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coffees of different origins and the same roasting degree (Medium)
can be ranked in increasing order as Brazil < Vietnam < Colo
mbia < Guatemala < Kenya. However, roasting degree seems to
influence conventional roasted coffees in differentway depending on
the origin or variety because DPPH increased with a higher roasting
degree (Dark versus Medium) for Colombia coffee (Arabica), but
decreased for Vietnam one (Robusta) (Medium versus Light). This
could be due to the fact that although Robusta coffee has higher
amounts of phenolic compounds than Arabica ones, roasting induces
a higher loss of these antioxidant compounds in Robusta coffees
(Clifford, 1997; Perrone, Donangelo, Donangelo, & Farah, 2010). In
fact, onlymoderate correlation between DPPH and L* values (0.483,
p < 0.001) has been found.
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