ORCID Profile
0000-0003-1949-4170
Current Organisations
University of Melbourne
,
CSIRO
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Publisher: Wiley
Date: 21-03-2021
DOI: 10.1002/AOCS.12478
Abstract: This study aims to investigate the influence of high‐intensity sunlight radiation on the photooxidation of tropical oils (TO). Coconut oil (CNO), palm oil (PO), and palm kernel oil (PKO) were chosen for determining the indicators of photooxidation when exposed to and in the absence of sunlight for 7 weeks. The results showed a significant ( P 0.05) increase in free fatty acid (FFA) levels and peroxide value (PV) when the TO were exposed to sunlight. The iodine value and color content decreased significantly ( P 0.05) due to the decomposition of unsaturated FFA owing to the breaking down of the π‐bonds and the degradation of color pigments during photooxidation. Fourier transform infrared spectroscopy (FTIR) analysis showed strong vibrational absorptions at 1721 and 3505 cm −3 , 1720 and 3560 cm −3 , and 1721 and 3554 cm −3 for the CNO, PO, and PKO s les exposed to sunlight, respectively. These bands can be attributed to the presence of secondary oxidation products, which were absent in the TO that were not exposed to sunlight. A simulation was performed to support the FTIR results, which also indicated peaks from the secondary oxidation products at 1744 and 3660 cm −3 . The study also revealed that the rate of photooxidation was different for each TO. The rate of oxidation followed the order PO PKO CNO. In contrast, no notable changes were observed in the TO kept away from sunlight. These results suggest that exposing TO to sunlight influences their oxidation stability and quality.
Publisher: Elsevier BV
Date: 03-2023
Publisher: Hindawi Limited
Date: 11-12-2021
DOI: 10.1002/ER.7453
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 12-2022
Publisher: Springer Science and Business Media LLC
Date: 02-07-2022
Publisher: Elsevier BV
Date: 09-2022
Publisher: Japan Oil Chemists' Society
Date: 2022
DOI: 10.5650/JOS.ESS21402
Abstract: This study conducts postmarketing surveillance for the photosensitised oxidation of vegetable oils (VOs) stored in different conditions in the marketplace during commercialisation. Coconut oil, palm kernel oil, soybean oil and sunflower oil were exposed to direct sunlight and kept in the dark for six weeks. The results showed a significant (p < 0.05) increase in PV and a severe decrease in the iodine value, chlorophyll, β-carotene, colour content, and the fatty acid compositions (oleic and linoleic acids mainly) in the light-exposed VOs. The FTIR analysis also identified the formation of the hydroperoxides (3444 cm
Publisher: Sciencedomain International
Date: 11-01-2020
DOI: 10.9734/CSJI/2019/V28I430150
Abstract: The local vegetable oils (Coconut and Palm Kernel Oils) are usually faced with short shelf-life which has been associated with the presence of some unwanted materials present in them. This study explores the potential of using locally manufactures Zeolites in removing these impurities to improve the shelf life of these oils. The Zeolite used in this study was synthesized using locally available raw materials such as bauxite and kaolin through the hydrothermal process X-ray diffraction studies of the synthesized Zeolite were found to be part of the ZSM-11 Zeolite type group. FTIR analysis of the s le showed a weak vibrational peak at 1642cm-1 and a strong band at 987cm-1. Batch process for the removal of these unwanted materials was performed. Percentage reduction of 85.71%, 89.22%, 89.36% and 83.81% was recorded for impurities, moisture content, free fatty acid and peroxide value reduction in Palm Kernel Oil and 85.71%, 83.33%, 93.26%, 90.57% for Coconut Oil. Kinetic studies showed the process favored the Pseudo-first order with R2 of 0.956 and 0.971 for Coconut and Palm Kernel Oil respectively for impurities The plot of (t / qe) vs. t exhibits a very high linearity and can be concluded that the adsorption rate of the moisture content, impurities, FFA and peroxide value is dependent on the adsorbate used and contact time. The final oils had very good physicochemical parameters with improved qualities. It can be concluded that the synthesized Zeolite was effective for the refining of locally produced Coconut and Palm Kernel Oils and can be accessed for commercial applications.
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 03-2023
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