“Lees (fermentation)”的意思、由来-开放百科全书

词条

Lees (fermentation)

释义

Sur lie
Other uses
Light lees protocol
References

Lees are deposits of dead yeast or residual yeast and other particles that precipitate, or are carried by the action of "fining", to the bottom of a vat of wine after fermentation and aging. The yeast deposits in beer brewing are known as trub. However, yeast deposits from secondary fermentation of both wine and beer are referred to as lees. This material is the source for most commercial tartaric acid, which is used in cooking and in organic chemistry.^[1]

Normally, the wine is transferred to another container (racking), leaving this sediment behind. Some wines (notably Chardonnay, Champagne, and Muscadet) are sometimes aged for a time on the lees (a process known as sur lie), leading to a distinctive yeasty aroma and taste. The lees may be stirred (bâtonage in French) to promote uptake of the lees' flavour.

The lees are an important component in the making of ripasso, where the leftover lees from Amarone are used to impart more flavour and colour to partially aged Valpolicella.{{fact|date=June 2018}}

Sur lie

{{see also|Yeast in winemaking}}Sur lie literally translates from French as 'on lees'. Sur lie wines are bottled directly from the lees without racking (a process for filtering the wine). In the case of great Chardonnay, such as Montrachet, this adds a toasty, nutty "hazelnut" quality and additional depth and complexity. Chemically, this can alter the oak flavour molecules, increasing the integration, and making the oak seem less obtrusive to the palate. This is desirable because oak tannins are polyphenolic acids, and can be harsh. This process can also give an added freshness and creaminess to the wine, and improve color and clarity. Muscadet is made in this fashion. The effect of the lees during bottle fermentation for at least 18 months on Champagne is considerable. The "bready" toasty notes associated with some of the greatest sparkling wines made are the result of sur lie aging.^[2]

Other uses

Beer on lees (trub) is also sometimes made. Many of the beers offered by the Quebec, Canada-based Unibroue are on lees.

Kombucha can also be brewed sur lie.

Light lees protocol

In a process in which yeast is added to wine that has completed primary fermentation, this secondary yeast addition typically remains in the wine from 2-8 weeks, depending on the winemaker's goals. The yeast is stirred (bâtonage) frequently during the protocol, and racked when the protocol is complete. Also known as secondary autolysis, a light lees protocol releases additional mannoproteins and polysaccharides that can influence the flavour and mouthfeel of the wine.

References

1. ^J.-M. Kassaian "Tartaric acid" in Ullmann's Encyclopedia of Industrial Chemistry; VCH: Weinheim, Germany, 2002, 35, 671-678. {{DOI|10.1002/14356007.a26_163}}
2. ^J. Robinson (ed) "The Oxford Companion to Wine" Third Edition pg 669 Oxford University Press 2006 {{ISBN|0198609906}}

GelägerFeccia (enologia)

3 : Fermentation in food processing|Winemaking|Yeasts

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。