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Talanta

Title:		A flow-based platform for measuring the acidity parameters in wine
Author(s):		Vidigal S; Rangel A;
Address:		"Universidade Catolica Portuguesa, CBQF - Centro de Biotecnologia e Quimica Fina - Laboratorio Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobao Vital, Apartado 2511, 4202-401 Porto, Portugal. Electronic address: svidigal@porto.ucp.pt. Universidade Catolica Portuguesa, CBQF - Centro de Biotecnologia e Quimica Fina - Laboratorio Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobao Vital, Apartado 2511, 4202-401 Porto, Portugal"
Journal Title:		Talanta
Year:		2017
Volume:		20170310
Issue:
Page Number:		313 - 319
DOI:		10.1016/j.talanta.2017.03.029
ISSN/ISBN:		1873-3573 (Electronic) 0039-9140 (Linking)
Abstract:		"The present work describes a valuable tool for winemaking industry to measure the acidity parameters with rapid response, simple sample handling, with no or minimal pre-treatment. Thus, a sequential injection analysis (SIA) system with spectrophotometric detection was used as platform for the development of methodologies for the quantification of volatile and total acidity in wine samples. Both procedures make use of the same colour reagent, bromothymol blue (BTB) that changes its intrinsic colour in the presence of the acidity compounds. The volatile acidity value was attained with the separation of the volatile fraction of acids by means of a membrane separation technique, a gas-diffusion unit. For the total acidity value, the sample was merged with the colour reagent on the way towards detection. The fixed acidity is a result of the difference from the total and the volatile acidity. The presented tool displayed a low sample and reagent consumption, 346 and 102microL of sample and 37 and 32microg of BTB, for the volatile acidity (VA) and for the total acidity (TA), respectively. The observed limits of detection and quantification were 0.03 and 0.01gL(-1) (VA) and 0.09 and 0.02gL(-1) (TA) with high determination rates, 35 (VA) and 62 (TA) determinations per hour. The proposed system was successfully applied to the quantification of volatile, total and fixed acidity in white table wine samples. The obtained results were in good agreement with the ones obtained by the reference methods"
Keywords:		Acids/*analysis Flow Injection Analysis/*methods Spectrophotometry/*methods Volatile Organic Compounds/*analysis Wine/*analysis Bromothymol blue Gas-diffusion unit Sequential injection analysis system Spectrophotometry Table white wine;
Notes:		"MedlineVidigal, Susana S M P Rangel, Antonio O S S eng Netherlands 2017/04/11 Talanta. 2017 Jun 1; 168:313-319. doi: 10.1016/j.talanta.2017.03.029. Epub 2017 Mar 10"