Tindak Balas Di Antara Beta-Karotena Dalam Minyak Kelapa Sawit Dengan Asid Dan Dengan Ion Ferik

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dc.contributor.authorGoh, Leong San
dc.date.accessioned2016-10-21T01:35:40Z
dc.date.available2016-10-21T01:35:40Z
dc.date.issued1995-06
dc.description.abstractThe reaction between H+ or Fe 3+ with carotenes in palm oil produced a blue green solution. Analysis using the uv-spectrometer and electric conductivity indicated that the blue green colouration was ionic in nature. The absorption peaks in the uv-vis-spectrum were related to the cations formed from carotene .The cations formed in the reaction of carotenes in palnl oil with acid absorbed at an absorption maximum of 899 nm i ni tially. Location of thisĀ· peak then shifted to 675 nm .Cations were also formed in the reaction of H+ or Fe3+ with pure carotenes. Peak appeared initially at 920 nm then shifted to 715 nm finally for the reaction of beta-carotenes with acid. The reaction between Fe3+ with beta-carotenes gave a peak at 924 nm and then shifted to 720 nm. The observed shifts in the absorption maximum from -900 nm to 700 nm implied that there was a change in the conjugation of the double bonds in the carotene cations. These cations could also be obtained through the reactions of beta-carotene with trichloroacetic acid." The conductivity of the carotene solution increased initially and achieved an equalibrium value finally. The cations formed could be destroyed by adding water. A riumber of products were obtained by silica column separation. The eluted fraction absorbed at ... 400 nm. The identi.ty of the major fraction retained on the top of the column was found ~o be oligomers with 2-3 units of carotene molecules. Kinetic studies on the reaction between beta-carotenes and sulfuric acid showed that two,stages were involved. The first stage was pseudo first order whi le the second stage was first order in carotene. The activation energy for the first stage of the reaction was 65.2 KJ/mol ; and 9.5 KJ/mol for the second stage reaction. Reaction between F'e3+ and beta-carotene solution yielded a black solid at high concentration. Kinetics of the reaction of Fe3+ with carotene solution was first order. The overall reaction scheme was proposed.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/2781
dc.subjectThe blue green colourationen_US
dc.subjectwas ionic in natureen_US
dc.titleTindak Balas Di Antara Beta-Karotena Dalam Minyak Kelapa Sawit Dengan Asid Dan Dengan Ion Feriken_US
dc.typeThesisen_US
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