Integrated Science and Technology (Applied Chemistry/Environmental Management and Software Engineering) Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket 83120, Thailand; Trace Analysis and Biosensor Research Center, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand; Center of Excellence on Hazardous Substance Management (HSM), Bangkok 10330, Thailand.
Integrated Science and Technology (Applied Chemistry/Environmental Management and Software Engineering) Research Center, Faculty of Technology and Environment, Prince of Songkla University, Phuket Campus, Kathu, Phuket 83120, Thailand.
Food Chem. 2018 May 30;249:154-161. doi: 10.1016/j.foodchem.2018.01.021. Epub 2018 Jan 3.
A biodegradable colorimetric film was fabricated on the lid of portable tube for in-tube formaldehyde detection. Based on the entrapment of colorimetric reagents within a thin film of tapioca starch, the yellow reaction product was observed with formaldehyde. Intensity of the blue channel from the digital image of yellow product showed a linear relationship in the range of 0-25 mg L with low detection limit of 0.7 ± 0.1 mg L. Inter-day precision of 0.61-3.10%RSD were obtained with less than 4.2% relative error from control samples. The developed method was applied for various food samples in Phuket and formaldehyde concentration range was non-detectable to 1.413 mg kg. The quantified concentrations of formaldehyde in fish and squid samples provided relative errors of -7.7% and +10.8% compared to spectrophotometry. This low cost sensor (∼0.04 USD/test) with digital image colorimetry was thus an effective alternative for formaldehyde detection in food sample.
一种可生物降解的比色膜被制备在便携式管的盖子上，用于管内甲醛检测。基于显色试剂被包埋在木薯淀粉的薄膜内，黄色反应产物与甲醛一起被观察到。黄色产物的数字图像的蓝色通道强度在 0-25mg/L 范围内呈线性关系，检测限低至 0.7±0.1mg/L。从控制样品中获得的日内精密度为 0.61-3.10%RSD，相对误差小于 4.2%。所开发的方法应用于普吉岛的各种食品样品，甲醛浓度范围为未检出至 1.413mg/kg。与分光光度法相比，鱼和鱿鱼样品中甲醛的定量浓度提供了-7.7%和+10.8%的相对误差。因此，这种低成本传感器（每个测试约 0.04 美元）与数字图像比色法是食品样品中甲醛检测的有效替代方法。
