Flow-Synthesis of Nucleosides Catalyzed by an Immobilized Purine Nucleoside Phosphorylase from<i>Aeromonas hydrophila</i>: Integrated Systems of Reaction Control and Product Purification
A purinenucleosidephosphorylase from Aeromonas hydrophyla (AhPNP) was covalently immobilized in a pre‐packed stainless steel column containing aminopropylsilica particles via Schiff base chemistry upon glutaraldehyde activation. The resulting AhPNP‐IMER (Immobilized Enzyme Reactor, immobilization yield ≈50%) was coupled on‐line through a 6‐way switching valve to an HPLC apparatus containing an analytical
戊二醛活化后,通过席夫碱化学将水合气单胞菌(Ah PNP)的嘌呤核苷磷酸化酶共价固定在预先包装的含有氨基丙基二氧化硅颗粒的不锈钢柱中。所得的Ah PNP-IMER(固定化酶反应器,固定化率≈50%)通过六通切换阀在线连接至包含分析或半制备色谱柱的HPLC设备。通过将反应混合物连续泵送通过Ah进行5种6-修饰的嘌呤核糖核苷的合成PNP-IMER,直到达到最高转化率,然后将反应混合物进行色谱分离。通过分数阶乘实验设计优化了Ah PNP催化转糖基化的条件(糖供体:碱基受体的比例为2:1 ; 10 mM磷酸盐缓冲液; pH 7.5;温度37°C,流速0.5 mL min -1)。在这种集成平台上将生物转化步骤与产品纯化相结合,可实现快速有效的合成过程(收率= 52–89%; <10 mg),从而最大限度地减少了样品处理。迄今为止,Ah PNP-IMER在10个月内进行了50次反应后完全保留了其活性。
Improved Synthesis of Phosphoramidite-Protected N6-Methyladenosine via BOP-Mediated SNAr Reaction
作者:Shifali Shishodia、Christopher J. Schofield
DOI:10.3390/molecules26010147
日期:——
N6-methyladenosine(m6A) is the most abundant modification in mRNA. Studies on proteins that introduce and bind m6A require the efficientsynthesis of oligonucleotides containing m6A. We report an improved five-step synthesis of the m6A phosphoramidite starting frominosine, utilising a 1-H-benzotriazol-1-yloxytris(dimethylamino)phosphoniumhexafluorophosphate (BOP)-mediated SNAr reaction in the key
Adenosine receptor activation reagent and the uses of thereof
申请人:Zhejiang Subtropical Crops Research Institute
公开号:US10479814B2
公开(公告)日:2019-11-19
The present invention relates to application of N(6)-(2-hydroxyethyl)-adenosine (HEA) and its derivatives as an adenosine A1 receptor agonist in preparation of drug or food, the HEA and its derivatives are used in treatment of diseases relating to adenosine receptor regulator, such as insomnia, pain, convulsion, apoplexia, Parkinson's disease, opioid drug addiction and kidney ischemia reperfusion injury etc. The present invention provides a new method for treatment of the diseases relating to nervous system and kidney.
Encapsulated transfer factor compositions and methods of use
申请人:Ramaekers C. Joseph
公开号:US20060073197A1
公开(公告)日:2006-04-06
Compositions comprising transfer factor and/or glucan, such as hybrid glucan, coated with a hydrophobic or lipid coating. The composition can be combined with nutraceuticals including zinc, essential fatty acids, lactic acid generating bacteria, etc. Also provided are methods for prevention and treatment of animal pathologies using these compositions as well as methods for making them.
[EN] BEVERAGE MADE FROM ISARIA CICADAE MIQUEL AND RHIZOMA POLYGONATI, AND METHOD FOR PREPARING SAME<br/>[FR] BOISSON CONSTITUÉE D'ISARIA CICADAE MIQUEL ET DE RHIZOMA POLYGONATI, ET SON PROCÉDÉ DE PRÉPARATION<br/>[ZH] 一种蝉花黄精饮料及其制备方法