Aliphatic constituents from Duboisia myoporoides

Four new compounds, isolated from the leaves and stems of Duboisia myoporoides have been characterized as 6-methyldotriacontane, hentriacontanyl tetratriacontanoate, 3-hydroxydotriacontan-28-one and 4-pentatriacontanone, respectively, by spectral data and chemical studies.     

Aliphatic hydroxy-ketones from Curculigo orchioides rhizomes

Two new aliphatic hydroxy-ketones, isolated from the rhizomes of Curculigo orchioides, have been characterized as 27-hydroxytriacontan-6-one and 23-hydroxytriacontan-2-one, respectively, by spectral data and chemical studies.     

Aliphatic compounds from Curculigo orchioides rhizomes

21-Hydroxytetracontan-20-one and 4-methylheptadecanoic acid have been isolated from the rhizomes of Curculigo orchioides and characterized on the basis of chemical and spectroscopic evidence.     

Three triterpenes and other terpenoids from Catha cassinoides

The investigation of stems and leaves of Catha cassinoides afforded, in addition to sitosterol, β-amyrin, ursolic acid, lup-20(29)-en-3β,30-diol and friedelin, three new pentacyclic triterpenes: 30-hydroxyfriedelan-3-one, 29-hydroxyfriedelan-3-one and 3-oxo-friedelan-29-oic acid. The structures ofthese were determined by spectral studies and correlations, and were confirmed by X-ray analysis of 29-hydroxyfriedelan-3-one acetate.     

Aliphatic compounds from Costus speciosus roots

Two new compounds G and H isolated from the roots of Costus speciosus have been characterized as 8-hydroxytriacontan-25-one and Me tritriacontanoat     

Sesquiterpenoid stress compounds from Nicotiana species

Solavetivone, 3-hydroxysolavetivone, solanascone, phytuberin and phytuberol were identified as stress compounds in leaves of Nicotiana tabacum cv Samsun NN. N. sylvestris, which is the maternal progenitor of N. tabacum, produced all the above compounds except 3-hydroxysolavetivone. In the F₁, hybrid of N. tabacum and N. glutinosa, all the stress compounds produced by N. tabacum and N. glutinosa, respectively, were accumulated.     

A novel withanolide from Datura quercifolia

A novel withanolide, 5α,12β-dihydroxy-1-oxo-6α,7α-epoxy-(22R)-witha-2,24 dienolide was isolated from a benzene extract of fresh leaves of Datura quercifolia. The structure was established by chemical and spectroscopic methods.     

Sapogenins from Guaiacum officinale

Acid hydrolysis of the saponins from the stem bark of Guaiacum officinale yielded the new sapogenin 3β,20η-dihydroxy-30-norolean-12-en-28-oic acid and the artifacts 3β-hydroxy-30-norolean-12,19-dien-28-oic acid and its methyl ester. Larreagenin, sitosterol and oleanolic acid were also isolated.     

Aliphatic and aromatic amines during development of Nicotiana tabacum

Putrescine, spermidine, spermine, tyramine and phenethylamine have been analysed in the apical parts, leaves, stems, flowers and roots of the tobacco p     

Triterpenes and neoflavonoids of Calophyllum lankaensis and Calophyllum thwaitesii

The petrol extracts of the leaves of Calophyllum lankaensis and C. thwaitesii yielded D:A-friedo-oleanan-3-one, 28-hydroxy-D:A-friedo-oleanan-3-one (canophyllol), 28-oxo-D:A-friedo-oleanan-3-one (canophyllal calozeylanic acid, thwaitesic acid, isothwaitesic acid and apetalactone. Thwaitesic acid and iso-thwaitesic acid are two novel neoflavonoids.     

Effect of phenolic compounds in Lycopersicon esculeutum on the synthesis of ethylene

Caffeic, coumaric, sinapic and ferulic acids and naringenin were found in green tomato fruit, Chlorogenic acid accounted for 75% of the total phenolics in mature green fruit but only 35% in ripe fruit. There was very little change in the phenolic composition of the flesh of the fruit during ripening, whereas in the skin, naringenin increased markedly at the onset of the climacteric and three unidentified compounds increased during the climacteric rise. The increase in the concentration of naringenin was accompanied by an increase in the production of ethylene in the skin. Investigation of three systems producing ethylene from 4-methylmercapto-2-oxobutyric acid in the presence of peroxidase, showed that only p`-coumaric acid or naringenin were capable of acting as phenolic substrates, the other phenolic compounds being inhibitory.     

8-Hydroxydotriacontan-30-one and other constituents from Duboisia myoporoides

In addition to the known constituents betulonic acid, ursolic acid, tetratriacontanoic acid and dotriacontanol, a new compound isolated from the leaves     

Biosynthesis of ticloidine in Physalis peruviana

The aerial parts and roots of Physalis peruviana (Cape Gooseberry) have been shown to contain tigloidine (3β-tigloyloxytropane) and 3α-tigloyloxytropane. The tiglic acid moiety of these alkaloids is derived from l-iSoleucine.     

An extracellular arabinogalactan-protein from Nicotiana tabacum

An extracellular arabinogalactan-protein was obtained from suspension-cultured tobacco cells. It seemed to be a homogeneous preparation from the results of gel-filtration, ultracentrifugation and disc gel electrophoresis. Its MW was estimated to be 2.24 × 10⁵ and its sedimentation coefficient (S_20,w) was calculated to be 5.07 S. It consisted of arabinose (40.0%), galactose (36.2%), rhamnose (0.8 %), glucuronic acid (10.0 %), glucosamine (0.2 %), galactosamine (0.1%) and protein (5.5 %). The sugar moiety appeared to be a typical arabino-3,6-galactan. A d-glucuronic acid residue was present as the non-reducing terminal group and was attached to C(O)-6 of a d-galactosyl residue by β-linkage.     

Tropane alkaloids from Anthocercis and Anthotroche

In addition to known tropane alkaloids, 3α-iso-butyryloxytropan-6β-ol and 3α-n-butyryloxytropane have been characterized as respective components of the aerial parts of two subspecies of Anthocercis albicans. Aponoratropine, not previously recorded as a natural product, has been detected in the leaves of Anthotroche myoporoides and A. walcottii; similarly aponorhyoscine is indicated as a component of the roots of a subspecies of Anthocercis genistoides.     

New 8-hydroxyflavonoids from Solanum section Androceras

Five new 8-hydroxyflavonoids have been identified from leaves of Solanum section Androceras: 8-methoxymyricetin 3,7,4′-trimethyl ether; 8-hydroxymyricetin 3,7,4′-trimethyl ether; 8-hydroxymyricetin 8-O-glucosylxyloside 3,7,4′-trimethyl ether; 8-hydroxychrysoeriol 7-methyl ether; 8-hydroxychrysoeriol 7-O-glucoside.     

An N-acylamino acid acylase from Nicotiana tabacum leaves

An N-acylamino acid acylase was partially purified from tobacco (Nicotiana tabacum) leaves and some of its properties are described. It hydrolyses N-acetylarginine, N-acetylmethionine, N-acetylcysteine and to a lesser extent N-formylmethionine. It does not appreciably hydrolyse N-formyl peptides and is therefore unlikely to be involved in protein synthesis.     

Tropane alkaloids from Schizanthus hookeri

Tropine, a pair of diastereoisomeric hygrolines and two new tropane alkaloids; 3α-senecioyloxytropan-6β-ol and 6β-angeloyloxytropan-3α-ol, were isolated from roots of Schizanthus hookeri.     

Sulphides and furanones from steam volatile oils of Allium fistulosum and Allium chinense

The constituents of the steam volatile oils from two kinds of Allium fistulosum, A. fistulosum var. caespitosum and A. chinense, have been investigated by GC and spectral techniques (IR, UV, GC/MS, ¹H NMR and ¹³C NMR). The compounds identified from the neutral fraction of each volatile oil included sulphides, thiolanes, alcohols, aldehydes, ketones, furanones and others. Among the sulphur compounds, dipropyl disulphide comprised ca 28% of A. fistulosum oil, ca 23% of A. fistulosum var. caespitosum oil and ca 30% of A. chinense oil. A. fistulosum oil was characterized by a large quantity of tridecan-2-one (ca 52%) and 2,3-dihydro-2-octyl-5-methylfuran-3-one (ca 16%). Also, a large amount of 2,3-dihydro-2-hexyl-5-methylfuran-3-one (ca 20%) was isolated from A. chinense oil.     

Cestric acid,a caffeic acid ester from Cestrum euanthes

Cestric acid, a new phenolic ester was isolated from leaves of Cestrum euanthes. By means of GC, HPLC, mass spectroscopy, GC/MS, and ¹³C NMR, it was shown to be an ester of caffeic acid with glucaric acid. The ester occurs as an equilibrium mixture of four isomers.