TABLE 4.
Changes in color, DPPH free radical scavenging activity, and total phenols in apple juice during 222-nm KrCl excilamp treatment
| Treatment dose (mJ/cm2) | Quality valuea
|
||||
|---|---|---|---|---|---|
| Color |
DPPH free radical scavenging activity (%) | Total phenols (mg GAE/liter) | |||
| L* | a* | b* | |||
| 0 | 24.52 ± 0.63 | 0.41 ± 0.05 | 4.76 ± 0.10 | 84.12 ± 0.52 | 42.39 ± 0.63 |
| 197 | 24.44 ± 0.61 | 0.43 ± 0.01 | 4.75 ± 0.08 | 84.44 ± 0.16 | 42.20 ± 0.36 |
| 591 | 24.69 ± 0.85 | 0.42 ± 0.03 | 4.78 ± 0.10 | 84.48 ± 0.44 | 42.58 ± 0.51 |
| 985 | 24.35 ± 0.67 | 0.43 ± 0.06 | 4.79 ± 0.23 | 84.76 ± 0.50 | 42.44 ± 0.60 |
| 1,379 | 24.43 ± 0.43 | 0.42 ± 0.06 | 4.82 ± 0.13 | 84.26 ± 0.60 | 42.29 ± 0.55 |
| 1,773 | 24.00 ± 0.92 | 0.43 ± 0.08 | 4.86 ± 0.09 | 84.58 ± 0.18 | 42.63 ± 0.36 |
a
Data are means ± standard deviations for three replications. All quality values showed no significant (P > 0.05) difference from untreated controls during treatment at 197 to 1,773 mJ/cm2.