The coefficients calculated indicate a fairly or very strong positive correlation between total polyphenol oxidase activity and monophenolase and diphenolase activity (r ¼ 0.89 tor ¼ 0.97). When the activity of total polyphenol oxidase,monophenolase and diphenolase was compared with colour (L* parameter and assessment using a five-point scale), only in the case of colour evaluation by the five-point scale was there amoderate negative correlation (r¼0.42 to r¼0.56); in the remaining cases, any correlation was weak or very weak.