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K-LARGE Megazyme L-ARGININE / UREA / AMMONIA (Rapid) YEAST AVAILABLE NITROGEN (YAN) ASSAY PROCEDURE
This kit contains 150 assays. (50 each - arginine,urea, ammonia)
The addition of nutrient supplements to grape juice prior to/during fermentation can now be managed accurately in terms of Yeast Available Nitrogen (YAN). YAN is especially important to quantitate accurately, as too little available nitrogen can result in sluggish or “stuck” fermentation, and the generation of hydrogen sulphide (H2S) gas, while too much nitrogen, such as in the form of diammonium phosphate (DAP), can lead to the formation of the carcinogenic compound ethyl carbamate, especially where starting levels of L-arginine in the juice are high.