Safety evaluation of the food enzyme xylanase from the genetically modified Aspergillus luchuensis Inui strain RF7398

EFSA J. 2020 Jan 20;18(1):e05971. doi: 10.2903/j.efsa.2020.5971. eCollection 2020 Jan.


The food enzyme xylanase (4-β-d-xylan xylanohydrolase; EC is produced with the genetically modified Aspergillus luchuensis Inui strain RF7398 by AB Enzymes GmbH. The genetic modifications do not give rise to safety concerns. The food enzyme is free from viable cells of the production organism and recombinant DNA. The food enzyme is intended to be used in baking and cereal-based processes. Based on the maximum use levels, dietary exposure to the food enzyme-Total Organic Solids (TOS) was estimated to be up to 0.008 mg TOS/kg body weight (bw) per day in European populations. Genotoxicity tests did not raise a safety concern. The systemic toxicity was assessed by means of a repeated dose 90-day oral toxicity study in rats. The Panel identified a no observed adverse effect level of 1,000 mg TOS/kg bw per day, the highest dose tested, which when compared with the estimated dietary exposure, resulted in a high margin of exposure of at least 125,000. Similarity of the amino acid sequence of the food enzyme to those of known allergens was searched and one match was found. The Panel considered that, under the intended conditions of use, the risk of allergic sensitisation and elicitation reactions by dietary exposure cannot be excluded, but the likelihood of this occurring is considered to be low. Based on the data provided, the Panel concluded that this food enzyme does not give rise to safety concerns under the intended conditions of use.

Keywords: 4‐β‐d‐xylan xylanohydrolase; Aspergillus luchuensis Inui; EC; endo‐14‐β‐xylanase; food enzyme; genetically modified microorganism; xylanase.