目的:研究姜皮的化学成分。方法:利用MCI Gel CHP-20、Sephadex LH-20、硅胶、ODS、半制备高效液相等色谱技术对姜皮中的化学成分进行分离纯化,结合理化性质和波谱数据鉴定其结构。结果:从姜皮中分离得到9个化合物,分别鉴定为:松脂醇-4...目的:研究姜皮的化学成分。方法:利用MCI Gel CHP-20、Sephadex LH-20、硅胶、ODS、半制备高效液相等色谱技术对姜皮中的化学成分进行分离纯化,结合理化性质和波谱数据鉴定其结构。结果:从姜皮中分离得到9个化合物,分别鉴定为:松脂醇-4-O-α-L-鼠李糖-(1→2)-β-D-葡萄糖苷(1)、2-methoxyphenyl-4-propylene-1-O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside(2)、脱氢枞酸(3)、(E)-2-methoxy-4-(prop-1-en-1-yl)phenyl-β-D-glucopyranoside(4)、tecomin(5)、(2S)-4-(4-hydroxy-3-methoxyphenyl)but-2-yl-β-D-glucopyranoside(6)、淫羊藿苷B(7)、丁香脂素-4′-O-β-D-葡萄糖苷(8)、3,4,5-三甲氧基苯甲酰基-O-β-D-葡萄糖苷(9)。结论:其中,化合物1、2、4~9为首次从姜科植物中分离得到。展开更多
运用MCI Gel CHP-20、Sephadex LH-20、ODS、半制备高效液相等色谱技术,从姜皮正丁醇部位中分离得到3个二苯庚烷类化合物,通过MS和NMR波谱学技术鉴定其结构为:(2S,2'S,3R,3'R,4R,4'R,6R,6'R)-6,6'-bis((S)-1-hydrox...运用MCI Gel CHP-20、Sephadex LH-20、ODS、半制备高效液相等色谱技术,从姜皮正丁醇部位中分离得到3个二苯庚烷类化合物,通过MS和NMR波谱学技术鉴定其结构为:(2S,2'S,3R,3'R,4R,4'R,6R,6'R)-6,6'-bis((S)-1-hydroxy-2-(4-hydroxyphenyl)ethyl)-2,2'-bis(4-hydroxy-3-methoxyphenyl)octahydro-2H,2'H-[3,3'-bipyran]-4,4'-diol(1)、(E)-7-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)hept-4-en-3-one(2)和alpinin B(3),化合物1为新化合物,化合物2、3为首次从姜皮中分离得到。展开更多
Overabundance of phosphorus (P) in soils and water is of great concern and has received much attention in Florida, USA. Therefore, it is essential to analyze and predict the distribution of P in soils across large are...Overabundance of phosphorus (P) in soils and water is of great concern and has received much attention in Florida, USA. Therefore, it is essential to analyze and predict the distribution of P in soils across large areas. This study was undertaken to model the variation of soil total phosphorus (TP) in Florida. A total of 448 soil samples were collected from different soil types. Soil samples were analyzed by chemical reference method and scanned in the visible/near-infrared (VNIR) region of 350-2 500 nm. Partial least squares regression (PLSR) calibration model was developed between chemical reference values and VNIR values. The coefficient of determination (R2) and the root mean squares error (RMSE) of calibration and validation sets, and the residual prediction deviation (RPD) were used to evaluate the models. The R2in calibration and validation for log-transformed TP (log TP) were 0.69 and 0.65, respectively, indicating that VNIR calibration obtained in this study accounted for at least 65% of the variance in log TP using only VNIR spectra, and the high RPD of 2.82 obtained suggested that the spectral model derived in this study was suitable and robust to predict TP in a wide range of soil types, being representative of Florida soil conditions.展开更多
文摘目的:研究姜皮的化学成分。方法:利用MCI Gel CHP-20、Sephadex LH-20、硅胶、ODS、半制备高效液相等色谱技术对姜皮中的化学成分进行分离纯化,结合理化性质和波谱数据鉴定其结构。结果:从姜皮中分离得到9个化合物,分别鉴定为:松脂醇-4-O-α-L-鼠李糖-(1→2)-β-D-葡萄糖苷(1)、2-methoxyphenyl-4-propylene-1-O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside(2)、脱氢枞酸(3)、(E)-2-methoxy-4-(prop-1-en-1-yl)phenyl-β-D-glucopyranoside(4)、tecomin(5)、(2S)-4-(4-hydroxy-3-methoxyphenyl)but-2-yl-β-D-glucopyranoside(6)、淫羊藿苷B(7)、丁香脂素-4′-O-β-D-葡萄糖苷(8)、3,4,5-三甲氧基苯甲酰基-O-β-D-葡萄糖苷(9)。结论:其中,化合物1、2、4~9为首次从姜科植物中分离得到。
文摘运用MCI Gel CHP-20、Sephadex LH-20、ODS、半制备高效液相等色谱技术,从姜皮正丁醇部位中分离得到3个二苯庚烷类化合物,通过MS和NMR波谱学技术鉴定其结构为:(2S,2'S,3R,3'R,4R,4'R,6R,6'R)-6,6'-bis((S)-1-hydroxy-2-(4-hydroxyphenyl)ethyl)-2,2'-bis(4-hydroxy-3-methoxyphenyl)octahydro-2H,2'H-[3,3'-bipyran]-4,4'-diol(1)、(E)-7-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)hept-4-en-3-one(2)和alpinin B(3),化合物1为新化合物,化合物2、3为首次从姜皮中分离得到。
基金Supported by the National Natural Science Foundation of China (No. 41071159)the Cooperative Ecosystem Studies UnitNational Resources Conservation Service (NRCS), USA
文摘Overabundance of phosphorus (P) in soils and water is of great concern and has received much attention in Florida, USA. Therefore, it is essential to analyze and predict the distribution of P in soils across large areas. This study was undertaken to model the variation of soil total phosphorus (TP) in Florida. A total of 448 soil samples were collected from different soil types. Soil samples were analyzed by chemical reference method and scanned in the visible/near-infrared (VNIR) region of 350-2 500 nm. Partial least squares regression (PLSR) calibration model was developed between chemical reference values and VNIR values. The coefficient of determination (R2) and the root mean squares error (RMSE) of calibration and validation sets, and the residual prediction deviation (RPD) were used to evaluate the models. The R2in calibration and validation for log-transformed TP (log TP) were 0.69 and 0.65, respectively, indicating that VNIR calibration obtained in this study accounted for at least 65% of the variance in log TP using only VNIR spectra, and the high RPD of 2.82 obtained suggested that the spectral model derived in this study was suitable and robust to predict TP in a wide range of soil types, being representative of Florida soil conditions.
