Proteinase N-catalysed regioselective esterification of sucrose and other mono- and disaccharides
摘要:
Crude Proteinase N was used as catalyst for the synthesis of carbohydrate (in particular sucrose) esters by transesterification of activated esters in organic solvents. Polymerisable or amphiphilic sucrose esters (methacrylates and laurates) were obtained regioselectively in good yields. The influence of the reaction parameters (temperature, pH, solvent, chain length, solid support) on the reaction rate, yield and selectivity was studied. (C) 2001 Elsevier Science Ltd. All rights reserved.
of sucrose fatty acid esters to undergo intramolecular migrations in organic medium and the regioselectivity of some transesterifications of sucrose were investigated by HPLC, in situ NMR spectroscopy and preparative methods. Extensive acylation on secondary positions of the glucose moiety followed by migrations is general for base catalysed transesterification. The stability of 3‐ and 6‐O‐acyl derivatives
between formation, migration and hydrolysis of sucrose mono-esters and -carbonates confirmed that the pre-eminent reactivity of some secondary positions persists in aqueous medium, and in particular, OH-2, even though fast subsequent migrations finally enrich the mixture in compounds substituted at the primary positions. The reaction was also shown to depend strongly on the starting sucrose concentration
X-ray fluorescence (XRF) spectrometry has been used for detecting binding events and measuring binding selectivities between chemicals and receptors. XRF may also be used for estimating the therapeutic index of a chemical. For estimating the binding selectivities of a chemical versus chemical analogs, for measuring post translational modification of proteins, and for drug manufacturing.
X 射线荧光 (XRF) 光谱法已被用于检测化学物质与受体之间的结合事件和测量结合选择性。XRF 还可用于估算化学品的治疗指数。XRF 还可用于估算化学品的治疗指数、估算化学品与化学类似物的结合选择性、测量蛋白质的翻译后修饰以及药物生产。
X-ray microscope
申请人:XRpro Sciences, Inc.
公开号:EP2511844B1
公开(公告)日:2015-08-12
Advanced Drug Development and Manufacturing
申请人:XRpro Sciences, Inc.
公开号:US20150309021A1
公开(公告)日:2015-10-29
X-ray fluorescence (XRF) spectrometry has been used for detecting binding events and measuring binding selectivities between chemicals and receptors. XRF may also be used for estimating the therapeutic index of a chemical. For estimating the binding selectivities of a chemical versus chemical analogs, for measuring post translational modification of proteins, and for drug manufacturing.