Identification and simultaneous quantification of five alkaloids in Piper longum L. by HPLC-ESI-MSn and UFLC-ESI-MS/MS and their application to Piper nigrum L.
Keywords: Piper longum L.; P. nigrum L.; Alkaloids; Quantification; HPLC-ESI-MSn; UFLC-ESI-MS/MS;