4. Conclusions
In this study, the storage stability and antioxidant activity of
astaxanthin/HPCD complex were evaluated. Both native astaxanthin
and the complex showed high stability under storage
condition at 4 ◦C and 25 ◦C. Complexation improved the stability
of astaxanthin under storage conditions. Both astaxanthin and
astaxanthin/HPCD complex had high antioxidant activity in vitro.
Compared with ascorbic acid, the reducing power and DPPH radical
scavenging activity of astaxanthin were lower in the water due
to the poor solubility and self-assembly; the complex was stronger
at low concentration for solubility enhancing effect of HPCD. However,
the activity decreased at high concentration for the difficult
release of astaxanthin in the complex. Astaxanthin and the complex
were about dozens of higher than ascorbic acid in the hydroxyl
radical scavenging activity, and the complex was a little lower than
native astaxanthin. In summary, complexation with HPCD could
affect the antioxidant activity of astaxanthin; it should be improved
at low concentration aqueous solution, but hindered at high due to
the controlled-release effect. More detailed studies are underway in
our laboratory to understand the storage stability and antioxidant
potential of astaxanthin/HPCD complex in the food system.
4. ConclusionsIn this study, the storage stability and antioxidant activity ofastaxanthin/HPCD complex were evaluated. Both native astaxanthinand the complex showed high stability under storagecondition at 4 ◦C and 25 ◦C. Complexation improved the stabilityof astaxanthin under storage conditions. Both astaxanthin andastaxanthin/HPCD complex had high antioxidant activity in vitro.Compared with ascorbic acid, the reducing power and DPPH radicalscavenging activity of astaxanthin were lower in the water dueto the poor solubility and self-assembly; the complex was strongerat low concentration for solubility enhancing effect of HPCD. However,the activity decreased at high concentration for the difficultrelease of astaxanthin in the complex. Astaxanthin and the complexwere about dozens of higher than ascorbic acid in the hydroxylradical scavenging activity, and the complex was a little lower thannative astaxanthin. In summary, complexation with HPCD couldaffect the antioxidant activity of astaxanthin; it should be improvedat low concentration aqueous solution, but hindered at high due tothe controlled-release effect. More detailed studies are underway inour laboratory to understand the storage stability and antioxidantpotential of astaxanthin/HPCD complex in the food system.
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