Journal of Oil Palm Research Vol. 24 (1) April 2012, p. 1303-1309 HALIMAH Muhamad ; BADRUL HISYAM Zainudin + ; NOR KARTINI Abu Bakar +
This article outlines a new method based on low-temperature fat precipitation extraction with acetonitrile and graphitised carbon black/primary secondary amine (GCB/PSA) solid-phase extraction clean-up for the extraction of λ-cyhalothrin residue in both crude palm oil (CPO) and crude palm kernel oil (CPKO). Determination of λ-cyhalothrin was then carried out using gas chromatography (GC) equipped with an electron capture detector (ECD). Analyses for λ-cyhalothrin in palm oil and palm kernel oil samples spiked with different levels of λ-cyhalothrin (0.05, 0.08, 0.1, 0.5, and 1.0μg g-1) were performed. Mean recoveries for six replicates ranged from 82% to 98% for CPO and from 86% to 94% for CPKO, with relative standard deviation (RSD) values of less than 10% in most cases. The limit of detection for λ-cyhalothrin in both CPO and CPKO was 0.05 µg g-1. The method was successfully applied to the analysis of λ-cyhalothrin in CPO samples obtained from local palm oil mills throughout Malaysia. No λ-cyhalothrin was found in the 30 samples analysed.KEYWORDS:
* Malaysian Palm Oil Board, P. O. Box 10620,
50720 Kuala Lumpur, Malaysia.
** Department of Chemistry, Faculty of Science,
Universiti Malaya, Lembah Pantai,
50603 Kuala Lumpur, Malaysia.