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Tom J. Mabry

Bio: Tom J. Mabry is an academic researcher from University of Texas at Austin. The author has contributed to research in topics: Kaempferol & Sesquiterpene lactone. The author has an hindex of 42, co-authored 459 publications receiving 13375 citations. Previous affiliations of Tom J. Mabry include University of Illinois at Urbana–Champaign & Minia University.


Papers
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Book ChapterDOI
01 Jan 1975
TL;DR: The electron impact mass spectrometer has been applied successfully to all classes of aglycones and more recently to a number of different types of glycosides including mono-and di-C-glycosylflavones and mono-to- tetra-O-Glycosides as discussed by the authors.
Abstract: Electron impact mass spectrometry of both flavonoid aglycones and glycosides serves as a valuable aid in determining their structures, especially when only very small quantities (1.e. less than 1 mg) of the compounds are available. It has been applied successfully to all classes of flavonoid aglycones (Porter and Baldas, 1971) and more recently to a number of different types of glycosides including mono- and di-C-glycosylflavones and mono- to tetra-O-glycosides. In contrast, chemical ionization (CI), using methane as the reactant gas, has only been applied to a few aglycones and gives few diagnostic fragments except for flavanones and dihydroflavonols (Kingston and Fales, 1973); therefore, this account will be largely restricted to electron impact mass spectrometry of flavonoids.

78 citations

Journal ArticleDOI
TL;DR: Thirty-eight species, including thirteen previously uninvestigated genera, in ten families usually grouped in the Centrospermae were surveyed by electrophoresis and chromatography for the presence of betacyanin and anthocyanin pigments.

71 citations

Book ChapterDOI
01 Jan 1970
TL;DR: In this paper, fresh cut metallic sodium (2.5 g) was added cautiously in small portions to dry spectroscopic methanol (100 ml), stored in a glass container with a tightly fitting plastic stopper.
Abstract: Sodium methoxide (NaOMe). Freshly cut metallic sodium (2.5 g) was added cautiously in small portions to dry spectroscopic methanol (100 ml). The solution was stored in a glass container with a tightly fitting plastic stopper.

69 citations

Journal ArticleDOI
TL;DR: The sesquiterpene lactone chemistry is summarized for seventeen taxa of Parthenium including new detailed data for four species and new preliminary results for P. fruticosum , P. hispidum and P. rollinsianum .

68 citations


Cited by
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Journal ArticleDOI
TL;DR: The factors underlying the influence of the different classes of polyphenols in enhancing their resistance to oxidation are discussed and support the contention that the partition coefficients of the flavonoids as well as their rates of reaction with the relevant radicals define the antioxidant activities in the lipophilic phase.

8,513 citations

Journal ArticleDOI
TL;DR: A revised and updated classification for the families of the flowering plants is provided in this paper, which includes Austrobaileyales, Canellales, Gunnerales, Crossosomatales and Celastrales.

7,299 citations

Journal Article
TL;DR: Western medicine has not yet used flavonoids therapeutically, even though their safety record is exceptional, and suggestions are made where such possibilities may be worth pursuing.
Abstract: Flavonoids are nearly ubiquitous in plants and are recognized as the pigments responsible for the colors of leaves, especially in autumn. They are rich in seeds, citrus fruits, olive oil, tea, and red wine. They are low molecular weight compounds composed of a three-ring structure with various substitutions. This basic structure is shared by tocopherols (vitamin E). Flavonoids can be subdivided according to the presence of an oxy group at position 4, a double bond between carbon atoms 2 and 3, or a hydroxyl group in position 3 of the C (middle) ring. These characteristics appear to also be required for best activity, especially antioxidant and antiproliferative, in the systems studied. The particular hydroxylation pattern of the B ring of the flavonoles increases their activities, especially in inhibition of mast cell secretion. Certain plants and spices containing flavonoids have been used for thousands of years in traditional Eastern medicine. In spite of the voluminous literature available, however, Western medicine has not yet used flavonoids therapeutically, even though their safety record is exceptional. Suggestions are made where such possibilities may be worth pursuing.

4,663 citations

Journal ArticleDOI
TL;DR: In this article, two complementary colorimetric methods, aluminum chloride method and 2,4-dini trophenylhydrazine method, were used to determine the real content of total flavonoids in propolis.

3,899 citations

Journal ArticleDOI
TL;DR: Several high-quality investigations have examined the relationship between flavonoid structure and antibacterial activity and these are in close agreement, and future studies may allow the development of a pharmacologically acceptable antimicrobial agent or class of agents.

3,630 citations