Yeast Available Nitrogen (YAN) – In addition to sugar, yeast cells require nitrogen as a nutrient to carry out the alcoholic fermentation. Available nitrogen, also known as Yeast Available Nitrogen (YAN), is one of the most critical nutrients and its concentration is measured in milligrams per liter (mg/L) in the juice. A minimal range of 140 to 225 mg/L is sufficient for a healthy fermentation. Lower concentrations may lead to stuck fermentations while concentrations >350mg/L may result in off-aromas and flavors. For our Tier 1 test, we use a Hanna 902 Titrator.
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