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Table 2 Log reductions of S. Typhimurium in 72, 48, 36, 24, and 18 °Brix apple juice subjected to ohmic heating at 30 and 60 V/cm

From: Investigation of optimum ohmic heating conditions for inactivation of Escherichia coli O157:H7, Salmonella enterica serovar Typhimurium, and Listeria monocytogenes in apple juice

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

0.64 ± 0.30

AB

0.72 ± 0.28

B

1.23 ± 0.28

B

0.90 ± 0.20

B

1.06 ± 0.77

B

1.40 ± 0.44

B

48

0.00 ± 0.00

A

0.52 ± 0.21

B

0.33 ± 0.15

AB

0.69 ± 0.18

BC

1.08 ± 0.30

C

1.86 ± 0.54

D

2.88 ± 0.48

E

36

0.00 ± 0.00

A

0.29 ± 0.06

AB

0.43 ± 0.15

B

0.80 ± 0.08

C

1.62 ± 0.25

D

3.99 ± 0.33

E

6.71 ± 0.13

F

24

0.00 ± 0.00

A

0.22 ± 0.19

A

0.31 ± 0.14

A

0.93 ± 0.26

B

1.81 ± 0.25

C

3.42 ± 0.50

D

6.70 ± 0.16

E

18

0.00 ± 0.00

A

0.09 ± 0.10

A

0.17 ± 0.11

AB

0.48 ± 0.23

B

0.87 ± 0.07

C

1.44 ± 0.22

D

3.27 ± 0.40

E

60 V/cm

72

0.00 ± 0.00

A

0.61 ± 0.12

AB

0.90 ± 0.30

B

1.00 ± 0.51

B

1.06 ± 0.54

B

1.26 ± 0.30

B

1.20 ± 0.66

B

48

0.00 ± 0.00

A

0.42 ± 0.44

A

5.81 ± 0.06

B

ND

 

ND

 

ND

 

ND

 

36

0.00 ± 0.00

A

0.83 ± 0.32

B

6.10 ± 0.24

C

ND

 

ND

 

ND

 

ND

 

24

0.00 ± 0.00

A

0.79 ± 0.88

A

6.61 ± 0.13

B

ND

 

ND

 

ND

 

ND

 

18

0.00 ± 0.00

A

0.65 ± 0.45

B

6.68 ± 0.14

C

ND

 

ND

 

ND

 

ND

 
  1. aThe values are means ± standard deviations from three replications. Values in the same row followed by the same letter are not significantly different (P > 0.05). ND not detected.