ABSTRACT
OBJECTIVE To determine simultaneously four lactones ingredients content in Yinxingye tablets by quantitative analysis of multi-components by single-marker (QAMS), and to verify the application value of this method in the quality control of Yinxingye tablets. METHODS With Ginkgo esters as the indexes,the relative correction factor(RCFs) between bilobalide and ginkgolides A,B,C were established. The content of bilobalide in Yinxingye tablets were determined by external standard method,the content of ginkgolides A,B,C in Yinxingye tablets was calculated by the relative correction factor. The external standard method and QAMS determined contents of 4 lactones, Rationality, feasibility and repeatability of the QAMS method were verified by comparing the results obtained from two different methods. RESULTS There was no significant differences between the calculated value and estimated value on QAMS and external standard method of the 5 batches of Yinxingye tablets,the results showed that the RCF was authentic. CONCLUSION The established correction factor is good repeatability,and could be used for quantitative analysis and quality evaluation of multiple components in Yinxingye tablets.
ABSTRACT
Objective To explore the feasibility of using the quantitative reference extract of ginkgo leaf total lactones instead of single component reference for the quantitative assay of Ginkgo Folium.Methods HPLC-ELSD method was performed by using a Diamonsil C18 column (250 mm×4.6 mm,5 μm) with methanol-water as the mobile phase at the gradient elution mode.Flow rate was 1.0 mL·min-1.The parameters of ELSD detector were as follows,the drifit tube temperature was 105 ℃,and the flow rate of nitrogen(N2) was 3 L·min-1.Results The linear ranges of ginkgolide A,ginkgolide B,ginkgolide C,and bilobalide were 0.735-5.879 μg (r=0.999 6),0.404-6.060 μg (r=0.999 6),0.296-4.439 μg (r=0.999 6),and 1.001-6.006 μg (r=0.999 7),respectively.The recoveries and RSD of the four components were 95.6% (4.0%),97.3% (4.5%),99.3% (5.0%),and 100.4% (2.1%),respectively.Conclusion The quantitative reference extract of ginkgo leaf total lactones can be used as the substitute for the determination of terpene lactones.
ABSTRACT
Objective To prepare the phmaceutical reference materials of total lactones extract from ginkgo leaf for quantitative analysis.Methods A HPLC determination method was developed to investigate the uniformity and stability of the reference extract of ginkgo leaf total lactones using with bilobalide, ginkgolide A, ginkgolide B and ginkgolide C as the indexes.Three laboratories participated in the collaborative calibration test.Results The four components in reference extract had good uniformity and stability with RSD less than 2.0%;the marked values of the four components had been determined through statistical data analysis which provided by assigned traceability values.The values of bilobalide, ginkgolide A, ginkgolide B, and ginkgolide C were 39.54%, 29.03%, 15.96% and 11.69%, respectively.Conclusion The reference extract of ginkgo leaf total lactones can be prepared for quality control in future quantitative analysis.
ABSTRACT
This study was aimed to explore the suppression of nitric oxide (NO) production in RAW264.7 cells by total lactones fraction from Andrographis paniculata. The inflammatory model in vitro was established by stimulating the RAW264.7 cells with lipopolysaccharide (LPS). The NO production and inhibitory rate were determined by Griess assay. Cytotoxicity was evaluated by MTT method. The results showed that total lactones fraction ofA. paniculata suppressed NO production in a concentration-dependent manner in the concentration range from 5 to 50μmol·L-1 and their IC50 values were 8.58μmol·L-1, 11.52μmol·L-1 and 8.94μmol·L-1, respectively. In this condition, major constituents were andrographolide (5-60μmol·L-1), dehydroandrographolide (5-100μmol·L-1) and neoandrographolide (5-100μmol·L-1) inhibited NO production in a dose-dependent manner with an IC50 values of 17.54μmol·L-1, 49.54μmol·L-1 and 41.80μmol·L-1, respectively. It was concluded that the NO inhibitory activity of total lactones fromA. paniculata was better than three active ingredients, which may be able to provide a theoretical foundation and scientific basis for the preparation and clinical application of total lactones fraction fromA. paniculata.