Development of analytical method for determination of thiosultap-disodium residue in palm oil matrix

Nik Sasha Khatrina Khairuddin, . and Farah Khuwailah Ahmad Bustamam, . and Meng Guan Tay, . and Chee Beng Yeoh, . and Najwa Sulaiman, . and Mei Huey Saw, . Development of analytical method for determination of thiosultap-disodium residue in palm oil matrix. pp. 634-640. ISSN 1511-2780

Thiosultap-disodium (thiosultap) has been identified to be the potential alternative to monocrotophos and methamidophos for controlling bagworms and leaf earting caterpillars infestation in oil palm plantations. This article reports a simple and fast method of determining thiosultap residue in palm oil matrix using liquid chromatography coupled to a triple quadrupole mass spectrometer. The proposed method has been inhouse validated . Method recoveries were found to be satisfactory within the range of 72 to 103 method precision was good with a relative standard deviation (RSD) of 4 to 6 for repeatability and RSD of less than 12 for intermediate precision. Method limit of detection and determination were estimated from matrix matched calibration curves the values were 2.9 ng ml- and 8.7 ng ml- respectively. The fact that no maximum residue limit has been set for thiosultap in palm oil internationally suggesting that the default value of 0.01 mg kg- maximum allowable limit is to be enforced. An analytical method that will enable the determination of thiosultap residue at this default level therefore is required to facilitate the monitoring of potential thiosultap residue contamination in palm oil traded in Malaysia.

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Abstract

Thiosultap-disodium (thiosultap) has been identified to be the potential alternative to monocrotophos and methamidophos for controlling bagworms and leaf earting caterpillars infestation in oil palm plantations. This article reports a simple and fast method of determining thiosultap residue in palm oil matrix using liquid chromatography coupled to a triple quadrupole mass spectrometer. The proposed method has been inhouse validated . Method recoveries were found to be satisfactory within the range of 72 to 103 method precision was good with a relative standard deviation (RSD) of 4 to 6 for repeatability and RSD of less than 12 for intermediate precision. Method limit of detection and determination were estimated from matrix matched calibration curves the values were 2.9 ng ml- and 8.7 ng ml- respectively. The fact that no maximum residue limit has been set for thiosultap in palm oil internationally suggesting that the default value of 0.01 mg kg- maximum allowable limit is to be enforced. An analytical method that will enable the determination of thiosultap residue at this default level therefore is required to facilitate the monitoring of potential thiosultap residue contamination in palm oil traded in Malaysia.

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Item Type:	Article
AGROVOC Term:	Palm oils
AGROVOC Term:	Chemical analysis (methods)
AGROVOC Term:	Determination of chemicals
AGROVOC Term:	Chromatography
AGROVOC Term:	Mass spectrometry
AGROVOC Term:	Pesticide residues
AGROVOC Term:	Methamidophos
AGROVOC Term:	Monocrotophos
AGROVOC Term:	Food contamination
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8792

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