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

Yutaka Abe; Tomoyuki Abe; Hiroyuki Ohno; Kimiyasu Ohashi; Asako Ozaki; Takamitsu Kazama; Yohei Kataoka; Kumi Suzuki; Shinichiro Nagai; Kotaro Hanazawa; Masato Hayakawa; Naoyuki Hirabayashi; Miku Yamaguchi; Kazunari Watanabe; Motoh Mutsuga; Kyoko Sato

doi:10.3358/shokueishi.63.97

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

Shokuhin Eiseigaku Zasshi. 2022;63(2):97-103. doi: 10.3358/shokueishi.63.97.

[Article in Japanese]

Authors

Affiliations

¹ National Institute of Health Sciences.
² Japan Food Hygiene Association.
³ Nagoya City Public Health Research Institute.
⁴ Japan Recreation and Miscellaneous Goods Safety Laboratory.
⁵ Osaka Institute of Public Health.
⁶ Tama Laboratory, Japan Food Research Laboratories.
⁷ Tokyo Metropolitan Institute of Public Health.
⁸ Tokyo Kenbikyo-in.
⁹ Japan Inspection Association of Food and Food Industry Environment.
¹⁰ High Polymer Test & Evaluation Center, Osaka Office, Japan Chemical Innovation and Inspection Institute.
¹¹ Hatano Research Institute, Food and Drug Safety Center.
¹² High Polymer Test & Evaluation Center, Tokyo Office, Japan Chemical Innovation and Inspection Institute.

PMID: 35650035
DOI: 10.3358/shokueishi.63.97

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 (RSD_R) which was estimated from the interlaboratory study, and predicted RSD_R 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.

Keywords: inter-laboratory study; kitchen detergent; methanol.

MeSH terms

Detergents*
Laboratories
Methanol*
Reproducibility of Results

Substances

Detergents
Methanol