正常山羊血清（normal goat serum）采自正常健康的山羊供体，经脂质萃取和透析后储存于缓冲液（0.01 M磷酸钠，0.25 M氯化钠, pH 7.6）中。常用于各种免疫实验，起到封闭或对照的作用。

本品用于封闭的常见使用浓度为5%（v/v）。

冻干粉保存于2-8℃。100%原液于2-8℃可稳定保存6周，短时间不用时，建议分装后于≤-20℃保存，有效期1年。避免反复冻融。

Q：该品作为封闭液的话，常用浓度是多少？

A：5%。

Q：原液可以直接使用吗？

A：可以。

Q：冻干粉的话用什么溶解？

A：5 mL 蒸馏水即得 100％原液。

Q：该品有效期是多久，4℃保存可以放多久，-80℃保存是否对其有影响？

A：建议配成的标准品放置 4℃不要超过 1 个月，-80℃对其没有影响，有效期为 1 年， 避免反复冻融。

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