Effect of mono- and dual frequency power ultrasound assisted enzymolysis on the degree of hydrolysis and ACE inhibitory activity of Stevia protein hydrolysates - Gasmalla, Mohammed Abdalbasit A.; Musa, Abubakr; Awad, Faisal N.; Admassu, Habtamu; Ma, Haile (Tropical journal of pharmaceutical research, 2021)