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id="yh7s9mo" class="twoCol"><div id="hb9f4zg" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/second-_yyby/">醫(yī)藥健康</a>?<a href="http://www.cdcfah.com/cp/third-yyby_zyfl/">制藥輔料</a>?599-04-2泛解酸內(nèi)酯中間體上海臨辰供應(yīng)</p><div id="lfkg7rt" class="leftbox clearfix"><h1>599-04-2泛解酸內(nèi)酯中間體上海臨辰供應(yīng)</h1><div id="swkrghe" class="proBig"><div id="pj3tn8c" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289625869141/3735503.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="swq2vxp" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289625869141/3735503.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ynp78mt" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>599-04-2泛解酸內(nèi)酯中間體,泛解酸內(nèi)酯</p><p><span>***更新：</span>2020-07-09 03:27:04</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="ihovxev" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海臨辰醫(yī)藥科技有限公司</a></p><p><span>聯(lián)系人：</span>葉海岑</p><p><span>郵箱: </span>info@linchenpharm.com</p><p><span>電話: </span>13761181955</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span></p><p><span>手機(jī): </span>021-31606595</p><p><span>地址: </span>辰花路5088弄221號(hào)</p><p>[當(dāng)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="83jyf7g" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="fe7aj7e" class="box"><p><p> 化還原酶催化不對(duì)稱還原制備D-泛解酸內(nèi)酯氧化還原酶不對(duì)稱還原酮泛解酸內(nèi)酯的方法。用L-泛解酸內(nèi)酯脫氫酶將L-泛解酸內(nèi)酯氧化成酮泛解酸內(nèi)酯，再利用酮泛解酸內(nèi)酯還原酶將其不對(duì)稱還原成D-泛解酸內(nèi)酯。該方法也可將外消旋的泛解酸內(nèi)酯作為起始原料，經(jīng)過氧化還原反應(yīng)后得到D-泛解酸內(nèi)酯，過程簡單，599-04-2泛解酸內(nèi)酯中間體，599-04-2泛解酸內(nèi)酯中間體，不需要化學(xué)法中的再消旋化反應(yīng)。 </p> <p> <p> 制備方法包括以下步驟：(1)將纈氨酸在過氧化氫酶和α?酮異戊酸還原酶的作用下，進(jìn)行酶轉(zhuǎn)化得到α?酮異戊酸； </p> <p> <br /> </p> <p> (2)將所述α?酮異戊酸與四氫葉酸在羥甲基轉(zhuǎn)移酶和氯化鎂的作用下，599-04-2泛解酸內(nèi)酯中間體，反應(yīng)制備酮泛解酸； </p> <p> <br /> </p> <p> (3)將所述酮泛解酸在α?酮異戊酸還原酶的作用下，進(jìn)行酶轉(zhuǎn)化得到泛解酸； </p> <p> <br /> </p> <p> (4)將所述泛解酸制備得到泛解酸內(nèi)酯。 </p> D-泛解酸內(nèi)酯是合成D-泛酸的重要中間體。599-04-2泛解酸內(nèi)酯中間體</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="599-04-2泛解酸內(nèi)酯中間體,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289625869141/3735503.png"></div><p> (S)-(+)-泛解酸內(nèi)酯（L-Pantolactone），分子式為C6H10O3。 </p> <p> 中文名稱 </p> <p> (S)-(+)-泛解酸內(nèi)酯英文名稱 </p> <p> L-Pantolactone中文別名 </p> <p> L-(+)-泛解酸內(nèi)酯;S-泛解酸內(nèi)酯;英文別名 </p> <p> (3S)-3-hydroxy-4,4-dimethyloxolan-2-one;(S)-3-Hydroxy-4,4-dimethyldihydrofuran-2(3H)-one;L-(+)-Pantolactone;CAS號(hào) </p> <p> 5405-40-3 分子式 </p> <p> C6H10O3分子量 </p> <p> 130.14200精確質(zhì)量 </p> <p> 130.06300PSA </p> <p> 46.53000LogP </p> <p> -0.06970 </p> <p> <p> 物化性質(zhì)折射率：1.469 </p> <p> 閃點(diǎn)：99oC </p> <p> 熔點(diǎn)：90-94oC </p> <p> 密度：1.165g/cm3 </p> <p> 沸點(diǎn)：120-122oC/15mmHg(lit.)。 </p> l-泛解酸內(nèi)酯批發(fā)D-泛酸鈣具有補(bǔ)充人體內(nèi)維生素B需求和增強(qiáng)食品風(fēng)味兩方面功效。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="599-04-2泛解酸內(nèi)酯中間體,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278339844755859/788254.png"></div><p style="text-indent:25px">維生素B5（VitaminB5）又稱D-維生素B5，是人體必需的13種維生素之一，是一種水溶性維生素，維生素B族成員之一，是它是輔酶a（CoA）及?；d體蛋白（acylcarrierprotein,acp）的組成部分。機(jī)體內(nèi)的泛酸，幾乎都用以組成輔酶a及acp的輔基。VB5前段生產(chǎn)工藝有多種，生產(chǎn)后段拆分方法有化學(xué)和微生物酶拆法兩種。VB5（D-維生素B5）首先要制備2個(gè)重要的中間體，分別為β-氨基丙酸和DL-泛解酸內(nèi)酯。β-氨基丙酸的合成有丙烯腈路線、丙烯酸路線、琥珀酰亞胺路線等，現(xiàn)國內(nèi)生產(chǎn)廠大多采用丙烯腈路線。</p><p style="text-indent:25px">D-泛解酸內(nèi)酯?，F(xiàn)有技術(shù)中還有在培養(yǎng)基中培養(yǎng)尖孢鐮孢菌，在培養(yǎng)后的尖孢鐮孢菌與底物混合，水解得到D-泛解酸，內(nèi)酯化獲得D-泛解酸內(nèi)酯，但是本方法采用發(fā)酵制備D-泛解酸內(nèi)酯的過程能耗較高，且產(chǎn)率低，工業(yè)成本較高?，F(xiàn)有技術(shù)中還有以水和甲苯為溶劑體系，通過添加D-泛解酸內(nèi)酯作為晶種，誘導(dǎo)結(jié)晶獲得D-泛解酸內(nèi)酯的方法，但是本方法在生產(chǎn)過程中采用了甲苯，生產(chǎn)過程VOC排放較高，且通過誘導(dǎo)結(jié)晶獲得的一次收率較低，產(chǎn)品比旋度較低。中文別名: (R)-3-羥基-4,4-二甲基-二氫-2(3H)-呋喃酮。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="599-04-2泛解酸內(nèi)酯中間體,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289561562500/2636284.png"></div><p style="text-indent:25px">羥基腈裂合酶催化不對(duì)稱合成D-泛解酸內(nèi)酯前體(R)-氰醇(R)-氰醇是D-泛解酸內(nèi)酯的前體物質(zhì)，可經(jīng)過水解生產(chǎn)D-泛解酸內(nèi)酯。利用(R)-羥基腈裂合酶催化HCN 與羥基特戊醛的羰基碳不對(duì)稱加成進(jìn)而合成(R)-氰醇。大多數(shù)參與醇腈化反應(yīng)的酶主要存在于高等植物中，例如巴旦杏、蘋果、薔薇、橡膠樹、亞麻類等，在植物體內(nèi)羥基腈裂解酶催化形成氫腈酸從而抵御外來物種的入侵。2007 年荷蘭DSM 公司從巴旦杏中提取分離的(R)-羥基腈裂合酶能選擇性合成(R)-氰醇，并構(gòu)建了粟酒裂殖酵母工程菌。2014 年，DSM 公司將來自薔薇科的(R)-羥基腈裂合酶基因構(gòu)建于pJET 重組質(zhì)粒，并導(dǎo)入巴斯德酵母中表達(dá)，確定了該重組酶**適條件范圍為15~20 ℃以及pH 2.5~3.0。在15 ℃和pH 2.5 下醇腈化反應(yīng)2 d，反應(yīng)收率達(dá)到93%，轉(zhuǎn)化率達(dá)**，產(chǎn)物光學(xué)純度達(dá)92%。實(shí)質(zhì)上在拆分工藝的三種傳統(tǒng)方法中（化學(xué)拆分、生物拆分、誘導(dǎo)拆分）。99.9泛解酸內(nèi)酯企業(yè)</p><p style="text-indent:25px">將所述α?酮異戊酸與四氫葉酸在羥甲基轉(zhuǎn)移酶和氯化鎂的作用下，反應(yīng)制備酮泛解酸。599-04-2泛解酸內(nèi)酯中間體</p><p style="text-indent:25px">早在1973 年，KING H L 等就研究發(fā)現(xiàn)一種來源于釀酒酵母的NADP（H）依賴型的酮泛解酸還原酶能夠?qū)⑼航馑徇€原為D-泛解酸內(nèi)酯，該酶在pH 7.0 條件下需要2.2 min 反應(yīng)延滯期才會(huì)催化酮泛解酸內(nèi)酯形成D-泛解酸內(nèi)酯。1984 年，日本學(xué)者SHIMIZU S 等篩選了一系列能夠還原酮泛解酸內(nèi)酯形成泛解酸內(nèi)酯的微生物菌種，其中小紅酵母、不對(duì)稱擲孢酵母、**滑假絲酵母、粟酒裂殖酵母、清酒酵母、黑曲霉和萱草絲衣霉菌能夠催化酮泛解酸內(nèi)酯形成D-泛解酸內(nèi)酯。1987 年SHIMIZU S等利用氧化還原系統(tǒng)從消旋化的泛解酸內(nèi)酯出發(fā)，經(jīng)諾卡式菌選擇性氧化L-泛解酸內(nèi)酯生成酮泛解酸內(nèi)酯，后者經(jīng)**滑假絲酵母不對(duì)稱還原成D-泛解酸內(nèi)酯。599-04-2泛解酸內(nèi)酯中間體</p><p style="text-indent:25px">上海臨辰醫(yī)藥科技有限公司創(chuàng)立于2016-04-05，是一家貿(mào)易型公司。公司業(yè)務(wù)涵蓋[ "泛解酸內(nèi)酯", "有機(jī)可可粉有機(jī)果粉", "阿拉伯膠瓜爾膠 ", "BIS TRIS " ]等，價(jià)格合理，品質(zhì)有保證。公司秉持誠信為本的經(jīng)營理念，在醫(yī)藥、保養(yǎng)深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為**，發(fā)揮人才優(yōu)勢，打造醫(yī)藥、保養(yǎng)質(zhì)量品牌。在社會(huì)各界的鼎力支持下，經(jīng)過公司所有人員的努力，公司自2016-04-05成立以來，年?duì)I業(yè)額達(dá)到300-500萬元。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/542341.html</p></div></div></div></div></div><div id="mgipbvb" class="page-right twoColRt"><div id="gqnp8ac" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xr3bvr3" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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