Dear ze eb,

% Inhibition = 100 X [(A-B) - (C-D)]/(A-B)

where A represents absorbance in the presence of ACE, B absorbance of the reaction blank, C absorbance in the presence of ACE and inhibitor, and D absorbance of the sample blank. All determinations were carried out in duplicate.

For more information, please use the following link:

https://www.google.ps/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0ahUKEwiIi56Cn5nMAhUISBQKHS0DByoQIAhSMAc&url=http%3A%2F%2Fwebcache.googleusercontent.com%2Fsearch%3Fq%3Dcache%3A1ctI1keOjQAJ%3Afins.uns.ac.rs%2Fe-journal%2Findex.php%253Fmact%253DMagazines%2Ccntnt01%2Cdetails%2C0%2526cntnt01hierarchyid%253D26%2526cntnt01sortby%253Dmagazine_id%2526cntnt01sortorder%253Dasc%2526cntnt01summarytemplate%253Dcurrent%2526cntnt01detailtemplate%253Ddetaljno%2526cntnt01cd_origpage%253D178%2526cntnt01magazineid%253D121%2526cntnt01returnid%253D188%2B%26cd%3D8%26hl%3Den%26ct%3Dclnk%26gl%3Dps&usg=AFQjCNFZ2s9RWDPuyNJ799yOq_2keBk2pA&sig2=CE4rhiHX4WMEO1nosuAsoA

http://www.tandfonline.com/doi/pdf/10.1271/bbb.56.517

Hoping this will be helpful,

Rafik

thank you very much, Rafik Karaman