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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


FREITAS, Larissa; SANTOS, Julio C.; BARCZA, Marcos V.  and  CASTRO, Heizir F. de. Potential alternative for using the glycerol generated in the biodiesel production: enzymatic synthesis of monolaurin by esterification. Quím. Nova [online]. 2009, vol.32, n.9, pp.2277-2281. ISSN 0100-4042.

Esterification reactions of glycerol with lauric acid in solvent free system were carried out using lipases from several sources. All lipases were immobilized on polysiloxane-polyvinyl alcohol particles by covalent binding with high activity recovered. Among the tested enzymes, the Candida antarctica lipase allowed to attain the highest molar conversion (76%), giving similar proportions of monolaurin, dilaurin and low amount of trilaurin. To further improve the process, the Response Surface Methodology (RSM) was used and optima temperature and molar ratio glycerol to lauric acid were found to be 45 ºC and 5:1, respectively. Under these conditions, 31.35% of monolaurin concentrations were attained and this result was in close agreement with the statistical model prediction.

Keywords : glycerol; lipase; factorial design.

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