Ever Wonder Where Fruit Aromas & Flavors Come From in Wines?

When I first became interested in wines, I remember asking if other fruits were used in the production of wines. After all, so many wines smell and taste like a lot of fruits other than grapes. So, if grapes are the only fruits used in wine making, how do all those other aromas and flavors get into the wine?

Well, it turns out that there’s a lot going on during fermentation, not just the yeast converting the grape’s natural sugar to alcohol. There are also chemical reactions going on that create hundreds of aroma and flavor compounds. Wow!

These “compounds” are identical to the compounds that we already associate with smells and tastes. So, when you smell a fruit aroma in wine you are smelling the same aroma compounds that also naturally occur in those fruits. The same is true with flavors.

Other aromas such as vanilla, tobacco, leather, coffee, caramel and toast come from the oak aging of the wines. Depending on the amount of ‘toasting’ the barrel undergoes affects the range and depth of these aromas.

So next time you have a glass of wine take time to smell it in the glass before you sip. You’ll be amazed to discover the aromas of dark fruits in red wines such as berries and plums while white wines can have aromas of apples, pears, melons and citrus. And then sip the wine and enjoy all the fruit flavors it has to offer. Cheers!

Ever Had a Peppery Zinfandel?

Zinfandel is a very popular California wine. One that can take on two very different flavor personalities.

Zinfandel that is grown in warm places usually results in grapes that get very ripe and produce big jammy “fruit bomb” flavors. High alcohol levels are usually included in these wines. But, Zinfandel that is grown in cooler climates can result in wines with lots of herbal flavors.

While Zinfandel can have a variety of herbal flavors, the primary one is usually described as “peppery.” A recent article in Wine Spectator (June 2018) featured California Zinfandels with descriptions that included “…pepper…savory cracked pepper…green peppercorn…white pepper aromas…fresh pepper aromas…cracked pepper notes…white pepper flavors…loaded with pepper…smoky pepper flavors.”

The reason for these peppery flavors in wine is a bit technical, but let’s give it a try. It has to do with physical chemical compounds. And, the compound rotundone is responsible for contributing the spice qualities similar to the experience of cracked peppercorns. Now, just to take this one step further down the technical path, rotundone is part of a larger class of aromatic terpenes called sesquiterpenes, which is the primary compound found in black or white peppercorns.

But, there is no where near the quantity of rotundone found in the skins of wine grapes than in peppercorns. They are so few that they are not perceivable in the grape off the vine (that would be a bit weird to bite into a peppery grape!). But the tiny amounts of this compound often become perceivable in the taste of wines following the process of fermentation. And, yes, there’s a lot of chemistry going on there too.

Now, this peppercorn flavor from rotundone is not to be confused with bell peppers. This is also a flavor that is commonly found in wines. These are due to methoxypyrazines which are commonly occurring compounds that result in subtle vegetable or herb-like aromas and flavors, such as bell peppers, asparagus or mint. Methoxypyrazines (usually referred to as pyrazines) are found in numerous wines, including Zinfandels, when the grapes are picked slightly underripe or “green,” or when the grapes are fermented with grape stems, which are high in methoxypyrazines. So, it is not uncommon to find lighter, earlier picked or stem-fermented styles of Zinfandel that are also slightly herbal due to pyrazines.

So, bell pepper and black pepper flavor compounds are not the same but they can appear in wines for different reasons. Nonetheless, next time you get to enjoy a Zinfandel, try to determine which of the two flavor personalities it has — jammy or peppery. And, which peppery flavors you are experiencing.

Cheers!