https://jopr.mpob.gov.my Wed, 17 Nov 2021 07:16:18 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/determination-of-chlorpyrifos-in-refined-palm-olein-by-gc-fpd-and-gc-ecd/ Sat, 13 Nov 2021 15:39:07 +0000 https://jopr.mpob.gov.my/V2/?p=9341 Chlorpyrifos (a pesticide containing phosphorous and chlorine) from oil matrix was determined using gas chromatography (GC) with a flame photometric (FPD) and electron capture (ECD) detectors. In the first experiment, the detector (FPD) used gave recoveries (from palm olein samples spiked with chlorpyrifos at levels of 0.04-0.10 μg ml^-1) ranging from 89% to 100% with coefficients of variation from 2.9% to 10.8%. In the second experiment, ECD showed recoveries (from palm olein spiked with chlorpyrifos at levels 0.02-0.10  μg ml^-1) of greater than 97% with coefficients of variations ranging from 0.5% to 2%. The results showed that using GC, the ECD and FPD are suitable detectors for quantification of chlorpyrifos in oil matrix.

]]> https://jopr.mpob.gov.my/optimization-of-the-sweep-co-distillation-clean-up-method-for-the-determination-of-organochlorine-pesticide-residues-in-palm-oil/ Sat, 13 Nov 2021 15:02:13 +0000 https://jopr.mpob.gov.my/V2/?p=9153 The optimum conditions were developed for the quantitative recovery of organochlorine pesticide residues in palm oil using a commercial sweep co-distillation apparatus. Under the optimum conditions (245^oC distillation temperature, 250 ml min ^-1 nitrogen flow rate, 45 min sweep time) and using a trap packed with sodium sulphate and partially deactivated Florisil, the recoveries of 14 organochlorine pesticide residues at ppm and ppb levels in a spiked oil matrix were> 80%, with coefficients of variation ranging from 5.6% – 9.9%. However, the recovery for endrin ketone was below 80% with a coefficient of variation of 8.5%. The cleaned-up extracts were quantified by gas chromatography using a micro-electron capture detector with a fused silica capillary column containing a non-polar bonded phase.

]]> https://jopr.mpob.gov.my/determination-of-%ce%bb-cyhalothrin-in-palm-and-oalm-kernel-oil-using-tandem-solid-phase-extraction-cartridges/ Sat, 13 Nov 2021 08:03:01 +0000 https://jopr.mpob.gov.my/V2/?p=9021 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.

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