• Publications
  • Influence
Nematocidal activity of turmeric: synergistic action of curcuminoids.
A new curcuminoid, cyclocurcumin (IV), was isolated from the nematocidally active fraction of turmeric, the rhizome of Curcuma longa, together with three knownCurcuminoids, curculeroids (I, demethoxycurcumin and bisdemethoxy Curcumin), suggesting a synergistic action between them. Expand
Isolation and structure elucidation of gymnemic acids, antisweet principles of Gymnema sylvestre.
The structure of gymnemagenin, the sapogenin of the antisweet principles of Gymnema sylvestre, was established by X-ray analysis of the 3 beta,23;21 beta,22 alpha-di-O-isopropylidene derivative and the structure of deacylgymnemic acid was elucidated as the 3- O-beta-glucuronide from the carbon-13 nuclear magnetic resonance spectra. Expand
^ C-Nuclear Magnetic Resonance (NMR) Spectra of O-Acylglucoses. Additivity of Shift Parameters and Its Application to Structure Elucidations
CMR spectra of all positional isomers of mono-O-myristoyl-α- and β-D-glucopyranoses in pyridine-d5 are reported and discussed in connection with the anomalies of 1α- and 1β-O-acyl derivatives.Expand
Cytotoxic principles of a Bangladeshi crude drug, akond mul (roots of Calotropis gigantea L.).
Three cardenolide glycosides obtained as the cytotoxic principles of "akond mul" showed similar cell line selectivity to those of cardiac glycoside such as digoxin and ouabain: they are toxic to cell lines of human origin, but not to those from mouse at 2 micrograms/ml. Expand
Acacia concinna Saponins. II. Structures of Monoterpenoid Glycosides in the Alkaline Hydrolysate of the Saponin Fraction
From the AcOEt-soluble fraction of the alkaline hydrolyzate of the highly polar saponin fraction of pods of Acacia concinna, two monoterpenes, (2E)-2, 6-dimethyl-6-hydroxy-2, 7-octadienoic acidExpand
Studies on crude drugs effective on visceral larva migrans. I. Identification of larvicidal principles in betel nuts.
Determination of the larvicidal activities of fatty acids and aliphatic alcohols with various alkyl chain lengths, and of analogous compounds with various functional groups, suggested that the balance between hydrophilicity and hydrophobicity is important for the larVicidal activity. Expand
Z-E Isomerization of β-Methoxychalcones : Preferred Existence of E-Isomers in Naturally Occurring β-Methoxychalcones
Methylation of dibenzoylmethanes with diazomethane always gave Z-β-methoxychalcones, which are the products of kinetically controlled methylation of chelated enol forms of β-hydroxychalcones.Expand
Studies on crude drugs effective on visceral larva migrans. IV. Isolation and identification of larvicidal principles in pepper.
Eight new amide constituents together with seven known amides were isolated from pepper and their structures were determined by spectroscopic means and suggested that the strongest activity was exhibited by the tertiary amides possessing a ninecarbon chain between the aromatic group and the amine moiety. Expand
Synthesis and nematocidal activity of hydroxystilbenes
Various (E)-hydroxystilbenes were synthesized from (E)/(Z) mixtures of methoxystilbenes through a new (Z)-(E) isomerization method followed dy demethylation. The nematocidal activity appears whenExpand