Tick the specs you need to submit them together; or enquire one by one. Cat. numbers are carried into the RFQ.
Q:血清融化后有细沙状的沉淀,是什么呢?
A:血液中的钙离子部分与磷酸结合形成磷酸钙沉淀,血清是来源于血液,血清中也有磷酸钙存在,尤其在37°C培养的时候会增加,会造成血清的浑浊,这种沉淀物在倒置显微镜下观察像小黑点,并且由于布朗运动看上去像在活动,因此经常被误认为是微生物污染。磷酸钙沉淀是不影响使用的,可以1000-2000rpm,离心10 min去除。
Q:解冻后血清中有悬浮物质/絮状沉淀,是什么原因呢?需要怎样处理?
A:血清中沉淀物的出现有许多种原因,但最普遍的原因是由于血清中脂蛋白的变性所造成,而血纤维蛋白(形成凝血的蛋白之一)在血清解冻后,也会存在于血清中,亦是造成沉淀物的主要原因之一。但这些絮状沉淀物,并不影响血清本身的质量。
欲去除这些絮状沉淀物,可以将血清分装至无菌离心管内,以400 g稍微离心,上清液即可接着加入培养基内一起过滤。我们不建议您以过滤的方法去除这些絮状物,因为它可能会阻塞您的过滤膜。我们建议您在使用血清的时候,注意正确的血清解冻步骤,并尽量避免灭活血清及长时间的将血清置于高温环境中。
Q:血清正确的溶解方式及灭火方法?
A:-20℃拿出血清后放置于2℃至8℃冰箱中过夜,融化过程中可以混匀几次。完全融化的血清可以放到室温恢复到室温,然后直接分装,把血清放在 37℃ 环境中,又会使此沉淀物更增多。如果是做普通的细胞培养实验不建议灭活处理,如果必须灭火处理可以56℃水浴30 min处理,融化过程中摇匀几次,灭火的影响如下。
Q:血清融化后有必要灭火吗?
A:大多数的细胞而言是不需要灭火的。经此处理过的血清对细胞的生长只有微小的促进,或完全没有任何作用,甚至通常因为高温处理影响了血清的质量,而造成细胞生长速率的降低。而经过热处理的血清,沉淀物的形成会显著的增多, 这些沉淀物在倒立显微镜下观察,像是 "小黑点",常常会让研究者误以为是血清污染。
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