Pittaya Tuntiwachwuttikul

Flavonoids in the black rhizomes of Boesenbergia panduta

Abstract 5-Hydroxy-7-methoxyflavanone, 5,7-dimethoxyflavanone, 5-hydroxy-7-methoxyflavone 5-hydroxy-7,4′-dimethoxyflavone, 5,7-dimethoxyfiavone, 5,7,4′-trimethoxyflavone, 5,7,3′,4′-tetramethoxyflavone, 5-hydroxy-3,7-dimethoxyflavone, 5-hydroxy-3,7,4′-trimethoxyflavone, 3,5,7-trimethoxyflavone and 5-hydroxy-3,7,3′,4′-tetramethoxyflavone have been isolated from the black rhizomes of Boesenbergia pandurata .

Cyanogenic and non-cyanogenic glycosides from Manihot esculenta

In addition to lotaustralin and linamarin, a novel cyanogenic glycoside, 2-((6-O-(beta-D-apiofuranosyl)-beta-D-glucopyranosyl)oxy)-2-met hylbutanenitrile , two novel non-cyanogenic glycosides, (2S)-((6-O-(beta-D-apiofuranosyl)-beta-D- glucopyranosyl)oxy)butane and 2-((6-O-(beta-D-apiofuranosyl)-beta-D-glucopyranosyl)oxy)propane, and a simple non-cyanogenic glycoside, ethyl beta-D-glucopyranoside, were isolated from an ethanolic extract of the fresh root cortex of Manihot esculenta. From a methanolic extract of the fresh leaves of this species lotaustralin and linamarin, and two flavonoid glycosides, kaempferol-3-O-rutinoside and quercetin-3-O-rutinoside were isolated.

A triterpenoid saponin from Maesa ramentacea

The structure of a piscicidal triterpenoid saponin (saponin A) isolated from the leaves of Maesa ramentacea has been shown to be 3-O-[[(alpha-rhamnopyranosyl (1-->2)-alpha-L-rhamnopyranosyl(1-->2)-beta-D-galactopyranosyl (1-->3)]-[beta-D-glucopyranosyl(1-->2)]-beta-D-glucuronopyranosyl] barringtogenol C21, 22-O-diangeloate. Extensive use was made of homo- and heteronuclear 2D NMR techniques.

Cyclohexane oxide derivatives from Kaempferia angustifolia and Kaempferia species

Abstract (−)-(3S,4R,5S,7S)-5-Benzoyloxymethyl-6-oxadicyclo-[4,1,0]hept-1-ene-3,4-diol 3-benzoate [(−)-pipoxide] and the two (+)-zeylenol related substances, (−)-(1R,2S,3R,4S)-2-benzoyloxymethylcyclohex-5-ene-1,2,3,4-tetrol 1,4-dibenzoate, and (1R,2S,3R,4S)-2-hydroxymethylcyclohex-5-ene-1,2,3,4-tetrol 1,4-dibenzoate, together with 2′-hydroxy-4,4′,6′-trimethoxychalcone, were isolated from the rhizomes of Kaempferia angustifolia, in addition to crotepoxide, boesenboxide and (+)-zeylenol. The rhizomes of an unnamed Kaempferia species have also been found to contain the zeylenol derivatives.

Phenylbutanoids from Zingiber cassumunar

Abstract Five novel phenylbutanoids have been isolated from the rhizomes of Zingiber cassumunar . 3,4-Dimethoxybenzaldehyde 2,4,5-trimethoxy-benzaldehyde are also reported from the same source.

Iridoid glucosides of Barleria lupulina

In addition ot the known compounds, barlerin, acetylbarlerin, shanzhiside methyl ester, acetylshanzhiside methyl ester and ipolamiidoside, four iridoid glucosides isolated from the leaves of Barleria lupulina have been identified as 6-O-p-methoxy-cis-cinnamoyl-8-O-acetylshanzhiside methyl ester, 6-O-p-methoxy-trans-cinnamoyl-8-O-acetylshanzhiside methyl ester, 6-O-p-cis-coumaroyl-8-O-acetylshanzhiside methyl ester and 6-O-p-trans-coumaroyl-8-O-acetylshanzhiside methyl ester.

Phytochemistry of the zingiberaceae

Abstract Zingiberaceae is one of the major tropical plant families. embers of the Zingiberaceae are famous for their use as spices and as medicinal herbs. Rhizomes of several species are also used as insect repellents. Many compounds with novel structures and a large number of biologically active compounds have been identified from these plants. This review focuses on the chemistry and biological activity of compounds isolated from the Zingiberaceous plants.

Triterpenoid glycosides from Schefflera lucantha.

Three new triterpenoid glycosides were isolated from the leaves of Schefflera lucantha Viguier. Based on the spectroscopic data, especially 2D NMR, the structures of glycosides have been established as 3-O-[alpha-L-rhamnopyranosyl (1-->2)-beta-D-glucopyranosyl (1-->2)-beta-D-glucuronopyranosyl] betulinic acid, 3-O-[alpha-L-rhamnopyranosyl (1-->2)-beta-D-xylopyranosyl (1-->2)-beta-D-glucuronopyranosyl]betulinic acid and 3-O-[alpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl (1-->2)-beta-D-glucuronopyranosyl]oleanolic acid.

Diterpenes from a Kaempferia species

Six novel diterpenes, sandaracopimaradien-9α-ol-1-one, sandaracopimaradien-1α,9α-diol, 6β-acetoxysandaracopimaradien-9α-ol-1-one, sandaracopimaradien-6β,9α-diol-1-one, 6β-acetoxysandaracopimaradien-1α,9α-diol and sandaracopimaradien-1α,6β,9α-triol have been isolated from the rhizomes of Kaempferia sp. The structures were assigned on the basis of their spectroscopic data and by chemical conversions. The crystal structures of the second and fifth compounds were also determined and the absolute stereochemistry of all the compounds established by CD methods

Identification ofStreptomyces sp. Tc022, an endophyte inAlpinia galanga, and the isolation of actinomycin D

Some endophytic actinomycetes (120) were isolated from the roots ofAlpinia galanga. Identification of these endophytes was based on their morphology and amino acid composition of the whole-cell extract. Most isolates were classified aStreptomyces sp. (82), with the remainder belonging toNocardia sp. (11),Microbispora sp. (3) andMicromonospora sp. (2). Eight isolates were unclassified and 14 were lost during subculture. The strain identified as endophyticStreptomyces sp. Tc022 strongly inhibitedColletotrichum musae andCandida albicans. This endophyte was cultured, the agar was extracted with organic solvent and the extract was purified on a column of silica gel to give a major component, which was identified to be actinomycin D on the basis of spectroscopic dat Actinomycin D showed antifungal activity againstColletotrichum musae andCandida albicans with the MIC of 10 and 20 mg ml−1, respectively.