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Título : Synthesis of propyl gallate by transesterification of tannic acid in aqueous media catalysed by immobilised derivatives of tannase from Lactobacillus plantarum
Autor : Fernández-Lorente, Gloria, Bolivar, Juan M., Rocha-Martin, Javier, Curiel, José Antonio, Muñoz, Rosario, Rivas, Blanca de las, Carrascosa, Alfonso V., Guisán, José M.
Palabras clave : Transesterifications in aqueous media
Natural antioxidants
Fecha de publicación : 2011
Editor: Elsevier
Resumen: 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.
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ISSN: 0308-8146
Citación : Food Chemistry 128(1): 214–217 (2011)
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