Especially, the
color deterioration is ineluctable during drying process of
peppers, which would results in the destruction of carotenoids
. The red color of pepper increasingly fades
out to become brown as temperature increased, which is mainly
attributed to the degradation of carotenoid pigments and the
development of browning compounds . It
was reported that major pigment losses ca. 60% in total content
of carotenoids by applying conventional air-drying techniques
during industrial processing . Other report showed that carotenoids
decrease rapidly and the content of carotenoids has a negative
effect with drying air temperature .
Moreover, traditional sun-drying may lead to a decrease of
the carotenoid contents of more than 80%).