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GIBCO胎牛血(xue)清10270-106代理商是哪家?購買正(zheng)品10270-106胎牛血清(qing)shou選上海慧穎(ying)生(sheng)物,多年的(de)渠道(dao),一直專注(zhu)細胞(bao)培(pei)養,7年來從未改變(bian),品質不(bu)變(bian),價格不(bu)變(bian),服務一如既往,想要細胞(bao)滿滿的(de)幸福,找慧穎(ying)公司就對(dui)了!
產品名稱:胎牛(niu)血清
品牌:GIBCO
貨號:10270-106
規格(ge):500ML
市場價(jia)格:2600元
優惠價格:咨詢市場部
內毒素(su):0.4EU/ML
用途(tu):適合腫瘤細胞,原(yuan)代細胞的培(pei)養(yang)
庫存狀態:現(xian)貨
收到(dao)血(xue)清后血(xue)清中因(yin)含(han)有(you)(you)許多蛋白質,反復凍融對蛋白的活性肯定會有(you)(you)一定的影響,這似乎已*。因(yin)此,如果幾次內用不完,應(ying)盡量分裝,這不僅適(shi)用于血(xue)清,也適(shi)用于其(qi)他儲(chu)存于-20℃的蛋白質類產品(pin)。
曾有(you)研究發現(xian),血(xue)(xue)清(qing)(qing)凍(dong)融(rong)(rong)(rong)三(san)次(ci)(ci)(ci),對(dui)腫(zhong)瘤標(biao)志物的(de)(de)(de)(de)濃度(du)影(ying)(ying)響(xiang)不(bu)大,對(dui)于(yu)血(xue)(xue)漿,有(you)報道(dao)在短時(shi)間(jian)內反(fan)復(fu)凍(dong)融(rong)(rong)(rong)三(san)次(ci)(ci)(ci),對(dui)總蛋(dan)(dan)(dan)白(bai)、白(bai)蛋(dan)(dan)(dan)白(bai)和(he)免疫球蛋(dan)(dan)(dan)白(bai)含(han)量(liang)影(ying)(ying)響(xiang)不(bu)大,但(dan)作者(zhe)推(tui)測對(dui)免疫球蛋(dan)(dan)(dan)白(bai)的(de)(de)(de)(de)活性有(you)影(ying)(ying)響(xiang)2。zui重要的(de)(de)(de)(de)是(shi)(shi)一篇西(xi)北民族學院的(de)(de)(de)(de)文章,《反(fan)復(fu)凍(dong)融(rong)(rong)(rong)新生(sheng)牛(niu)(niu)血(xue)(xue)清(qing)(qing)對(dui)促(cu)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)生(sheng)長(chang)效(xiao)應的(de)(de)(de)(de)影(ying)(ying)響(xiang)》,作者(zhe)針對(dui)SP2/0細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao),用MEM培養(yang)基和(he)三(san)批新生(sheng)牛(niu)(niu)血(xue)(xue)清(qing)(qing)進行培養(yang)。血(xue)(xue)清(qing)(qing)分別凍(dong)融(rong)(rong)(rong)4次(ci)(ci)(ci)至(zhi)28次(ci)(ci)(ci)不(bu)等(deng)。然后繪制細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)生(sheng)長(chang)曲(qu)線,根據公式(shi)t =T/A , A=log2 Y/X計算(suan)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)倍(bei)增時(shi)間(jian)(t 為(wei)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)倍(bei)增時(shi)間(jian), Y 為(wei)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)峰值前1 d 的(de)(de)(de)(de)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)數(shu), X 為(wei)接種(zhong)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)數(shu), T 為(wei)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)生(sheng)長(chang)時(shi)間(jian))。結果顯示:選用的(de)(de)(de)(de)三(san)批新生(sheng)牛(niu)(niu)血(xue)(xue)清(qing)(qing)在反(fan)復(fu)凍(dong)融(rong)(rong)(rong) 28 次(ci)(ci)(ci)時(shi), 血(xue)(xue)清(qing)(qing)促(cu)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)生(sheng)長(chang)的(de)(de)(de)(de)zui大增殖(zhi)(zhi)量(liang)變化(hua)不(bu)大,均高于(yu)1×106/mL, 但(dan)是(shi)(shi)血(xue)(xue)清(qing)(qing)促(cu)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)生(sheng)長(chang)的(de)(de)(de)(de)倍(bei)增時(shi)間(jian)在反(fan)復(fu)凍(dong)融(rong)(rong)(rong) 20次(ci)(ci)(ci)時(shi)延長(chang), 即血(xue)(xue)清(qing)(qing)促(cu)細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)繁(fan)殖(zhi)(zhi)一代(dai)所需(xu)的(de)(de)(de)(de)時(shi)間(jian)在凍(dong)融(rong)(rong)(rong)次(ci)(ci)(ci)數(shu)達到 20 次(ci)(ci)(ci)時(shi)顯著增加。筆者(zhe)觀察了一下該(gai)文章的(de)(de)(de)(de)結果列表,發現(xian)在凍(dong)融(rong)(rong)(rong)20次(ci)(ci)(ci)之(zhi)前,細(xi)(xi)(xi)(xi)(xi)胞(bao)(bao)(bao)(bao)(bao)倍(bei)增時(shi)間(jian)延長(chang)2-3小(xiao)時(shi)不(bu)等(deng),20次(ci)(ci)(ci)時(shi),則延長(chang)3-4小(xiao)時(shi)。可見,影(ying)(ying)響(xiang)還是(shi)(shi)比較顯著的(de)(de)(de)(de)。該(gai)文章的(de)(de)(de)(de)局限是(shi)(shi)針對(dui)新生(sheng)牛(niu)(niu)血(xue)(xue)清(qing)(qing),而(er)沒有(you)對(dui)胎(tai)牛(niu)(niu)血(xue)(xue)清(qing)(qing)進行測試。
國外(wai)有(you)人對(dui)大鼠血清(qing)中(zhong)的18種化學(xue)成分進行了檢測,發現反復(fu)凍(dong)融3次對(dui)其中(zhong)的14種成分沒有(you)顯著影(ying)響,其他肌(ji)酸激酶,甘(gan)油三酯,葡萄糖,膽紅素,甚(shen)至包括氯離子有(you)一些明顯變化,但其濃度變化控制(zhi)在10%以內。
總而言之(zhi),如果(guo)(guo)能(neng)避(bi)免牛血(xue)清(qing)(qing)的(de)反復凍融(rong)(rong),及時分裝,那(nei)是(shi)的(de)。如果(guo)(guo)在(zai)短時間(jian)內有幾次反復凍融(rong)(rong),也(ye)不(bu)用過(guo)(guo)于(yu)擔心。但是(shi),對于(yu)胎牛血(xue)清(qing)(qing),還有一(yi)個問題(ti),是(shi)反復凍融(rong)(rong)增高了血(xue)清(qing)(qing)產(chan)生沉(chen)(chen)淀(dian)或渾濁的(de)風險(xian)。因(yin)為血(xue)清(qing)(qing)在(zai)融(rong)(rong)化(hua)(hua)時,冰塊和蛋白融(rong)(rong)化(hua)(hua)的(de)速度是(shi)不(bu)一(yi)樣的(de),局部可能(neng)因(yin)蛋白濃度過(guo)(guo)高而產(chan)生沉(chen)(chen)淀(dian)。同時,如果(guo)(guo)血(xue)清(qing)(qing)內含有少(shao)量纖維蛋白原,那(nei)么在(zai)低溫下也(ye)可以(yi)形(xing)成絮狀沉(chen)(chen)淀(dian),等到血(xue)清(qing)(qing)再融(rong)(rong)化(hua)(hua)時,沉(chen)(chen)淀(dian)就顯(xian)現出來了。所以(yi),血(xue)清(qing)(qing)的(de)質量也(ye)非常重要(yao)。
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MILLIPORE ECL底(di)物發(fa)光試(shi)劑盒100ml WBKLSO100 GIBCO胎牛血清10270-106代理商是哪家?找慧穎