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Pectin methylesterase activity determined by different methods and thermal inactivation of exogenous pme in mango juice Ciência e Agrotecnologia
Gonzalez,Samantha Lemke; Lima,Regina Cristina Aparecida; Carneiro,Eliana Beleski Borba; Almeida,Mareci Mendes de; Rosso,Neiva Deliberali.
Pectin methylesterase (PME) hydrolyzes methyl ester groups in pectin chains to form carboxylic groups, releasing methanol and H3O+. The aim of this study was to determine PME activity in samples of pectinases by UV-VIS spectroscopy, to measure the acid and methanol produced in the reaction of pectin with pectinase and to verify the thermal inactivation of exogenous PME in mango juice. The activity of PME in samples of pectinase was determined by potentiometry, UV-VIS spectroscopy, and by the action of alcohol oxidase. The reaction showed greater activity at pH 4.0 to 4.5 and at a temperature of 45° C. PME activity determined by UV-VIS spectroscopy with bromophenol blue indicator showed a good correlation with the activity determined by potentiometry and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pectin metilesterase; Activity; Thermal inactivation; Mango juice.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542011000500017
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