Your browser doesn't support javascript.
Show: 20 | 50 | 100
Results 1 - 6 de 6
Add filters

Year range
Article in Chinese | WPRIM | ID: wpr-873256


Objective::To study on the content change and transformation rule of eight main characteristic components in stir-frying process of Glycyrrhizae Radix et Rhizoma. Method::The contents of liquiritin apioside, liquiritin, isoliquiritin apioside, isoliquiritin, liquiritigenin, isoliquiritigenin, glycyrrhizic acid and glycyrrhetinic acid in Glycyrrhizae Radix et Rhizoma were determined simultaneously by HPLC. The chromatographic conditions were Waters Symmetry® C18 column (4.6 mm×250 mm, 5 μm), and the mobile phase of acetonitrile (A)-0.05%phosphoric acid solution (B) for gradient elution (0-9 min, 19%-25%A; 9-18 min, 25%-34%A; 18-38 min, 34%-51%A; 38-58 min, 51%-89%A), the flow rate of 1 mL·min-1, the detection wavelengths at 320 nm (0-16 min), 276 nm (16-25 min), 370 nm (25-28 min), 254 nm (28-58 min), the injection volume of 10 μL and the column temperature at 30 ℃. Result::After stir-frying, the total content of three components with dihydroflavone as mother nucleus was decreased, while the total content of three components with chalcone as mother nucleus showed an upward trend, the content change of glycyrrhizic acid was not obvious, but glycyrrhetinic acid content showed a slight upward trend. When the monomer heating temperature reached 130 ℃, dihydroflavones and chalcones could be isomerized with each other, and with the increase of temperature, the isomerization became more obvious. When the heating temperature rose to 180 ℃ (isoliquiritin apioside was 130 ℃), in addition to the isomerization, the glucosidic bond of flavonoid glycosides began to break and gradually transformed into the corresponding secondary glycosides or aglycones. Glucosidic bond of glycyrrhizic acid could also be broken to form glycyrrhetinic acid, which was detected at 150 ℃. Conclusion::The change of chemical composition is complex during stir-frying process of Glycyrrhizae Radix et Rhizoma, in addition to the isomerization and glucosidic bonds breaking observed in this experiment, there may be other complex reactions. The content of one compound in the herb is affected by many factors during its processing, such as the time and temperature of frying, the stability of the compound itself and so on.

Article in Chinese | WPRIM | ID: wpr-802175


Objective:HPLC for the determination of five components in Descurainiae Semen was established to investigate the change rule of contents of five components in the herb before and after being processed. Method:The contents of quercetin-3-O-β-D-glucose-7-O-β-D-gentiobioside(QGG),sinapic acid,quercetin-3-O-β-D-glucopyranoside(QG),isorhamnetin-3-O-β-D-glucopyranoside(IG) and 1,2-di-O-sinapoyl-β-D-glucopyranose(SG) was determined simultaneously by HPLC,the change rule of contents of these components before and after processing and its reasons were analyzed.Waters Symmetry® C18 column(4.6 mm×250 mm,5 μm) was employed,and the mobile phase was acetonitrile(A)-1% acetic acid aqueous solution(B) for gradient elution(0-5 min,5%-10%A;5-15 min,10%-13%A;15-23 min,13%-20%A;23-43 min,20%-25%A;43-46 min,25%A;46-55 min,25%-40%A;55-60 min,40%A).The flow rate was 1 mL·min-1.The detection wavelength was set at 265 nm,the injection volume was 10 μL,and the column temperature was 30℃. Result:Contents of the above five components before processing were 0.114 3%,0.041 6%,0.036 2%,0.022 6% and 0.097 6%;after processing,the contents of these five components turn into 0.107 4%,0.011 3%,0.034 2%,0.021 9% and 0.058 9%;among them,the contents of these five components decreased by 6.04%,72.84%,5.52%,3.10% and 39.65%,respectively. Conclusion:The contents of these five components in Descurainiae Semen is reduced to varying degrees after processing.The contents of phenylpropanoids decrease significantly,while the contents of flavonoid glycosides do not change significantly.

Article in Chinese | WPRIM | ID: wpr-801717


Objective: To analysis and identify the chemical components in Trichosanthis Fructus by UPLC-LTQ-Orbitrap-MS. Method: Samples of Trichosanthis Fructus were extracted by ultrasonic with 70% methanol after smashing and sifting by 40 mesh sieve. Thermo ScientificTM DionexTM UltiMateTM 3000 Rapid Separation LC system performed UPLC separations with Waters HSS T3-C18(2.1 mm×100 mm,1.8 μm) column. The mobile phase was 0.1% formic acid water(A)-methanol(B) with a gradient elution. The volume flow was 0.3 mL ·min-1. A Thermo ScientificTM LTQ-Orbitrap mass spectrometer equipped with a ESI probe was employed. The samples were respectively scanned in MS1 and MS2 mode of positive and negative ions. According to the chromatographic peak separation,mass signal intensity,and the number of molecular ions in MS1 model,the extraction condition,chromatogram and mass spectrum parameters were optimized. The chemical compounds were identified by the accurate mass measurement of molecular ions and fragment ion and comparation with reference substance. Result: 91 chemical compositions in Trichosanthis Fructus were totally identified,including 14 amino acids,5 monoterpenoids,5 tetracyclic triterpenoids,1 pentacyclic triterpene,14 flavonoids, 17 organic acids,3 polysaccharides,7 nucleotides,7 alkaloids and nitrogen compounds,2 volatile components,1 phytosterol,5 other compositions. Conclusion: The established UPLC-LTQ-Orbitrap-MS method can be used to quickly analyze and identify the main chemical constituents of Trichosanthis Fructus. The chemical information concerning the constituents in Trichosanthis Fructus could be helpful to the quality control and further studies of Trichosanthis Fructus.

Article in Chinese | WPRIM | ID: wpr-801715


Objective: Taking electronic-eye (visual analyzer) technique,based on the powder color of Andrographis Herba,to investigate the applicability of electronic-eye technique and evaluate the quality of Andrographis Herba with different commercial specifications. Method: HPLC was employed to determine contents of andrographolide,dehydroandrographolide,14-deoxyandrographolide,neoandrographolide in 50 batches of Andrographis Herba with different commercial specifications(stems,leaves and aerial parts).Color of these samples were measured by electronic-eye technique.The data were analyzed by principal component analysis(PCA) and Pearson correlation analysis.The ability of electronic-eye to distinguish the different commercial specifications of Andrographis Herba was investigated and the correlation of chroma space system parameters (L*,a*,b*) with active components was investigated. Result: There was remarkable difference in contents of 4 diterpenoids in Andrographis Herba from different parts,their contents in leaves was the highest,followed by the aerial parts(mixture of stems and leaves),and their contents in stems was the lowest.The results of PCA was divided into two classes,namely the stem part,leaf and aerial parts,indicating that electronic-eye could be used to distinguish the quality of Andrographis Herba.The correlation results showed that there were significant negative correlation(PL*(lightness value) and the contents of andrographolide,dehydroandrographolide,14-deoxyandrographolide,neoandrographolide and the total content of these 4 components.In addition,L* of samples that did not conform to the lower limit of determination in the 2015 edition of Chinese Pharmacopeia was ≥ 69.5,and the L* of more than 90% of the samples in accordance with the requirements was Conclusion: Electronic-eye technique provides a new method and idea for the quality evaluation of Andrographis Herba.

Article in Chinese | WPRIM | ID: wpr-690404


References and our previous experiment showed that the contents of glycosides were significantly decreased,while the contents of aglycones were significantly increased after processing of Cassiae Semen.It may be related to its glycosidases or the heating process. In order to investigate the reasons, high performance liquid chromatographic (HPLC) was used to study the effects of these two factors on contents of Cassiae Semen's main chemical components in processing. The results showed that glycoside hydrolases was present in Cassiae Semen and could rapidly hydrolyze glycosides from Cassiae Semen into aglycones in suitable temperature with sufficient water.However,it didn't show effect on contents change of main constituents in the procedure of Cassiae Semen processing.The reason for content decrease of glycosides and content increase of aglycones in processed Cassiae Semen was glycoside bond cracking to produce corresponding aglycone at high temperature.This study further provides basis for further revealing of the processing mechanism of Cassiae Semen.

Article in Chinese | WPRIM | ID: wpr-687276


A new flavonoid glycoside, named complanatoside C (1), and 19 known compounds (2-20) were isolated from an 95% ethanol extract of Astragali Semen by various chromatographic methods. Their structures were identified on the basis of UV, IR, NMR, MS spectroscopic data analysis, and comparison with those in literature, including fifteen flavonoid glycoside (1-15), and six other constituents (16-20), among which compounds 16-19 were isolated from this plant for the first time.