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當前位置:首頁 > 技術(shù)文章 > 血清的這些常識你知道嗎?

血清的這些常識你知道嗎?

2022-03-08 瀏覽次數(shù):1731

牛血清是細胞培養(yǎng)中用量大的天然培養(yǎng)基,含有豐富的細胞生長必須的營養(yǎng)成份,常用于動物細胞的體外培養(yǎng),具有極為重要的功能。

一、血清的成分

血清是由血漿去除纖維蛋白而形成的一種很復雜的混合物,其組成成份雖大部分已知,但還有一部分尚不清楚,且血清組成及含量常隨供血動物的性別、年齡、生理條件和營養(yǎng)條件不同而異。血清中含有各種血漿蛋白、多肽、脂肪、碳水化合物、生長因子、激素、無機物等,這些物質(zhì)對促進細胞生長或抑制生長活性是達到生理平衡的。

二、血清的功能

1.提供對維持細胞指數(shù)生長的激素,基礎(chǔ)培養(yǎng)基中沒有或量很少的營養(yǎng)物,以及主要的低分子營養(yǎng)物。

2. 提供結(jié)合蛋白,能識別維生素、脂類、金屬和其他激素等,能結(jié)合或調(diào)變它們所結(jié)合的物質(zhì)活力。

3.有些情況下結(jié)合蛋白質(zhì)能與有毒金屬和熱原質(zhì)結(jié)合,起到解毒作用。

4.是細胞貼壁、鋪展在塑料培養(yǎng)基質(zhì)上所需因子來源。

5.起酸堿度緩沖液作用。

6.提供蛋白酶抑制劑,使在細胞傳代時使剩余胰蛋白酶失活,保護細胞不受傷害。

三、不同血清之間的差異

市場上各種血清產(chǎn)品角龍混珠,一不小心,你可能就使用了品質(zhì)不好的血清。血清按照采血時間可分為胎牛血清,新生牛血清和小牛血清,三者的優(yōu)劣順序為:胎牛,血清>新生牛血清>小牛血清。

一般細胞建議使用胎牛血清培養(yǎng),部分細胞可使用新生牛血清培養(yǎng),小牛血清則不建議用于細胞培養(yǎng)。

四、血清選購的注意事項

1.產(chǎn)品關(guān)鍵指標

(1)低內(nèi)毒素

內(nèi)毒素是所有細胞培養(yǎng)的大敵,對細胞培養(yǎng)的影響性早在將近三十年前就被廣泛討論和重視.。內(nèi)毒素會改變細胞外形,影響下游生物途徑反應,抑制酵素活性等,低內(nèi)毒素對細胞培養(yǎng)作用重大。

(2)血紅蛋白

根據(jù)血紅蛋白含量的不同表現(xiàn)出黃色、淡黃色、橘紅色、微紅色等。細胞培養(yǎng)用血清的標準是血紅蛋白含量不高于20mgldL,顏色越紅,數(shù)值越高;反之,數(shù)值越低。品質(zhì)好的一般呈琥珀色,偏紅一般生產(chǎn)工藝較差

(3)微生物指標

包括細菌、霉菌、支原體、噬菌體、各類病原性病毒等

2.細胞增殖能力

每個產(chǎn)品針對的細胞不一樣,產(chǎn)品出廠前都會經(jīng)過細胞實驗驗證,Corning的幾款血清都是經(jīng)過四種細胞檢測,并且通過多種病毒檢測。Bovogen是澳洲本土血清品牌,位于澳大利亞墨爾本,要知道澳大利亞和新西蘭是世界上血源等級很好的地方,尤其是新西蘭,是世界上潔凈的牛血清源地。

3.產(chǎn)品批次

因為血清來源于動物,其組成成分有1000種左右,每個批號的組分和組分含量都是不固定的,因此批間差異是可能存在的。

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