NOPR Collection:

Isolation and characterization of pectic polysaccharides from the fruits of Naringi crenulata

Sat, 01 Feb 2003 00:00:00 GMT

Title: Isolation and characterization of pectic polysaccharides from the fruits of Naringi crenulata Authors: Mondal, Saroj K; Ray, Bimalendu; Thakur, Swapnadip; Ghosal, Pradyot K Abstract: Pectic polysaccharides have been isolated from the fruits of Naringi crenulata by extraction with water. The water extract contains large amount of protein. The polymers present in the water extract are fractionated by graded precipitation with ethanol, anion exchange chromatography, and size exclusion chromatography. Characterization or the subtractions obtained therefrom by various chemical and physico-chemical methods of analysis reveals that the water extract contain pectic polymers substituted to various degrees with side chains comprising mainly or terminal, 1,4-, 1,6-, 1,3,6-linked galactose, together with lesser amounts of 1,2,4- and 1,3-linked galactose residues. Arabinose residues are terminal, 1, 5-, 1,3,5-linked. These polymers contain acetyl groups and give viscous solution in water. Page(s): 437-442

New flavonoid glycosides from Cassia occidentalis

Sat, 01 Feb 2003 00:00:00 GMT

Title: New flavonoid glycosides from Cassia occidentalis Authors: Purwar, Chhavi; Rai, Renu; Srivastava, Nidhi; Singh, J Abstract: Two flavonoid glycosides 3,2’-dihydroxy-7,8,4' –trimethoxy-flavone-5-O- {β-D-glucopyranosyl (1→2)}-β-D-galactopyranoside 1 and apigenin-7-O-β-D-allopyrano-side 2 have been isolated from the plant of Cassia occidentalis. The structures have been established on the basis of chemical evidences and spectroscopic method. Page(s): 434-436

1-(2', 6'-Dihydroxyphenyl)-β--glucopyranoside, a novel C-glycoside from Pterocarpus marsupium^†

Sat, 01 Feb 2003 00:00:00 GMT

Title: 1-(2', 6'-Dihydroxyphenyl)-β--glucopyranoside, a novel C-glycoside from Pterocarpus marsupium^† Authors: Suri, K A; Satti, N K; Gupta, B D; Suri, O P Abstract: Isolation and characterisation of a novel C-glycoside from Pterocarpus marsupium Roxb. (Leguminosae) is reported. The isolate coded as VS002 1, has been characterised as 1-(2', 6' dihydroxyphenyl)-β--glucopyranoside on the basis of spectroscopic data and derivatisation. Page(s): 432-433

Microwave assisted acetylation and deacetylation studies on the triterpenes isolated from Dysoxylum malabaricum and Dysoxylum beddomei

Sat, 01 Feb 2003 00:00:00 GMT

Title: Microwave assisted acetylation and deacetylation studies on the triterpenes isolated from Dysoxylum malabaricum and Dysoxylum beddomei Authors: Jayakumar, G; Ajithabai, M D; Santhosh, B; Veena, C S; Nair, Mangalam S Abstract: Phytochemical investigations on the leaves of Dysoxylum malabaricum and Dysoxylum beddomei result in the isolation of a number of triterpenes. Acetylation and deacetylation studies on some of the representative triterpenes show appreciable rate enhancement and increase of yield in the presence of microwave radiation. Details of isolation of triterpenes, acetylation and deacetylation procedures and their results form the subject of the paper. Triterpenes of three skeletal types namely lupane, tirucallane and cycloartane are examined. All the triterpenes examined indicate an increase of cytotoxicity with acetylation. Page(s): 429-431

NOPR Collection:

Isolation and characterization of pectic polysaccharides from the fruits of Naringi crenulata

New flavonoid glycosides from Cassia occidentalis

1-(2', 6'-Dihydroxyphenyl)-β--glucopyranoside, a novel C-glycoside from Pterocarpus marsupium†

Microwave assisted acetylation and deacetylation studies on the triterpenes isolated from Dysoxylum malabaricum and Dysoxylum beddomei

1-(2', 6'-Dihydroxyphenyl)-β--glucopyranoside, a novel C-glycoside from Pterocarpus marsupium^†