Distribution of Enzymes (Rhodanese, 3-Mercaptopyruvate Sulphurtransferase, Arginase And Thiaminase) in Some Commonly Consumed Plant Tubers in Nigeria.

Abstract

Four different enzymes (Rhodanese, 3-mercaptopyruvate sulphurtransferase (3-MST) , Arginase and thiaminase) activities were detected in crude plant extracts of nine randomly selected plant tubers which includes sweet potato (Ipomoea batatas), irish potato (Solanum tuberosum), white yam, yellow yam, bitter yam (Diascorea bulbifera), sweet yam (Diascorea esculentu), water yam (Diascorea alata), cocoyam and cassava (Manihot esculentu) . In each case, the enzymes exhibited high activities. The p value activity of 3-MST varies significantly in the various plant tuber. White yam showed the highest activity with a mean of 0.2 which varies significantly when compared to, red cocoyam with a mean of 0.005. Arginase was also seen to vary significantly in the different plant samples with Irish potato having the highest mean value of activity while cassava showed the lowest mean value. Thiaminase activity varied significantly in the plant tubers. Cassava stem had the highest mean value of thiaminase activity while bitter yam peel showed the lowest mean value of activity. These studies confirm the activities and nutritional values of these enzymes in the commonly consumed plant tubers.

Keywords: Plant Tubers, Arginase, Rhodanese, 3-Mercaptopyruvate Sulphurtransferase,        Thiaminase, Activity.