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Methoxypyrazine composition of Coccinellidae-tainted Riesling and Pinot noir wine from Germany.
J Sci Food Agric. 2015 Feb; 95(3):509-14.JS

Abstract

BACKGROUND

Harmonia axyridis (multicolored Asian ladybeetle) and Coccinella septempunctata (seven-spot ladybeetle) (Coccinellidae) are found in many wine regions in Europe and the Americas, where they are responsible for a pronounced wine fault known as 'ladybug taint' when incorporated with grapes during harvest operations. Methoxypyrazines have been proposed in the literature as the compounds responsible for the taint. This study sought to expand on this identification and also determine the effectiveness of heating Coccinellidae-affected grape must prior to fermentation as a possible remedial intervention. Riesling and Pinot noir grapes were infested with H. axyridis or C. septempunctata at different densities and fermented to dryness. The Pinot noir was either must heated prior to fermentation or processed without heating (control). All wines were analyzed for 2-isopropyl-, 2-sec-butyl-, 2-isobutyl- and 2,5-dimethyl-3-methoxypyrazine using headspace solid phase microextraction/multidimensional gas chromatography/mass spectrometry.

RESULTS

Concentrations of 2-isopropyl-3-methoxypyrazine increased with beetle density for both Coccinellidae species, while other methoxypyrazines showed inconsistent or no variation with infestations levels. Heating of Pinot noir grapes prior to fermentation resulted in a moderate decrease in all methoxypyrazines.

CONCLUSION

These results provide direction for more targeted treatments aimed at remediating musts/wines affected by Coccinellidae and indicate that winegrowers do not need to differentiate between H. axyridis and C. septempunctata when making action threshold decisions in the vineyard or winery.

Authors+Show Affiliations

Julius Kühn-Institut, Federal Research Center for Cultivated Plants, Institute for Plant Protection in Fruit Crops and Viticulture, Geilweilerhof, D-76833, Siebeldingen, Germany.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24863136

Citation

Kögel, Susanne, et al. "Methoxypyrazine Composition of Coccinellidae-tainted Riesling and Pinot Noir Wine From Germany." Journal of the Science of Food and Agriculture, vol. 95, no. 3, 2015, pp. 509-14.
Kögel S, Botezatu A, Hoffmann C, et al. Methoxypyrazine composition of Coccinellidae-tainted Riesling and Pinot noir wine from Germany. J Sci Food Agric. 2015;95(3):509-14.
Kögel, S., Botezatu, A., Hoffmann, C., & Pickering, G. (2015). Methoxypyrazine composition of Coccinellidae-tainted Riesling and Pinot noir wine from Germany. Journal of the Science of Food and Agriculture, 95(3), 509-14. https://doi.org/10.1002/jsfa.6760
Kögel S, et al. Methoxypyrazine Composition of Coccinellidae-tainted Riesling and Pinot Noir Wine From Germany. J Sci Food Agric. 2015;95(3):509-14. PubMed PMID: 24863136.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Methoxypyrazine composition of Coccinellidae-tainted Riesling and Pinot noir wine from Germany. AU - Kögel,Susanne, AU - Botezatu,Andreea, AU - Hoffmann,Christoph, AU - Pickering,Gary, Y1 - 2014/07/15/ PY - 2013/12/15/received PY - 2014/04/22/revised PY - 2014/05/20/accepted PY - 2014/5/28/entrez PY - 2014/5/28/pubmed PY - 2015/8/28/medline KW - Coccinella septempunctata KW - DMMP KW - Harmonia axyridis KW - IPMP KW - ladybug taint SP - 509 EP - 14 JF - Journal of the science of food and agriculture JO - J Sci Food Agric VL - 95 IS - 3 N2 - BACKGROUND: Harmonia axyridis (multicolored Asian ladybeetle) and Coccinella septempunctata (seven-spot ladybeetle) (Coccinellidae) are found in many wine regions in Europe and the Americas, where they are responsible for a pronounced wine fault known as 'ladybug taint' when incorporated with grapes during harvest operations. Methoxypyrazines have been proposed in the literature as the compounds responsible for the taint. This study sought to expand on this identification and also determine the effectiveness of heating Coccinellidae-affected grape must prior to fermentation as a possible remedial intervention. Riesling and Pinot noir grapes were infested with H. axyridis or C. septempunctata at different densities and fermented to dryness. The Pinot noir was either must heated prior to fermentation or processed without heating (control). All wines were analyzed for 2-isopropyl-, 2-sec-butyl-, 2-isobutyl- and 2,5-dimethyl-3-methoxypyrazine using headspace solid phase microextraction/multidimensional gas chromatography/mass spectrometry. RESULTS: Concentrations of 2-isopropyl-3-methoxypyrazine increased with beetle density for both Coccinellidae species, while other methoxypyrazines showed inconsistent or no variation with infestations levels. Heating of Pinot noir grapes prior to fermentation resulted in a moderate decrease in all methoxypyrazines. CONCLUSION: These results provide direction for more targeted treatments aimed at remediating musts/wines affected by Coccinellidae and indicate that winegrowers do not need to differentiate between H. axyridis and C. septempunctata when making action threshold decisions in the vineyard or winery. SN - 1097-0010 UR - https://www.unboundmedicine.com/medline/citation/24863136/Methoxypyrazine_composition_of_Coccinellidae_tainted_Riesling_and_Pinot_noir_wine_from_Germany_ L2 - https://doi.org/10.1002/jsfa.6760 DB - PRIME DP - Unbound Medicine ER -