Wine chemistry: Difference between revisions
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'''Wine chemistry''' is the branch of oenology concerned with the chemical composition of wine and the transformations that occur from grape to finished product, including fermentation, maturation, ageing, and storage. It provides the scientific basis for understanding wine stability, flavour, aroma, texture, colour, and ageing potential, as well as many winemaking decisions and regulatory standards.<ref>Robinson | '''Wine chemistry''' is the branch of oenology concerned with the chemical composition of wine and the transformations that occur from grape to finished product, including fermentation, maturation, ageing, and storage. It provides the scientific basis for understanding wine stability, flavour, aroma, texture, colour, and ageing potential, as well as many winemaking decisions and regulatory standards.<ref>Jancis Robinson, ''Oxford Companion to Wine'', Oxford University Press, 17 Sept. 2015. ISBN 9780198705383.</ref> | ||
== Scope and definition == | == Scope and definition == | ||
[[Wine chemistry]] encompasses both the identification of chemical constituents in wine and the study of how these compounds interact and evolve over time. These processes link viticulture, microbiology, and sensory perception, forming a core discipline within modern wine science.<ref>Jackson, ''Wine Science: Principles and Applications'' | [[Wine chemistry]] encompasses both the identification of chemical constituents in wine and the study of how these compounds interact and evolve over time. These processes link viticulture, microbiology, and sensory perception, forming a core discipline within modern wine science.<ref>PhD Jackson, Ronald S., ''Wine Science: Principles and Applications'', Academic Press Inc, 14 April 2020. ISBN 9780128161180.</ref> | ||
== Major chemical components == | == Major chemical components == | ||
Wine is an aqueous–alcoholic solution containing hundreds of chemical compounds at varying concentrations. The most significant groups include water, ethanol, organic acids, sugars, phenolic compounds, nitrogenous substances, minerals, and volatile aroma compounds.<ref>Ribéreau-Gayon | Wine is an aqueous–alcoholic solution containing hundreds of chemical compounds at varying concentrations. The most significant groups include water, ethanol, organic acids, sugars, phenolic compounds, nitrogenous substances, minerals, and volatile aroma compounds.<ref>Pascal Ribéreau-Gayon, Yves Glories, Alain Maujean, Denis Dubourdieu, & 1 more, ''Handbook of Enology, Volume 2: The Chemistry of Wine - Stabilization and Treatments'', Wiley, 31 Mar. 2006. ISBN 9780470010372.</ref> | ||
=== Water and ethanol === | === Water and ethanol === | ||
Water constitutes the majority of wine by volume, while ethanol, produced during alcoholic fermentation, typically ranges from about 8 % to over 15 % by volume. Ethanol influences mouthfeel, aroma volatility, microbial stability, and the solubility of many flavour-active compounds.<ref>Boulton | Water constitutes the majority of wine by volume, while ethanol, produced during alcoholic fermentation, typically ranges from about 8 % to over 15 % by volume. Ethanol influences mouthfeel, aroma volatility, microbial stability, and the solubility of many flavour-active compounds.<ref>Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, ''Principles and Practices of Winemaking'', Springer, 31 Oct. 1998. ISBN 9780834212701.</ref> | ||
=== Acids and pH === | === Acids and pH === | ||
| Line 14: | Line 14: | ||
=== Sugars === | === Sugars === | ||
Residual sugars, mainly glucose and fructose, originate from grapes and may remain after fermentation depending on wine style and fermentation completeness. [[Sugar]] content interacts with acidity and alcohol to shape perceived balance and sweetness.<ref>Jackson, ''Wine Science: Principles and Applications'' | Residual sugars, mainly glucose and fructose, originate from grapes and may remain after fermentation depending on wine style and fermentation completeness. [[Sugar]] content interacts with acidity and alcohol to shape perceived balance and sweetness.<ref>PhD Jackson, Ronald S., ''Wine Science: Principles and Applications'', Academic Press Inc, 14 April 2020. ISBN 9780128161180.</ref> | ||
=== Phenolic compounds === | === Phenolic compounds === | ||
[[Phenolics]] include tannins, anthocyanins, and related compounds derived from grape skins, seeds, stems, and oak. They are central to wine colour, astringency, bitterness, oxidative behaviour, and ageing capacity, particularly in red wines.<ref>Waterhouse | [[Phenolics]] include tannins, anthocyanins, and related compounds derived from grape skins, seeds, stems, and oak. They are central to wine colour, astringency, bitterness, oxidative behaviour, and ageing capacity, particularly in red wines.<ref>Andrew L. Waterhouse, ''Understanding Wine Chemistry'', Wiley, 19 Aug. 2016. ISBN 9781118627808.</ref> | ||
== Chemical changes during fermentation == | == Chemical changes during fermentation == | ||
Alcoholic fermentation transforms grape must into wine through yeast metabolism, converting sugars into ethanol, carbon dioxide, and numerous secondary metabolites. These reactions alter acidity, generate aroma compounds, and influence the final chemical and sensory profile of the wine.<ref>Boulton | Alcoholic fermentation transforms grape must into wine through yeast metabolism, converting sugars into ethanol, carbon dioxide, and numerous secondary metabolites. These reactions alter acidity, generate aroma compounds, and influence the final chemical and sensory profile of the wine.<ref>Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, ''Principles and Practices of Winemaking'', Springer, 31 Oct. 1998. ISBN 9780834212701.</ref> | ||
== Ageing and chemical evolution == | == Ageing and chemical evolution == | ||
After fermentation, wine continues to evolve chemically through oxidation–reduction reactions, polymerisation of phenolics, ester hydrolysis, and interactions with oxygen and container materials. These processes shape colour development, aroma complexity, and mouthfeel over time.<ref>Ribéreau-Gayon et al., ''Handbook of Enology'', Volume 2, Wiley, 2006 (chemistry of ageing), ISBN 9780470010396.</ref> | After fermentation, wine continues to evolve chemically through oxidation–reduction reactions, polymerisation of phenolics, ester hydrolysis, and interactions with oxygen and container materials. These processes shape colour development, aroma complexity, and mouthfeel over time.<ref>Ribéreau-Gayon et al., ''Handbook of Enology'', Volume 2, Wiley, 2006 (chemistry of ageing), ISBN 9780470010396.</ref> | ||
Controlled oxygen exposure can contribute to desirable maturation effects, while excessive oxidation may lead to loss of freshness or instability.<ref>Waterhouse | Controlled oxygen exposure can contribute to desirable maturation effects, while excessive oxidation may lead to loss of freshness or instability.<ref>Andrew L. Waterhouse, ''Understanding Wine Chemistry'', Wiley, 19 Aug. 2016. ISBN 9781118627808.</ref> | ||
== Analysis and regulation == | == Analysis and regulation == | ||
Latest revision as of 12:00, 19 January 2026
Wine chemistry is the branch of oenology concerned with the chemical composition of wine and the transformations that occur from grape to finished product, including fermentation, maturation, ageing, and storage. It provides the scientific basis for understanding wine stability, flavour, aroma, texture, colour, and ageing potential, as well as many winemaking decisions and regulatory standards.[1]
Scope and definition
Wine chemistry encompasses both the identification of chemical constituents in wine and the study of how these compounds interact and evolve over time. These processes link viticulture, microbiology, and sensory perception, forming a core discipline within modern wine science.[2]
Major chemical components
Wine is an aqueous–alcoholic solution containing hundreds of chemical compounds at varying concentrations. The most significant groups include water, ethanol, organic acids, sugars, phenolic compounds, nitrogenous substances, minerals, and volatile aroma compounds.[3]
Water and ethanol
Water constitutes the majority of wine by volume, while ethanol, produced during alcoholic fermentation, typically ranges from about 8 % to over 15 % by volume. Ethanol influences mouthfeel, aroma volatility, microbial stability, and the solubility of many flavour-active compounds.[4]
Acids and pH
The primary organic acids in wine are tartaric, malic, lactic, and citric acids. Their relative proportions determine total acidity and pH, which in turn affect microbial stability, colour expression, oxidation rate, and sensory perception of freshness and balance.[5]
Sugars
Residual sugars, mainly glucose and fructose, originate from grapes and may remain after fermentation depending on wine style and fermentation completeness. Sugar content interacts with acidity and alcohol to shape perceived balance and sweetness.[6]
Phenolic compounds
Phenolics include tannins, anthocyanins, and related compounds derived from grape skins, seeds, stems, and oak. They are central to wine colour, astringency, bitterness, oxidative behaviour, and ageing capacity, particularly in red wines.[7]
Chemical changes during fermentation
Alcoholic fermentation transforms grape must into wine through yeast metabolism, converting sugars into ethanol, carbon dioxide, and numerous secondary metabolites. These reactions alter acidity, generate aroma compounds, and influence the final chemical and sensory profile of the wine.[8]
Ageing and chemical evolution
After fermentation, wine continues to evolve chemically through oxidation–reduction reactions, polymerisation of phenolics, ester hydrolysis, and interactions with oxygen and container materials. These processes shape colour development, aroma complexity, and mouthfeel over time.[9]
Controlled oxygen exposure can contribute to desirable maturation effects, while excessive oxidation may lead to loss of freshness or instability.[10]
Analysis and regulation
Wine chemistry underpins analytical methods used to assess composition, authenticity, and compliance with legal standards. International organisations define reference methods and compositional frameworks used by regulators and laboratories.[11]
Standardised analytical procedures are also set through ISO norms for specific determinations in alcoholic beverages, supporting comparability across markets.[12]
Economic and global context
Chemical consistency and stability contribute to quality perception and market value, particularly where ageing and provenance influence price formation.[13]
Globalisation has reinforced the role of shared technical benchmarks, analytical regimes, and style expectations, shaping production and evaluation practices across regions.[14]
See also
- Oenology
- Fermentation
- Malolactic fermentation
- Phenolic compounds
- Volatile compounds
- Sulfur dioxide
- Oxidation
- Stabilisation
- pH
- Wine style
- Cellaring
References
- ↑ Jancis Robinson, Oxford Companion to Wine, Oxford University Press, 17 Sept. 2015. ISBN 9780198705383.
- ↑ PhD Jackson, Ronald S., Wine Science: Principles and Applications, Academic Press Inc, 14 April 2020. ISBN 9780128161180.
- ↑ Pascal Ribéreau-Gayon, Yves Glories, Alain Maujean, Denis Dubourdieu, & 1 more, Handbook of Enology, Volume 2: The Chemistry of Wine - Stabilization and Treatments, Wiley, 31 Mar. 2006. ISBN 9780470010372.
- ↑ Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, Principles and Practices of Winemaking, Springer, 31 Oct. 1998. ISBN 9780834212701.
- ↑ Peynaud, Knowing and Making Wine, Wiley, 1984 (chemical balance and taste), ISBN 9780471881491.
- ↑ PhD Jackson, Ronald S., Wine Science: Principles and Applications, Academic Press Inc, 14 April 2020. ISBN 9780128161180.
- ↑ Andrew L. Waterhouse, Understanding Wine Chemistry, Wiley, 19 Aug. 2016. ISBN 9781118627808.
- ↑ Roger B. Boulton, Vernon L. Singleton, Linda F. Bisson, Ralph E. Kunkee, & 1 more, Principles and Practices of Winemaking, Springer, 31 Oct. 1998. ISBN 9780834212701.
- ↑ Ribéreau-Gayon et al., Handbook of Enology, Volume 2, Wiley, 2006 (chemistry of ageing), ISBN 9780470010396.
- ↑ Andrew L. Waterhouse, Understanding Wine Chemistry, Wiley, 19 Aug. 2016. ISBN 9781118627808.
- ↑ OIV, “Chemical composition of wine”, https://www.oiv.int
- ↑ ISO 3591, Alcoholic beverages — Determination of extract.
- ↑ Anderson, The Economics of Wine, Edward Elgar, 2010 (chemistry and quality), ISBN 9781847201006.
- ↑ Anderson & Pinilla, Wine Globalization, Cambridge University Press, 2018 (standardisation), ISBN 9781108445687.