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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>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>低水分泛解酸內(nèi)酯等級,泛解酸內(nèi)酯</p><p><span>***更新：</span>2020-06-30 00:33:54</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="hgd7ipw" 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: </span>021-31606595</p><p><span>地址: </span>辰花路5088弄221號</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="tnkroas" class="page-proshow02"><p class="title">詳細說明</p><div id="i7dkczw" class="box"><p><p style="text-indent:25px">一種高純度的D?泛酸內(nèi)酯的合成方法包括步驟:將DL?泛酸內(nèi)酯加入到水中,在pH為6.0?8.0用酶水解,得到D?泛解酸以及L?泛酸內(nèi)酯;將上述水溶液經(jīng)有機溶劑萃取,得到D?泛解酸的水溶液以及L?泛酸內(nèi)酯有機溶液;將D?泛解酸的水溶液,控溫20?80℃反應(yīng),用酸調(diào)節(jié)pH至1?4,然后關(guān)環(huán)得到D?泛酸內(nèi)酯水溶液;將步驟S3所得的D?泛酸內(nèi)酯水溶液經(jīng)有機溶劑萃取,然后經(jīng)濃縮，低水分泛解酸內(nèi)酯等級,蒸餾,結(jié)晶得到D?泛酸內(nèi)酯;將步驟S2所得的L?泛酸內(nèi)酯溶液經(jīng)濃縮、然后在堿性條件下消旋得到DL?泛酸內(nèi)酯。本發(fā)明為泛酸鈣制備得到D?泛酸內(nèi)酯，低水分泛解酸內(nèi)酯等級,工藝路線操作簡單,反應(yīng)條件溫和,安全，低水分泛解酸內(nèi)酯等級,環(huán)保,原料價廉易得,工業(yè)適應(yīng)性強。D-泛解酸內(nèi)酯含量：99%。低水分泛解酸內(nèi)酯等級</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低水分泛解酸內(nèi)酯等級,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289561562500/2636284.png"></div><p style="text-indent:25px">KATAOKA M 等于1992 年分離純化出星狀諾卡氏菌生產(chǎn)的L-泛解酸內(nèi)酯脫氫酶，但比酶活只有0.041 7 U/mg。該菌的基因組信息已被披露，然而至今未有構(gòu)建其L-泛解酸內(nèi)酯脫氫酶基因工程菌的報道。2009 年，王永澤等利用面包酵母生產(chǎn)酮泛解酸內(nèi)酯還原酶，并利用β-環(huán)糊精結(jié)合底物，減少底物對菌體的0作用，終產(chǎn)物得率達45%，光學(xué)純度達到90%以上。SI D等于2012 年在嗜麥芽寡養(yǎng)單孢菌845 中克隆一個大小約為30 kDa 的酮泛解酸還原酶，并與葡萄糖脫氫酶共表達成大腸工程菌，構(gòu)建輔酶循環(huán)體系。該大腸工程菌的酮泛解酸還原酶的比酶活達到27.7 U/mg。酶法泛解酸內(nèi)酯承諾守信D-泛解酸內(nèi)酯的市場供應(yīng)商現(xiàn)狀。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低水分泛解酸內(nèi)酯等級,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile//637280289746210938/9268872.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 </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：99oC </p> <p> 熔點：90-94oC </p> <p> 密度：1.165g/cm3 </p> <p> 沸點：120-122oC/15mmHg(lit.)。 </p> </p><p> 化學(xué)酶法合成D-泛解酸內(nèi)酯 </p> <p> 泛酸具有一個手性中心，其中D-泛酸是工業(yè)生產(chǎn)所需要的?；瘜W(xué)法合成D-泛酸（或泛酸鈣）工藝成熟，但步驟繁瑣且對消旋化產(chǎn)物進行結(jié)晶拆分費用昂貴。利用生物酶法生產(chǎn)光學(xué)純的D-泛酸可進一步升級合成工藝，提升產(chǎn)品的競爭力。生物酶法主要包括利用生物菌體發(fā)酵生產(chǎn)和酶法催化。生物菌體發(fā)酵法利用基因工程技術(shù)在大腸桿菌、谷氨酸棒狀桿菌、枯草芽孢桿菌和釀酒酵母等宿主菌中表達泛酸生物合成基因和氨基酸生物合成基因，并利用基因工程菌進行微生物發(fā)酵，泛酸產(chǎn)量較高，但微生物發(fā)酵法發(fā)酵液成分復(fù)雜，后續(xù)的產(chǎn)物分離提取較困難。酶法催化可以替代化學(xué)反應(yīng)過程中的某些步驟，以化學(xué)酶法的方式來實現(xiàn)D-泛酸的前體物質(zhì)D-泛酸內(nèi)酯的生產(chǎn)。目前國內(nèi)外酶法催化生產(chǎn)D-泛解酸內(nèi)酯的方法主要包括酶法選擇性拆分和酶法不對稱合成。關(guān)于酶法不對稱合成，筆者主要綜述了三種路線：1）前手性物質(zhì)酮泛解酸或酮泛解酸內(nèi)酯不對稱還原成D-泛解酸內(nèi)酯；2）利用(R)-羥基腈裂合酶來合成泛解酸內(nèi)酯前體羥基特戊醛；3）醇脫氫酶參與的化學(xué)酶法合成D-泛解酸內(nèi)酯。 </p> <p> <br /> 化合物中文學(xué)名 D-(-)-泛酰內(nèi)酯。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="低水分泛解酸內(nèi)酯等級,泛解酸內(nèi)酯" src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278336263828125/6823745.png"></div><p> D-泛解酸內(nèi)酯的傳統(tǒng)工業(yè)方法是化學(xué)拆分法和生物拆分法。 </p> <p> <br /> </p> <p> 這兩種方法生產(chǎn)過程復(fù)雜，拆分試劑制備回收繁瑣，生產(chǎn)成本高。 </p> <p> <br /> </p> <p> 探求其新的拆分方法，完善生產(chǎn)工藝，提高產(chǎn)品質(zhì)量，一直成為研究者和生產(chǎn)者追求的目的。 </p> <p> <br /> </p> <p> 實質(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）。 </p> <p> <br /> </p> <p> 生產(chǎn)D-泛酸鈣進行了幾十年的摸索，先后采用了誘導(dǎo)拆分DL-泛酸鈣法、化學(xué)拆分D-泛解酸內(nèi)酯法和生物拆分法。 </p> <p> <br /> </p> <p> 生產(chǎn)D-泛酸鈣，近年來拆分方法基本上統(tǒng)一到了生物拆分制備法。中文別名:D-(-)-泛酰內(nèi)酯。D+泛解酸內(nèi)酯產(chǎn)品的辨別方法</p><p style="text-indent:25px">鈣在食品中用作營養(yǎng)增補劑，通常其鈣鹽與其他 B 族維生素一起用于補充營養(yǎng)。低水分泛解酸內(nèi)酯等級</p><p style="text-indent:25px">“微生物酶法拆分制備D－泛解酸內(nèi)酯及用于生產(chǎn)D-泛酸鈣與D-泛醇”項目選育了一株能高產(chǎn)立體專一性D-泛解酸內(nèi)酯水解酶、不利用不降解泛解酸內(nèi)酯或泛解酸的微生物菌株串珠鐮孢霉，建立了國際**的霉菌交聯(lián)原位固定化方法，酶轉(zhuǎn)化時間短到3～5小時，效率高，反復(fù)分批酶轉(zhuǎn)化可達180次以上，所得到的酶水解產(chǎn)物光學(xué)純度達到99％e．e．以上，因此具有較好的技術(shù)經(jīng)濟競爭力。該項目采用的D-泛酸鈣生產(chǎn)能力微生物酶催化拆分方法，與傳統(tǒng)化學(xué)拆分方法相比，以生產(chǎn)D-泛醇為例，原材料消耗減少69．2％，廢液、廢渣排放分別減少65．5％、43．8％，能耗減少12．7％，生產(chǎn)成本降低了26．5％，同時，生物法改善了操作環(huán)境，提高了產(chǎn)品品質(zhì)與產(chǎn)品安全性，提高了D-泛酸生產(chǎn)的整體技術(shù)水平，達到了用高新生物技術(shù)改造傳統(tǒng)化學(xué)工業(yè)的目的。低水分泛解酸內(nèi)酯等級</p><p style="text-indent:25px">上海臨辰醫(yī)藥科技有限公司致力于醫(yī)藥、保養(yǎng)，以科技創(chuàng)新實現(xiàn)***管理的追求。公司自2016-04-05成立以來，投身于[ "泛解酸內(nèi)酯", "有機可可粉有機果粉", "阿拉伯膠瓜爾膠 ", "BIS TRIS " ]，是醫(yī)藥、保養(yǎng)的主力軍。公司終堅持自主研發(fā)創(chuàng)新發(fā)展理念，不斷優(yōu)化的技術(shù)、產(chǎn)品為客戶帶來效益，目前年營業(yè)額達到300-500萬元。上海臨辰醫(yī)藥始終關(guān)注醫(yī)藥、保養(yǎng)市場，以敏銳的市場洞察力以準確定位，實現(xiàn)與客戶的成長共贏。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/441219.html</p></div></div></div></div></div><div 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