What does Yan lifts stand for?

Yan Lifts, commonly known name for Lift Engineering, aerial chairlift manufacturing company which ceased operation in 1996 This disambiguation page lists articles associated with the title Yan. If an internal link led you here, you may wish to change the link to point directly to the intended article.

Where is Yan found in a grape?

Most of a grape's YAN content is found in the skins and seeds which gets left behind as pomace after pressing. YAN is a measurement of the primary organic (free amino acids) and inorganic (ammonia and ammonium) sources of nitrogen that can be assimilated by S. cerevisiae.

Which amino acids make up Yan?

Of the Free Amino Nitrogen (FAN) that make up YAN, the amino acids arginine, proline and glutamine are the most abundant followed by alanine, threonine, serine and aspartic acid in much smaller concentrations though trace amounts of most known amino acids can be found in grape must.

How do you measure YAN levels?

YAN levels can be measured using the NOPA assay and a spectrophotometer. Formol titration, invented by the Danish chemist S. P. L. Sørensen in 1907, utilizes formaldehyde in the presence of potassium or sodium hydroxide to measure amino acid concentration and ammonia with the aid of a pH meter.