Ammonia is found in both grape juice and wine. It is an important nutrient for yeast during primary fermentation.

The amount of NADH consumed is measured at 340 nm and is stoichiometrically related to the amount of ammonia present. The Yeast Available Nitrogen (YAN) content of the juice can be determined by adding the Ammonia Nitrogen (AN) content to the Primary Amino Acid Nitrogen (PAAN) content.

THIS PRODUCT REQUIRES THE USE OF A SPECTROPHOTOMETER

To ensure the integrity and long life of this perishable product we prefer to ship to you on Monday, Tuesday and Wednesday. This is because we don’t want it to suffer if it is delayed over a weekend. If you are sure we can send it safely later in the week then please advise us accordingly.