The core of the natural product chemistry laboratory is isolation secondary metabolit</span><span style="font-family:Verdana;">e</span><span style="font-family:""><s...The core of the natural product chemistry laboratory is isolation secondary metabolit</span><span style="font-family:Verdana;">e</span><span style="font-family:""><span style="font-family:Verdana;">s. One of the potential secondary metabolites for isolation in the natural product chemistry laboratory is routine (quercetin-3-O-glycosides). Routine (Quercetin-3-O-glycoside) has been isolated from ethanol extract of rubber cassava leaves (</span><i><span style="font-family:Verdana;">Manihot glaziovii </span></i><span style="font-family:Verdana;">MA). Isolation was done by maceration and recrystallization. The isolation method used in this study is complemented by the isolation method published. The isolated (Quercetin-3-O-glycoside) routine using this method obtained a yield of 0.118% of the total dried leaf extract. The routine (Quercetin-3-O-glycoside) was identified using a standard routine. Routine can be further utilized in the world of medicine as an amplifier of capillary structure, reducing the permeability and fragility of blood vessels.展开更多
Ultraperformance liquid chromatography/quadrupole-time-of-flight mass spectrometry(UPLC-Q-TOF/MS) and the MetabolynxTM software, combined with mass defect filtering, were applied to identity the metabolites of quercet...Ultraperformance liquid chromatography/quadrupole-time-of-flight mass spectrometry(UPLC-Q-TOF/MS) and the MetabolynxTM software, combined with mass defect filtering, were applied to identity the metabolites of quercetin-3-O-β-D-glucopyranosyl-(4→1)-α-L-rhamnoside(QGR) in rats after intravenous administration. MSE was used for simultaneous acquisition of precursor ion information and fragment ion data at high and low collision energy in one analytical run, which facilitated the rapid structural characterization of eight metabolites in rat plasma, urine and bile. The results indicated that methylation and glucuronidation were the major metabolic pathways of QGR in vivo. The present study provided important information about the metabolism of QGR which will be useful for fully understanding the mechanism of action of this compound. Furthermore, this work demonstrated the potential of the UPLC-Q-TOF/MS approach using Metabolynx for rapid and automated research of the metabolites of natural products.展开更多
Objective: Quercetin-3-O-β-D-glucuronide(QG) can alleviate immunological bone marrow failure(BMF) by increasing platelet counts. However, the principal mechanism is less known. This study aimed at deciphering the pos...Objective: Quercetin-3-O-β-D-glucuronide(QG) can alleviate immunological bone marrow failure(BMF) by increasing platelet counts. However, the principal mechanism is less known. This study aimed at deciphering the possible underlying mechanism of QG that is indicated in thrombocytopenic purpura. Methods: In vitro and in vivo experiments were carried out for investigating the mechanism behind QG-facilitated inhibition of mitochondrial pathway-mediated excessive apoptosis of platelets through the phosphatidylinositol-3-kinase(PI3K)/AKT pathway. Results: Our results revealed that QG, the main effective ingredient of Herba Sarcandrae, increases the number of platelets and decreases the expression of Bax, Bad, Bid, and caspase-9 in immunological BMF, indicating the inhibition of mitochondrial pathway-mediated apoptosis. Moreover, we found that the protein and m RNA expressions, as well as the phosphorylated levels of PI3K and AKT, were increased significantly by QG, suggesting the activation of the PI3K/AKT pathway. Furthermore, the inhibition of the PI3K/AKT pathway by LY294002 antagonizes the effects of QG on platelet counts and mitochondrial pathway-mediated apoptosis. Conclusion: We demonstrate that QG inhibits the mitochondria pathway-mediated platelet apoptosis via the PI3K/AKT pathway in immunological BMF. This study thus sheds light on exploring the possible regulatory mechanism of traditional Chinese medicine in the treatment of thrombocytopenia induced by BMF.展开更多
Quercetin-3-O-sambubioside[Quercetin-3-O-β-D-xylopyranosyl(1→2)-β-D-glucopyranoside]was separated and purified by semi-preparative high-speed counter-current chromatography(HSCCC)with a twophase-solvent system comp...Quercetin-3-O-sambubioside[Quercetin-3-O-β-D-xylopyranosyl(1→2)-β-D-glucopyranoside]was separated and purified by semi-preparative high-speed counter-current chromatography(HSCCC)with a twophase-solvent system composed of ethyl acetate-nbutanol-water(4∶1∶5,v/v)from the leaves of Nelumbo nucifera(Lotus).A total of 5.0 mg of the targeted compound with a purity of 98.6%as determined by high performance liquid chromatography(HPLC)was obtained from 100 mg of the crude extract cleaned up by AB-8 macroporous resin in a one-step separation.Quercetin-3-O-sambubioside was a novel flavonoid glycoside from the leaves of Nelumbo nucifera,and its chemical structure was identified by means of ESI-MS,1D NMR and 2D NMR.展开更多
目的 :研究南葶苈子中槲皮素 3 O β D 葡萄糖 7 O β D 龙胆双糖苷的含量测定方法 ,建立南葶苈子药材质量标准。方法 :采用反相高效液相色谱法 ,以自制标准品作对照 ,对南葶苈子药材中主要有效成分槲皮素 3 O β D 葡萄糖 7 O β D...目的 :研究南葶苈子中槲皮素 3 O β D 葡萄糖 7 O β D 龙胆双糖苷的含量测定方法 ,建立南葶苈子药材质量标准。方法 :采用反相高效液相色谱法 ,以自制标准品作对照 ,对南葶苈子药材中主要有效成分槲皮素 3 O β D 葡萄糖 7 O β D 龙胆双糖苷进行了含量测定。 结果 :回收率为 99.78% ,RSD为 2 .4 %。结论 :该方法可用于南葶苈子药材的质量控制。展开更多
文摘The core of the natural product chemistry laboratory is isolation secondary metabolit</span><span style="font-family:Verdana;">e</span><span style="font-family:""><span style="font-family:Verdana;">s. One of the potential secondary metabolites for isolation in the natural product chemistry laboratory is routine (quercetin-3-O-glycosides). Routine (Quercetin-3-O-glycoside) has been isolated from ethanol extract of rubber cassava leaves (</span><i><span style="font-family:Verdana;">Manihot glaziovii </span></i><span style="font-family:Verdana;">MA). Isolation was done by maceration and recrystallization. The isolation method used in this study is complemented by the isolation method published. The isolated (Quercetin-3-O-glycoside) routine using this method obtained a yield of 0.118% of the total dried leaf extract. The routine (Quercetin-3-O-glycoside) was identified using a standard routine. Routine can be further utilized in the world of medicine as an amplifier of capillary structure, reducing the permeability and fragility of blood vessels.
基金supported by the National Science and Technology Support Program of China(No.2011 BAI04B03)
文摘Ultraperformance liquid chromatography/quadrupole-time-of-flight mass spectrometry(UPLC-Q-TOF/MS) and the MetabolynxTM software, combined with mass defect filtering, were applied to identity the metabolites of quercetin-3-O-β-D-glucopyranosyl-(4→1)-α-L-rhamnoside(QGR) in rats after intravenous administration. MSE was used for simultaneous acquisition of precursor ion information and fragment ion data at high and low collision energy in one analytical run, which facilitated the rapid structural characterization of eight metabolites in rat plasma, urine and bile. The results indicated that methylation and glucuronidation were the major metabolic pathways of QGR in vivo. The present study provided important information about the metabolism of QGR which will be useful for fully understanding the mechanism of action of this compound. Furthermore, this work demonstrated the potential of the UPLC-Q-TOF/MS approach using Metabolynx for rapid and automated research of the metabolites of natural products.
基金supported by the research project of health sciences of Shanghai Jing’an District (2019MS02)Shanghai Bao’shan science and technology commission (18-E-10)+1 种基金the research project of Shanghai municipal commission of health and family planning (201640144,20184Y0094)Shanghai science and technology commission (18401903800)。
文摘Objective: Quercetin-3-O-β-D-glucuronide(QG) can alleviate immunological bone marrow failure(BMF) by increasing platelet counts. However, the principal mechanism is less known. This study aimed at deciphering the possible underlying mechanism of QG that is indicated in thrombocytopenic purpura. Methods: In vitro and in vivo experiments were carried out for investigating the mechanism behind QG-facilitated inhibition of mitochondrial pathway-mediated excessive apoptosis of platelets through the phosphatidylinositol-3-kinase(PI3K)/AKT pathway. Results: Our results revealed that QG, the main effective ingredient of Herba Sarcandrae, increases the number of platelets and decreases the expression of Bax, Bad, Bid, and caspase-9 in immunological BMF, indicating the inhibition of mitochondrial pathway-mediated apoptosis. Moreover, we found that the protein and m RNA expressions, as well as the phosphorylated levels of PI3K and AKT, were increased significantly by QG, suggesting the activation of the PI3K/AKT pathway. Furthermore, the inhibition of the PI3K/AKT pathway by LY294002 antagonizes the effects of QG on platelet counts and mitochondrial pathway-mediated apoptosis. Conclusion: We demonstrate that QG inhibits the mitochondria pathway-mediated platelet apoptosis via the PI3K/AKT pathway in immunological BMF. This study thus sheds light on exploring the possible regulatory mechanism of traditional Chinese medicine in the treatment of thrombocytopenia induced by BMF.
基金funded by the Natural Science Foundation of Jiangxi Province(2006GY0066)the Research Project of Education Office of Jiangxi Province(20030058)the Program for Yangtse Scholars and Innovative Research Team in University(IRT0540).
文摘Quercetin-3-O-sambubioside[Quercetin-3-O-β-D-xylopyranosyl(1→2)-β-D-glucopyranoside]was separated and purified by semi-preparative high-speed counter-current chromatography(HSCCC)with a twophase-solvent system composed of ethyl acetate-nbutanol-water(4∶1∶5,v/v)from the leaves of Nelumbo nucifera(Lotus).A total of 5.0 mg of the targeted compound with a purity of 98.6%as determined by high performance liquid chromatography(HPLC)was obtained from 100 mg of the crude extract cleaned up by AB-8 macroporous resin in a one-step separation.Quercetin-3-O-sambubioside was a novel flavonoid glycoside from the leaves of Nelumbo nucifera,and its chemical structure was identified by means of ESI-MS,1D NMR and 2D NMR.
文摘目的 :研究南葶苈子中槲皮素 3 O β D 葡萄糖 7 O β D 龙胆双糖苷的含量测定方法 ,建立南葶苈子药材质量标准。方法 :采用反相高效液相色谱法 ,以自制标准品作对照 ,对南葶苈子药材中主要有效成分槲皮素 3 O β D 葡萄糖 7 O β D 龙胆双糖苷进行了含量测定。 结果 :回收率为 99.78% ,RSD为 2 .4 %。结论 :该方法可用于南葶苈子药材的质量控制。
