The Aster glehni extract has many therapeutic and medicinal
values. Therefore, it is essential to set appropriate conditions for enzyme
treatment to efficiently extract A. glehni. In this study,
changes in the quality of A. glehni extract depending on the
concentration and time of enzyme treatment was investigated to increase its
effective utilization. Compared to the control, the pH of the extract of
A. glehni its soluble solid content increased with the
enzyme treatment. The color of the A. glehni extract changed
from green-yellow to reddish-yellow with the increase in treatment duration. The
fructose and sucrose contents of the extract were the highest at 7.73%
and 6.78%, respectively, in the control group without the enzyme
treatment. Glucose and maltose contents were 6.91% and 4.44% in
the C group (3.2% enzyme concentration and 60 min for enzyme treatment),
respectively. Total polyphenol content, which shows antioxidant activity, was
the highest at 7.38 mg GAE/g in the E group (1.6% of enzyme concentration
and 120 min for enzyme treatment). 2,2-diphenylpicrylhydrazyl (DPPH) and
2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) showed the highest
radical scavenging activity in the C group (3.2% of enzyme concentration
and 60 min for enzyme treatment). These results enable setting appropriate
conditions of enzyme treatment in terms of enzyme concentration and time for the
production of dry powders using A. glehni extract.