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id="vtuqm2n" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shbeicanghuagong/637326788904160156/3342028.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="p2n7flr" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shbeicanghuagong/637326788904160156/3342028.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="3so33jz" 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>連云港乙基VC 醚供應(yīng)商,維生素C乙基醚</p><p><span>***更新：</span>2020-12-01 03:18:15</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="jxouabc" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海北倉(cāng)化工科技有限公司</a></p><p><span>聯(lián)系人：</span>王金良</p><p><span>郵箱: </span>shbeicang@vip.126.com</p><p><span>電話: </span>18516286991</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.shbeicang.cn</p><p><span>手機(jī): </span>021-60459206</p><p><span>地址: </span>金山大道4168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="buvrs8n" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="3sieklr" class="box"><p><p style="text-indent:25px">維生素C乙基醚說(shuō)的是具有美白淡斑組合物及美白淡斑護(hù)膚品，根據(jù)所描述的美白淡斑組合物分由VC乙基醚、熊果苷、白芷提取物、煙酰胺、甘草酸二鉀、野菊維素組成?？梢酝ㄟ^(guò)有效阻礙或阻止皮膚黑色素的生成、轉(zhuǎn)移，可以快速、有效地達(dá)到美白效果；能夠有效地解決美白活性成分易分解、易氧化、易變色等問(wèn)題，降低了光線，連云港乙基VC 醚供應(yīng)商、熱對(duì)功效成分的影響，連云港乙基VC 醚供應(yīng)商，使其活性降低的問(wèn)題；使用維生素C乙基醚所述的美白淡斑組合物及美白淡斑護(hù)膚品沒(méi)有其他作用，安全性好，連云港乙基VC 醚供應(yīng)商，能達(dá)到長(zhǎng)久美白淡斑作用。維生素C乙基醚適用于美白淡斑產(chǎn)品，祛皺和**老產(chǎn)品。連云港乙基VC 醚供應(yīng)商</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港乙基VC 醚供應(yīng)商,維生素C乙基醚" src="https://tyunfile.71360.com/UploadFile/shbeicanghuagong/637326788904160156/3342028.png"></div><p style="text-indent:25px">目前應(yīng)用較多的維生素衍生物是:維生素C葡糖苷、維生素C磷酸酯鎂、維生素C乙基醚、維生素C磷酸酯鈉。維生素C乙基醚中維生素C的含量比較高，而分子量比較小，且既水溶又油溶, .更有利于進(jìn)入皮膚，吸收好。相同維生素C衍生物含量，其中當(dāng)含量< 0.01%時(shí)，黑色素的含量%，比較:維生素C磷酸鈉>維生素C磷酸酯鎂>維生素C糖苷>維生素C乙基醚:當(dāng)含量>0.01%時(shí)，黑色素的含量%，比較:維生素C磷酸鈉>維生素C糖苷>維生素C磷酸酯鎂>維生素C乙基醚。可見(jiàn)，相同維生素C衍生物的含量中，維生素C乙基醚中黑色素含量比較低，說(shuō)明維生素C乙基醚能夠有效阻礙酪氨酸酶活性，能夠更好的阻礙黑色素，具有更好的美白功效。連云港乙基VC 醚供應(yīng)商維生素C乙基醚使用沒(méi)有其他作用，安全性好，能達(dá)到長(zhǎng)久美白淡斑作用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港乙基VC 醚供應(yīng)商,維生素C乙基醚" src="https://tyunfile.71360.com/UploadFile/shbeicanghuagong/637326788868466796/2146974.png"></div><p style="text-indent:25px">由于維生素C乙基醚一大功能是抗氧化，通常的建議是放在早上使用。白天紫外線照射是產(chǎn)生自由基的元兇，自由基會(huì)破壞體內(nèi)的蛋白質(zhì)類成分及DNA，當(dāng)破壞速度大于表皮修復(fù)能力時(shí)，?光老化就產(chǎn)生了，而抗氧化劑其實(shí)就是還原劑，可以對(duì)UV照射下形成的活性氧自由基進(jìn)行還原，減少這些自由基對(duì)皮膚的破壞。當(dāng)然早晚都使用也是可以的。另外，維生素C乙基醚不會(huì)造成光敏反應(yīng)，白天用和晚上開(kāi)著燈用都不會(huì)變黑，如果誰(shuí)這么告訴你，你問(wèn)問(wèn)他知不知道什么是‘光敏性‘。</p><p style="text-indent:25px">維生素C乙基醚制備：5,6-O-異亞丙基-抗壞血酸的合成：向1.5升的單口燒瓶中加入70g抗壞血酸，22克對(duì)甲苯磺酸，700毫升**，室溫(25℃)下反應(yīng)8小時(shí)，反應(yīng)液中有大量結(jié)晶生成。過(guò)濾，濾餅用**洗滌，真空干燥后，得到5,6-O-異亞丙基-L-抗壞血酸晶體80克，收率為93％。補(bǔ)足**和抗壞血酸后，重復(fù)該步反應(yīng)可循環(huán)制得5,6-O-異亞丙基-L-抗壞血酸。3-O-烷基-5,6-O-異亞丙基抗壞血酸的合成：DMSO為溶劑，溴乙烷與抗壞血酸摩爾比為0.5/1：稱取30克5,6-O-異亞丙基-L-抗壞血酸，溶于120毫升DMSO中，加入7.6克溴乙烷，11.6克碳酸氫鈉，然后在70℃下反應(yīng)2小時(shí)。冷卻至室溫(25℃)后，用1000毫升甲苯分三次萃取，萃取液經(jīng)水洗后濃縮結(jié)晶得到3-O-乙基-5,6-O-異亞丙基抗壞血酸16.2克，以溴乙烷計(jì)收率為95％。實(shí)例103-O-乙基-5,6-O-異亞丙基抗壞血酸脫保護(hù)：3）3-O-乙基抗壞血酸的合成：3-O-乙基-5,6-O-異亞丙基抗壞血酸10克溶于100毫升甲醇，再加入5毫升(體積分?jǐn)?shù)為50％)鹽酸，加熱至60℃反應(yīng)3小時(shí)。用碳酸氫鈉中和后加入乙酸乙酯萃取結(jié)晶得到3-O-乙基抗壞血酸8.2克，收率為98％。維生素C乙基醚在化學(xué)物質(zhì)上非常穩(wěn)定，是不變色的維生物C衍生物。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="連云港乙基VC 醚供應(yīng)商,維生素C乙基醚" src="https://tyunfile.71360.com/UploadFile/shbeicanghuagong/637326788671826171/6679575.png"></div><p style="text-indent:25px">維生素C乙基醚是一種非常有用的維生素C衍生物，它不僅在化學(xué)物質(zhì)上非常穩(wěn)定，是不變色的維生物C衍生物，而且是親油親水兩性物質(zhì)，這有效的擴(kuò)展了他的適用范圍，尤其是在日用化學(xué)中應(yīng)用。3-O-乙基抗壞血酸醚很容易通過(guò)角質(zhì)層進(jìn)去真皮層，它進(jìn)入機(jī)體后非常容易體內(nèi)的生物酶分解從而發(fā)揮維生素C的生物學(xué)功效。主要功效：VC乙基醚進(jìn)入真皮層后直接參與膠原蛋白的合成修復(fù)皮膚細(xì)胞活性，使膠原蛋白增加，從而使皮膚變得充盈富有彈性，使肌膚細(xì)膩光滑。阻抑酪氨酸酶活性，阻抑***，還原黑色素為無(wú)色，高效美白肌膚?？箟难崴漠愖貦八狨セ蚍Q四己基癸醇抗壞血酸酯，其中維生素C乙基醚比較常見(jiàn)。連云港乙基VC 醚供應(yīng)商</p><p style="text-indent:25px">維生素C乙基醚無(wú)嗅或有由乙醛和維生素C組成的獨(dú)特氣味。連云港乙基VC 醚供應(yīng)商</p><p style="text-indent:25px">Vc乙基醚的制備:水解:將200-300L的甲醇、不多于4kg的濃鹽酸、不多于35kg的碳酸氫鈉以及折干成160-240kg的Vc- B濕品放入水解槽中進(jìn)行水解 ; 過(guò)濾:將水解后的物料在加入15-25L 甲醇的條件下經(jīng)過(guò)過(guò)濾器過(guò)濾; 濃縮、溶解:經(jīng)過(guò)過(guò)濾器后的物料送入濃縮罐,在加入200-300L 甲醇的條件下濃縮并溶解,分離出甲醇水,去往回收甲醇,其余物料在加入80- -120L 的甲苯和150-210L的正丁醇后蒸餾并溶解,導(dǎo)出甲苯去回收 ;過(guò)濾:將蒸餾并溶解后的物料在加入15- -25L正J醇的條件下,經(jīng)過(guò)過(guò)濾器過(guò)濾;結(jié)晶、離心和干燥:經(jīng)過(guò)過(guò)濾器后的物料先送入結(jié)晶罐進(jìn)行結(jié)晶,然后在混合有100-200L 的乙酸丙乙酯后送入離心機(jī)離心得到正J醇母液套用溶解Z酯母液回收以及Vc乙基醚濕品后,之后將Vc乙基醚濕品送入干燥器進(jìn)行干燥,在去除乙酯后得到Vc乙基醚干品。連云港乙基VC 醚供應(yīng)商</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/2214845.html</p></div></div></div></div></div><div id="sgntzpq" class="page-right twoColRt"><div id="ktp7x8c" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xghdea7" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="8cd3x92" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img src="https://tyunfile.71360.com/WaterMark/UploadFile/nbzxsw/637298235378037109/764794.png" alt="寧波寧海直接考A2有幾個(gè)科目真誠(chéng)推薦寧波助學(xué)商務(wù)信息咨詢供應(yīng)" 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