The antioxidant activity of black garlic
extracts was investigated using the DPPH scavenging, HO
radical scavenging and FRAP assay. Changes in the antioxidant
activities of black garlic during thermal processing
steps were shown in Fig. 5. The DPPH RSA increased
sharply from 30 to 76% during the first 3 days, continued to
rise up to 95% in the following 3 days and then came to a
maximum after 6 days of heat treatment. The DPPH radical
scavenging ability increased with increasing heat time from
0 to 10 days (P < 0.05), which suggested that the activity of
the black garlic samples was significantly higher than that of
the fresh garlic samples.