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Worksheet: YAN Calculations

Download Printable PDF of this Production Guide

How to Determine Your YAN

YAN is the summation of both the inorganic (ammonia, NH4+) and organic (primary amino nitrogen, PAN; free amino nitrogen, FAN) components that can be utilized by the yeast.

Therefore, to figure out your YAN for a given lot of juice or must, you must add the two numbers together. Need help wrapping your head around this concept? Give this calculation worksheet a try!

Calculate Your Starting YAN

Let’s say you measured 45 mg N/L of inorganic nitrogen, or ammonia ions through one analysis. For that same lot of juice, you measure 68 mg N/L of PAN. Your starting YAN is:

45 mg N/L + 68 mg N/L = 113 mg N/L.

Calculate Your Total YAN

Your total YAN can be calculated by adding the starting YAN (see above) from the fruit plus nitrogen contributed by nutrient additions made during primary fermentation.

Nitrogen contributions of a nutrient product (e.g., GoFerm) are based on the addition. For example, DAP contributes ~2 mg N/L for each 1 g/hL addition rate. Therefore, if you add 10 g/hL of DAP to the fermentation, you are adding ~20 mg N/L to the starting YAN.

Using the following nitrogen addition rates from Scott Labs, see if you can determine the total YAN that will go into the fermentation.

Addition RateN ContributionAddition RateN Contribution
GoFerm 30 g/hL10 mg N/LFermaid O 25 g/hL10 mg N/L
Fermaid K 25 g/hL25 mg N/LDAP 1 g/hL2 mg N/L

 

Starting YANNutrient AdditionsTotal YAN
97 mg N/LGoFerm 30 g/hL
Fermaid K 25 g/hL
 

97 + ____ + ____ = ____

172 mg N/LGoFerm 30 g/hL
Fermaid O 10 g/hL
Fermaid K 25 g/hL
 

172 + ____ + ____ + ____ = ____

105 mg N/LGoFerm 30 g/hL
Fermaid K 25 g/hL
DAP 15 g/hL
 

105 + ____ + ____ + ____ = ____

258 mg N/LGoFerm 30 g/hL
Fermaid O 30 g/hL
 

258 + ____ + ____ = ____

378 mg N/LGoFerm 30 g/hL
Fermaid O 25 g/hL
 

378 + ____ + ____ = ____

62 mg N/LGoFerm 30 g/hL
Fermaid K 25 g/hL
DAP 27 g/hL
 

62 + ____ + ____ + ____ = ____

Answers: 132 mg N/L; 211 mg N/L; 170 mg N/L; 280 mg N/L; 398 mg N/L; 151 mg N/L

References

Scott Labs Handbook. Available at: http://www.scottlab.com/pdf/ScottlabsHandbook2017.pdf

Related Items:

Worksheet: Winemaking Goals & Ambitions - 2023
Template: FDA Compliance: Individual Employee Record
Production Guide: General Filtration Guidance
Checklist: Pre-Bottling Prep Timeline for White Wine
Protocol: Volatile Acidity (VA) Analysis

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