Development of Optical Chemical Sensor Based on Pararosaniline in Sol-Gel Matrix for Detection of Formaldehyde in Food Samples
- 1 Chemo and Biosensors Group, Faculty of Pharmacy, Jember University, Jember, Indonesia
- 2 Faculty of Pharmacy, Airlangga University, Surabaya, Indonesia
- 3 Chemo and Biosensors Group, Faculty of Pharmacy, Jember University, Jember, Indonesia
Abstract
Optical chemical sensor based on immobil esed pararosaniline into sol-gel matrix tetraethyl orthosilicate (TEOS) is a simple tool that can be used to detect the presence of formalin (formaldehide) in food. Pararosaline in sol-gel matrix was develop ed when contact ed with food sample that contain s formalin. The optical signal was produced by chang ing color from purple to yellow , that can be used to detec t quantitative formal dehide in sample . The result s , chemo sensor optic , ha ve characteristic, maximum wave length 576.42 nm, with linier range 0 - 100 ppm, linearity coefficient R 2 = 0.999, limit detection (LOD) 0.504 ppm, limit of quantification (LOQ) 1.68 0 ppm, sensitivity 0.087, disturbed matrix selectivity 1.71 6 % . The optimum is operational at pH 4 , and response time at 150 seconds of 2 ppm . This sensor can be used to detect formal in in food sample in a simple mode and reusable for 4 times ap p lication. In addition, the sensor can be regenerated using an
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