DOPE-PEG-Mal的合成与纯化方法
论文:同一时间阻隔 CD47 和 PD-L1 可改善先天畸形性和习惯性肺癌抗体响应甚至上皮细胞细胞发出链接转换://www.thelancet.com/article/S2352-3964(19)30158-6/fulltext作家:舒 莲,谢锐 志,叶玉英,谢晓东,李淑慧,路玉生,李碧飞,程云龙,弗拉基米尔·卡塔纳耶夫,李嘉节选:MAL-PEG-DOPE的人工MAL-PEG-DOPE的分解成对比此前发布的本文。用EDC/NHS新技术将MAL-PEG-COOH的羧基与DOPE的胺基运用。具体实施步骤方式:将30mg羧基呈现的PEG易溶二氯二氧化氮气体中,并与5mgEDC和4mgNHS混合,环境温度下不间断混合2h。并且加进8mg DOPE(MAL-PEG-COOH∶DOPE=1∶1,摩尔比),N2保护区下反馈隔夜。将反馈结果在翻转化掉仪中干热至大有些二氯二氧化氮气体,并且加进冷乙腈中。未反馈的DOPE在2414g下离心力10min,不易溶冷乙腈。上清液在翻转化掉仪中干热为稀脂质。将膜用DD水多化。将反馈结果放到透析袋(原子量= 8 k Da)中,并转变至50 mL DD水盐溶液中,环境温度下反馈24小时候,分离出来氧化钙含量的EDC/NHS/MAL-PEG-COOH。决定性结果DOPE-PEG-MAL接下来用冻干机冷冻熟食。以便手机验证DOPE-PEG-MAL的运用,对样本做出了核磁震荡波谱阐述。Synthesis of MAL-PEG-DOPESynthesis of MAL-PEG-DOPE refers to previously published articles [22,23]. The conjugation of carboxyl groups of MAL-PEG-COOH to the amine groups of DOPE was accomplished using the EDC/NHS technique. The process was carried out as follows: 30 mg carboxyl-modified PEG was dissolved in dichloromethane and mixed with EDC (5 mg) and NHS (4 mg). The solution was stirred continuously for 2 h at room temperature. Subsequently, 8 mg DOPE (MAL-PEG-COOH: DOPE =1:1, molar ratio) was added, and the reaction proceeded overnight under nitrogen. The reaction product was dried out most dichloromethane in rotary evaporator and then added to cold acetonitrile. The unreacted DOPE was centrifuged at 2414g for 10 min which was insoluble in cold acetonitrile. And the supernatant was dried to thin lipid in rotary evaporator. The film was hydrated with DD water. The reaction product was enclosed in dialysis bag (MW = 8 k Da) and transferred into 50 mL of DD water solution to separate free EDC/ NHS/ MAL-PEG-COOH at room temperature for 48 h. The final product DOPE-PEG-MAL was subsequently freezed by lyophilizer. To confirm the DOPE-PEG-MAL conjugation, the samples were examined by nuclear magnetic resonance spectroscopy.



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