Posts Tagged ‘malolactic fermentation’

Grapes to Wine: The Process of Fermentation

Monday, October 19th, 2009

Quick, who discovered the process of fermentation?  I’ll share the answer at the end of this article.  Suffice it to say, the concept has been known for just over two hundred and fifty years.

Let’s go back to first year college or perhaps even high school chemistry as fermentation is, in essence, just a chemical reaction.  Fermentation is the process of converting sugar (from grapes) to ethanol (ethyl alcohol) through the metabolism of yeast.  The process is anaerobic (oxygen free) and generates heat in the form of carbon dioxide (CO2).  In fact, sugar that has been infused with yeast, looks like it’s boiling as it releases carbon dioxide. The true chemical equation is:

C6H12O6 yields 2C2H5OH + 2CO2

Wine Acidity = Freshness

Tuesday, May 5th, 2009

Have you ever taken a sip of a steely crisp white wine such as a New Zealand Sauvignon Blanc or a Chablis and been delighted with its clean and refreshing character?  That’s the treat of acidity at work.

Wine is inherently an acidic drink.  Even wines that taste sweet to the consumer are very high in acid; the residual sugar simply masks the acidic character.  One of the key characteristics of a sweet German Ries-ling is the “racing acidity” underlying the sweetness, providing an ideal balance.

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