经过评估，专家小组认为该添加剂对消费者和环境是安全的。在缺乏数据的情况下，专家小组无法就该添加剂作为皮肤、眼睛刺激物或皮肤敏化剂的可能性得出结论。评估中的添加剂被认为是非反刍动物物种氨基酸L-苏氨酸的有效来源。为了使补充的L-苏氨酸对反刍动物和非反刍动物同样有效，需要防止其在瘤胃中降解。部分原文报道如下：

 

　　Following a request from the European Commission, the Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on l‐threonine produced by fermentation when used as a nutritional additive in feed and water for drinking for all animal species and categories. The product under assessment is l‐threonine produced using a genetically modified strain of E. coliCGMCC 13325. The Panel notes that three out of five batches of the additive do not comply with the minimum specification of 98.5% l‐threonine on a dry matter basis proposed by the applicant. The production strain and its DNA were not detected in the final additive. Therefore, the final product does not give raise to any safety concern regarding the genetic modification of the production strain. The use of l‐threonine produced using E. coliCGMCC 13325 in supplementing feed to compensate for threonine deficiency in feedingstuffs is safe for the target species. The FEEDAP Panel identified risks of nutritional imbalances and hygienic concerns for amino acids when administered simultaneously in feed and in water for drinking. The use of l‐threonine produced by fermentation using E. coliCGMCC 13325 in animal nutrition is considered safe for the consumers and for the environment. There is a risk from the inhalation exposure to endotoxins for persons handling the additive. In the absence of data, the FEEDAP Panel cannot conclude on the potential of l‐threonine produced using E. coliCGMCC 13325 to be a skin or eye irritant or a skin sensitiser. The additive under assessment is regarded as an effective source of the amino acid l‐threonine for all non‐ruminant species. For the supplemental l‐threonine to be as efficacious in ruminants as in non‐ruminant species, it requires protection against degradation in the rumen.

 

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