Stable-Isotope Dimethylation Labeling Combined with LC−ESI MS for Quantification of Amine-Containing Metabolites in Biological Samples
作者:Kevin Guo、Chengjie Ji、Liang Li
DOI:10.1021/ac0704356
日期:2007.11.1
was found that deuterium labeling causes an isotopeeffect on the elution of labeled amines on RPLC but has no effect on HILIC LC. However, 13C-dimethylation does not show any isotopeeffect on either RPLC or HILIC LC, indicating that 13C-labeling is a preferred approach for relative quantification of amine-containing metabolites in different samples. The isotopicallylabeled 35 amine-containing analogues
Cephem and penem compounds having a styrylmethylene moiety at the 3-position in the cephem or penem ring to which a positively charged leaving group is bonded and wherein the leaving group contains a vicinal diol or is bonded to a unsubstituted or substituted catechol. The leaving group can be a positively charge nitrogen leaving group. Cephems include cephalosporins, cephamycins, carbacephems, and oxacephems. Penems include penems, carbapenems and oxapenems. Preferred cephems are cephalosporins. Preferred penems are carbapenems. Compounds exhibit antibiotic activity against Gram-negative bacteria and/or Gram-positive bacteria. Compounds exhibit antibiotic activity against bacteria which exhibit multi-drug resistance. Compounds of the invention exhibit antibiotic activity against bacterial strains which produce extended spectrum beta-lactamases (ESBL), which produce AmpC beta-lactamases or which produce a carbapenemase. Pharmaceutical compositions comprising one or more cephems or penems or methods of treatment of bacterial infections with such compounds and compositions.
MODIFIER FOR AROMATIC POLYESTER AND AROMATIC POLYESTER RESIN COMPOSITION COMPRISING THE SAME
申请人:TABATA Masayoshi
公开号:US20110224343A1
公开(公告)日:2011-09-15
The present invention provides a modifier for aromatic polyesters which enhances the melt fluidity of aromatic polyesters without a significant decrease in the heat resistance of the aromatic polyesters, and an aromatic polyester resin composition including the modifier for aromatic polyesters. The present invention relates to a modifier for aromatic polyesters comprising polyhydric phenol residues and residues of aromatic polycarboxylic acid, acid halide or acid anhydride thereof, and the modifier comprises a material having a structure composed of a first residue selected from the group consisting of divalent residues represented by Formula (I): —Ar—W
1
x
—Ar— and by Formula (II): —Ar—, the first residues being bonded to two identical or different second residues selected from the group consisting of monovalent residues represented by Formula (III):
and monovalent residues represented by Formula (IV): —O—C(O)—R
7
—.
[EN] 18-BETA-GLYCYRRHETINIC ACID DERIVATIVES WITH ANTI-TUMOR ACTIVITY<br/>[FR] DÉRIVÉS D'ACIDE 18?-GLYCYRRHÉTINIQUE AYANT UNE ACTIVITÉ ANTITUMORALE
申请人:UNIV BRUXELLES
公开号:WO2012022780A1
公开(公告)日:2012-02-23
The invention relates to the medical and cosmetic field, more precisely the field of anticancer treatment and treatment of inflammatory diseases and diabetes and the field of anti-aging or anti-wrinkling agents using newly synthesized 18β-glycyrrhetinic acid derivatives and there use in the treatment of said disorders or symptoms.
Oxidative cyclisation of N,N-dialkylcatechol amines to heterocyclic betaines via o-quinones: synthetic, pulse radiolytic and enzyme studies
作者:John Clews、Christopher J. Cooksey、Peter J. Garratt、Edward J. Land、Christopher A. Ramsden、Patrick A. Riley
DOI:10.1039/b006860h
日期:——
tyrosinase oxidation of phenols to o-quinones in which the o-quinone is formed in a single step and not via an intermediate catechol. Similar chemical and enzymatic oxidation of a higher homologue gives an analogous 1,2,3,4-tetrahydroquinolinium-6-olate. Pulse radiolysis studies show that this product is formed via a spiro intermediate and not by direct cyclisation to form the six-membered quinolinium ring