Angiotensin converting enzyme inhibitors from ripened and unripened bananas

Ripened and unripened nendran, rasthali, poovan, robusta, bontha and safed velchi bananas were investigated for inhibition against angiotensin convert ing enzyme (ACE) using Hip-His-Leu as substrate. The inhibition of ACE by d ifferent ripened banana cultivars was much more than that of unripened bana na cultivars, The ACE inhibitory activity of ripened and unripened poovan w as heat stable and stable to extreme acidic pH and alkaline pH, The ACE inh ibitory activity of ripened and unripened banana cultivars was reduced to 2 5% and 33% respectively on dialysis.