Safety evaluation of the food enzyme pullulanase from a genetically modified Bacillus?licheniformis (strain DP‐Dzp39)

摘要

The food enzyme pullulanase (pullulan 6‐α‐glucanohydrolase; EC 3.2.1.41) is produced with a genetically modified Bacillus licheniformis (strain DP‐Dzp39) by Danisco US Inc. The genetic modifications do not give rise to safety concerns. The food enzyme is free from viable cells of the production organism and its recombinant DNA. This pullulanase is intended to be used in brewing processes, starch processing for glucose syrups production and distilled alcohol production. Residual amounts of total organic solids (TOS) are removed by distillation and by the purification steps applied during the production of glucose syrups, consequently, dietary exposure was not calculated for these food processes. For brewery products, based on the maximum use level recommended for the brewing processes and individual data from the EFSA Comprehensive European Food Consumption Database, dietary exposure to the food enzyme–TOS was estimated to be up to 0.053 mg TOS/kg body weight (bw) per day in European populations. Genotoxicity tests with the food enzyme did not raise 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 at the highest dose of 500 mg TOS/kg bw per day that, compared to the estimated dietary exposure, results in sufficiently high margin of exposure (at least 9,400). The amino acid sequence of the food enzyme did not match those of known allergens. The Panel considered that, under the intended condition of use, the risk of allergic sensitisation and elicitation reactions upon dietary exposure to this food enzyme cannot be excluded, but the likelihood is considered low. Based on the data provided, the Panel concluded that this food enzyme does not raise safety concerns under the intended conditions of use.