文章基本信息

标题：Safety evaluation of the food enzyme xylose isomerase from the genetically modified Streptomyces rubiginosus strain DP‐Pzn37
本地全文：下载
作者：Vittorio Silano ; José Manuel Barat Baviera ; Claudia Bolognesi 等
期刊名称：EFSA Journal
印刷版ISSN：1831-4732
出版年度：2020
卷号：18
期号：1
页码：1-12
DOI：10.2903/j.efsa.2020.5978
出版社：European Food Safety Authority (EFSA), Parma
摘要：The food enzyme is a d ‐xylose aldose‐ketose‐isomerase (EC 5.3.1.5) produced with the genetically modified Streptomyces rubiginosus strain DP‐Pzn37 by Danisco US Inc. Although the production strain contains antibiotic resistance genes, the food enzyme was shown to be free from viable cells of the production organism and its DNA. The food enzyme is intended to be used in an immobilised form for the isomerisation of glucose for the production of high fructose syrups. Residual amounts of total organic solids (TOS) are eliminated by the use of an immobilised food enzyme and further removed by the purification steps applied during the production of high fructose syrups using the immobilised enzyme; consequently, dietary exposure was not calculated. Genotoxicity tests did not raise safety concerns. The systemic toxicity was assessed by a repeated dose 90‐day oral toxicity study in rats. The Panel identified a no observed adverse effect level of 85.2 mg TOS/kg body weight (bw) per day, the highest dose tested. Similarity of the amino acid sequence to those of known allergens was searched and no 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 is considered to be low. Based on the data provided, the immobilisation process and the removal of total organic solids during the production of high fructose syrups, the Panel concluded that this food enzyme does not give rise to safety concerns under the intended conditions of use..
关键词：food enzyme;xylose isomerase;glucose isomerase;D‐xylose aldose‐ketose‐isomerase;EC 5.3.1.5;Streptomyces rubiginosus