How to Pick a Wine Making Yeast

How to Pick a Wine Making Yeast

Yeast is the most critical ingredient in the wine making process. When you pick a wine making yeast you are, in effect, choosing the destiny of your wine. The right yeast or yeasts can transform a good grapes into a great wine. Where do The Differences Come From? These tiny organisms are truly amazing. Not only does it make the production of wine possible it is the only micro-organism capable of producing this elixir. However, the notion that different yeasts can alter the way a wine tastes in the end is a relatively new discovery. For most of this worlds past 6,000 years of winemaking history winemakers didn’t even know what yeast was let alone understanding the different strains and what they can do. Only in recent history have we discovered that different strains will produce different characteristics in wine. Fermentation, from the yeasts perspective, is merely the digestion of food. They consume and process sugars and produce alcohol and carbon dioxide as their byproduct. Some yeast strains may use more or less enzymes or esters and it’s these small differences in digestion that account for different flavor profiles. To help you sift through all the different yeasts and how they affect different grape varietals our friends over at MoreWineMaking.com have put together an amazing guide! Click here to browse their entire collection of free manuals and pick up Yeast and Grape Pairing. Picking A Winemaking Yeast To give you an idea of how to pick a wine yeast I’ll walk you through my own decision making process. My next wine is going to be a Riesling kit and I’m going to do a little experiment. I’m going to pick my own yeast to replace whatever the kit comes with. I’ll be using two different yeast strains in a split fermentation. Half of the grape juice will be fermented with one strain of yeast and the strain will ferment the other half. This way I can directly compare how the same wine tastes when made from two very different yeasts. Here are the yeasts I’ve chosen and why. The first yeast is W15. This yeast is known to produce citrus flavors, heavy mouthfeel, and can stand up to aging. Aging is an important characteristic for a kit wine for reasons we’ll explore here in a minute. Th second yeast I’ve picked is R-HST (catchy name huh?). This yeast can produce rose and peach flavors, some mouthfeel, as well as minerality. Minerality is a quality that also lends itself to aging. The Differences Take Time to Manifest In an interesting article on the flavor contributions of yeast Cornell researchers found that most characteristics yeast impart on wine take six months to a year to show up. This is, in part, why it took so long for winemakers to figure out that different yeasts produced different flavor profiles. They were comparing wines too early. Kits generally don’t produce wine that can be aged for very long. My concern is that the wine will start to decline before the yeast characteristics show up. This is why I chose two strains known to produce wines that can be aged. Ferment Separately Because...

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