Qualitative and quantitative analyses of bioactive secolignans from folk medicinal plant Peperomia dindygulensis using UHPLC-UV/Q-TOF-MS.

Peperomia dindygulensis, with secolignans (SLs) as major bioactive constituents, is a commonly used traditional folk medicine in mainland China for treatment of stomach, liver, mammary, and esophageal cancers. However, to date, there is no method available for the qualitative and quantitative analyses of SLs in this medicinal plant. The purpose of this study was to establish a sensitive, selective, and reproducible method for rapidly profiling, identifying, and determining SLs in the whole plant of P. dindygulensis. Ultra high-performance liquid chromatography (UHPLC) coupled with ultraviolet detector (UV) and quadrupole tandem time-of-flight mass spectrometry (Q-TOF-MS) were used for this analyses. The fragmentation behaviors of different types of SLs were described. A total of thirteen SLs, including two new derivatives, were identified or tentatively characterized in P. dindygulensis samples. In addition, seven major SLs in herbal samples from different regions in China were successfully determined. The method developed in this study is suitable for the qualitative and quantitative analyses of SLs in P. dindygulensis, and may be applicable for determining or identifying SLs from other Pepermia genus plants.