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Showing papers in "Phytochemistry in 1985"


Journal ArticleDOI
TL;DR: In this article, a standard method of analysis of proanthocyanidins based on use of an n-BuOH-HCl-FeIII mixture is given, and the ratio of absorbance maxima of the cyanidin (550 nm) produced to that near 280 nm for the original procyanidin polymer solution was ∼ 3.5.

2,074 citations


Journal ArticleDOI
TL;DR: The 13 C NMR chemical shifts of 130 naturally occurring steroidal sapogenins and saponin derivatives published up to 1983 are listed and a number of methods for signal assignment are explained as discussed by the authors.

549 citations


Journal ArticleDOI
TL;DR: Ferulic acid ethers accounted for 1.1% dry wt of alkali extracted lignin and might explain the high solubility of Gramineae lignins in soda.

459 citations


Journal ArticleDOI
TL;DR: In this paper, a review of the generation, occurrence and action of singlet oxygen in plant tissue is presented, focusing on its formation from triplet sensitizers and its reactivity with molecules of biological importance such as lipids and amino acids.

336 citations


Journal ArticleDOI
TL;DR: The alkaloid content (nicotine, nornicotine, anabasine, and anatabine) in leaves and roots of 60 Nicotiana species were analyzed and there was no clearcut correlation between alkaloids amounts and subgeneric or sectional classification.

241 citations


Journal ArticleDOI
TL;DR: In laboratory culture, the hydrocarbon content of these new strains is very high, from 30 to 60% of the dry biomass, for the two races the greatest hydrocarbon productivity takes place during the active growth phase.

225 citations


Journal ArticleDOI
TL;DR: Comparison between the effectiveness of various copper chelators showed that Tropolone is one of the most potent inhibitors of mushroom tyrosinase; 50% inhibition was observed with 0.4 × 10−6 M tropolone.

199 citations


Journal ArticleDOI
TL;DR: In this article, the inhibitory properties of three plant alkaloids, deoxynojirimycin, 2,5-dihydroxymethyl-3,4-dhydroxypyrrolidine and 1,5 dideoxy-1,5 -imino-D -mannitol towards glycosidases from several sources have been compared.

169 citations


Journal ArticleDOI
TL;DR: A review on the application of plant molluscicides in the control of schistosomiasis is presented in this paper, together with criteria for activity and laboratory bioassays.

166 citations


Journal ArticleDOI
TL;DR: The current staus of research of free and glycosylated alkaloids occuring in members of the genus Crinum is reviewed in this paper, where the distribution, isolation, spectral properties, structural properties, inter conventions and biological acitivities of these alkaloid are presented.

159 citations


Journal ArticleDOI
TL;DR: It is concluded that the three sesquiterpene lactones secreted in the latex provide a significant barrier to herbivory in chicory, although the phenolics and notably cichoriin also protect the plant from insect feeding.

Journal ArticleDOI
TL;DR: The tuberous roots, but not other organs, of sweet potato contained large quantities of two proteins which accounted for more than 80% of the total proteins, and these proteins decreased in preference to other proteins during sprouting.

Journal ArticleDOI
TL;DR: The results indicate that the activities of hydrolysable tannins were dependent on the number of galloyl or hexahydroxydiphenoyl groups and those of condensed ones on the degree of condensation.

Journal ArticleDOI
TL;DR: The results suggest that ascorbate can reduce the quercetin oxidized by the linoleic acid radical back to quercetic acid, which is likely to be due to reduction by the reagent of the linolesic acidradical formed as an intermediate during lipoxygenation.

Journal ArticleDOI
TL;DR: Seven species of fresh mangrove leaves were homogenized using chloroform—methanol and the extract was diluted with water to precipitate out triterpenoids and sterols, which were separated into neutral and acidic fractions.

Journal ArticleDOI
TL;DR: Studies are described of the association of a group of biosynthetically inter-related polyphenols based on gallic acid and D -glucose with the protein bovine serum albumin, interpreted in terms of structure-activity relationships in protein-polyphenol complexation.

Journal ArticleDOI
TL;DR: Nine branched hydrocarbons of the botryococcene type have been isolated from the green alga Botryococcus braunii and the structures of four new botryOCoccenes were elucidated.

Journal ArticleDOI
TL;DR: In this article, the authors used capillary GC and HPLC in soft fruits to determinequinine acid and glucose esters of hydroxycinnamic acids and glucosides of both hydroxycinamic and hydroxybenzoic acids.

Journal ArticleDOI
TL;DR: In this article, normal and high-amylose maize and pea starches (gene ae and ra respectively) were studied during gelatinization by their swelling and solubility patterns, as well as by differential scanning calorimetry.

Journal ArticleDOI
TL;DR: Agarwal et al. as mentioned in this paper isolated 20 flavonol methyl ethers displaying nine different oxygenation patterns in Gutierrezia microcephala, including 11 new flavonols.

Journal ArticleDOI
TL;DR: Trans-Zeatin, trans-zeatin riboside, their dihydro derivatives, isopentenyladenine and isopENTenyladenosine have been identified and quantified in Seasol, a commercial extract of Tasmanian Giant Bull kelp, Durvillea potatorum.

Journal ArticleDOI
TL;DR: In this paper, Rice bran hemicellulose was fractionated by ammonium sulphate precipitation, ion-exchange chromatography and enzymatic techniques, and it was found that the mixture consisted mainly of highly branched arabinoxylan and xyloglucan.

Journal ArticleDOI
TL;DR: In this paper, total lipid extracts from potato tubers and tobacco leaves are separated into lipid classes by two-step HPLC using a silicic column, and the main polar lipids (MGDG, DGDG, PC, PE, PG) from both plant tissues can be collected and further separated into component molecular species on a simplified HPLC system with a C18 column eluted in an isocratic mode with a polar solvent.

Journal ArticleDOI
TL;DR: Active compounds isolated from P. oblonga include a novel norsesquiterpene γ-lactone, the tiglic esters of two novel 5,6-dihydro-5-hydroxy-2-pyrones, nectriapyrone, 4-hydroxyphenylethanol, 5-methylmellein and furan-2,5-dicarboxylic acid.

Journal ArticleDOI
TL;DR: Koenoline, a carbazole alkaloid, has been isolated from the root bark of Murraya koenigii for the first time as a natural product and exhibited cytotoxic activity against the KB cell-culture test system.

Journal ArticleDOI
TL;DR: The essential oil of A. galanga, a common spice in Malaysia, was prepared from fresh and dried rhizomes and analysed by means of capillary GC and GC/MS.

Journal ArticleDOI
TL;DR: The berberine bridge-forming enzyme (BBE) has been found in 66 samples taken from differentiated plants and from cell suspension cultures and was shown to be homogeneous by gel electrophoresis.

Journal ArticleDOI
TL;DR: A compilation of different steroid substrates, their metabolises and the microorganisms used for the transformations is included covering the literature during the period 1984-mid 1987 as discussed by the authors, with special reference to the newer technniques which are being employed for better yields of desired metabolises.

Journal ArticleDOI
TL;DR: Two fractions obtained after chromatography of lignosulphonates on Sephadex G-50 are indicated, indicating that laccase possesses both polymerization and depolymerization activity though the former was predominant.

Journal ArticleDOI
TL;DR: Cultured roots were obtained from calluses of Duboisia leichhardtii, D. myoporoides and D. hopwoodii and produced both tropane and pyridine-type alkaloids.