🍷 Chaptalisation

Chaptalisation (in EU law, enrichment) is adding sugar to grape must before or during fermentation to raise the alcohol content of the wine. Yeast turns the added sugar into alcohol, so the wine becomes stronger, not sweeter. It rescues the harvest of cool years, when the grapes did not gather enough sugar.

In the EU enrichment is allowed where climatic conditions have made it necessary. Sucrose, concentrated grape must or rectified concentrated grape must may be added to fresh grapes, must and new wine still fermenting; sucrose only by dry sugaring. Sucrose may not be added in Italy, Spain, Greece, Portugal, Cyprus and some departments of southern and south-western France.

Natural alcoholic strength may be raised by at most 3 % vol in zone A, 2 % in zone B and 1.5 % in zones C, with a further 0.5 % in exceptionally unfavourable years. After enrichment the total alcoholic strength may not exceed 11.5 % in zone A, 12 % in zone B, 12.5 % in zone C I, 13 % in C II and 13.5 % in C III; for red wine, Member States may raise the limit to 12 % in zone A and 12.5 % in zone B. Zone A includes Germany outside Baden, zone B includes Baden, Alsace, Champagne and Austria, and Italy and Spain lie in the C zones.

The method is named after Jean-Antoine Chaptal (1756–1832), a French chemist and minister who popularised sugaring of wines in his 1807 treatise on winemaking, although his priority is disputed. The word chaptalisation first appeared in 1866 in a Larousse dictionary.

Why it matters to you. Chaptalisation does not make wine sweet and is not fraud: it is an authorised practice with clear limits. It explains why wines from cool regions reach their usual strength even after a dull summer, and why the same product is usually not both enriched and acidified.