Elencovan, Vasagee
(2022)
Application Of Green Silicone
Surfactant In Microextraction Of
Organophosphorus Pesticides In Food
Samples.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
Organophosphorus pesticides (OPPs) are phosphate chemicals that have been
extensively applied in field crops to get rid of pests and insects. The repeated
consumption of OPPs in agriculture, lead to their presence at trace quantity in food
products and thus, there is a growing demand for the identification and quantification
of OPPs. Therefore, this study aims to explore the application of a novel green nonionic
silicone surfactant (SS) in the development of various extraction techniques for
the determination of OPPs in food samples. Firstly, the SS has been explored as an
emulsifier in vortex assisted liquid-liquid microextraction (SS-VALLME) for the
determination of OPPs in food samples with the aid of gas chromatography-mass
spectrometry (GC-MS). SS facilitates the emulsification of extraction solvent into the
aqueous matrix solution thus enhancing the partitioning of target OPPs into the
extraction phase. Under the optimum conditions, the limit of detection (LODs) of the
proposed method were in the range of 0.008 − 0.1 μgL-1 while good determination
coefficients (R2) varied from 0.9989 to 0.9994 were obtained. Application of the
developed method gave acceptable relative recovery of OPPs (80 − 118%) from food
samples. Next, the green SS was further explored by combining with dodecanoic acid
(DoAc) to produce deep eutectic solvent (DES) in which the SS acts as a hydrogen
bond acceptor (HBA) while the DoAc acts as a hydrogen bond donor (HBD). The
newly synthesized SS:DoAc based DES was applied in VALLME as an emulsifier.
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