3.7.3. Ascorbate peroxidase (EC 1.11.1.11) and guaiacol peroxidase
(EC 1.11.1.7)
ASA-POD and G-POD activities of raspberry fruits treated with
Aloe vera gel increased initially and then decreased during storage
(Fig. 4). After 8 days of storage, 50% Aloe vera gel had the highest
ASA-POD activities in raspberry fruit; while 75% Aloe vera gel
treatment had the highest G-POD activities. The control treatment
had the lowest ASA-POD and G-POD activities. ASA-POD, involved
in the detoxification of H2O2, uses two molecules of ascorbate to
reduce H2O2 to water (Noctor & Foyer, 1998). Since the biological
function of G-POD and ASA-POD is removal of H2O2 and other hydroperoxides,
higher activities of G-POD and ASA-POD in treated
raspberry fruits with Aloe vera gel would be beneficial for protection
against lipid peroxidation and DNA hydroperoxides in the
fruits (Chaudiere & Ferrari-Iliou, 1999).