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Articles by Jumat Salimon
Total Records ( 5 ) for Jumat Salimon
  Bashar Mudhaffar Abdullah and Jumat Salimon
  The lipid fraction of Malaysian rubber seed was extracted and analyzed for toxicological compounds such as linamarin. Analytical methods (rat’s toxicological test and brine shrimps test) were applied to determine the presence of such compounds. Malaysian rubber seed oil was extracted using different solvents (hexane and chloroform+methanol). The oil was found not to contain unusual fatty acids and it is rich in essential unsaturated fatty acids, particularly linoleic (37.28±0.10%) and linolenic (19.22±0.21%). Malaysian rubber seed oil showed no toxic potential toward the rats. Bioassay experiments, in which shrimps were used as test organisms, were performed to evaluate the toxicity of linamarin extracted from the oil. The median lethal concentration (LC50) was found to be 211.70%. The results showed no acute toxicity effects, probably since Malaysian rubber seed oil was not found to contain any hazardous linamarin.
  Bashar Mudhaffar Abdullah and Jumat Salimon
  Linoleic Acid (LA) from a mixture of free fatty acids obtained from local Jatropha curcas seed oil was separated using urea complex fractionation. In this study, variations of factors that affect the urea complex fractionation such as the ratio of urea to free fatty acid, crystallization temperature and crystallization time were examined to obtain optimum condition using response surface method (D-optimal design). Under the optimal conditions, the percentage of LA was 92.81 and the percentage of yield of NUCF 7.8 at urea/FFA ratio (w/w) 5, a crystallization temperature of -10°C and a crystallization time 24 h. This showed that the experimental conditions should be suitable for the preparation of high purity LA. Performing the experiment at this condition gave results that were close to the predicted values.
  H. Abdul Halim , H.A. Jumaat , M.A. Juhari , A.R. Sahibin , Hafiza A. Hamid , Ramlan Bin Omar , Gire Kibe Gopir , Jumat Salimon and Barzani Qasim
  A study integrating remote sensing and Geographical Information System (GIS) was carried out in the Kuala Terengganu district, Terengganu, Malaysia to map and determine the land use change as a result of development pressure in the area. Two sets of Landsat Thematic Mapper (TM) dated 31 July 1988 and 14 July 2002, at scale 1: 150 000 were acquired. Land use classes were interpreted from these images and the resultant maps were checked in the field to determine ground truth and mapping accuracy. The land use map data were transferred directly into the computer via ILWIS (Integrated Land Water and Water Information System) version 3.1 software. It shown that in this study seven categories of land use changes were detected namely forest (-9.93%), agricultural (-1.46%), swamp (-36.92%), urban (190.29%), cleared land (-21.43%), water bodies (-7.48%) and bush/shrub (6.34%). The accuracy assessment undertaken showed that the total accuracy for produced the map is 77.89%. This study showed that Landsat TM is a useful data for study in land use change.
  Bashar Mudhaffar Abdullah and Jumat Salimon
  This study has attempted to show the efficiency of epoxidation under different catalysts conditions. It was found that different catalysts have been used for epoxidation of oil and unsaturated fatty acid with almost complete conversion and mono-epoxide of unsaturated carbon. Catalysts such as H2SO4, Ti(IV)-grafted silica catalysts, tungsten-based catalyst, acidic ion, exchange resin, potassium peroxomonosulfate, alumina-catalzed have been studied. H2SO4 was found to be more effective in terms of oxirane complete conversion. The epoxidation of oils and unsaturated fatty acids is widely used for the production of oxiranes, valuable industrial products providing an access to various fine chemicals but none has yet found industrial application. The application of different catalysts enables the preparation of a number of epoxy compounds impossible to obtain by other methods, or considerable improvement of the yields of those currently studied.
  Naowara M. Al-Arafi and Jumat Salimon
  The catalytic activity of Bronsted acidic ionic liquid N-methyl-2-pyrrolidonium methyl sulphate ([NMP][CH3SO3]) was studied in the esterification of oleic acid with oleyl alcohol under mild conditions and without any additional organic solvent. The effect of various reaction parameters were optimised to obtain a high percentage yield (%) of oleyl oleate. The optimal conditions for the ester synthesis were a reaction time of 8 h, temperature at 90°C, amount of catalyst 9.9% as a percentage of the weight of the oleic acid and a molar ratio of substrate of 1 which resulted in a maximum percentage yield of 86%. Analysis of the product of the reaction using FTIR, 1H and 13C NMR showed the presence of oleyl oleate.
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