天然蛋白质和水解天然蛋白质聚合物是否符合 REACH 法规的定义？

天然蛋白质和水解天然蛋白质聚合物是否符合 REACH 法规的定义？

Are natural proteins and hydrolysed natural proteins polymers as defined in the REACH Regulation?

根据 REACH，天然蛋白质可被视为聚合物，前提是其至少含有 50% 的聚合物分子（在这种情况下，分子包含至少四个氨基酸单体单元的序列），且具有相同分子量的分子含量保持在 50% 的重量百分比以下。同样，如果水解天然蛋白质符合上述标准，也可被视为聚合物。如果水解程度达到物质重量的 50% 以下由聚合物分子（定义见《单体和聚合物指南》第 2.2 章）组成，和/或具有相同分子量的聚合物分子含量至少为 50% 的重量百分比，则水解天然蛋白质不属于聚合物，因此不属于 REACH 聚合物注册豁免的范畴。

Natural proteins may be considered as polymers under REACH provided that they have at least 50 weight percent of polymer molecules (in this case, molecules including a sequence of at least four amino acid monomer units) and the content of molecules presenting the same molecular weight remains below 50 weight percent.Similarly, hydrolysed natural proteins may be considered as polymers if they fulfil the above mentioned criteria. If the degree of hydrolysis is to such an extent that less than 50 percent of the weight of the substance consists of polymer molecules (as defined in chapter 2.2 of the Guidance for monomers and polymers) and/or the amount of polymer molecules presenting the same molecular weight is at least 50 weight percent, the hydrolysed natural protein is not a polymer and, hence, is not covered by the registration exemption for polymers under REACH.