Salicylic acid(SA)is used as a preservative in food and a biocide in some consumer products.However,in some countries its use is prohibited.The main problem in the electroanalytical determination of SA is the formatio...Salicylic acid(SA)is used as a preservative in food and a biocide in some consumer products.However,in some countries its use is prohibited.The main problem in the electroanalytical determination of SA is the formation of a passive film during the electro-oxidation of SA.To alleviate the passivation during SA measurement,the experiment was conducted by screen-printed carbon electrode(SPCE).While,differential pulse voltammetry(DPV)was essential for oxidation process to provide better sensitivity.Under conditions of optimized pH and electrolyte concentration,we have calibrated SA in the range of 0.001-0.2 mM,with and LOD of 1.6μM.The relative standard deviation of the sensor responses to 40μM and 100μM SA(n=20)was<3%.SA recoveries in samples such as pickled green mustard,pickled bamboo shoots,pickled mango,pickled lime,pickle ginger and apple juice were found to be in the range of 84-113%.展开更多
基金support provided by Agricultural Research Development Agency(Grant no.CRP5507010820)the King Mongkut’s University of Technology Thonburi through the“KMUTT 55th Anniversary Commemorative Fund”(Grant number 60000331).
文摘Salicylic acid(SA)is used as a preservative in food and a biocide in some consumer products.However,in some countries its use is prohibited.The main problem in the electroanalytical determination of SA is the formation of a passive film during the electro-oxidation of SA.To alleviate the passivation during SA measurement,the experiment was conducted by screen-printed carbon electrode(SPCE).While,differential pulse voltammetry(DPV)was essential for oxidation process to provide better sensitivity.Under conditions of optimized pH and electrolyte concentration,we have calibrated SA in the range of 0.001-0.2 mM,with and LOD of 1.6μM.The relative standard deviation of the sensor responses to 40μM and 100μM SA(n=20)was<3%.SA recoveries in samples such as pickled green mustard,pickled bamboo shoots,pickled mango,pickled lime,pickle ginger and apple juice were found to be in the range of 84-113%.
