YAN – The Secrets of Fermentation & Nutrients

YAN (Yeast Assimilable Nitrogen) is a measure of how much usable Nitrogen yeast have as a nutrient source. Having enough usable Nitrogen is an important part of a healthy fermentation – too little YAN can result in sluggish or stuck fermentation and generation of H2S, while too much YAN can lead to the formation of ethyl carbamate.

Calculate YAN of must or juice with a Megazyme PANOPA Assay Kit

Nutrients made from yeast cells are high in nitrogen, but the form of the nitrogen is very important - no matter how high the product’s total nitrogen, yeast cells can ‘starve’ if it is not in a usable form. Not all nutrients are created equal! Even the richest of yeast products, while providing many benefits to yeasts, do not contain as much YAN as DAP, so if one complex blend is much higher in YAN than another, either the testing methods were inappropriate, or the one with the higher YAN is likely to contain more DAP. Ask your supplier!

BSG Wine stocks a full range of complex nutrient blends to accommodate the widest range of must and fermentation conditions:

Superfood® provides the nutritious supplements yeasts need for growth and survival during the anaerobic stress of fermentation, in doses that are most advantageous. Superfood® contains a variety of nitrogen sources, and is much better for yeasts than plain DAP or other nutrient blends, which contain much more DAP (45% up to almost 100%).

Startup™ was formulated to provide all of the complex nutrition in Superferm® and Superfood®, but without inorganic nitrogen (DAP). It is perfect for musts that do not need extra nitrogen, or when winemakers want to add all their own DAP.

Superferm® has a higher percentage of minerals and vitamins and less DAP (only 25%), which is MUCHâless than many other blends. It is designed for fermentations that are expected to be challenging.

For info on Nutrients and all the other essential harvest supplies, give us a call.

Doug Manning - Technical Sales Manager, Napa & Central CA, NV e:dmanning@bsgwine.com c: 707.256.9891

Scott Anker - Sales Manager, Central Coast & Southern CA, AZ e:sanker@bsgwine.com p: 805.437.9672

Tinu Els - Sales Manager, Norther CA, OR WA and ID e: tels@bsgwine.comp:707-499-4197

Ilya Soroka - Sales Manager, North Central USA e: isoroka@bsgcraft.comc: 414.732.7382

Kevin Kawa - Sales Manager, Eastern Region USA e:kkawa@bsgcraft.comc: 215.205.9837

Les Ferguson - Sales Manager, Southern States e: lferguson@bsgcraft.comp: 817.614.2565

Ryu Yamamoto - Technical Sales Director e: ryamamoto@bsgwine.com

Sadhana Brent - Customer Service Manager e: sbrent@bsgwine.com p: 707.252.2550 Ext 1