ABSTRACT
AIM To establish a UFLC-QTRAP-MS/MS method for the simultaneous content determination of phenylalanine,isoleucine,methionine,valine,proline,tyrosine,aspartic acid,histidine,arginine,lysine and glutamic acid in Gynostemma pentaphyllum (Thunb.) Makino.METHODS The analysis of aqueous extract of G.pentaphyllum was performed on a Waters XBridge Amide column (2.1 mm × 100 mm,3.5 μm),with the mobile phase comprising of water-acetonitrile (containing 0.2％ formic acid) flowing at 0.6 mL/min in a gradient elution manner.RESULTS Eleven amino acids showed good linear relationships within their own ranges (r ＞0.998 9),whose average recoveries were 90.74％-103.05％ with the RSDs of 0.61％-5.00％.CONCLU-SION This accurate,stable and reproducible method can be used for the quality control of G.pentaphyllum.
ABSTRACT
A comprehensive analytical method based on UFLC-QTRAP-MS-MS was developed for the simultaneous determination of 15 kinds of amino acids and 12 kinds of nucleosides of three species in Termitomyces. The separation was carried out on a Waters XBridge Amide column (2.1 mm×100 mm,3.5 μm) with gradient elution of mobile phase of 0.2% formic acid in water-0.2% formic acid in acetonitrile at a flow rate of 0.6 mL•min⁻¹, and column temperature was maintained at 30 ℃. The target compounds were analyzed by the positive ion multiple reaction monitoring (MRM) mode. The principal component analysis(PCA) was made to standardized treatment for the comprehensive evaluation of different species in Termitomyces. The 15 kinds of amino acids and 12 kinds of nucleosides multiple constituents showed good linearity (r>0.997 3) in the range of the tested concentration.The average recoveries ranged from 95.14% to 105.0%,and the relative standard deviations were less than 5.0%. The comprehensive evaluation index obtained with PCA showed that the Termitomyces albuminosus was significantly higher than others in amino acids and in nucleosides, of which the T. aurantiacus was the best. The developed method with good repeatability and accuracy was suitable for the simultaneous determination of multiple functional substances,which provided a new basis for the comprehensive assessment and overall control of the quality of Termitomyces fungi.