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Cell membrane damage induced by phenolic acids on wine lactic acid bacteria
Campos, F.M.; Couto, J.A.; Figueiredo, A.R.; Tóth, I.V.; Rangel, A.O.S.S.; Hogg, T.A.The aim of this work was to investigate the effect of phenolic acids on cell membrane permeability of lactic acid bacteria from wine. Several phenolic acids were tested for their effects on the cell membrane of Oenococcus oeni and Lactobacillus hilgardii by measuring potassium and phosphate efflux, proton influx and by assessing culture viability employing a fluorescence technique based on membrane integrity. T...
Cell membrane damage induced by phenolic acids on wine lactic acid bacteria
Campos, F. M.; Couto, J. A.; Figueiredo, A. R.; Tóth, I. V.; Rangel, A. O. S. S.; Hogg, T. A.
Fluorimetric detection of cell membrane lesions in wine lactic acid bacteria ex...
Moreira, J. M.; Reis, O. A.; Campos, F. M.; Tóth, I. V.; Figueiredo, A. R.; Couto, J. A.; Rangel, A. O. S. S.; Hogg, T. A.
Determinação potenciométrica de efluxo de potássio em bactérias lácticas do vin...
Campos, F. M.; Couto, J. A.; Hogg, T. A.; Rangel, A. O. S. S.; Tóth, I. V.
Spectrophotometric determination of carbon dioxide and sulphur dioxide in wines...
Atanassov, G.T.; Lima, R.C.; Mesquita, R.B.R.; Rangel, A.O.S.S.; Tóth, I.V.Flow injection analysis (FIA) methods for the spectrophotometric determination of CO2 and SO2 in wines are described. The determination of CO2 is based on the colour change of a low capacity buffer (containing an acid-base indicator) due to the dissolved carbon dioxide. The determination of SO2 is based on the decoloration of malachite green by sulphur dioxide. Two FIA manifolds are presented; one for the deter...
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