SOD enzyme activities of raspberry fruits stored for 8 days were
varied among treatments and storage durations as shown in Fig. 3.
SOD activities reduced with storage time. SOD activity of raspberry
fruits remained steady during the first 3 days of storage and then
decreased during the rest of storage. The entire raspberry fruits
treated with Aloe vera gel had higher SOD enzyme activities than those from control fruit. SOD enzyme, a class of metal containing
proteins, catalyze the dismutation reaction of superoxide radical
anions into H2O2 and molecular oxygen (Scandalios, 1993). Three
different types of SOD enzyme exist according to their metal
cofactor: Cu/Zn-SOD, Mn-SOD, and Fe-SOD (McKersie et al., 1993).
However, in this study, we measured only the total SOD enzyme
activity in raspberry fruits treated with Aloe vera gel. The results
showed that SOD activities reduced in all treatments during
storage.