Aim A capillary zone electrophoretic method （CZE） was used to determine the interactions between natural products and thrombin. Methods Samples containing natural products and thrombin at various ratios were incubat...Aim A capillary zone electrophoretic method （CZE） was used to determine the interactions between natural products and thrombin. Methods Samples containing natural products and thrombin at various ratios were incubated at 25 ℃ and then were separated by CZE with Tris-acetate buffer at pH 7.2. Each run could be accomplished within 5 min. Results In CZE, the peak width broadened due to the affinity interaction between natural products and thrombin. Compared with positive and negative control, the natural products （CB-1, CB-2） from Coreopsis tinctoria Nuttt. interacted with thrombin; CB-3 from Coreopsis tinctoria Nuttt. and HC-1, HC-2, HC-3 from Cistanche deserticola Ma. did not bind to thrombin. Both qualification and quantification characterizations of the binding were determined. Conclusion The established method is capable of sensitive and fast determination of natural products and thrombin interactions, it can be employed as an alternative method.展开更多
Objective To provide experimental evidence for the antihypertensive activity of the flavonoids in flower buds of Coreopsis tinctoria（CT-F）and to investigate the underlying mechanism.Methods The spontaneously hyperte...Objective To provide experimental evidence for the antihypertensive activity of the flavonoids in flower buds of Coreopsis tinctoria（CT-F）and to investigate the underlying mechanism.Methods The spontaneously hypertensive rats（SHRs）were divided into model,captopril（positive control）,and CT-F groups,and the Wistar-Kyoto rats were set as control group,eight in each group.The blood pressure of SHRs,the activity of angiotensin II（Ang-II）in plasma,nitric oxide（NO）,malondialdehyde（MDA）and thoracic aorta media thickness in SHRs were measured by tail-cuff method,radioimmunity method,nitrate reductase method,thibabituric acid（TBA）method,and the hematoxylin-eosin staining method.Q-PCR analysis was performed to determine the relative quantity of angiotensin-converting enzyme（ACE）,ACEII,angiotensin type 1receptor（AT1R）,and TGF-β1 mRNA in left ventricle.Results CT-F could lower the systolic blood pressure of SHRs dramatically（P〈0.01）.The levels of MDA in serum and Ang II in plasma of SHRs treated with CT-F decreased markedly（P〈0.05,0.01）,the level of NO in serum increased significantly（P〈0.01）.In addition,thoracic aorta media thickness in SHRs treated with CT-F was thinner than that of the model group（P〈0.05）.The mRNA expression of ACE,AT1R,and TGF-β1 in left ventricle was markedly decreased（P〈0.05）,while that of ACE II was increased（P〈0.05）.Conclusion CT-F is effective to lower the blood pressure of SHRs,and its antihypertensive effect is probably associated with lowering the oxidative stress by reducing MDA,ameliorating aorta remodeling,dilating vessel by increasing NO and decreasing Ang-II,and regulating the expression of rennin-angiotensin System-related various genes.展开更多
Objective:Small molecules in snow chrysanthemum such as flavonoids,phenolic compounds and amino acids have been extensively investigated.No study to date has focused on water-soluble oligosaccharides.The objective of ...Objective:Small molecules in snow chrysanthemum such as flavonoids,phenolic compounds and amino acids have been extensively investigated.No study to date has focused on water-soluble oligosaccharides.The objective of this study is identification and determination of water-soluble oligosaccharides in snow chrysanthemum.Methods:The oligosaccharides in snow chrysanthemum were identified by high performance thin layer chromatography(HPTLC),liquid chromatography-mass spectrometry(LC-MS)combined MS library and methylation analysis for the first time.Subsequently the oligosaccharides were determined by high performance liquid chromatography with a charged aerosol detector(HPLC-CAD).Results:The oligosaccharides in snow chrysanthemum were identified as inulin-type fructooligosaccharides(FOS).The yield of FOS(DP3~DP13)in the first extraction was over 97.6%.The RSDs of repeatability in three sample amount levels(0.08 g,0.1 g,0.12 g)are lower than 4.8%and the RSDs of stability are less than 3.5%.The recoveries of FOS(DP3~13)were ranging from 96.9%to 105.6%.The contents of FOS(DP3~DP13)in flowers of snow chrysanthemum from different regions of China were greatly variant.Conclusion:This is the first time to identify and quantify FOS in snow chrysanthemum which is helpful for its performance in the in the fields of biomedical,agriculture and functional food industry as well as development of the quality control methods.In addition,the identification approach developed in this work can also be used for screening potential natural sources containing FOS.展开更多
文摘Aim A capillary zone electrophoretic method （CZE） was used to determine the interactions between natural products and thrombin. Methods Samples containing natural products and thrombin at various ratios were incubated at 25 ℃ and then were separated by CZE with Tris-acetate buffer at pH 7.2. Each run could be accomplished within 5 min. Results In CZE, the peak width broadened due to the affinity interaction between natural products and thrombin. Compared with positive and negative control, the natural products （CB-1, CB-2） from Coreopsis tinctoria Nuttt. interacted with thrombin; CB-3 from Coreopsis tinctoria Nuttt. and HC-1, HC-2, HC-3 from Cistanche deserticola Ma. did not bind to thrombin. Both qualification and quantification characterizations of the binding were determined. Conclusion The established method is capable of sensitive and fast determination of natural products and thrombin interactions, it can be employed as an alternative method.
文摘Objective To provide experimental evidence for the antihypertensive activity of the flavonoids in flower buds of Coreopsis tinctoria（CT-F）and to investigate the underlying mechanism.Methods The spontaneously hypertensive rats（SHRs）were divided into model,captopril（positive control）,and CT-F groups,and the Wistar-Kyoto rats were set as control group,eight in each group.The blood pressure of SHRs,the activity of angiotensin II（Ang-II）in plasma,nitric oxide（NO）,malondialdehyde（MDA）and thoracic aorta media thickness in SHRs were measured by tail-cuff method,radioimmunity method,nitrate reductase method,thibabituric acid（TBA）method,and the hematoxylin-eosin staining method.Q-PCR analysis was performed to determine the relative quantity of angiotensin-converting enzyme（ACE）,ACEII,angiotensin type 1receptor（AT1R）,and TGF-β1 mRNA in left ventricle.Results CT-F could lower the systolic blood pressure of SHRs dramatically（P〈0.01）.The levels of MDA in serum and Ang II in plasma of SHRs treated with CT-F decreased markedly（P〈0.05,0.01）,the level of NO in serum increased significantly（P〈0.01）.In addition,thoracic aorta media thickness in SHRs treated with CT-F was thinner than that of the model group（P〈0.05）.The mRNA expression of ACE,AT1R,and TGF-β1 in left ventricle was markedly decreased（P〈0.05）,while that of ACE II was increased（P〈0.05）.Conclusion CT-F is effective to lower the blood pressure of SHRs,and its antihypertensive effect is probably associated with lowering the oxidative stress by reducing MDA,ameliorating aorta remodeling,dilating vessel by increasing NO and decreasing Ang-II,and regulating the expression of rennin-angiotensin System-related various genes.
基金supported by the National Key Research and Development Project(SQ2018YPC170480,2018YFC1708202)the National Natural Science Foundation of China(81774009)+1 种基金the Key science and technology projects of Inner Mongolia Autonomous Region(2019ZD004)Open Project Program of Inner Mongolia Key Laboratory of Toxicant Monitoring and Toxicology,China(MDK 2019040)。
文摘Objective:Small molecules in snow chrysanthemum such as flavonoids,phenolic compounds and amino acids have been extensively investigated.No study to date has focused on water-soluble oligosaccharides.The objective of this study is identification and determination of water-soluble oligosaccharides in snow chrysanthemum.Methods:The oligosaccharides in snow chrysanthemum were identified by high performance thin layer chromatography(HPTLC),liquid chromatography-mass spectrometry(LC-MS)combined MS library and methylation analysis for the first time.Subsequently the oligosaccharides were determined by high performance liquid chromatography with a charged aerosol detector(HPLC-CAD).Results:The oligosaccharides in snow chrysanthemum were identified as inulin-type fructooligosaccharides(FOS).The yield of FOS(DP3~DP13)in the first extraction was over 97.6%.The RSDs of repeatability in three sample amount levels(0.08 g,0.1 g,0.12 g)are lower than 4.8%and the RSDs of stability are less than 3.5%.The recoveries of FOS(DP3~13)were ranging from 96.9%to 105.6%.The contents of FOS(DP3~DP13)in flowers of snow chrysanthemum from different regions of China were greatly variant.Conclusion:This is the first time to identify and quantify FOS in snow chrysanthemum which is helpful for its performance in the in the fields of biomedical,agriculture and functional food industry as well as development of the quality control methods.In addition,the identification approach developed in this work can also be used for screening potential natural sources containing FOS.
