Rapid measurement of methyl cellulose precipitable tannins using ultraviolet spectroscopy with chemometrics: Application to red wine and inter-laboratory calibration transfer

Dambergs, R, Mercurio, M, Kassara, S, Cozzolino, D and Smith, P 2012, 'Rapid measurement of methyl cellulose precipitable tannins using ultraviolet spectroscopy with chemometrics: Application to red wine and inter-laboratory calibration transfer', Applied Spectroscopy, vol. 66, no. 6, pp. 656-664.


Document type: Journal Article
Collection: Journal Articles

Title Rapid measurement of methyl cellulose precipitable tannins using ultraviolet spectroscopy with chemometrics: Application to red wine and inter-laboratory calibration transfer
Author(s) Dambergs, R
Mercurio, M
Kassara, S
Cozzolino, D
Smith, P
Year 2012
Journal name Applied Spectroscopy
Volume number 66
Issue number 6
Start page 656
End page 664
Total pages 9
Publisher Sage Publications
Abstract Information relating to tannin concentration in grapes and wine is not currently available simply and rapidly enough to inform decision-making by grape growers, winemakers, and wine researchers. Spectroscopy and chemometrics have been implemented for the analysis of critical grape and wine parameters and offer a possible solution for rapid tannin analysis. We report here the development and validation of an ultraviolet (UV) spectral calibration for the prediction of tannin concentration in red wines. Such spectral calibrations reduce the time and resource requirements involved in measuring tannins. A diverse calibration set (n = 204) was prepared with samples of Australian wines of five varieties (Cabernet Sauvignon, Shiraz, Merlot, Pinot Noir, and Durif), from regions spanning the wine grape growing areas of Australia, with varying climate and soils, and with vintages ranging from 1991 to 2007. The relationship between tannin measured by the methyl cellulose precipitation (MCP) reference method at 280 nm and tannin predicted with a multiple linear regression (MLR) calibration, using ultraviolet (UV) absorbance at 250, 270, 280, 290, and 315 nm, was strong (r 2val=0.92; SECV=0.20 g/L). An independent validation set (n = 85) was predicted using the MLR algorithm developed with the calibration set and gave confidence in the ability to predict new samples, independent of the samples used to prepare the calibration (r 2val = 0.94; SEP = 0.18 g/L). The MLR algorithm could also predict tannin in fermenting wines (r 2val=0.76; SEP=0.18 g/L), but worked best from the second day of ferment on. This study also explored instrument-to-instrument transfer of a spectral calibration for MCP tannin. After slope and bias adjustments of the calibration, efficient calibration transfer to other laboratories was clearly demonstrated, with all instruments in the study effectively giving identical results on a transfer set.
Subject Sensor Technology (Chemical aspects)
Food Sciences not elsewhere classified
Keyword(s) Tannin
UV spectroscopy
Ultraviolet spectroscopy
Chemometrics
Calibration transfer
Red wine
Food analysis
DOI - identifier 10.1366/11-06516
Copyright notice © 2012 Society for Applied Spectroscopy
ISSN 0003-7028
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