Ramli, Nurul Syahmi Mohd
(2005)
Occurrence of lipid peroxidation in
repeatedly used cooking oil in Kelantan.
Other.
Pusat Pengajian Sains Kesihatan, Universiti Sains Malaysia.
(Submitted)
Abstract
Lipid peroxidation (LPO) is the oxidative deterioration of lipids containing any number of
carbon - carbon double bonds. It is a chain reaction providing a continuous supply of free
radicals that initiate further peroxidation.
The purpose of this study is to standardize a simple and cheap method for estimating
oxidation of lipids in the cooking oil samples. The other objective of this study is to
compare the occurrence of oxidation of lipids in fresh cooking oil and repeatedly used
cooking oil samples.
The reused oil samples are obtained from four stalls who were selling fried bananas. They
were supplied with EKONOMI palm oil packs or pouches to be used on daily basis. The
oil has been used solely for deep - frying the bananas. The banana hawkers were instructed
to keep using the oil left at the end of the day for the next day business and they were
allowed to refill the oil with the fresh one when needed. The collection of the oil was on
daily basis for 7 consecutive days followed by the 14th day, 21 81 day and 30th day following
the reusage.
Our study has shown that the malondialdehyde concentration in the reused oil at all four
banana stalls was increased during the period (30 days) of our study. The results have
shown that the increased malondialdehyde concentration in the reused oil following
rancidity were due to many factors. The factors which caused an increased amount of
malondialdehyde concentration in the reused oil were air pollution, dirty utensils, length oftime period that the oil has been used, an infrequent replacement of reused oil with fresh
one and the locality of the stall.
The pH of the reused oil samples was also been measured. Most of the reused oil samples
from all stalls showed a decrease of pH throughout the study period. The reduced in pH
showed that the reused oil samples had become more acidic in comparison to the fresh oil
samples. This might have enhanced malondialdehyde formation.
Future studies, in animal models following feeding of oil samples might open new
horizons in the ill - health effects of such oil in human population.
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