system presented a higher reduction. With reference to the Chroma
values, no significant differences were observed for system coated
while a significant (p < 0.001) reductionwas recorded for uncoated
one, due to air drying (Table 4). This suggests a protecting action of
the starch coating used during the air drying process from the point
of view of the color. Flores (2006) reported a low oxygen permeability
of tapioca starch coatings, and this property could in part
explain their capacity to protect pumpkin color specially avoiding
AA and ferrous iron oxidation. Lago-Vanzela et al. (2013) assayed
edible coatings from native and modified starches on pumpkin
during drying and reported that dehydrated coated products had a
better color and a significantly higher retention of trans-a-carotene
and trans-b-carotene than products that did not receive coating.
They claimed that the good carotenoid retention determined in the
samples covered with modified cassava starch suggested that the
coating worked as an efficient barrier against oxygen (Lago-Vanzela
et al., 2013).