Nimbya alternantherae is a leaf spot fungus isolated from Alternanthera philoxeroides.It could produce phytotoxin to Alternanthera philoxeroides in several kinds of liquid media,especially in modified Fries.The filtra...Nimbya alternantherae is a leaf spot fungus isolated from Alternanthera philoxeroides.It could produce phytotoxin to Alternanthera philoxeroides in several kinds of liquid media,especially in modified Fries.The filtrate of the pathogen was chromatographed on a DM-130 colophony column eluting with methanol,and evaporation of the solvent gave a brown mush.The crude product was then extracted with ethyl acetate.The toxin could be purified as white needles by re-crystallizing from benzene and acetone（volume ratio is 1∶1） and silica gel chromatograph.The results of elemental analysis,MS,IR and NMR indicate that molecular weight of the toxin was 240,formula was C11H12O6,and its chemical name was 2-acetyl-3,4-dihydroxy-5-methoxyphenyl-acetic acid（Vulculic acid）.展开更多
Ferulic acid was obtained from rice hull with the microwave-assisted extraction method.The solubility data of trans-ferulic acid in 8 binary systems of water and organic solvents,such as methyl acetate,ethyl acetate,b...Ferulic acid was obtained from rice hull with the microwave-assisted extraction method.The solubility data of trans-ferulic acid in 8 binary systems of water and organic solvents,such as methyl acetate,ethyl acetate,butyl acetate,methanol,ethanol,dichloromethane and chloroform were measured from 273.15 K to 333.15 K.The empirical equation was adopted,and the solubilities calculated by the model were in good agreement with experimental data.展开更多
Four new acylhydrazones containing carboxyl,3a3d,were synthesized and their compositions and structures were characterized with elemental analysis, MS,IR and 1H NMR spectra.Their bacterio-（static） activities against...Four new acylhydrazones containing carboxyl,3a3d,were synthesized and their compositions and structures were characterized with elemental analysis, MS,IR and 1H NMR spectra.Their bacterio-（static） activities against staphylocus auteus,escherichia coil and bacillus subtilis were studied by Kirby-Bauer method.展开更多
文摘Nimbya alternantherae is a leaf spot fungus isolated from Alternanthera philoxeroides.It could produce phytotoxin to Alternanthera philoxeroides in several kinds of liquid media,especially in modified Fries.The filtrate of the pathogen was chromatographed on a DM-130 colophony column eluting with methanol,and evaporation of the solvent gave a brown mush.The crude product was then extracted with ethyl acetate.The toxin could be purified as white needles by re-crystallizing from benzene and acetone（volume ratio is 1∶1） and silica gel chromatograph.The results of elemental analysis,MS,IR and NMR indicate that molecular weight of the toxin was 240,formula was C11H12O6,and its chemical name was 2-acetyl-3,4-dihydroxy-5-methoxyphenyl-acetic acid（Vulculic acid）.
文摘Ferulic acid was obtained from rice hull with the microwave-assisted extraction method.The solubility data of trans-ferulic acid in 8 binary systems of water and organic solvents,such as methyl acetate,ethyl acetate,butyl acetate,methanol,ethanol,dichloromethane and chloroform were measured from 273.15 K to 333.15 K.The empirical equation was adopted,and the solubilities calculated by the model were in good agreement with experimental data.
文摘Four new acylhydrazones containing carboxyl,3a3d,were synthesized and their compositions and structures were characterized with elemental analysis, MS,IR and 1H NMR spectra.Their bacterio-（static） activities against staphylocus auteus,escherichia coil and bacillus subtilis were studied by Kirby-Bauer method.
