Abstract
Mannanase 19287 enzyme is an engineered β-mannanase that can be added to diets for animals raised for human consumption to hydrolyze β-mannans. Established toxicological analyses were conducted with the enzyme preparation to ensure the safety of this product for the intended use. The mannanase 19287 preparation was produced with Thermothelomyces thermophilus strain DSM 33149. In vitro toxicity studies presented here used dosages of the mannanase 19287 test articles up to 5000 μg/plate. For in vivo toxicity studies in Wistar rats, test articles were administered at 5.1 mg/L for inhalation toxicity and up to 15,000 mg/kg rat feed for oral toxicity, based on the Total Organic Solids (TOS) content in each test article. No treatment related adverse effects were reported in any study. The No Observed Adverse Effect Levels in the high dose group of the subchronic oral toxicity study were calculated as 1117–1298 mg TOS/kg bw/day in rats. Comparing these values to an Estimated Daily Intake for poultry demonstrated safety factors larger than 5000. Our results confirm that T. thermophilus fulfills the recognized safety criteria for the manufacture of food enzyme preparations and represent the first peer-reviewed safety evaluation of an enzyme preparation by T. thermophilus. The results of the toxicity studies presented herein attest to the safety of the mannanase 19287 enzyme for its intended use.
Highlights
Mannanases are enzymes capable of hydrolyzing mannans as either exo- or endo- glucanases [1]
Since test article spray-dried powder (SD) is produced from RB5, the determination of antimicrobial activity and absence of the production organism (APO) was not repeated
The results confirm that the test articles comply with the microbial and chemical specifications established for enzyme preparations used in food processing, as published in the Food Chemical Codex (FCC), Eleventh Edition, 2018 [24], and by the Joint FAO/WHO Expert Committee on Food Additives (JECFA, 2006) [25]
Summary
Mannanases are enzymes capable of hydrolyzing mannans as either exo- (cleaving the terminal saccharides) or endo- (cleaving randomly within the polysaccharide chain) glucanases [1]. Endo-1,4-β-mannanases (E.C. 3.2.1.78) [2] are a class of glycosyl hydrolases that catalyze the random hydrolysis of (1!4)-β-D-mannosidic linkages in mannans, and galactomannans. Endo-1,4-β-mannanases are produced by a variety of organisms, including prokaryotes such as Bacillus subtilis and Paenibacillus lentus (formerly named Bacillus lentus), as well as eukaryotes, including fungi, such as Aspergillus niger and Trichoderma reesei [3]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call