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Closed Access item Synthesis of propyl gallate by transesterification of tannic acid in aqueous media catalysed by immobilised derivatives of tannase from Lactobacillus plantarum

Authors:Fernández-Lorente, Gloria
Bolivar, Juan M.
Rocha-Martin, Javier
Curiel, José Antonio
Muñoz, Rosario
Rivas, Blanca de las
Carrascosa, Alfonso V.
Guisán, José M.
Keywords:Transesterifications in aqueous media, Natural antioxidants, 1-Propanol
Issue Date:2011
Citation:Food Chemistry 128(1): 214–217 (2011)
Abstract:Immobilised derivatives of tannase from Lactobacillus plantarum were able to catalyse the transesterification of tannic acid by using moderate concentrations of 1-propanol in aqueous media. Transesterification of tannic acid was very similar to transesterification of methyl gallate. The synthetic yield depended on the pH and concentration of 1-propanol, although it did not vary much when using 30% or 50% 1-propanol. Synthetic yields of 45% were obtained with 30% of 1-propanol at pH 5.0. The product was chromatographically pure, and the reaction by-product was 55% pure gallic acid. On the other hand, immobilised tannase was fairly stable under optimal reaction conditions.
Publisher version (URL):http://dx.doi.org/doi:10.1016/j.foodchem.2011.02.057
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