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Protease for Yeast Nutrition

Top yeast performance requires ample nutrition, with biologically available free amino nitrogen (FAN) being one of the most important.1 Plant feedstocks, while containing protein, lack sufficient FAN to meet the protein requirement of yeast. Thus, external nitrogen sources such as urea and ammonia are used to provide adequate nitrogen during fermentation.

Kemin’s unique fungal acid protease, ZYLOPRO, provides yeast nutrition and can reduce urea requirements to optimize yeast performance and increase the profitability of your ethanol plant.

ZYLOPRO protease is a highly active enzyme that hydrolyzes proteins in the feedstock itself to continually release FAN to boost yeast growth during fermentation, thus reducing urea use.

Kemin provides tailored customer lab services and technical expertise to help you maximize the value of your ingredients. By helping you identify the most efficient application rate of our stand alone ZYLOPRO protease, we can ensure you’re getting the maximum value from your enzymes.

ZYLOPRO is an economical supplemental enzyme:

  • Improves yeast performance
  • Offsets urea additions
  • Concentrated liquid
  • Effective at typical fermentation parameters
  • Non-GMO and Generally Recognized as Safe (GRAS)
  • Available in totes for ease of handling and storage
  • Increase the profitability of your plant 



1Ingledew, M., Nutrition of Yeasts, in The Alcohol Textbook, D. Kelsall, G. Austin, and C. Kluhspies, Editors. 2017. p. 108-109.

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