Essential knowledge for fermentation industry：what is inactive yeast？
April 22, 2020
1. Types of inactive yeast in fermentation industry
Baker’s inactive yeast, which was developed by Angel, is rich composition of protein, nucleic acid and growth factors from primary grown Saccharomyces cerevisiae
Brewer's yeast is produced from spent yeast in brewing factory. It contains less nutrition and more risks of contamination from other bacteria due to it is a kind of unstable by-product under longer fermentation time which cause inhomogeneous age of yeast cells.
Rich in nucleic acid and mainly used for animal feed materials, generally not for food and lack of certifications
2. Composition of yeast
（1）Protein：45-55%，complete and reasonable profile of amino acids, good for microorganisms assimilation
（2）Nucleic acid：RNA content 6-8%
（3）Vitamin B group
Baker's yeast, Unit（ug/g）
（4）Carbohydrates：Glucan and mannosan in yeast cell wall; Trehalose in cytoplasm
（6）Physiological substances: Coenzyme A, Coenzyme I, Coenzyme Q, ，Cytochrome C, Thromboplastin, Glutathione, Lecithin, Ergosterol, etc.
3. Function of inactive yeast in fermentation industry
（1）Fast or slow release nitrogen source：in bacterial fermentation, such as Bacillus subtilis fermentation, inactive yeast is a kind of slow release nitrogen source and mainly for fermentation stage. But in Actinomycetes and molds fermentation, inactive yeast is a kind of fast release nitrogen source and mainly for seed culture stage.
（2）Adjust morphology of filamentous bacteria and fungus：different inactive yeast can makes hypha stretch and loose, or cluster depends on different application.
（3）Replace some cheap animal origin peptones: in some Actinomycetes and molds fermentation, inactive yeast could be used to replace some cheap animal origin peptone.
4. Angel inactive yeast
Food grade, API fermentation
Chlortetracycline,Neomycin sulfate, oxytetracycline, Spectinomycin
Mycophenolate, Lovastatin, Animal feed
Senior manager of Angel Yeast APAC Division
About Angel Microbial Nutrition：
Angel YE, rich in protein, amino acids, peptides, nucleotides, B vitamins and trace elements. With the advantages of having no allergic source and being non-transgenic, high efficiency and stable quality, Angel YE are widely applied in the biological laboratories and industrial-scale fermentation, promoting the product safety and technical progress in the global fermentation industry.
Angel Yeast Company is a high-tech listed company specializing in yeast and biotech. Product business covers Yeast and Baking, Yeast Extract-Savoury, Nutrition & Health and Biotechnology fields. It is one of the world's leading companies in the yeast industry. Angel has 12 holding subsidiaries and provides products and services for more than 150 countries and regions.
ANGEL YEAST CO., LTD
Address: 168 Chengdong Avenue, Yichang, Hubei 443003, P. R.China