非轉基因塔賓曲霉菌株LYX生產內切1,4β木聚糖酶安全性

　　2023年7月12日，歐盟食品安全局就一種食品酶內切-1,4-β-木聚糖酶（endo-1,4-β-xylanase）的安全性評價發布意見。

　　據了解，這種食品酶是由非轉基因塔賓曲霉菌株LYX生產的，旨在用于烘焙過程和基于谷物的過程。

　　經過評估，專家小組認為，在預期的使用條件下，不能排除通過飲食接觸引起過敏反應的風險，但這種情況發生的可能性很低。根據所提供的數據，小組得出結論，該食品酶在預期的使用條件下不會引起安全問題。部分原文報道如下：

　　The food enzyme endo-1,4-β-xylanase (4-β-d-xylan xylanohydrolase, EC 3.2.1.8) is produced with the non-genetically modified microorganism Aspergillus tubingensis strain LYX by DSM Food Specialties B.V. The food enzyme was considered free from viable cells of the production organism. It is intended to be used in baking processes and cereal-based processes. Dietary exposure to the food enzyme–total organic solids (TOS) was estimated to be up to 0.106 mg TOS/kg body weight (bw) per day in European populations. Genotoxicity tests did not indicate 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 227 mg TOS/kg bw per day, the highest dose tested, which when compared with the estimated dietary exposure, resulted in a margin of exposure of at least 2,142. A search for the similarity of the amino acid sequence of the food enzyme to known allergens was made and no match was found. The Panel considered that, under the intended conditions of use, the risk of allergic reactions by dietary exposure cannot be excluded, but the likelihood is 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.