Effect of processing methods on phenolic contens of pumpkin
flour samples and their bioaccessibilities are presented in
(Table 3). Hot-air oven drying method had a positive effect on
free, bound and total phenolics of pumpkin flours. The higher
levels of phenolics might be responsible of the higher antioxidant
activity of the hot-air oven dried pumpkin flours as shown in
(Table 4). The highest total phenols (1237 mg of GAE 100 g1 DW)
was found in oven-dried pumpkin flour with metabisulfite pretreatment.
Similar results of increased phenolic contents with
high temperatures have also been reported in coffee (Nicoli,
Anese, Manzocco, & Ferici, 1997; Sanchez-Gonzalez, Jimenez-
Escrig, & Saura-Calixto, 2005) and mango seed kernel flour
(Soong & Barlow, 2004). This could probably be due to the formation
of phenolic substances during the drying process at 60 C
in a hot air oven. Que et al. (2008) reported that content of
phenolic compounds in hot air-dried pumpkin flour was higher
than that in freeze-dried pumpkin flour, indicating the formation
Effect of processing methods on phenolic contens of pumpkinflour samples and their bioaccessibilities are presented in(Table 3). Hot-air oven drying method had a positive effect onfree, bound and total phenolics of pumpkin flours. The higherlevels of phenolics might be responsible of the higher antioxidantactivity of the hot-air oven dried pumpkin flours as shown in(Table 4). The highest total phenols (1237 mg of GAE 100 g1 DW)was found in oven-dried pumpkin flour with metabisulfite pretreatment.Similar results of increased phenolic contents withhigh temperatures have also been reported in coffee (Nicoli,Anese, Manzocco, & Ferici, 1997; Sanchez-Gonzalez, Jimenez-Escrig, & Saura-Calixto, 2005) and mango seed kernel flour(Soong & Barlow, 2004). This could probably be due to the formationof phenolic substances during the drying process at 60 Cin a hot air oven. Que et al. (2008) reported that content ofphenolic compounds in hot air-dried pumpkin flour was higherthan that in freeze-dried pumpkin flour, indicating the formation
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