Journal ArticleDOI
Mass Spectrometry in Structural and Stereochemical Problems. XXXII.1 Pentacyclic Triterpenes
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This article is published in Journal of the American Chemical Society.The article was published on 1963-11-01. It has received 822 citations till now. The article focuses on the topics: Pentacyclic Triterpenes.read more
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Journal ArticleDOI
α-Amylase inhibitory activity of some Malaysian plants used to treat diabetes; with particular reference to Phyllanthus amarus
TL;DR: Results revealed that the oleanolic acid and ursolic acid (2:1) mixture was a potent alpha-amylase inhibitor with IC(50)=2.01 microg/ml (4.41 microM) and that it contributes significantly to the alpha-AMylase inhibition activity of the extract.
Journal ArticleDOI
Hydrocarbons of geochemical significance in microscopic algae
TL;DR: Information on hydrocarbon production by twelve species of algae, morphologically similar to fossil forms, including Anacystis cyanea, A. montana, Spirulina platensis, Lyngbya aestuarii, Chroococcus turgidus, Chlorella pyrenoidosa, Coelastrum microsporum, Tetraedron sp.
Journal ArticleDOI
Chemosystematics and diagenesis of terpenoids in fossil conifer species and sediment from the Eocene Zeitz formation, Saxony, Germany
TL;DR: The biomarker contents of three fossil conifer species (Athrotaxis couttsiae, Taxodium balticum, Pinus palaeostrobus) and the clay sediment from the Eocene Zeitz formation, Germany, have been analyzed by gas chromatography-mass spectrometry as mentioned in this paper.
Book ChapterDOI
Mass Spectrometry in Organic Geochemistry
A. L. Burlingame,H. K. Schnoes +1 more
TL;DR: The potential of mass spectrometers for the solution of structural problems has been recognized by the organic chemical community in general, and since then rather extensive and sophisticated use has been made of the technique for structural studies on organic compounds as discussed by the authors.
Journal ArticleDOI
A cadinene biopolymer in fossil and extant dammar resins as a source for cadinanes and bicadinanes in crude oils from South East Asia
TL;DR: In this paper, the chemical composition of a fossil resin from a Miocene outcrop in Brunei, South East Asia, is compared with its extant counterpart dammar, obtained from trees of the family Dipterocarpaceae, to establish the nature of the precursor of bicadinanes.
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13C NMR spectra of pentacyclic triterpenoids--a compilation and some salient features
Shashi B. Mahato,Asish P. Kundu +1 more