https://jopr.mpob.gov.my Wed, 17 Nov 2021 02:44:59 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/synthesis-and-characterization-of-acetylated-glucose-fatty-esters-from-palm-and-palm-kernel-oil-fatty-methyl-esters/ Sat, 13 Nov 2021 15:42:08 +0000 https://jopr.mpob.gov.my/V2/?p=9363 Acetylated glucose fatty esters (AGFE) were synthesized from palm and palm kernel fatty acid methyl esters (FAME) through a one-stage solvent-free interesterfication reaction with glucose pentaacetate (GPA). Two main products obtained and identified were mono-and di-substituted AGFEE. The hydrophile-lipophile balance (HLB), ternary phase diagram, cytotoxicity and antimicrobial bioassays were studied.

]]> https://jopr.mpob.gov.my/fatty-acyl-substituent-induced-changes-in-c-chemical-shifts-of-carbonyl-carbons-a-tool-for-structural-elucidation-in-acetylated-glucose-esters-of-palm-fatty-acid/ Sat, 13 Nov 2021 15:42:35 +0000 https://jopr.mpob.gov.my/V2/?p=9368 Substituent-induced changes (SIC) in 13C-chemical shifts of carbonyl carbon atoms upon interesterification of glucose pentaacetate (GPA) with fatty acid methyl esters (FAME) of stripped palm kernel oil (SPKO), palm oil (PO) and capric (C₁₀) acid, were used to determine the number and positions of the fatty acid substituents on the pyranosyl ring. Results show that SIC on the ring carbon and ring proton atoms are not always consistent with the molecular structures. But SIC on the carbonyl carbon atoms are however unambiquous and consistent with molecular structures of all the products. The analysis of ¹³C-chemical shift changes of carbonyl carbon therefore provides a means to determine the number and positions of fatty acyl groups in polyacetylated glucopyranoses

]]> https://jopr.mpob.gov.my/selectivity-and-kinetics-of-interesterification-reaction-of-glucose-pentaacetate-with-fatty-acid-methyl-esters/ Sat, 13 Nov 2021 08:13:49 +0000 https://jopr.mpob.gov.my/V2/?p=9101 Acetylated glucose fatty esters (AGFEs) were prepared by a solvent-free interesterification reaction of glucose pentaacetate (GPA) and mixed fatty acid methyl ester (FAME) of palm oil (PO)-based fatty acids. The relative selectivity of fatty acyl groups towards the GPA ring and the kinetics of the interesterification process were studied. The selectivity studies have shown that the longer chain fatty acyl groups were preferred in the interesterification process involving GPA and FAMEs. In the C₆ to C_l0 fatty acids group C _l0 was the most favoured, while C_18:1 had the highest selectivity in the C₁₂ to C_18:2group. The results also showed that the reactions involving oleic-FAME and C_6-10-FAME proceeded via zero-order kinetics with respect to GPA

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