The invention provides a polyvinyl acetal having a degree of acetalization of from 45 to 80 mol%, which is obtained through acetalization of a polyvinyl alcohol having a degree of polymerization of from 30 to 1000 and a degree of hydrolysis of from 80.0 to 99.99 mol% and having a specific amount of an ionic group bonded to the terminal thereof via a sulfido bond. The polyvinyl acetal of the invention is useful for binders for ceramic forming and for binders for ink or paint.
Tunable Reactivation of Nanoparticle-Inhibited β-Galactosidase by Glutathione at Intracellular Concentrations
作者:Ayush Verma、Joseph M. Simard、Joseph W. E. Worrall、Vincent M. Rotello
DOI:10.1021/ja046572r
日期:2004.11.1
Positively charged trimethylammonium-functionalized mixed monolayer protected clusters (MMPCs) of different chain lengths (C-8 and C-11) have been used to bind beta-galactosidase through complementary electrostatic interactions, resulting in complete enzyme inhibition. This inhibition can be reversed in vitro by intracellular concentrations of glutathione (GSH), the main thiol component of the cell. The restoration of activity depends on the chain length of the monolayer. The activity of enzyme bound to particles with C-8 monolayer was completely restored by intracellular concentrations (1 - 10 mM) of GSH; however, little or no release was observed at extracellular GSH concentrations. In contrast, no restoration was observed for enzyme bound to the C-11 particles at any of the concentrations studied. Taken together, these studies demonstrate that the GSH-mediated release of enzymes bound to MMPCs can be tuned through the structure of the monolayer, a significant tool for protein and drug delivery applications.
US7056977B2
申请人:——
公开号:US7056977B2
公开(公告)日:2006-06-06
Programmed Formation of HCN Oligomers through Organosulfur Catalysis
作者:Caroline Grundke、Caleb Kong、Christopher J. Kampf、B. Frank Gupton、D. Tyler McQuade、Till Opatz
DOI:10.1021/acs.joc.1c01023
日期:2021.8.6
diaminomaleonitrile (DAMN, 1) is described starting from readily available acetone cyanohydrin as the source of hydrogen cyanide (HCN). Diaminomaleonitrile (DAMN) is known to be an important intermediate in heterocyclic and medicinal chemistry as well as being a possible precursor for the origin of life’s hypothesis within prebiotic chemistry. The mechanism of its formation through organosulfur catalysis has been investigated
Assessment of the morphology of mixed SAMs on Au nanoparticles using a fluorescent probe
作者:Renato Bonomi、Alessandro Cazzolaro、Leonard J. Prins
DOI:10.1039/c0cc02260h
日期:——
The distribution of thiols in mixed SAMs can be determined in a straightforward manner from spectrophotometric titrations using a fluorescent probe. A plot of saturation concentration as a function of mole fraction provides information on the number of headgroups involved in binding.
通过使用荧光探针进行分光光度滴定,可以直接确定混合 SAM 中硫醇的分布情况。饱和浓度与分子分数的函数关系图提供了参与结合的头基数的信息。