Detail of "17990-42-0"

Reference

Coupling SFE to uterotonic bioassay: an on-line investigation of the uterotonic activity of compounds from Grewia occidentalis (Tiliaceae)

Coupling SFE to uterotonic bioassay: an on-line investigation of the uterotonic activity of compounds from Grewia occidentalis (Tiliaceae). Mulholland, D. A.; Sewram, V.; Raynor, M.; Thornell, K.; Raidoo, D. M. ( Natural Products Research Group, School of Pure and Applied Chemistry, University of Natal, Durban 4041, S. Afr.). South African Journal of Botany, 68(1), 68-71 (English) 2002 NISC Pty Ltd. CODEN: SAJBDD. ISSN: 0254-6299. 134-96-3 and 17990-42-0 are cas registry numbers of chemicals which are used as reagents here. DOCUMENT TYPE: Journal CA Section: 1 (Pharmacology) Section cross-reference(s): 11 Grewia occidentalis (Tiliaceae) is a scrambling shrub or small tree sometimes used as a decorative garden plant. The plant is used for a wide range of medicinal and magical purposes, including the facilitation of child-birth. Aq. and supercrit. fluid exts. of the wood were shown to cause guinea pig uterine muscle contraction. The active compds. were identified as oleanonic acid and coniferaldehyde ((E)-4-hydroxy-3-methoxycinnamaldehyde). .

Direct-temperature mass spectrometric detection of volatile terpenoids and natural terpenoid polymers in fresh and artificially aged resins

Direct-temperature mass spectrometric detection of volatile terpenoids and natural terpenoid polymers in fresh and artificially aged resins. Scalarone, Dominique; van der Horst, Jerre; Boon, Jaap J.; Chiantore, Oscar (Department of Chemistry IPM, University of Turin, Turin 10125, Italy). 17990-42-0 and 471-74-9 are also occured in this study. Journal of Mass Spectrometry, 38(6), 607-617 (English) 2003 John Wiley & Sons Ltd. CODEN: JMSPFJ. ISSN: 1076-5174. DOCUMENT TYPE: Journal CA Section: 20 (History, Education, and Documentation) Section cross-reference(s): 80 Electron impact (EI) ionization and ammonia chem. ionization (NH3/Cl) direct-temp. mass spectrometry (DTMS) was used to characterize five natural terpenoid resins: dammar, mastic, colophony, Manila copal and sandarac. Compositional differences were highlighted by the identification of low mol. mass compds., ranging from di- to triterpenoids, and polymeric components, based on polycadinene and polycommunic acid. Photoaging processes occurring under accelerated indoor and outdoor exposure conditions were also investigated. NH3/Cl and tetramethylammonium hydroxide EI were applied to increase the sensitivity towards highly oxidized mols. Oxidn. and crosslinking reactions were found to affect mostly triterpenoid resins and diterpenoid abietane and pimarane mols. Oxidn. proceeds through a radical mechanism, generally starting from conjugated double bonds. Oxygen atoms are incorporated in the terpenoid structure in the form of alcs., ketones, and carboxylic acids. Oxidized cadinene oligomers released by pyrolytic degrdn. of the polycadinene fraction of dammar were detected even in unaged samples. Evidence is given indicating the occurrence of cleavages in the cross-linked polycommunic structure of aged sandarac and Manila copal. Bond scissions produce oligomeric fragments based on the communic acid structure and sufficiently volatile to be desorbed at low temp. DTMS measurements. .