Further Insights into the Electrooxidation of<b><i>N</i></b>-Methyluric Acids and Correlation of Oxidation Potentials with Frontier MO Energies
作者:Rajendra N. Goyal、P. P. Thankachan、Neena Jain
DOI:10.1246/bcsj.73.1515
日期:2000.7
The electrochemical oxidation of various N-methylated uric acids has been studied at a pyrolytic graphite electrode at physiological pH 7.2. The observed behavior was compared with uric acid to evaluate the effect of a methylgroup. The Ep value was found to shift to less positive potentials when a methylgroup is present at the N-1 position and to more positive potentials when substitution is at the
已经在生理 pH 7.2 的热解石墨电极上研究了各种 N-甲基化尿酸的电化学氧化。将观察到的行为与尿酸进行比较以评估甲基的影响。发现当甲基存在于 N-1 位置时,Ep 值转移到较低的正电位,而当取代位于 N-3 位置或咪唑环的氮时,Ep 值会转移到更正的电位。只有当两个甲基存在于不同的环中时,ΔEp 的值才遵循取代基的可加性效应。还发现甲基会增加尿酸的 N 原子处的电子密度,并且观察到氧化电位和最高占据分子轨道能量之间的极好相关性。根据这些研究得出的结论是,嘧啶环中甲基的存在限制了尿囊素的形成。过氧化物酶催化氧化 U 的 N-甲基化衍生物
Highly branched alpha-D-glucans
申请人:Purdue Research Foundation
公开号:US10117937B2
公开(公告)日:2018-11-06
Compositions including a highly branched alpha-D-glucan or modified forms thereof and a solute compound are described herein. The compositions can provide increased water solubility and/or increased rate of dissolution for the solute compound. The compositions can also provide increased stability for the solute compound. Methods for preparing and using compositions including a solute compound and a highly branched alpha-D-glucan are also described.
A material comprising a highly branched carbohydrate polymer, a polyalkylene glycol (or polyalkylene oxide) linked to the highly branched carbohydrate polymer, and a hydrophobic or amphiphilic group linked to the highly branched carbohydrate polymer and/or the polyalkylene glycol (or polyalkylene oxide), is described. Methods of making and using the material, as well as a soluble composition that contains the material and a hydrophobic solute compound, are also described.