Analytical Sciences

A Multiple Processing Hybrid Flow System for Analysis of Formaldehyde Contamination in Food

Saowapak TEERASONG,*1 Natchanon AMORNTHAMMARONG,*2 Kate GRUDPAN,*3 Norio TESHIMA,*4 Tadao SAKAI,*4 Duangjai NACAPRICHA,*5 and Nuanlaor RATANAWIMARNWONG*6

*1 Institute for Innovative Learning, Mahidol University, Phuttamonthon 4 Road, Nakhon Pathom 73170, Thailand
*2 National Oceanic & Atmospheric Administration (NOAA), Ocean Chemistry Division/AOML, 4301 Rickenbacker Causeway, Miami, FL 33149, USA
*3 Department of Chemistry, Faculty of Science, Chiang Mai University, Huay Kaew Road, Chiang Mai 50200, Thailand
*4 Department of Applied Chemistry, Aichi Institute of Technology, Yakusa, Toyota 470-0392, Japan
*5 Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand
*6 Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23 Road, Bangkok 10110, Thailand

This work proposes a flow system suitable for the rapid screening of formaldehyde contaminated in food. The system is based on the concept of a flow analyzer with a Hantzsch reaction. An operating procedure was developed for multiple tasking and high sample throughput. This resulted in a significant sample throughput of 51 samples h⁻¹. Under the optimized conditions, linear calibration from 10 to 100 μM was obtained. The system gave a limit of detection and a limit of quantitation of 0.06 and 0.10 mg kg⁻¹, respectively. The system was successfully applied to re-hydrated dry squids, vegetables and mushrooms.

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