Amino acid derived latent isocyanates: irreversible inactivation of porcine pancreatic elastase and human leukocyte elastase
作者:William C. Groutas、William R. Abrams、Michael C. Theodorakis、Annette M. Kasper、Steven A. Rude、Robert C. Badger、Timothy D. Ocain、Kevin E. Miller、Min K. Moi
DOI:10.1021/jm00380a010
日期:1985.2
were found to inhibitirreversibly both enzymes. Compound 10 was found to be a specific and selective inhibitor of human leukocyte elastase. In contrast to these, inhibitorsderivedfrom glycine methyl ester 1, D-valine methyl ester 4, and D-norvaline methyl ester 6 were found to be inactive. The results of the present study show that latent isocyanates derivedfrom appropriate aminoacids can serve as
L-Lysine-based hydrogelators can form supramolecular hydrogels over a wide pH range and contain inorganic salts and acids, especially, 3 forms hydrogels containing 1 M HCl and H2SO4 at 1 g/L. (C) 2004 Elsevier Ltd. All rights reserved.
l-Lysine-based supramolecular hydrogels containing various inorganic ions
The preparation of supramolecular hydrogels containing various inorganic acids and salts using L-lysine-based hydrogelators is conducted and their thermal stabilities, gel strengths, FT-IR spectra, and electron micrographs are measured. These hydrogelators can form supramolecular hydrogels over a wide pH range and contain inorganic acids and salts. The supramolecular hydrogels based on ester-type hydrogelators have good thermal stabilities (high Tgel), while the hydrogelator with a carboxyl group forms a thermally sensitive gel with high mechanical strength. Furthermore, the gelation mechanism is discussed using FT-IR spectroscopy and TEM observations.
利用基于 L-赖氨酸的水凝胶剂制备了含有各种无机酸和盐的超分子水凝胶,并测量了它们的热稳定性、凝胶强度、傅立叶变换红外光谱和电子显微照片。这些水凝胶剂可在较宽的 pH 值范围内形成超分子水凝胶,并含有无机酸和盐。基于酯类水凝胶剂的超分子水凝胶具有良好的热稳定性(高 Tgel),而带有羧基的水凝胶剂则能形成具有高机械强度的热敏凝胶。此外,还利用傅立叶变换红外光谱和 TEM 观察结果讨论了凝胶化机制。