Validation results of the three used methods, both LC-MS/MS methods are validated without correction for the internal standard D3BMAA.

LOD: limit of detection, LOQ: limit of quantification, RT: retention time,aeach concentration is injected in triplicate,bn = 11,*not determined (see text).LOD：检测限（limit of detection），LOQ：定量限（limit of quantification），RT：保留时间（retention time）；每个浓度均进行三次重复进样，样本量n=11，*未测定（详见正文）。