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src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278336263828125/6823745.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="5bcltnh" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278336263828125/6823745.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="usdnspb" 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)品關鍵詞：</span>食品級泛解酸內(nèi)酯報價</p><p><span>***更新：</span>2020-06-25 09:24:48</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="rfhsd9p" 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="q7f9q8l" class="page-proshow02"><p class="title">詳細說明</p><div id="ubvywui" class="box"><p><p> D-(-)-泛酰內(nèi)酯 CAS： 599-04-2。 </p> <p> <br /> </p> <p> 化合物中文學名 D-(-)-泛酰內(nèi)酯。 </p> <p> <br /> </p> <p> 中文別名:(3R)-二氫-3-羥基-4,4-二甲基-2(3H)-呋喃酮。 </p> <p> <br /> </p> <p> 中文別名:D-泛解酸內(nèi)酯。 </p> <p> <br /> </p> <p> 中文別名:D-(-)-泛酰內(nèi)酯。 </p> <p> <br /> </p> <p> 中文別名: (R)-3-羥基-4,4-二甲基-二氫-2(3H)-呋喃酮。 </p> <p> <br /> </p> <p> 中文別名:D-(-)-Pantolactone </p> <p> D-(-)-泛酰內(nèi)酯。 </p> <p> <br /> </p> <p> 中文別名:D(-)-泛酰內(nèi)酯，食品級泛解酸內(nèi)酯報價。 </p> <p> <br /> </p> <p> 中文別名:D-泛酰內(nèi)酯。 </p> <p> <br /> </p> <p> 中文別名:α-羥基-β,β-二甲基-γ-丁內(nèi)酯，食品級泛解酸內(nèi)酯報價。 </p> <p> <br /> </p> <p> 中文別名:二氫-3-羥基-4,4-二甲基-2(3H)呋喃酮。 </p> <p> <br /> </p> <p> 化合物英文學名 (D)-Pantolactone 。 </p> <p> <br /> </p> <p> D-泛解酸內(nèi)酯CAS號599-04-2。 </p> <p> <br /> </p> <p> D-泛解酸內(nèi)酯分子式 C6H10O3 。 </p> <p> <br /> </p> <p> D-泛解酸內(nèi)酯含量：99%，食品級泛解酸內(nèi)酯報價。 </p> <p> <br /> </p> <p> 泛解酸內(nèi)酯性狀：白色晶體。 </p> <p> <br /> </p> <p> D-泛解酸內(nèi)酯是一種混旋泛酸鈣的中間體。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品級泛解酸內(nèi)酯報價" src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278336263828125/6823745.png"></div><p style="text-indent:25px">泛解酸內(nèi)酯是合成D-泛酸鈣和D-泛醇的重要中間體,國內(nèi)主要采用生物拆分法,雖取得一定進展,但存在底物濃度偏低、反應條件苛刻、光學純度不高和催化劑活性不強等問題?；瘜W不對稱合成法成為近年來制備手性泛內(nèi)酯的研究熱點。根據(jù)手性源的不同,介紹過渡金屬配合物催化不對稱還原酮基泛內(nèi)酯,過渡金屬配合物催化羥醛縮合反應,有機小分子及其衍生物不對稱催化羥醛縮合反應并經(jīng)還原內(nèi)酯化合成泛內(nèi)酯以及光學活性化合物作為反應底物或非手性底物中加入手性助劑的合成手性泛內(nèi)酯工藝。其中,有機小分子催化乙醛酸酯與醛的反應表現(xiàn)出良好的催化效果,且催化劑易得,反應條件溫和,操作簡單?？s合產(chǎn)物的收率和對映選擇性均不高,設計具有高活性和高選擇性的有機小分子手性催化劑是今后研究的重點。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="食品級泛解酸內(nèi)酯報價" src="https://tyunfile.71360.com/WaterMark/UploadFile/shlinchen/637278336147089843/7803549.png"></div><p> 傳統(tǒng)的生產(chǎn)方法是化學拆分法或鈣鹽誘導結(jié)晶法?；瘜W拆分的缺點是拆分劑太貴，分離困難，步驟多，成本高，還0性和環(huán)境污染問題。鈣鹽誘導結(jié)晶法步驟多，收率低，投資大，擴大生產(chǎn)規(guī)模比較困難。另外，誘導結(jié)晶法不能用于D－泛醇等泛酸衍生物生產(chǎn)。 </p> <p> “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，反復分批酶轉(zhuǎn)化可達180次以上，所得到的酶水解產(chǎn)物光學純度達到99％e．e．以上，因此具有較好的技術經(jīng)濟競爭力。 </p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/385131.html</p></div></div></div></div></div><div id="0qoykww" class="page-right twoColRt"><div id="00iygwe" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="qmwqimq" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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