Effects of different drying conditions on protein in Cordyceps / 中国中药杂志

In this study,the protein in different Cordyceps samples,which include fresh sample( S1),22 ℃ drying sample( S2),37 ℃ drying sample( S3) and 60 ℃ drying sample( S4),were analyzed by sodium dodecylsupinate-polyacrylamide gel electrophoresis( SDS-PAGE) and two-dimensional electrophoresis( 2-DE). The total protein contents in Cordyceps samples were from 1. 655-4. 493 mg·g~(-1) and the protein contents in fresh sample was the highest. The results of SDS-PAGE showed that the mainly ranges of protein molecular weight of Cordyces samples were 10-100 kDa and the numbers of protein bands were 28 to 41,the fresh sample had the maximum number of protein bands. The 2-DE profiles were analyzed by PDQuest software. The resulted indicated that 488-876 protein spots were detected in different Cordyceps samples and the isoelectric point( pI) was distributed between 4. 5 and 6. 5,the protein molecular weight was distributed in 10-20 kDa and 25-100 kDa,the fresh sample had the maximum number of protein spots. Therefore,the drying process could decrease contents and species of protein in Cordyceps,and the different drying conditions had different effects on protein. These results provide a reference for improving the drying process of Cordyceps.

Chemical constituents in Akebiae Fructus based on UFLC-Q-TOF/MS / 中草药

Objective: To identify the chemical constituents in Akebiae Fructus by UFLC-Q-TOF/MS method. Methods: The separation was performed on an Acquity UPLC BEH C18 Column (100 mm × 2.1 mm, 1.7 μm), with a mobile phase using 0.1% formic acid-acetonitrile and water containing 0.1% formic acid (B) for gradient elution. The flow rate was 0.3 mL/min, the temperature of column was 40°C with injection volume of 1 μL. TOF/MS and electrospray ion (ESI) source were applied for the qualitative analysis under the negative ion mode, and the full mass scan range was m/z 100-1500. Results: According to MS principle, twenty-five triterpenoids were identified from the methanol extract of Akebiae Fructus and the chemical structures of other nine unknown compounds were deduced. Conclusion: UFLC-Q-TOF/MS method could identify the main chemical constituents in Akebiae Fructus rapidly and accurately, which lays a foundation for the quality control of Akebiae Fructus.