Research on Alkoxythiobenzamides, III: Synthesis of New 3,4,5-Trimethoxythiobenzamides and Related Thiomorpholides with Potential Antisecretory and Antiulcer Activity
trithiozine, were prepared by reaction of primary amines, acyclic secondary amines and various amino acids with methyl 3,4,5‐trimethoxydithiobenzoate (1a) or (3,4,5‐trimethoxythiobenzoylthio)acetic acid (1b). Some thiomorpholides 7 of alkoxyphenylalkanoic acids were prepared by thionation of the corresponding amides or from the appropriate ketones by the Willgerodt‐Kindler reaction.
As an advanced stage of glycation, glycated human serum albumin (G-HSA; glucose content, 2mol of 5-hydroxymethylfufural equivalent/mol of HSA) was incubated at 37°C up to 30d in 0.2M phosphate buffer, pH 7.4, with 100 μM Fe3+. G-HSA incubated for 30d (G-HSA-30(Fe)) was subsequently hydrolyzed at 110°C for 24h in 6N HCl. In the hydrolysate, N2-carboxymethyllysine (CML) was identified by cochromatography with synthesized CML on an amino acid analyzer. pI of HSA (4.8) shifted to 4.5 in G-HSA. A more acidic fraction, pI 4.3, appeared in G-HSA-30(Fe). CML content (mol of CML/mol of HSA) of HSA and G-HSA was as follows; 0 in HSA, 0.2 in HSA-30(Fe), 0.4 in G-HSA and 1.5 in G-HSA-30(Fe) pI 4.3. The amino acid compositions also changed in lysine, arginine and tyrosine at the advanced stage of the reaction.
Compounds and methods for therapeutic intervention in preventing diabetic complications and procedures for assessing a diabetic's risk of developing complications and determining the efficacy of therapeutic intervention
申请人:——
公开号:US20020111291A1
公开(公告)日:2002-08-15
Disclosed is a class of compounds which inhibit the enzymatic conversion of fructose-lysine into fructose-lysine-3-phosphate in an ATP dependent reaction in a newly discovered metabolic pathway. According to the normal functioning on this pathway, fructose-lysine-3-phosphate (FL3P) is broken down to form free lysine, inorganic phosphate and 3-deoxyglucosone (3DG), the latter being a reactive protein modifying agent. 3DG can be detoxified by reduction to 3-deoxyfructose (3DF), or it can react with endogenous proteins to form advanced glycation end-product modified proteins (AGE-proteins), which are believed to be a contributing cause of diabetic complications. Also disclosed are therapeutic methods of using such inhibitors to reduce formation of AGE-proteins and thereby lessen, reduce and delay diabetic complications and the effects of glycogen storage diseases, including Fanconi's syndrome. Methods for assessing a diabetic's risk of developing complications and for determining the efficacy of the disclosed inhibitor therapy by measuring the ratio of 3DG to 3DF in a biological sample following an oral dose of a fructose-lysine-containing food product are also disclosed.
Optimization of the Synthesis of the Cross-Linked Amino Acid Ornithinoalanine and Nuclear Magnetic Resonance Characterization of Lysinoalanine and Ornithinoalanine
unnatural aminoacids that can be formed in food submitted to thermal treatment, especially in alkaline conditions. The paper presents an optimization of the synthetic procedure for the preparation of a standard of OAL that could be very useful to study the toxicological and nutritional consequences of the presence of OAL in food. In the meantime, it was possible to develop a method based on nuclear magnetic
Le blocage de la lysine par la réaction de M<scp>AILLARD</scp>. I. Synthèse de N-(désoxy-1-<scp>D</scp>-fructosyl-1)- et N-(désoxy-1-<scp>D</scp>-lactulosyl-1)-<scp>L</scp>-lysines
作者:P. A. Finot、J. Mauron
DOI:10.1002/hlca.19690520609
日期:——
The authors describe a specific method for the preparation of Nϵ-(1-deoxy-D-fructosyl)-L-lysine, Nα-(1-deoxy-D-fructosyl)-L-lysine, their formyl derivatives, and Nα-formyl-ϵ-(1-deoxy-D-lactulosyl)-L-lysine, as well as Nα, Nϵ-di-(1-deoxy-D-fructosyl)-L-lysine. After purification by cation-exchange chromatography using volatile pyridine-acetic acid or pyridine-formic acid buffers, these compounds are