Abstract
Seven commercial metatartaric acid (MTA) products used for tartaric stabilization of wines were investigated regarding molecular masses and composition. Combined size-exclusion chromatography with MALS detection showed that the products had medium molecular masses in a range of 2–9 kDa. All samples were highly polydisperse products with a broad molecular weight distribution. Beside oligomeric or polymeric contents, the products contained on average 13 g/100 g monomeric tartaric acid, thus reducing the effectiveness of MTA in respect of achieving tartaric stability. An analytical method to determine MTA in wines and grape juices based on an anion-exchange cleanup step, HPLC separation, and MS detection was developed. The method shows a sufficient robustness to evaluate important enological or food legal aspects in connection with MTA.
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Acknowledgments
We gratefully acknowledge the Forschungsring Deutscher Weinbau (Research Group German Viticulture, reference number 8503.093/4) for funding. In addition, the authors are grateful to the GfL Berlin for assistance.
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Sprenger, S., Hirn, S., Dietrich, H. et al. Metatartaric acid: physicochemical characterization and analytical detection in wines and grape juices. Eur Food Res Technol 241, 785–791 (2015). https://doi.org/10.1007/s00217-015-2503-1
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DOI: https://doi.org/10.1007/s00217-015-2503-1