TY - JOUR
T1 - Flow-based system for the determination of titratable acidity in wines
AU - Vidigal, Susana S. M. P.
AU - Ramos, Ana T. C.
AU - Rangel, António O. S. S.
N1 - Funding Information:
Susana Vidigal acknowledges Fundação para a Ciência e a Tecnologia (FCT), Portugal, and Fundo Social Europeu (FSE), European Union, for the financial support through the Programa Operacional Capital Humano (POCH) via the grant with Ref. SFRH/BPD/78705/2011. This work was supported by National Funds from FCT through project PEst-OE/EQB/LA0016/2013.
Publisher Copyright:
© 2016, Springer Science+Business Media New York.
PY - 2016/8/1
Y1 - 2016/8/1
N2 - A flow injection analysis system with a spectrophotometric detection was arranged in order to develop a simple and fast methodology for the quantification of titratable acidity in different types of wines. In the proposed system, a precise volume of sample is injected in the carrier stream, composed by a mixture of OH− solution with the pH indicator, bromothymol blue (BTB). Consequently, a change on the colour of the carrier solution is achieved and quantified by spectrophotometry. Therefore, it was possible to establish a linear range up to 0.16 g/L expressed as tartaric acid, with a limit of detection and quantification of 0.01 and 0.05 g/L, respectively. The proposed work has a low sample and reagents consumption, only 96 μg of BTB, 336 mmol de OH− and 50 μL of sample were needed per assay. At the same time, a high determination rate was achieved, 75 determinations per hour. The developed methodology was applied on the quantification of total acidity in red and white table wine and port wine samples.
AB - A flow injection analysis system with a spectrophotometric detection was arranged in order to develop a simple and fast methodology for the quantification of titratable acidity in different types of wines. In the proposed system, a precise volume of sample is injected in the carrier stream, composed by a mixture of OH− solution with the pH indicator, bromothymol blue (BTB). Consequently, a change on the colour of the carrier solution is achieved and quantified by spectrophotometry. Therefore, it was possible to establish a linear range up to 0.16 g/L expressed as tartaric acid, with a limit of detection and quantification of 0.01 and 0.05 g/L, respectively. The proposed work has a low sample and reagents consumption, only 96 μg of BTB, 336 mmol de OH− and 50 μL of sample were needed per assay. At the same time, a high determination rate was achieved, 75 determinations per hour. The developed methodology was applied on the quantification of total acidity in red and white table wine and port wine samples.
KW - Bromothymol blue
KW - Flow-injection system
KW - Spectrophotometry
KW - Table and port wine
KW - Titratable acidity
UR - http://www.scopus.com/inward/record.url?scp=84955275540&partnerID=8YFLogxK
U2 - 10.1007/s12161-016-0408-7
DO - 10.1007/s12161-016-0408-7
M3 - Article
AN - SCOPUS:84955275540
SN - 1936-9751
VL - 9
SP - 2241
EP - 2245
JO - Food Analytical Methods
JF - Food Analytical Methods
IS - 8
ER -