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Can self-prepared PBS, aliquoted and sterilized, be used for rabbit perfusion fixation?

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Asked by:TubeZone3890 2026-08-08 Views 197 4 answers
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All Answers4
郑
郑琳 2026-09-11
自己配PBS再高压,pH漂移是常见现象。磷酸盐缓冲对高压后通常会有小幅变化,可能偏高或偏低,取决于水质和瓶盖密封。建议配好后先分装到可高压瓶中,盖松一点灭菌,冷却后取一小瓶测pH;若在7.3-7.6范围内,灌流一般可接受。不要默认高压前后一样,每批都要复测。
F
FlaskLab 2026-09-19
灌流固定用的PBS不建议加叠氮钠。叠氮钠有毒性,操作时容易污染台面,还可能影响后续固定、免疫组化或酶活性检测。PBS本身没有易降解成分,高压灭菌即可;如果后续要做超微结构或活细胞相关检测,可以考虑用0.22 µm滤器过滤除菌。但过滤在普通环境下操作更容易二次污染,不如高压后密闭使用。
W
WendyScience4079 2026-09-23
动物房没有洁净台,分装污染风险要重视。灌流液体不一定要求达到细胞培养级无菌,但大量进入血管系统,细菌和热原太多可能干扰动物状态。建议不要让PBS敞口暴露,灭菌后盖紧,使用时通过无菌输液器或注射器抽取;分装最好移到细胞间超净台或生物安全柜中做,普通台面擦拭酒精只能减少表面菌,不能替代洁净环境。
T
Tom441 2026-09-16
品牌与货期:干粉PBS优先选供货稳定的常见品牌,比如Thermo/Gibco、Cytiva/HyClone、索莱宝等,国产现货通常3-7天,进口可能2-4周。采购时要求提供COA,重点看pH、渗透压和重金属/内毒素指标。买干粉可以固定一个批次多备几瓶,避免实验中途换批导致对照波动。
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