and quantified by the external standard method. A 1200 series liquid chromatograph
system, equipped with a quaternary pump, with an electrospray ionization system and coupled to a G6410A triple quadrupole
mass spectrometer detector (all from Agilent technologies, Santa Clara, CA, USA) was used. The plant material (2 g) was
extracted by Ultra-Turrax in 8 þ 4 mL of ethyl acetate/methanol mixture (9:1 by volume) after adding 4 mL of a 20% NaCl aq.