Abstract
Chitinases and thaumatin-like proteins are important grape proteins as they have a great influence on wine quality. The quantification of these proteins in grape juices and wines, along with their purification, is therefore crucial to study their intrinsic characteristics and the exact role they play in wines. The main isoforms of these two proteins from Chardonnay grape juice were thus purified by liquid chromatography. Two fast protein liquid chromatography (FLPC) steps allowed the fractionation and purification of the juice proteins, using cation exchange and hydrophobic interaction media. A further high-performance liquid chromatography (HPLC) step was used to achieve higher purity levels. Fraction assessment was achieved by mass spectrometry. Fraction purity was determined by HPLC to detect the presence of protein contaminants, and by nuclear magnetic resonance (NMR) spectroscopy to detect the presence of organic contaminants. Once pure fractions of lyophilized chitinase and thaumatin-like protein were obtained, ultra-HPLC (UHPLC) and enzyme-linked immunosorbent assay (ELISA) calibration curves were constructed. The quantification of these proteins in different grape juice and wine samples was thus achieved for the first time with both techniques through comparison with the purified protein calibration curve. UHPLC and ELISA showed very consistent results (less than 16% deviation for both proteins) and either could be considered to provide an accurate and reliable quantification of proteins in the oenology field.
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Abbreviations
- BSA:
-
bovine serum albumin
- Cyt C:
-
horse heart cytochrome C
- FPLC:
-
fast protein liquid chromatography
- HIC:
-
hydrophobic interaction
- HPLC:
-
high-performance liquid chromatography
- MES:
-
2-(N-morpholino)ethane sulfonic acid
- NMR:
-
nuclear magnetic resonance
- PBS:
-
phosphate-buffered saline
- PR:
-
pathogenesis-related
- PTA-ELISA:
-
plate-trapping antigen–enzyme-linked immunosorbent assay
- RP:
-
reversed-phase
- RSD:
-
relative standard deviation
- SCX:
-
strong cation exchange
- SDS-PAGE:
-
sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- TBS:
-
Tris-buffered saline
- TFA:
-
trifluoroacetic acid
- TL:
-
thaumatin-like
- UHPLC:
-
ultra-HPLC
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Acknowledgements
We thank the Champagne Ardenne Area, the General Council of Marne, the Ministry of Research, the Ville de Reims, the A.R.O.C.U. Association, and the Champagne Moët & Chandon for their support. We gratefully thank the wine cooperative of Nogent l’Abesse (France) for providing grape juice and wines samples. We also acknowledge Dr. S. Jégou (University of Reims Champagne-Ardenne, France) in appreciation of her contribution.
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Published in the special issue Wine Analysis with Guest Editor Isabelle Pianet.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00216-011-5053-9
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Le Bourse, D., Conreux, A., Villaume, S. et al. Quantification of chitinase and thaumatin-like proteins in grape juices and wines. Anal Bioanal Chem 401, 1541–1549 (2011). https://doi.org/10.1007/s00216-011-4912-8
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DOI: https://doi.org/10.1007/s00216-011-4912-8