Detection of Omethoate Residues in Peach with Surface-Enhanced Raman Spectroscopy
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Detection of Omethoate Residues in Peach with Surface-Enhanced Raman Spectroscopy Tehseen Yaseen 1,2,3 & Da-Wen Sun 1,2,3,4
&
Hongbin Pu 1,2,3 & Ting-Tiao Pan 1,2,3
Received: 22 October 2017 / Accepted: 13 March 2018 # Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract In this work, surface-enhanced Raman spectroscopy (SERS) was used with silver colloid substrate for rapid detection of omethoate (an organophosphate pesticide) in standard solution and peach extract. The findings demonstrated that the characteristic wavenumber of the pesticide could be precisely identified using the SERS method. The calibration curve was plotted between concentrations and Raman intensities of the target peak at 1649 cm−1 for the peach extract and at 1647 cm−1 for the standard solution. The coefficients of determination (R2) of 0.9829 and 0.98 were obtained for standard solution and for peach extract, respectively. The calculated limits of detection for omethoate in standard solution and in peach extracts were 0.001 mg L−1 and 0.01 mg kg−1, respectively. This study revealed that the proposed method could be used for the analysis of trace contaminants like omethoate in multifaceted food matrices. Keywords SERS . Residue detection . Omethoate . Substrate . Fruit
Introduction Organophosphosphate (OP) pesticides have been used extensively to increase the yield of agricultural products. They are the group of small molecules that exhibit poisonous characteristics for mites and insects, because of their action as acetylcholinesterase inhibitors (Costa 2006). Acetylcholinesterase is an enzyme responsible for catalyzing the breakdown of the neurotransmitter acetylcholine (Cocker et al. 2002). The inhibition of the enzyme allows for the accumulation of acetylcholine, producing the symptom associated with the central nervous system (anxiety, tremor, confusion, and dizziness) and the autonomous * Da-Wen Sun [email protected]; http://www.ucd.ie/refrig; http://www.ucd.ie/sun 1
School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, People’s Republic of China
2
Academy of Contemporary Food Engineering, Guangzhou Higher Education Mega Center, South China University of Technology, Guangzhou 510006, People’s Republic of China
3
Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
4
Food Refrigeration and Computerized Food Technology (FRCFT), Agriculture and Food Science Centre, University College Dublin, National University of Ireland, Belfield, Dublin 4, Ireland
nervous system (diarrhea, abdominal cramps, salivation, and nausea) (Delgado et al. 2004). Different studies have been reported that prolonged exposure to the OP may cause adverse neurobehavioral effects (Fan et al. 2014). Omethoate (O,O-dimethyl-S-methylcarbamoylmethylthiophosphate) is one of the acute organophosphorus insecticides (OPs), which is frequently employed in develo
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