Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/72565
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Type: Journal article
Title: Rapid method for proline determination in grape juice and wine
Author: Long, D.
Wilkinson, K.
Poole, K.
Taylor, D.
Warren, T.
Astorga, M.
Jiranek, V.
Citation: Journal of Agricultural and Food Chemistry, 2012; 60(17):4259-4264
Publisher: Amer Chemical Soc
Issue Date: 2012
ISSN: 0021-8561
1520-5118
Statement of
Responsibility: 
Danfeng Long, Kerry L. Wilkinson, Kate Poole, Dennis K. Taylor, Tristan Warren, Alejandra M. Astorga and Vladimir Jiranek
Abstract: Proline is typically the most abundant amino acid present in grape juice and wine. The amount present is influenced by viticultural and winemaking factors and can be of diagnostic importance. A method for rapid routine quantitation of proline would therefore be of benefit for wine researchers and the industry in general. Colorimetric determination utilizing isatin as a derivatizing agent has previously been applied to plant extracts, biological fluids, and protein hydrolysates. In the current study, this method has been successfully adapted to grape juice and wine and proved to be sensitive to milligram per liter amounts of proline. At sugar concentrations above 60 g/L, interference from the isatin-proline reaction was observed, such that proline concentrations were considerably underestimated in grape juice and dessert wine. However, the method was robust for the analysis of fermentation samples and table wines. Results were within ±10% agreement with data generated from typical HPLC-based analyses. The isatin method is therefore considered suitable for the routine analysis required to support research into the utilization or release of proline by yeast during fermentation.
Keywords: Grape juice; HPLC; isatin; proline; wine
Rights: Copyright © 2012 American Chemical Society
RMID: 0020118901
DOI: 10.1021/jf300403b
Appears in Collections:Agriculture, Food and Wine publications

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