As observed by Guine et al. (2015), many authors have previously
reported that polyphenolics are heat sensitive and that prolonged
heat treatment causes irreversible chemical changes to
phenol contents (Lin, Durance, & Scaman, 1998; Mejia-Meza et al.,
2008), this being attributed to different phenomena occurring
during heat treatment. According to Martín-Cabrejas et al. (2009)
and Qu, Pan, and Ma (2010), this may be attributed to the binding
of polyphenols with other compounds or to alterations in the
chemical structure of polyphenols. Julkunen-Tiitto and Sorsa (2001)
observed a destruction of flavonoids and tannins during drying.
Other authors suggested that another factor contributing to the
degradation of polyphenols may be the activity of polyphenol oxidase,
organic acid content, sugar concentration, and pH
As observed by Guine et al. (2015), many authors have previouslyreported that polyphenolics are heat sensitive and that prolongedheat treatment causes irreversible chemical changes tophenol contents (Lin, Durance, & Scaman, 1998; Mejia-Meza et al.,2008), this being attributed to different phenomena occurringduring heat treatment. According to Martín-Cabrejas et al. (2009)and Qu, Pan, and Ma (2010), this may be attributed to the bindingof polyphenols with other compounds or to alterations in thechemical structure of polyphenols. Julkunen-Tiitto and Sorsa (2001)observed a destruction of flavonoids and tannins during drying.Other authors suggested that another factor contributing to thedegradation of polyphenols may be the activity of polyphenol oxidase,organic acid content, sugar concentration, and pH
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