饮料(酒精)
糖或淀粉经酵母发酵成乙醇 — 清酒、蜂蜜酒、苹果酒、马格利、普尔克、酸啤
本页正文在 v1 版本中仅以英文提供。界面与元数据已翻译为中文。v2 将进行专业编辑翻译。
关于此分类
Alcoholic fermentation is the conversion of sugar to ethanol and CO₂ by yeast — primarily Saccharomyces cerevisiae in cultivated form, but with significant Brettanomyces, Saccharomyces pastorianus (lager yeast), and wild non-Saccharomyces species playing roles in specific traditions. The overall reaction (C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂) has been understood biochemically for over a century but practiced empirically for millennia.
The category divides by substrate. *Honey-based (mead, traditional, and its variants metheglin/melomel/cyser/braggot) — the oldest documented alcoholic fermentation tradition, found archaeologically as far back as 7000 BCE in China. Fruit-based (cider, perry, wine) — fruit sugars fermented directly. Natural cider in Normandy, Brittany, England, and the Basque country represents one of the most preserved traditional alcohol categories. Grain-based — requires an additional step because grain starch isn't directly fermentable: it must first be saccharified (broken into fermentable sugars) by either Aspergillus oryzae koji (sake, makgeolli) or malted-grain amylases (beer). Agave-based — pulque uses Zymomonas mobilis (a non-Saccharomyces bacterial fermenter rare in commercial use) on maguey sap. Specialty/mixed-culture* — sour beer, lambic, and other Brettanomyces-driven traditions use multi-organism communities that contradict normal beer brewing's emphasis on culture purity.
The sake-style approach is technically distinctive. Multiple parallel fermentation describes the simultaneous saccharification (koji enzymes converting rice starch to sugar) and fermentation (yeast converting sugar to ethanol) happening in the same vessel — the koji and yeast working in concert. Sake reaches naturally high alcohol levels (18-20% in the fermentation tank, typically diluted to 14-16% for bottling) — among the highest-ABV fermented beverages produced without distillation.
The alcoholic-fermentation category cross-pollinates with culture more than any other ferment family. Wine has shaped European culture; beer has shaped Northern European culture; sake has shaped Japanese culture; cider has shaped Norman and English culture. The traditions in this category carry geographic-protection regimes (Champagne, Cognac, Bordeaux, sake from designated Tokutei Meishōshu producers, traditional method cider from Hereford or Normandy) and form some of the world's most legally-defined food categories.
The modern home-fermentation revival has reached alcoholic ferments via the homebrewing community — beer, mead, cider, and increasingly sake all have active home-production traditions. The technical bar varies: cider is among the easiest home ferments (crush apples, add yeast, wait), while sake is among the hardest (koji cultivation, multi-stage moromi, temperature control).
共同微生物学
所属发酵食品
此分类共享的关键技巧
- Match yeast strain to substrate and target — sake yeast for sake, ale yeast for ales, lager yeast for lagers, wine yeast for wine and cider. Cross-applying strains produces unintended flavors.
- Control fermentation temperature carefully — most ale yeasts work at 18-22°C; lager yeasts at 8-12°C; sake yeast at 6-15°C through a stepped temperature profile. Temperature mismatches produce off-flavors.
- Sanitize meticulously — alcoholic fermentation is most vulnerable to contamination by acetic acid bacteria (which convert ethanol to vinegar) and wild yeasts (which produce off-flavors). The post-boil, pre-fermentation step is the highest-risk moment.
- Use airlocks during fermentation to allow CO₂ release while preventing oxygen ingress — oxygen ingress at the wrong time produces oxidized off-flavors and feeds spoilage organisms.
- Allow secondary aging where appropriate — many alcoholic ferments improve substantially with 3-12 months of bulk aging after primary fermentation. Drinking too young can hide quality.
此分类的常见错误
- Pitching yeast at the wrong temperature — too hot kills the yeast (especially fragile sake or lager yeast). Always pitch at the target fermentation temperature.
- Using too little yeast — produces stuck fermentation. A 5-gallon batch needs a yeast starter of 100+ billion cells; dry yeast packets are typically calibrated for this.
- Sanitization shortcuts — invites contamination. The cliché 'cleanliness is godliness in brewing' is functionally true.
- Bottling before fermentation is complete — produces over-carbonated bottles that may break or 'bottle bombs.' Use a hydrometer to verify final gravity before bottling.
- Tasting alcoholic ferments while fermentation is still vigorous — the active-phase taste is harsh, yeasty, and undeveloped. Final taste develops over weeks of conditioning after fermentation completes.