Promotion of carbohydrate oxidation in the heart by some phenylglyoxylic acids
作者:Ian T. Barnish、Peter E. Cross、John C. Danilewicz、Roger P. Dickinson、David A. Stopher
DOI:10.1021/jm00136a009
日期:1981.4
phenylglyoxylic acids is described, many of which are able to promote carbohydrate oxidation in muscle tissue, thereby favorably altering the carbohydrate/fatty acid balance in situations where fatty acid utilization is elevated. Such situations are reported to occur in ischemic heart disease, particularly following myocardial infection. In an attempt to effectively deliver the phenylglyoxylic acids to the
Synthesis of Arylglyoxylic Acids and Their Collision-Induced Dissociation
作者:Kuldeep Wadhwa、Chengxi Yang、Paul R. West、Kris C. Deming、Sanjay R. Chemburkar、Rajarathnam E. Reddy
DOI:10.1080/00397910802369554
日期:2008.11.13
A variety of substituted arylglyoxylic acids (2a-g) were synthesized via oxidation of the corresponding aryl-methylketones (1a-e) using selenium dioxide or Friedel-Crafts acylation of phenol (3) with ethyl chlorooxoacetate and further transformations. It was found that the arylglyoxylic acids (2) undergo facile unimolecular dissociation with loss of carbon monoxide to give the corresponding arylcarboxylic acids (7) under collisionally induced mass spectrometric conditions.
Flumazenil abolishes midazolam-induced increase in the work of nasal breathing
Purpose: To evaluate the effects of midazolam sedation followed by flumazenil antagonism on the work of nasal breathing in normal humans.Methods: We measured minute ventilation through the nasal route, respiratory frequency, nasal resistance (R-n) and the work of nasal breathing under three conditions: awake, during midazolam sedation, and after flumazenil antagonism in eight healthy human subjects. A custom-made, partitioned face mask enabled nasal and oral airflow to be measured separately. To calculate R-n and the work of nasal breathing, nasal mask and oropharyngeal pressure was also measured.Results: Total resistive work spent on the upstream segment of the nasal route per minute (W-n) (J.min(-1)) was greater during midazolam sedation (3.6 +/- 2.9) than while awake (1.6 +/- 0.9) and after flumazenil antagonism (1.7 +/- 0.6), respectively (mean +/- SD) (P < 0.05). Total resistive work spent on the upstream segment of nasal breathing (W-n/V-nE) (J.L-1) increased from 0.31 +/- 0.14 to 0.75 +/- 0.61 after midazolam administration (P < 0.05) and decreased to 0.31 +/- 0.10 after flumazenil. Following midazolam administration, a strong correlation was observed between changes in W-n/V-nE and changes in (R-n r = 0.852, P < 0.0001), whereas there was no correlation between changes in W-n and changes in (R-n = 0.159, P = 0.279).Conclusion: The work of breathing spent on the upstream segment of the nasal route increases during midazolam sedation and returns to baseline after flumazenil antagonism.