Crude glycerol utilisation in monolaurin production using immobilised Rhizomucor miehei lipase: optimisation and thermodynamics study

Nur Artikah Muhammad Shahrin, . and Pei Wen Chin, . and Noor Aziah Serri, . Crude glycerol utilisation in monolaurin production using immobilised Rhizomucor miehei lipase: optimisation and thermodynamics study. pp. 615-623. ISSN 1511-2780

The significant growth of biodiesel industry causes an excessive production of crude glycerol in Malaysias market especially being as one of the global biggest producers and exporters of palm oil. The ability of crude glycerol being reused as a substrate to produce monolaurin has been the main focus while catalysing the production efficiency using Lipozyme RM IM a commercial immobilised Rhizomucor miehei lipase in a solvent-free system. Optimal reaction conditions obtained were 8:1 molar ratio of crude glycerol to lauric acid temperature 47C and lipase loading 1 wt of lauric acid. Over 82 lauric acid conversion with 56 mol monolaurin yields was achieved within 8 hr. Using Arrhenius equation and transition-state theory thermodynamic studies on monolaurin synthesis under the optimum conditions were performed. Energy of activation (Ea) and energy of deactivation (Ed) were found to be 89.5 kJ mol- and 110.7 kJ mol- respectively suggesting that higher energy was required for enzyme irreversible denaturation to occur. Values of enthalpy (86.90 H 86.84 KJ mol) entropy (0.29 S 0.28 kJ mol K) and Gibbs free energy (-2.53 G -5.22 kJ mol-) of the esterification were also determined.

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Abstract

The significant growth of biodiesel industry causes an excessive production of crude glycerol in Malaysias market especially being as one of the global biggest producers and exporters of palm oil. The ability of crude glycerol being reused as a substrate to produce monolaurin has been the main focus while catalysing the production efficiency using Lipozyme RM IM a commercial immobilised Rhizomucor miehei lipase in a solvent-free system. Optimal reaction conditions obtained were 8:1 molar ratio of crude glycerol to lauric acid temperature 47C and lipase loading 1 wt of lauric acid. Over 82 lauric acid conversion with 56 mol monolaurin yields was achieved within 8 hr. Using Arrhenius equation and transition-state theory thermodynamic studies on monolaurin synthesis under the optimum conditions were performed. Energy of activation (Ea) and energy of deactivation (Ed) were found to be 89.5 kJ mol- and 110.7 kJ mol- respectively suggesting that higher energy was required for enzyme irreversible denaturation to occur. Values of enthalpy (86.90 H 86.84 KJ mol) entropy (0.29 S 0.28 kJ mol K) and Gibbs free energy (-2.53 G -5.22 kJ mol-) of the esterification were also determined.

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Item Type:	Article
AGROVOC Term:	Glycerol
AGROVOC Term:	Enzymatic activity
AGROVOC Term:	Immobilization
AGROVOC Term:	Lipases
AGROVOC Term:	Rhizomucor miehei
AGROVOC Term:	Mono and diglycerides
AGROVOC Term:	Lauric acid
AGROVOC Term:	Biochemical reactions
AGROVOC Term:	Glycerides
AGROVOC Term:	Fatty acids
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/8790

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