Question Detail
How much does DMSO residue in monoclonal antibody purification samples affect mouse tail vein injection?
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All Answers4
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Kit9816
2026-09-10
小鼠精神不好不一定只是DMSO,单抗制剂中的组氨酸、蔗糖、吐温80、pH、渗透压或抗体本身的免疫原性都可能影响。建议设溶剂对照组和空白缓冲液组,观察精神和活动;若溶剂对照也异常,说明DMSO或缓冲液需要调整。用顶空GC或HPLC检测DMSO残留,同时测内毒素,因为内毒素和DMSO叠加会加重动物反应。
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LilyAssay1218
2026-09-10
尾静脉注射对DMSO比口服或腹腔更敏感,一般建议终制剂DMSO浓度控制在1%以下,更稳妥是0.5%以下;如果剂量大或连续给药,可能需要低于0.1%。这些不是法规限值,而是经验安全窗口。建议先用含不同浓度DMSO的缓冲液做尾静脉溶剂对照,观察小鼠精神状态、尾部血管反应和活动度;同时送检测DMSO残留,再根据结果设定可接受范围。
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OscarCell5328
2026-09-17
如果纯化样品中DMSO残留超过0.5%~1%,建议增加透析或超滤换液,但不一定要追求“检测不到”。目标应是降到安全阈值以下,并保持单抗稳定。样品量小可用透析袋,换外液2~3次;样品量大或浓度高可用超滤离心管或膜包。处理前后分别测DMSO残留和蛋白回收率,避免为了去除DMSO造成聚集体增加或蛋白损失。
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邓敏伟4082
2026-09-17
单抗分子量约150kDa,透析袋截留分子量选10~20kDa比较稳妥,既能让DMSO透过,也不容易漏抗体;50kDa虽然理论上也能截留,但若存在片段或膜孔径偏差,风险稍高。优先选低吸附再生纤维素膜,浸泡在缓冲液中预处理。超滤可选30kDa膜包,但要注意剪切和浓缩倍数。透析外液体积建议足够大,换液2~3次比一次大体积更有效。
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