Negative pressure cavitation based ultrasound-assisted extraction of main flavonoids from Flos Sophorae Immaturus and evaluation of its extraction kinetics

•An efficient method of NPC-UAE was firstly applied to extract flavonoids from FSI.•The process of NPC-UAE of flavonoids in FSI was firstly explored through kinetics.•The mass transfer mechanism of NPC-UAE was described in detail in this paper.•The excellent performance of NPC-UAE was superior to the traditional methods.•The application prospect of efficient NPC-UAE in industrial field is great.