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Advisor(s)
Abstract(s)
The enzymatic determination of L(-)malic and L(+)lactic acids in several types of wines by flow injection analysis (FIA) with spectrophotometric detection is described. This flow injection system, which incorporates a dialysis unit for adjusting the composition of the injected solutions to the requirements of the measuring system, enables determinations of these two organic acids without the need for any prior treatment of the wine samples, with a concentration interval of between 0.02 and 4 g/L, and a sampling rate of approximately 20 determinations per hour. The results obtained with this FIA method for various types of Portuguese wines are in good agreement with those of the batch method which uses the same enzymatic technique and are quite precise as they present a coefficient of variation below 2.5%.
Description
Keywords
Flow injection analysis L(-)malic acid L(+)lactic acid Spectrophotometric enzymatic determination Wine
Pedagogical Context
Citation
LIMA, José L. F. C.; Rangel, António O.S.S. - Enzymatic Determination of L(-)malic and L(+)lactic Acids in Wine by Flow Injection Analysis . American Journal of Enology and Viticulture. ISSN 0002-9254. Vol. 43 n.º 1 (1992), p. 58-62
Publisher
American Society for Enology and Viticulture