A new tetrastilbene named carasinol D （1） was isolated from the roots of Caragana sinica. Its structure was elucidated by spectroscopic analysis. Compound 1 was obtained from carasinol B （2） by an acid-catalyzed c...A new tetrastilbene named carasinol D （1） was isolated from the roots of Caragana sinica. Its structure was elucidated by spectroscopic analysis. Compound 1 was obtained from carasinol B （2） by an acid-catalyzed conversion.展开更多
In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were c...In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon.展开更多
The roots of Caragana sinica (Buc′hoz) Rehd is a Chinese folk medicine used for the treatment of asthenia syndrome, vascular hypertension, leukorrhagia, arthrodynia, and as antiinflammatory agent From the ethanolic...The roots of Caragana sinica (Buc′hoz) Rehd is a Chinese folk medicine used for the treatment of asthenia syndrome, vascular hypertension, leukorrhagia, arthrodynia, and as antiinflammatory agent From the ethanolic extract of the roots of C sinica, five isoflavonoid compounds were isolated and identified as flemichapparin B, formononetin, pseudobaptigenin, 5 hydroxy 7,4 ′ dimethoxy isoflavone and 5 hydroxy 7 methoxy 3 ′,4 ′ methylenedioxy isoflavone展开更多
Three stilbene tetramers, carasinols AC (13), along with three known substances, leachianol C, cararosinol A and stenophyllol B, were isolated from the roots of Caragana sinica. Their structures were elucidated by spe...Three stilbene tetramers, carasinols AC (13), along with three known substances, leachianol C, cararosinol A and stenophyllol B, were isolated from the roots of Caragana sinica. Their structures were elucidated by spec-troscopy. It was found that compounds isolated except for stenophyllol B stimulated the proliferation of cultured osteoblasts.展开更多
基金This project is supported by the National Natural Science Foundation of China （No. 39270800）；the Major Subject of the Science and Technology Commission of Shanghai Municipality （No. 06DZ19709）.
文摘A new tetrastilbene named carasinol D （1） was isolated from the roots of Caragana sinica. Its structure was elucidated by spectroscopic analysis. Compound 1 was obtained from carasinol B （2） by an acid-catalyzed conversion.
基金Major State Basic Research Projects of China(973-2010CB732204)Specific Programs in Graduate Science and Technology Innovation of Beijing Forestry University(BLYJ201110)
文摘In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon.
文摘The roots of Caragana sinica (Buc′hoz) Rehd is a Chinese folk medicine used for the treatment of asthenia syndrome, vascular hypertension, leukorrhagia, arthrodynia, and as antiinflammatory agent From the ethanolic extract of the roots of C sinica, five isoflavonoid compounds were isolated and identified as flemichapparin B, formononetin, pseudobaptigenin, 5 hydroxy 7,4 ′ dimethoxy isoflavone and 5 hydroxy 7 methoxy 3 ′,4 ′ methylenedioxy isoflavone
基金Project supported by the National Natural Science Foundation of China (No. 39270800).
文摘Three stilbene tetramers, carasinols AC (13), along with three known substances, leachianol C, cararosinol A and stenophyllol B, were isolated from the roots of Caragana sinica. Their structures were elucidated by spec-troscopy. It was found that compounds isolated except for stenophyllol B stimulated the proliferation of cultured osteoblasts.
