Comparative study of tumorigenicity in mice administered transplacentally or neonatally with metabolites of tryptophan and its related compounds

1980 ◽  
Vol 96 (2) ◽  
pp. 163-168 ◽  
Author(s):  
K. Fujii ◽  
M. Watanabe
Keyword(s):  
Comparative Study ◽  
Related Compounds

scholarly journals Comparative Study of Naphthoquinone Contents of Selected Greek Endemic Boraginaceae Plants - Antimicrobial Activities

2017 ◽  
Vol 12 (2) ◽  
pp. 1934578X1701200
Author(s):  
Teisa Tufa ◽  
Harilaos Damianakos ◽  
Konstantia Graikou ◽  
Ioanna Chinou
Keyword(s):  
Antimicrobial Activity ◽  
Nmr Spectroscopy ◽  
Comparative Study ◽  
Pathogenic Fungi ◽  
2D Nmr ◽  
Antimicrobial Activities ◽  
2D Nmr Spectroscopy ◽  
Chromatographic Separations ◽  
Esi Ms ◽  
Related Compounds

The cyclohexane (Ch) extracts of the roots of five Greek endemic Boraginaceae plants, Onosma kaheirei Teppner, O. graeca Boiss., O. erecta Sibth. & Sm., Alkanna sfikasiana Kit Tan, Vold and Strid and Cynoglossum columnae Ten, were investigated for the presence of alkannin/shikonin-related compounds. All species, s except C. columnae and O. erecta, were found to contain this type of compounds. Seven compounds were obtained after several chromatographic separations from the Ch extracts of the investigated plants: deoxyalkannin (1), 2″-( S)- α-methylbutyrylalkannin (2), isobutyrylalkannin (3), propionylalkannin (4), acetylalkannin (5), β-hydroxyisovalerylalkannin (6), and β,β-dimethylacrylalkannin (7). All structures were identified by 1D 1H-/13C- and 2D NMR spectroscopy, assisted also by ESI-MS. The extracts and the isolated compounds exhibiting an interesting antimicrobial profile when evaluated for their antimicrobial activity against six Gram-positive and -negative bacteria and three human pathogenic fungi.

Lignin and related compounds. I. A comparative study of catalysts for lignin hydrogenolysis

1969 ◽  
Vol 47 (5) ◽  
pp. 723-727 ◽  
Author(s):  
J. M. Pepper ◽  
Y. W. Lee
Keyword(s):  
Comparative Study ◽  
Raney Nickel ◽  
Lignin Degradation ◽  
Soluble Fraction ◽  
Degradation Products ◽  
Quantitative Estimation ◽  
Liquid Chromatographic Separation ◽  
Lignin Degradation Products ◽  
Liquid Chromatographic ◽  
Related Compounds

A detailed comparative study has been made of the effectiveness of various catalysts for the hydrogenolysis of spruce wood lignin. The catalysts studied were Raney nickel, 10% palladium–charcoal, 5% rhodium–charcoal, 5% rhodium–alumina, 5% ruthenium–charcoal, and 5% ruthenium–alumina. Lignin degradation products were obtained initially as a chloroform-soluble fraction which was then divided and studied as diethyl ether-soluble and -insoluble fractions. Gas–liquid chromatographic separation of the ether-soluble fraction made possible the characterization and quantitative estimation of many of the lower molecular weight lignin degradation products.The data indicate that rhodium, palladium, and a limited amount of Raney nickel produce similar results as do ruthenium and an excess of Raney nickel; however, with the latter catalysts the degradation is more severe. In particular, rhodium–charcoal and palladium–charcoal appear to offer interesting advantages as catalysts for lignin hydrogenolysis.

Antioxidant and cytotoxic activities of naturally occurring phenolic and related compounds: A comparative study

2007 ◽  
Vol 45 (9) ◽  
pp. 1770-1776 ◽  
Author(s):  
Yerra Koteswara Rao ◽  
Madamanchi Geethangili ◽  
Shih-Hua Fang ◽  
Yew-Min Tzeng
Keyword(s):  
Comparative Study ◽  
Cytotoxic Activities ◽  
Naturally Occurring ◽  
Related Compounds
Sign in / Sign up

Export Citation Format

Share Document