Esterification of benzoic acid and glycerol to α-monobenzoate glycerol in solventless media using an industrial free Candida antarctica lipase B |
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Authors: | JJ Tamayo M Ladero VE Santos F García-Ochoa |
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Institution: | Dpto. Ingenieria Quimica, Fac. CC. Quimicas, Universidad Complutense, 28040 Madrid, Spain |
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Abstract: | The enzymatic reaction of benzoic acid and glycerol in the absence of organic solvents to obtain the 1- or 3-monobenzoate glycerol (α-MBG) is studied. Esterification runs were batch wise performed with a concentration of enzyme of 30 g/L, changing the initial concentration of the acid in glycerol from 20 to 60 g/L, and temperature from 50 to 70 °C. In these conditions, the most active lipase among those tested for this synthesis was lipase B isozyme from Candida antarctica (CALB), obtaining conversion values higher than 80% and a significant selectivity to α-MBG. Unlike the synthesis in organic media, water did not have an inhibitory behaviour; hence control of water activity was unnecessary. Temperature and benzoic acid act synergically as deactivating factors. Considering the aforementioned, a kinetic model according to a Michaelis–Menten mechanism is proposed. This model considers a partial enzymatic deactivation mechanism with two terms, one of them accounting for the deactivating action of the acid. |
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