Isomerism

Publication Title: 
Annual Review of Nutrition
Author(s): 
Emken, E. A.
Publication Title: 
Journal of Biochemical and Molecular Toxicology

Trans-fatty acids (TFAs) enter the diet through industrial processes and can cause adverse human health effects. The present study was aimed to examine the effects of dietary cis- and trans-fatty acids on the model organism Caenorhabditis elegans. Cis- or trans-18:1n9 triglycerides (25 ?M) caused no apparent changes in the numbers of viable progeny of wild-type N2 animals. However, in fat-3 mutants lacking delta-6-desaturase, the trans-isomer caused modest decreases in lifespan and progeny after three generations.

Author(s): 
Reisner, Kaja
Lehtonen, Marko
Storvik, Markus
Jantson, Tanel
Lakso, Merja
Callaway, J. C.
Wong, Garry
Publication Title: 
The Biochemical Journal

1. The activities of protein disulphide-isomerase (PDI) and thioredoxin in catalysing disulphide bond isomerization in a protein substrate were compared by using the standard assay, namely the re-activation of 'scrambled' RNAase. 2. The specific activity of PDI was 25-fold greater than that of thioredoxin. 3. The greater efficiency of PDI compared with thioredoxin is considered to be due more to the presence of multiple catalytic domains in PDI than to differences in their active-site sequences. 4.

Author(s): 
Hawkins, H. C.
Blackburn, E. C.
Freedman, R. B.
Publication Title: 
Drug Metabolism and Disposition: The Biological Fate of Chemicals

beta-Artemether (AM), the O-methyl ether prodrug of dihydroartemisinin (DHA), is an endoperoxide antimalarial. The biliary metabolites of AM in adult male Wistar rats were characterized with particular reference to potential antimalarial compounds and stable derivatives of free radical intermediates. [13-(14)C]-AM (35 micromol kg(-1), i.v.) was administered to anesthetized rats. Within 0 to 3 h, 38.6 +/- 4.8% (mean +/- S.D., n = 6) of the radiolabel was recovered in bile; the 0- to 5-h recovery was 42.3 +/- 4.3%.

Author(s): 
Maggs, J. L.
Bishop, L. P.
Edwards, G.
O'Neill, P. M.
Ward, S. A.
Winstanley, P. A.
Park, B. K.
Publication Title: 
Planta Medica

In Ayurvedic medicine, East Indian Sandalwood is an important remedy for the treatment of both somatic and mental disorders. In this investigation, the effects of inhalation of East Indian Sandalwood essential oil and its main compound, alpha-santalol, on human physiological parameters (blood oxygen saturation, respiration rate, eye-blink rate, pulse rate, skin conductance, skin temperature, surface electromyogram, and blood pressure) and self-ratings of arousal (alertness, attentiveness, calmness, mood, relaxation and vigor) were studied in healthy volunteers.

Author(s): 
Heuberger, Eva
Hongratanaworakit, Tapanee
Buchbauer, Gerhard
Publication Title: 
Pharmaceutical Biology

CONTEXT: The roots of Plumbago zeylanica Linn. (Plumbaginaceae) are reputed to have a wide spectrum of therapeutic properties in the Ayurvedic system of medicine. They are useful in curing many ailments such as skin diseases, diarrhea, plague and leprosy. OBJECTIVE: The study was aimed at isolating, separating and evaluating the antimicrobial properties of compounds such as neoisoshinanolone and 1-epineo-isoshinanolone from the roots of P. zeylanica. MATERIALS AND METHODS: The crude petroleum ether extract of roots of P.

Author(s): 
Jetty, Annapurna
Subhakar, Chennupati
Rajagopal, Duddumpudi
Jetty, Manasa
Subramanyam, Mukkamala
Marthanda Murthy, Madugula
Publication Title: 
Planta Medica

The use of chromatographic assays to assess the residual complexity of materials that are purified from natural sources by chromatographic means is, in a sense, a case of the fox watching the henhouse. Beside their static residual complexity, which is intrinsic to their metabolic origin, biologically active natural materials can also be involved in chemical reactions that lead to dynamic residual complexity.

Author(s): 
Chen, Shao-Nong
Lankin, David C.
Chadwick, Lucas R.
Jaki, Birgit U.
Pauli, Guido F.
Publication Title: 
Clinical Biochemistry

Tracer-based metabolomics is a systems biology tool that combines advances in tracer methodology for physiological studies, high throughput "-omics" technologies and constraint based modeling of metabolic networks. It is different from the commonly known metabolomics or metabonomics in that it is a targeted approach based on a metabolic network model in cells.

Author(s): 
Paul Lee, W.-N.
Wahjudi, Paulin N.
Xu, Jun
Go, Vay Liang
Publication Title: 
Chemistry & Biology

Endogenous mechanisms in the resolution of acute inflammation are of interest because excessive inflammation underlies many pathologic abnormalities. We report an aspirin-triggered DHA metabolome that biosynthesizes a potent product in inflammatory exudates and human leukocytes, namely aspirin-triggered Neuroprotectin D1/Protectin D1 [AT-(NPD1/PD1)]. The complete stereochemistry of AT-(NPD1/PD1) proved to be 10R,17R-dihydroxydocosa-4Z,7Z,11E,13E,15Z,19Z-hexaenoic acid.

Author(s): 
Serhan, Charles N.
Fredman, Gabrielle
Yang, Rong
Karamnov, Sergey
Belayev, Ludmila S.
Bazan, Nicolas G.
Zhu, Min
Winkler, Jeremy W.
Petasis, Nicos A.
Publication Title: 
Journal of Agricultural and Food Chemistry

Bioactive components in food plants can undergo dynamic processes that involve multiple chemical species. For example, 2'-hydroxychalcones can readily isomerize into flavanones. Although chemically well documented, this reaction has barely been explored in the context of cell-based assays.

Author(s): 
Simmler, Charlotte
Hajirahimkhan, Atieh
Lankin, David C.
Bolton, Judy L.
Jones, Tristesse
Soejarto, Djaja D.
Chen, Shao-Nong
Pauli, Guido F.

Pages

Subscribe to RSS - Isomerism