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Vo TD, Meetro J, Floyd S, Lynch B, Tafazoli S, Ichihara A, Chikamatsu G. Safety assessment of purine nucleosidase from Aspergillus luchuensis. TOXICOLOGY RESEARCH AND APPLICATION 2021. [DOI: 10.1177/23978473211061428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Purine nucleosidase (EC 3.2.2.1) catalyzes the N-riboside hydrolysis of purine nucleosides to D-ribose and a purine base. This enzyme may be used in the production of beer and other alcoholic beverages to reduce the purine content of these products. Purine nucleosidase was obtained from Aspergillus luchuensis naturally occurring in grain sources. The safety profile of purine nucleosidase is not well documented in the scientific literature, and a series of toxicological studies were undertaken to investigate the safety of its use in food production. Purine nucleosidase from A. luchuensis was non-mutagenic and non-clastogenic in a standard Ames test and in vitro mammalian chromosome aberration assay. Administration of purine nucleosidase in a 90-day subchronic toxicity study in Sprague-Dawley rats did not elicit adverse findings on any hematology, clinical chemistry, urinalysis, organ weight, or histopathological parameter at doses up to 1700 mg total organic solids (TOS)/kg body weight/day, the highest dose tested. The results suggest purine nucleosidase to lack systemic toxic effect. The no-observed-adverse-effect level was concluded to be 1700 mg TOS/kg body weight/day. The results of the toxicology studies support the safety of purine nucleosidase from a non-genetically modified strain of A. luchuensis when used in food production.
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Affiliation(s)
- Trung D Vo
- Intertek Health Sciences Inc., Mississauga, ON, Canada
| | - Jwar Meetro
- Intertek Health Sciences Inc., Mississauga, ON, Canada
| | - Seth Floyd
- Intertek Health Sciences Inc., Mississauga, ON, Canada
| | - Barry Lynch
- Intertek Health Sciences Inc., Mississauga, ON, Canada
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