γ-Pyrone derivatives fromHalenia corniculata
From 500 g of the epigeal part of Halenia corniculata (L.) Cornaz., collected in the Pribaikal region of the Buryat ASSR in July 1975, by extraction with 70% ethanol followed by treatment with chloroform we have isolated 32.7 g of extractive substances. Chromatography of the chloroform extract on silica gel with elution by chloroform yielded substances (i) and (2) of xanthone nature, and chloroform-ethanol (9:1) yielded luteolin, which was identified by its UV, mass, and PMR spectra and by comparison with an authentic sample [i].
Xanthones of the Gentianaceae—III
Abstract The root of Frasera caroliniensis Walt. has been shown to contain 1-hydroxy-2,3,4,7-tetramethoxyanthone ( 1 ), 1-hydroxy-2,3,4,5-tetramethoxyxanthone ( 6 ), 1-hydroxy-2,3,7-trimethoxyxanthone ( 9 ), 1-hydroxy-2,3,5-trimethoxyxanthone ( 11 ), swerchirin ( 15 ), a swerchirin glycoside ( 16 ), 1,3-dihydroxy-4,5-dimethoxyxanthone ( 18 ), and a compound that yields 1,2,3,5,8-pentamethoxyxanthone ( 19 ) on methylation. The new xanthones have been synthesized by a general method from suitable benzophenone precursors by elimination of a OMe group under strongly basic conditions. This method has also been used to prepare 1,2,3,4,8-pentamethoxyxanthone and 1,3,4,8-tetramethoxyxanthone.
Influence of Diluted Spent Wash of Sugar Industries Application on Yield of and Nutrient Uptake by Sugarcane and Changes in Soil Properties
A pot experiment was conducted to study the effect of irrigation with tube well water (S0) as well as with spent wash diluted for 25 (S25), 50 (S5O) and 100 (S100) times on yield of and nutrient uptake by sugarcane grown on Typic Chromustert. The results revealed that application of spent wash diluted at any level increased the sugarcane yield and nutrient uptake significantly over S0. Less diluted spent wash gave higher yield of biomass than the concentrated one. Though, there was tendency for slight increase in the soil salinity due to use of spent wash, yet the nutrient availability of P, K and S increased considerably. Further, there was indication of betterment in some physical conditions of soil.