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src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171935864644/6371381719358646441189533.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="nmjwyxb" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171935864644/6371381719358646441189533.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="zt8vzbd" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>樣品前處理直銷蛋白純化系統(tǒng)上門安裝,蛋白純化系統(tǒng)</p><p><span>***更新：</span>2020-10-15 23:02:48</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="f2gxeb2" 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="n8g7qxe" class="page-proshow02"><p class="title">詳細說明</p><div id="7gx8dfm" class="box"><p><p style="text-indent:25px">三、蛋白質(zhì)分子量的測定蛋白質(zhì)分子量測定的方法很多，目前常用的方法有以下幾種。 3.1 凝膠過濾法凝膠過濾法測定蛋白質(zhì)分子量的原理如“分離純化方法”中所述。一定型號的凝膠顆粒上具有一定大小的孔隙，只允許較小的分子進入膠粒，而大于孔隙的分子則不能進入膠粒而被排阻在膠粒外面，樣品前處理直銷蛋白純化系統(tǒng)上門安裝。用洗脫液洗脫時，樣品前處理直銷蛋白純化系統(tǒng)上門安裝，被排阻的分子量大的蛋白質(zhì)先被洗脫下來，隨后能夠進入顆粒的蛋白質(zhì)也按分子量大小而先后被洗脫下來，樣品前處理直銷蛋白純化系統(tǒng)上門安裝，分子量越小的越后被洗脫下來。由于不同排阻范圍的葡聚糖凝膠有一特定的蛋白質(zhì)分子量范圍，在此范圍內(nèi)，分子量的對數(shù)和洗脫體積之間成線性關系。因此，用幾種已知分子量的蛋白質(zhì)為標準進行層析分析，以每種蛋白質(zhì)的洗脫體積對它們的分子量的對數(shù)作圖，繪制出標準洗脫曲線。未知蛋白質(zhì)在同樣的條件下進行層析分析，根據(jù)其所用的洗脫體積，從標準洗脫曲線上可求出此未知蛋白質(zhì)對應的分子量來。樣品前處理直銷蛋白純化系統(tǒng)上門安裝</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="樣品前處理直銷蛋白純化系統(tǒng)上門安裝,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171935864644/6371381719358646441189533.jpg"></div><p style="text-indent:25px">蛋白質(zhì)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(zhì)的酸堿性質(zhì)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(zhì)大分子可以自由通過。因此常用于蛋白質(zhì)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(zhì)子可解離下來（圖2-27a），而溶液中帶正電荷的蛋白質(zhì)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(zhì)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(zhì)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(zhì)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(zhì)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(zhì)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(zhì)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。北京專業(yè)蛋白純化系統(tǒng)上門安裝</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="樣品前處理直銷蛋白純化系統(tǒng)上門安裝,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138172282251484/6371381722822514847644105.jpg"></div><p style="text-indent:25px">三、蛋白質(zhì)分子量的測定 3.3 沉降法沉降法又稱超速離心法。蛋白質(zhì)溶液在受到強大的離心力作用時，蛋白質(zhì)分子趨于下沉，沉降速度與蛋白質(zhì)分子的大小、密度和分子形狀有關，也與溶劑的密度和粘度有關。蛋白質(zhì)顆粒在離心場中的沉降速度用每單位時間內(nèi)顆粒下沉的距離來表示。在離心場中，蛋白質(zhì)分子所受到的凈離心力（離心力減去浮力）與溶劑的摩擦力平衡時，每單位離心場強度的沉降速度稱為沉降系數(shù)（Sedimentation Coefficient）。國際上采用Svedberg單位作為沉降系數(shù)的單位，用S表示，以紀念超速離心法的創(chuàng)始人，瑞典***的蛋白質(zhì)化學家T.Svedberg。一個Svedberg單位（或直接稱一個S）為1×10—13s。蛋白質(zhì)的沉降系數(shù)大約在1×10—13～200×10—13s范圍內(nèi)，即1S～200S。</p><p> 蛋白質(zhì)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(zhì)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(zhì)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(zhì)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(zhì)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(zhì)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。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="樣品前處理直銷蛋白純化系統(tǒng)上門安裝,蛋白純化系統(tǒng)" src="http://tyunfile.71360.com/UpLoadFile/szyss/2020/1/637138171877557587/6371381718775575877865772.jpg"></div><p style="text-indent:25px">蛋白質(zhì)分離純化步驟蛋白質(zhì)分離純化的一般原則：大多數(shù)蛋白質(zhì)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(zhì)。許多蛋白質(zhì)在結構、性質(zhì)上有許多相似之處，所以蛋白質(zhì)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(zhì)從復雜的混合物中提取出來。但是對于任何一種蛋白質(zhì)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(zhì)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(zhì)，首先應選擇一種含目的蛋白質(zhì)較豐富的材料。其次，應設法避免蛋白質(zhì)變性，以制備有活性的蛋白質(zhì)。對于大多數(shù)蛋白質(zhì)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(zhì)和其它雜蛋白，從而達到增加純度和提高產(chǎn)量的目的。江蘇智能蛋白純化系統(tǒng)廠家報價</p><p style="text-indent:25px">樣品前處理直銷蛋白純化系統(tǒng)上門安裝</p><p style="text-indent:25px">蛋白質(zhì)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(zhì)一般含有其他蛋白質(zhì)雜質(zhì)，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(zhì)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(zhì)混合樣品加到凝膠柱中時，比凝膠網(wǎng)孔小的蛋白質(zhì)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(zhì)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(zhì)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(zhì)越小，從柱子上洗脫下來所需時間越長。由于不同蛋白質(zhì)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。樣品前處理直銷蛋白純化系統(tǒng)上門安裝</p><p style="text-indent:25px">蘇州英賽斯智能科技有限公司位于吳江經(jīng)濟技術開發(fā)區(qū)聯(lián)楊路南側、龍橋路西側。英賽斯致力于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，一切以用戶需求為中心，深受廣大客戶的歡迎。公司將不斷增強企業(yè)重點競爭力，努力學習行業(yè)知識，遵守行業(yè)規(guī)范，植根于儀器儀表行業(yè)的發(fā)展。英賽斯秉承“客戶為尊、服務為榮、創(chuàng)意為先、技術為實”的經(jīng)營理念，全力打造公司的重點競爭力。</p></p><br /><p>文章來源地址: 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