Cassiadinine, a new chromone alkaloid and (+)-6-hydroxymellein, a new dihydroisocoumarin isomer have been isolated together with three triterpenoids, cycloart-23-en-3β,25-diol, friedelin and betulin, a chromone derivative, 5-acetonyl-7-hydroxy-2-methylchromone and γ-sitosterol from the petrol and chloroform extracts of the flowers of Cassia siamea. © 1986.

K M BISWAS

H MALLIK

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Cassiadinine, a chromone alkaloid and (+)-6-hydroxy-mellein, a dihydroisocoumarin from Cassia siamea

Phytochemistry

The number of carbons represented by each signal of the phenylindoles 1, 4, and 5 is measured quantitatively by integration of their 13C NMR spectra, recorded after adding chromium(III) acetylacetonate to the sample solutions as a paramagnetic relaxation agent. Their carbon chemical shifts are assigned unambiguously; the literature assignments of 4 are confirmed. By a comparative study of the carbon chemical shifts of 1,4, and 5, those of 2 and 3 are also assigned. The ortho carbons of the phenyl group of 4 resonate upfield with respect to the para carbon. The ortho carbons of the 2- and 3-phenyl moieties of 1 3 and 5, however, are found to absorb downfield from the corresponding para carbons, probably because of steric and/or electronic effects exerted by their neighbouring phenyl group.

Monatshefte für Chemie - Chemical Monthly

Nuclear Magnetic Resonance VI[1]. Some Quantitative Applications of Carbon-13 NMR Spectroscopy to Phenylindoles

The cationic form of β-galactosidase (EC 3.2.1.23) from the germinating seeds of Vigna sinensis has been separated from its other isoforms by DEAE-cellulose (DE-52) column chromatography and further purified by gel filtration and affinity chromatography. Polyacrylamide gel electrophoresis of the purified enzyme imparted a single protein band. The molecular mass of the enzyme as determined by Sephadex G-150 gel filtration is 58,800 Da. The optimum temperature and the optimum pH are 60 °C and 4.5, respectively. Most of the metal ions tested were inhibitory to the enzyme activity. The enzyme has Km for p-nitrophenyl β-d-glactoside and o-nitrophenyl β-d-galactoside of 0.56 and 2.0 mm, respectively. The Ki values of galactose and lactose are 2.4 and 70.0 mm, respectively. The energy of activation of PNPG for the enzyme is 10.3 kcal/mol. © 1986.

Archives of Biochemistry and Biophysics

Cationic form of Î²-galactosidase in the germinating seeds of Vigna sinensis (Linn) Savi

Isopongaglabol and 6-methoxyisopongaglabol, two new hydroxyfuranoflavones, together with two furanoflavones 5-methoxyfurano(8,7-4″,5″)flavone and 5-methoxy-3′,4′-methylenedioxyfurano(8,7-4″,5″)flavone, two simple flavones, desmethoxykanugin and fisetin tetramethyl ether, a chromenoflavanone, ovalichromene B, two triterpenes, cycloart-23-ene-3β,25-diol and friedelin, and β-sitosterol-β-d-glucoside were isolated from the petrol and CHCl3 extracts of the flowers of Pongamia glabra. The structures of isopongaglabol and 6-methoxyisopongaglabol have been established as 4′-hydroxyfurano(8,7-4″,5″)flavone and 4′-hydroxy-6-methoxyfurano(8,7-4″,5″)flavone, respectively, on the basis of the spectral evidence and they have been confirmed by synthesis. © 1982.

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422