Table 3 Log reductions of L. monocytogenes in 72, 48, 36, 24, and 18 °Brix apple juice subjected to ohmic heating at 30 and 60 V/cm
Voltage | Log reduction [log10 (N0/N)]a by treatment time (s) | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gradient | °Brix | 0 | 10 | 20 | 30 | 40 | 50 | 60 | |||||||
30 V/cm | 72 | 0.00 ± 0.00 | A | 0.34 ± 0.15 | A | 0.32 ± 0.16 | A | 0.34 ± 0.06 | A | 0.32 ± 0.22 | A | 0.37 ± 0.32 | A | 0.47 ± 0.49 | A |
48 | 0.00 ± 0.00 | A | 0.21 ± 0.08 | AB | 0.36 ± 0.13 | B | 0.52 ± 0.14 | BC | 0.73 ± 0.30 | C | 1.34 ± 0.12 | D | 1.74 ± 0.24 | E | |
36 | 0.00 ± 0.00 | A | 0.43 ± 0.20 | B | 0.42 ± 0.14 | B | 0.67 ± 0.19 | B | 1.10 ± 0.18 | C | 1.90 ± 0.22 | D | 5.01 ± 0.35 | E | |
24 | 0.00 ± 0.00 | A | 0.04 ± 0.08 | A | 0.13 ± 0.12 | A | 0.21 ± 0.13 | A | 0.74 ± 0.20 | B | 1.18 ± 0.37 | C | 3.91 ± 0.26 | D | |
18 | 0.00 ± 0.00 | A | 0.07 ± 0.13 | A | 0.04 ± 0.10 | A | 0.27 ± 0.19 | A | 0.23 ± 0.28 | A | 0.42 ± 0.24 | A | 1.13 ± 0.41 | B | |
60 V/cm | 72 | 0.00 ± 0.00 | A | 0.31 ± 0.14 | A | 0.23 ± 0.12 | A | 0.33 ± 0.19 | A | 0.40 ± 0.31 | A | 0.40 ± 0.25 | A | 0.38 ± 0.40 | A |
48 | 0.00 ± 0.00 | A | 0.57 ± 0.28 | B | 5.71 ± 0.27 | C | ND | ND | ND | ND | |||||
36 | 0.00 ± 0.00 | A | 1.46 ± 0.09 | B | 5.71 ± 0.23 | C | ND | ND | ND | ND | |||||
24 | 0.00 ± 0.00 | A | 0.50 ± 0.42 | A | 5.83 ± 0.13 | B | ND | ND | ND | ND | |||||
18 | 0.00 ± 0.00 | A | 0.66 ± 0.11 | B | 5.94 ± 0.20 | C | ND | ND | ND | ND | |||||