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JENKEM/Methoxy PEG Succinimidyl Carboxymethyl Ester/*A3004-10\/M-SCM-30K,10g
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JENKEM/Methoxy PEG Succinimidyl Carboxymethyl Ester/*A3004-10\/M-SCM-30K,10g
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JenKem
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M-SCM
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Description

MethoxyPEGSuccinimidylCarboxymethylEsterforaminePEGylation,withsuperiorqualityspecificationof ≥95%Substitution.

JenKemTechnology’sMethoxyPEGSuccinimidylCarboxymethylEster (MethoxyPEGNHSorMethoxyPEGSCM)isahighqualityaminereactivePEGproductwithastablenon-degradablelinkerbetweenthePEGpolymericchainandtheNHSester.MethoxyPEGSuccinimidylCarboxymethylEsterreactswiththeaminegroupoflysine(s)atroomtemperatureinlessthan1hratpH7-8.Shorter hydrolysishalflifeofM-PEG-SCMensuresmaximumselectivitytowardsmoststericallyavailableaminegroups.

JenKemTechnologyoffersMethoxyPEGSCMEster withMW2kDa (M-SCM-2000),MW3kDa(M-SCM-3000),MW5kDa(M-SCM-5000),MW10kDa(M-SCM-10K),MW20kDa(M-SCM-20K),MW30kDa(M-SCM-30K),MW35kDa(M-SCM-35K)andMW40kDa(M-SCM-40K),in1gand10gpackingsizes. DifferentMWofMethoxyPEGSCM Esterproductsmaybeavailablebycustomsynthesis,pleaseemailus attech@jenkemusa.comfordetailsoncustomPEGs.OtherlinearNHSestersareavailable–pleaseselectother stablelinkerNHSPEGs,or cleavablelinkerNHSPEGs.JenKemTechnology providesrepackagingservicesforanadditionalfee,pleasecontactusifyourequireadifferentpackagesizethanourcatalogselection.

BulkPEGsandGMPgradePEGsaremade-to-order.Pleasecontactus forbulkpricing.

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Foundedin2001byexpertsinPEGsynthesisandPEGylation,JenKemTechnologyspecializesexclusivelyinthedevelopmentandmanufacturingofhighqualitypolyethyleneglycol(PEG)productsandderivatives,andrelatedcustomsynthesisandPEGylationservices.JenKemTechnologyisISO9001andISO13485certified,andadherestoICHQ7AguidelinesforGMPmanufacture.TheproductionofJenKem®PEGsisback-integratedtoin-housepolymerizationdirectlyfromethyleneoxide,enablingfaciletraceabilityforregulatedcustomers.JenKemTechnologycaterstothePEGylationneedsofthepharmaceutical,biotechnology,medicaldeviceanddiagnostics,andemergingchemicalspecialtymarkets,fromlaboratoryscalethroughlargecommercialscale.

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产品名称: 鱼类皮质醇(Cortisol)ELISA Kit(elisa试剂盒) 国内优质ELISA厂家 产品简介: 鱼类皮质醇(Cortisol)ELISA Kit(elisa试剂盒) 国内优质ELISA厂家 ELISA试剂盒 国产现货 SIXIN生产的优质ELISA试剂盒直供全国。http://www.aatbio.com.cn/elisa/ 鱼类皮质醇(Cortisol)ELISA Kit(elisa试剂盒) 国内优质ELISA厂 查看更多>
上海联迈生物工程有限公司在发布的27-羟基胆固醇供应信息,浏览与27-羟基胆固醇相关的产品或在搜索更多与27-羟基胆固醇相关的内容。 查看更多>
北京爱德士元亨生物科技有限公司在发布的司坦唑醇ELISA试剂盒供应信息,浏览与司坦唑醇ELISA试剂盒相关的产品或在搜索更多与司坦唑醇ELISA试剂盒相关的内容。 查看更多>
4arm-PEG-NH2,四臂-聚乙二醇-氨基,4arm-PEG-Amine,分子量10000Da是由上海西宝生物科技有限公司代理或销售的西宝/seebio品牌的试剂,产品来源于美国。上海西宝生物科技有限公司是中国最权威的4arm-PEG-NH2,四臂-聚乙二醇-氨基,4arm-PEG-Amine,分子量10000Da试剂销售服务商之一,在上海等地方销售4arm-PEG-NH2,四臂-聚乙二醇-氨基,4arm-PEG-Amine,分子量10000Da试剂已经多年。生物在线为您提供众多企业4arm-PEG- 查看更多>
上海研生实业有限公司所提供的小鼠磷酸肌醇3激酶ELISA试剂盒质量可靠、规格齐全,上海研生实业有限公司不仅具有精湛的技术水平,更有良好的售后服务和优质的解决方案,欢迎您来电咨询此产品具体参数及价格等详细信息! 查看更多>
上海研生实业有限公司所提供的甘油 丙三醇质量可靠、规格齐全,上海研生实业有限公司不仅具有精湛的技术水平,更有良好的售后服务和优质的解决方案,欢迎您来电咨询此产品具体参数及价格等详细信息! 查看更多>
产品名称: 小鼠磷脂酰肌醇抗体 elisa 国内优质ELISA厂家 产品简介: 小鼠磷脂酰肌醇抗体 elisa 国内优质ELISA厂家 ELISA试剂盒 国产现货 SIXIN生产的优质ELISA试剂盒直供全国。http://www.aatbio.com.cn/elisa/ 小鼠磷脂酰肌醇抗体 elisa 国内优质ELISA厂家 进口试剂采购网,上海通善生物科技有限公司(BioLeaf)旗下生命科学研究B2C一站式采购平台。 进口试剂采购 查看更多>
上海研生实业有限公司所提供的正己醇 1-己醇质量可靠、规格齐全,上海研生实业有限公司不仅具有精湛的技术水平,更有良好的售后服务和优质的解决方案,欢迎您来电咨询此产品具体参数及价格等详细信息! 查看更多>
产品名称: 人乙醇脱氢酶(ADH)ELISA Kit(elisa试剂盒) 国内优质ELISA厂家 产品简介: 人乙醇脱氢酶(ADH)ELISA Kit(elisa试剂盒) 国内优质ELISA厂家 ELISA试剂盒 国产现货 SIXIN生产的优质ELISA试剂盒直供全国。http://www.aatbio.com.cn/elisa/ 人乙醇脱氢酶(ADH)ELISA Kit(elisa试剂盒) 国内优质ELISA厂家 进口试剂采购网,上海 查看更多>
上海研生实业有限公司所提供的3-甲基环己醇 间甲基环己醇质量可靠、规格齐全,上海研生实业有限公司不仅具有精湛的技术水平,更有良好的售后服务和优质的解决方案,欢迎您来电咨询此产品具体参数及价格等详细信息! 查看更多>
金克隆(北京)生物技术有限公司在发布的山梨醇含量测试盒 可见分光光度法供应信息,浏览与山梨醇含量测试盒 可见分光光度法相关的产品或在搜索更多与山梨醇含量测试盒 可见分光光度法相关的内容。 查看更多>
产品名称:大鼠雌二醇受体试剂盒产品简介:规格型号:96T/48T,来源:elisa试剂盒(进口分装),供应商:中国试剂网,产品别名:猪组织因子elisa试剂盒动物疫病快速检测试剂盒做的比较好的有国外的艾德士,采用酶联检测抗体包被法,质量好价格高,检测步骤多,出结果时间较长;国内做的比较好的有武汉科前和深圳绿诗源等。 猪链球菌快速检测盒武汉科前做的最早,但是其产品只能检测猪链球菌II型一种,操作方法比较繁琐;深圳绿诗源采用自己研制的抗体和 查看更多>
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小弟有一中药处方,需要水煮醇沉处理,问下具体该怎么做,给我方子的老师去世了

告诉我中药先水煮,在用水煮醇沉法外敷治疗

给电话我直接问液可以

各位老师好,有做环黄芪醇的吗?其对心血管效果怎么样?使用剂量范围是不是很窄,我看文献,有报道,黄芪提取物对血管的作有是双向的,会不会在低剂量时对身体是有害的

醇水双提法:先提取挥发性成分备用,药渣再与余药加水煎煮,并与蒸馏后药液共制成稠膏或干浸膏粉。
完全醇水溶液如长期存放,会出现粘度增加甚至凝胶化的现象,聚合度和粘度越高,储存温度越低,越容易出现这种想象。可以采取以下措施:
(1)将聚乙烯醇水溶液重新加热搅拌即可恢复原来的流动性。
(2)添加硫氰盐酸盐(如钙、钠、铵等盐类)、苯酚、丁醇、山梨酸等可以有效防止凝胶化,添加量为5~10%。部分醇解型PVA长期存放不易产生粘度增加的情况。同时要注意长期存放容易发生发霉、腐化现象,需添加防霉、防腐剂。建议配置好水溶液后即时使用。
硝基能够活化苯环的邻对位,使这些位置上发生亲核取代反应的活性增加。

在本例中,溴处在间位,因此不参与反应。

而氯恰好处于对位,因而能发生反应,被甲氧基取代。

因此产物是4-硝基-2-溴苯甲醚。
工业乙醇 123
2018-01-21
工业是一种混合物 工业醇约含乙醇96%.其中还常常含有少量甲醇.甲醇又称木醇.木酒精.为无色.透明.略有乙醇味的液体.是工业酒精的主要成分之一 还有少量水 和少量杂醇、烷烃类等有机物及硫化物。 乙醇的化学是为化学式:C2H5OH 甲醇的化学是为CH3OH
醛怎么变成醇?123
139206634172018-01-13
醛如何变成醇

各位亲,本人用70%乙醇回流提了中药大概70L,准备旋蒸浓缩但一直没浓缩,室温放了5天,之后要做药理试验的,会不会影响药效?需要重提吗?感谢感谢

醇溶性浸出物测定法中(热浸法)(1)精密称取供试品,并精密加45%的乙醇后静置1小时,静置时不需要指定条件吗?直接在室温下静置吗?
(二)连接回流冷凝管时,冷凝管连接水不会对浸出物造成影响吗?
请求大神指点,不胜感激!

本人目前在做一个中药提取方法的研究,水提醇沉,醇沉浓度分别为50%、60%和70%,检验结果,得率分别为21.99%、23.85%和25.55%,但含量分别是33.48mg/g、16.60mg/g和19.42mg/g。理论上是醇沉浓度越高,去除的杂质越多,得率越低吗?含量是不是也应该是醇沉浓度越高含量越高?我的试验有什么问题,求各位大虾指点!

我想提取中药中的有效成分,好像目前醇提取的比较多,中药有比如黄柏,桑白皮这些。有谁知道醇提取步骤吗?能不能帮帮忙,万分感激

醇分子中,连有羟基(-OH)的碳原子必须有相邻的碳原子且与此相邻的碳原子上,并且还必须连有氢原子时,才可发生消去反应。
补充:
一般使用浓硫酸作催化剂,使醇类脱去羟基生成含双键的有机物。应注意的是醇发生消去反应时的温度控制,温度较低(140℃)时会生成副产物醚类,温度达到一定范围(170℃)时才会发生消去反应。消去反应的本质是羟基与β位上的一个H原子共同脱去生成H2O的反应,因而能发生消去反应的醇类必须要有β-H原子。  
如果羟基相连接的碳的邻位碳有多个,且都有氢原子,则消去有氢原子较少的邻位碳上的氢原子。  示例:  
乙醇发生消去反应的方程式
CH3CH2OH→CH2=CH2+H2O (条件为浓硫酸 170摄氏度)


求助战友们:

有做过中药醇提取,但是在收醇的时候,当浓缩至醇浓度约20%的时候,有析出现象,析出的还是我的有效成分,怎么才能解决这个问题呢?如果在未析出时停止浓缩,药液太稀,无法干燥呢?

问题1:我该如何浓缩定参数?

问题2:如果在未析出时放液,由于药液太稀,我该如何选择干燥方式?

求助站里的大侠们,谢谢!



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