Treatment with chlorous acid to inhibit spores of Alicyclobacillus acidoterrestris in aqueous suspension and on apples.
OBJECTIVE
To test the efficacy of a chemical (chlorous acid) for reducing the numbers of viable Alicyclobacillus acidoterrestris spores in laboratory media and on apples.


RESULTS
Alicyclobacillus acidoterrestris spores in aqueous suspension and on apple surfaces of four different cultivars were treated with 268 ppm chlorous acid. Treatment with 268 ppm chlorous acid sharply reduced the numbers of spores of A. acidoterrestris in laboratory media by 1.6, 4.3, and 7.0 log(10) reductions for 5, 10, and 15 min treatments, respectively. Chlorous acid also effectively reduced the spore load on apple surfaces. Alicyclobacillus acidoterrestris spore counts were significantly reduced by about 5 log(10) after 10 min treatment on four different apple cultivars ('Red Delicious', 'Golden Delicious',' Gala', and 'Fuji'). There was no synergistic effect on spore reduction when chlorous acid treatment was combined with heat.


CONCLUSIONS
These results show that chlorous acid is highly efficacious against A. acidoterrestris spores on apple surfaces.


CONCLUSIONS
Chlorous acid can be used as an alternative sanitizer of chlorine to control a major A. acidoterrestris contamination source in juice processing plants.
Department of Food and Nutrition, Chung-Ang University, Anseong-si, Gyeonggi-do, South Korea.
S-Y
SY
Lee
S-R
SR
Ryu
D-H
DH
Kang
D056450:Alicyclobacillus / Q000187:drug effects* / Q000528:radiation effects; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002712:Chlorides / Q000494:pharmacology*; D015169:Colony Count, Microbial; D006358:Hot Temperature; D027845:Malus / Q000382:microbiology*; D050296:Microbial Viability / Q000187:drug effects; D013171:Spores, Bacterial / Q000187:drug effects* / Q000528:radiation effects; D013997:Time Factors
D000900:Anti-Bacterial Agents; D002712:Chlorides; C063160:chlorous acid