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#f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>智能蛋白純化系統(tǒng),蛋白純化系統(tǒng)</p><p><span>***更新：</span>2020-11-22 04:02:57</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="8ryvctl" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">蘇州英賽斯智能科技有限公司</a></p><p><span>聯(lián)系人：</span>李大為</p><p><span>郵箱: </span>570745634@qq.com</p><p><span>電話: </span>18606243033</p><p><span>傳真: </span>0512_63937379</p><p><span>網(wǎng)址: </span>http://www.inscinstech.com.cn</p><p><span>手機: </span>0512-63937378</p><p><span>地址: </span>吳江經(jīng)濟技術開發(fā)區(qū)聯(lián)楊路南側、龍橋路西側</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="22xpm3h" class="page-proshow02"><p class="title">詳細說明</p><div id="kjbtvmj" class="box"><p><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.2 蛋白質的抽提通常選擇適當?shù)木彌_液溶劑把蛋白質提取出來。抽提所用緩沖液的pH、離子強度、組成成分等條件的選擇應根據(jù)欲制備的蛋白質的性質而定。如膜蛋白的抽提，抽提緩沖液中一般要加入表面活性劑（十二烷基磺酸鈉、tritonX-100等），使膜結構破壞，利于蛋白質與膜分離。在抽提過程中，應注意溫度，避免劇烈攪拌等，以防止蛋白質的變性。 2.3蛋白質粗制品的獲得選用適當?shù)姆椒▽⑺牡鞍踪|與其它雜蛋白分離開來。比較方便的有效方法是根據(jù)蛋白質溶解度的差異進行的分離。常用的有下列幾種方法： 1. 等電點沉淀法不同蛋白質的等電點不同，可用等電點沉淀法使它們相互分離，智能蛋白純化系統(tǒng)。 2. 鹽析法不同蛋白質鹽析所需要的鹽飽和度不同，智能蛋白純化系統(tǒng)，所以可通過調(diào)節(jié)鹽濃度將目的蛋白沉淀析出。被鹽析沉淀下來的蛋白質仍保持其天然性質，并能再度溶解而不變性。 3. 有機溶劑沉淀法中性有機溶劑如乙醇、**，它們的介電常數(shù)比水低。能使大多數(shù)球狀蛋白質在水溶液中的溶解度降低，進而從溶液中沉淀出來，因此可用來沉淀蛋白質。此外，有機溶劑會破壞蛋白質表面的水化層，促使蛋白質分子變得不穩(wěn)定而析出。由于有機溶劑會使蛋白質變性，智能蛋白純化系統(tǒng)，使用該法時，要注意在低溫下操作.智能蛋白純化系統(tǒng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="智能蛋白純化系統(tǒng),蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171674741306/6371381716747413062985954.jpg"></div><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.4.2 纖維素柱層析法該法是利用蛋白質的酸堿性質作為分離的基礎。離子交換纖維素（cellulose ion-exchanger）是人工合成的纖維素衍生物，它具有松散的親水性網(wǎng)狀結構，有較大的表面積，使蛋白質大分子可以自由通過。因此常用于蛋白質的分離。（1）羧甲基纖維素（CM-纖維素）在纖維素顆粒上帶有羧甲基基團。在中性pH條件下，羧甲基上的質子可解離下來（圖2-27a），而溶液中帶正電荷的蛋白質分子可與纖維素顆粒上的羧甲基負電荷結合?？山粨Q的基團帶正電，因此是一種陽離子交換劑。蛋白質與離子交換纖維素之間結合能力的大小取決于彼此間相反電荷基團之間靜電吸引。 (2）二乙氨基乙基纖維素（DEAE-纖維素）在中性pH條件下，它含有帶正電荷的基團，可與溶液中的帶負電荷的蛋白質結合，可交換的基團帶負電荷，因此是一種陰離子交換劑。當某一蛋白質混合溶液通過裝有DEAE-纖維素的層析柱時，帶正電荷的蛋白質不能結合而隨著洗脫液的流動先被洗脫下來。帶負電荷的蛋白質將被結合到柱上。結合力取決于彼此相反電荷基團間的靜電吸引。然后選用一定pH和離子強度的緩沖液進行洗脫，改變蛋白質分子所帶的靜電荷，依次從層析柱流出達到相互分離的目的。樣品前處理化學分析蛋白純化系統(tǒng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="智能蛋白純化系統(tǒng),蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2019/9/637045690922656965/6370456909226569652375876.png"></div><p style="text-indent:25px">蛋白質分離純化步驟蛋白質分離純化的一般原則：大多數(shù)蛋白質在組織細胞中都是和核酸等生物分子結合在一起，而且每種類型的細胞都含有成千上萬種不同的蛋白質。許多蛋白質在結構、性質上有許多相似之處，所以蛋白質的分離提純是一項復雜的工作。到目前為止，還沒有一**成的方法能把任何一種蛋白質從復雜的混合物中提取出來。但是對于任何一種蛋白質都有可能選擇一種較合適的分離純化程序以獲得高純度的制品。且分離的關鍵步驟、基本手段還是共同的。蛋白質提純的目的是增加產(chǎn)品的純度和產(chǎn)量，同時又要保持和提高產(chǎn)品的生物活性。因此，要分離純化某一種蛋白質，首先應選擇一種含目的蛋白質較豐富的材料。其次，應設法避免蛋白質變性，以制備有活性的蛋白質。對于大多數(shù)蛋白質來說，純化操作都是在0～4℃的低溫下進行的。同時也應避免過酸、過堿的條件以及劇烈的攪拌和振蕩。另外，還要設法除去變性的蛋白質和其它雜蛋白，從而達到增加純度和提高產(chǎn)量的目的。</p><p style="text-indent:25px">蛋白質分離純化步驟（二）分離純化蛋白質的一般程序 2.1 材料的預處理及細胞破碎分離提純某一種蛋白質時，首先要把蛋白質從組織或細胞中釋放出來并保持原來的天然狀態(tài)，不喪失活性。所以要采用適當?shù)姆椒▽⒔M織和細胞破碎。常用的破碎組織細胞的方法有： 1. 機械破碎法這種方法是利用機械力的剪切作用，使細胞破碎。常用設備有，高速組織搗碎機、勻漿器、研缽等。 2. 滲透破碎法這種方法是在低滲條件使細胞溶脹而破碎。 3. 反復凍融法生物組織經(jīng)凍結后，細胞內(nèi)液結冰膨脹而使細胞脹破。這種方法簡單方便，但要注意那些對溫度變化敏感的蛋白質不宜采用此法。 4. 超聲波法使用超聲波震蕩器使細胞膜上所受張力不均而使細胞破碎。 5. 酶法如用溶菌酶破壞微生物細胞等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="智能蛋白純化系統(tǒng),蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171877557587/6371381718775575877865772.jpg"></div><p> 蛋白質純化方法-親和層析親和層析法包括特異性配體親和層析法以及通用性配體親和層析法。比較這兩種親和層析法。特異性配體親和層析法通常將復雜的生命大分子物質作為配體，它的結合力比較大河吸附選擇性比較強。而通用性配體親和層析法通常將簡單的小分子物質作為配體，因此，它具有低廉的成本，吸附容量比較高，通過對吸附和脫附條件的改善能夠使得層析的分辨率提高。原理親和層析的原理類似于酶-底物，***-受體與抗原-抗體等特異性反應的機理。有一定的親和力在每對反應物之間。與在酶與底物的反應中，只有特異的底物才可以結合一定的酶，使復合物產(chǎn)生相同。在親和層析中，只有特異的配體才可以和一定的生命大分子有親和力，并且使復合物產(chǎn)生。親和層析配體呈固相，而酶與底物的反應底物呈液相是它們的不同點。事實上，親和層析是在含有活化基團的基質M上以共價鍵的方式固化具有識別能力的配體L，將固相載體制作成功而固化后的配體束縛特異物質的能力依然保持。所以當在小層析柱裝入固相載體，使得欲分離的樣品在該柱經(jīng)過。此時，樣品中對配體有親和力的物質S就能夠通過結構互補效應、范德瓦爾力與靜電引力等作用在固相載體上吸附著。北京專業(yè)蛋白純化系統(tǒng)制造廠家</p><p style="text-indent:25px">智能蛋白純化系統(tǒng)</p><p style="text-indent:25px">蛋白質分離純化步驟（二） 2.4 樣品的進一步分離純化用等電點沉淀法、鹽析法所得到的蛋白質一般含有其他蛋白質雜質，須進一步分離提純才能得到有一定純度的樣品。常用的純化方法有：凝膠過濾層析、離子交換纖維素層析、親和層析等等。有時還需要這幾種方法聯(lián)合使用才能得到較高純度的蛋白質樣品。 1. 凝膠過濾層析凝膠過濾層析（gel-filtration chromatography）又稱為分子排阻層析或分子篩層析。它是將葡聚糖凝膠（Sephadex）裝入一個柱子中，制成凝膠柱。這種凝膠顆粒具有網(wǎng)狀結構，不同類型凝膠的網(wǎng)孔大小不同。當把蛋白質混合樣品加到凝膠柱中時，比凝膠網(wǎng)孔小的蛋白質可進入網(wǎng)孔內(nèi)，而大于網(wǎng)孔的分子則不能進入被排阻在凝膠顆粒之外。當用洗脫液洗脫時，被排阻的分子量大的蛋白質直接通過凝膠之間的縫隙先被洗脫下來，而比網(wǎng)孔小的蛋白質可連續(xù)不斷地進入網(wǎng)孔內(nèi)。這樣的小分子不但流經(jīng)的路程長，而且受到來自凝膠內(nèi)部的阻力也很大，所以蛋白質越小，從柱子上洗脫下來所需時間越長。由于不同蛋白質的分子大小不同，進入網(wǎng)孔的程度不同，因此流出的速度不同，洗脫所用體積及時間不同，從而達到分離的目的。智能蛋白純化系統(tǒng)</p><p style="text-indent:25px">蘇州英賽斯智能科技有限公司總部位于吳江經(jīng)濟技術開發(fā)區(qū)聯(lián)楊路南側、龍橋路西側，是一家機器人與自動化設備、機械電子設備的研發(fā)、生產(chǎn)、銷售及技術咨詢；光學檢測設備、光電產(chǎn)品研發(fā)、制造、銷售；實驗室設備、儀器儀表的研發(fā)、制造、銷售及提供相關的技術咨詢和售后服務；自營和代理各類商品及技術的進出口業(yè)務（限定企業(yè)經(jīng)營或禁止進出口的商品和技術除外）。（依法需經(jīng)批準的項目，經(jīng)相關部門批準后方可開展經(jīng)營活動）的公司。英賽斯作為機器人與自動化設備、機械電子設備的研發(fā)、生產(chǎn)、銷售及技術咨詢；光學檢測設備、光電產(chǎn)品研發(fā)、制造、銷售；實驗室設備、儀器儀表的研發(fā)、制造、銷售及提供相關的技術咨詢和售后服務；自營和代理各類商品及技術的進出口業(yè)務（限定企業(yè)經(jīng)營或禁止進出口的商品和技術除外）。（依法需經(jīng)批準的項目，經(jīng)相關部門批準后方可開展經(jīng)營活動）的企業(yè)之一，為客戶提供良好的蛋白純化色譜系統(tǒng)，凝膠凈化色譜系統(tǒng)，制備液相色譜，柱塞泵。英賽斯始終以本分踏實的精神和必勝的信念，影響并帶動團隊取得成功。英賽斯始終關注自身，在風云變化的時代，對自身的建設毫不懈怠，高度的專注與執(zhí)著使英賽斯在行業(yè)的從容而自信。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2091176.html</p></div></div></div></div></div><div id="3qmzlsp" class="page-right twoColRt"><div id="rlnkmtv" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="wgikmda" class="recomPic likePro"><a 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