashi, Miku Yamaguchi, Kazunari Watanabe, M. Mutsuga, Kyoko Sato

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Abstract

We modified a method for determining methanol content in detergents used in kitchens. Furthermore, an inter-laboratory study was conducted in 10 laboratories to validate the modified method. In this study, two concentrations of samples were blindly coded. Each laboratory determined the methanol content in each sample according to a protocol. The determined values were statistically analyzed according to an international harmonized guideline. HorRat values were calculated based on the reproducibility relative standard deviation (RSDR) which was estimated from the interlaboratory study, and predicted RSDR calculated from the Horwitz/Thompson equation. The HorRat values of the two samples were 0.8 and 1.8, meeting the performance criteria of less than 2 set by the Codex Alimentarius for analytical method approval. These results confirm that this modified analytical method shows good performance as an analytical method for determining methanol content in kitchen detergents.

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[厨房洗涤剂中甲醇含量测定改进方法评价的实验室间研究]。

我们改进了一种测定厨房用洗涤剂中甲醇含量的方法。此外，在10个实验室进行了实验室间研究，以验证改进的方法。在本研究中，两个浓度的样本被盲目编码。每个实验室根据协议确定每个样品中的甲醇含量。根据国际统一准则对测定值进行统计分析。HorRat值根据实验室间研究估计的重复性相对标准偏差(RSDR)计算，并根据Horwitz/Thompson方程预测RSDR。两种样品的HorRat值分别为0.8和1.8，符合食品法典规定的小于2的分析方法批准性能标准。结果表明，改进后的分析方法可作为厨房洗涤剂中甲醇含量的分析方法。

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