Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/2965
Título: Rapid determination of tartaric acid in wines
Autor: Bastos, Sandra S. T.
Tafulo, Paula A. R.
Queirós, Raquel Barbosa
Delerue-Matos, Cristina
Sales, M. Goreti F.
Palavras-chave: Spectrophotometry
Flow injection analysis
Data: 2009
Editora: Bentham Science
Relatório da Série N.º: Combinatorial Chemistry & High Throughput Screening; Vol. 12, Issue 7
Resumo: A flow-spectrophotometric method is proposed for the routine determination of tartaric acid in wines. The reaction between tartaric acid and vanadate in acetic media is carried out in flowing conditions and the subsequent colored complex is monitored at 475 nm. The stability of the complex and the corresponding formation constant are presented. The effect of wavelength and pH was evaluated by batch experiments. The selected conditions were transposed to a flowinjection analytical system. Optimization of several flow parameters such as reactor lengths, flow-rate and injection volume was carried out. Using optimized conditions, a linear behavior was observed up to 1000 µg mL-1 tartaric acid, with a molar extinction coefficient of 450 L mg-1 cm-1 and ± 1 % repeatability. Sample throughput was 25 samples per hour. The flow-spectrophotometric method was satisfactorily applied to the quantification of tartaric acid (TA) in wines from different sources. Its accuracy was confirmed by statistical comparison to the conventional Rebelein procedure and to a certified analytical method carried out in a routine laboratory.
Peer review: yes
URI: http://hdl.handle.net/10400.22/2965
ISSN: 1386-2073
Versão do Editor: http://www.eurekaselect.com/69741/article
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