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Radiation processing for elimination of Salmonella typhimurium from inoculated
seeds used for sprout making in India and effect of irradiation on germination
of seeds
Journal of Food Protection, Volume 70, Number 8, August 2007 , pp. 1961-1965(5)
Saroj, Sunil D.; Hajare, Sachin; Shashidhar, R.; Dhokane, Varsha; Sharma, Arun;
Bandekar, Jayant R.
The effect of radiation processing on the germination of the sprout seeds mung (Phaseolus
aureus), matki (Phaseolus aconitifolius), chana (Cicer arietinum), and vatana (Pisum
sativum) in terms of percent germination, germination yield, sprout length,
vitamin C content, and texture was investigated. Gradual decreases in the
percent germination, germination yield, and sprout length with increases in
radiation dose (0.5 to 2.0 kGy) were observed. Vitamin C content and texture
remained unaffected for the seeds treated with doses of up to 2 kGy. To
determine the efficacy of radiation treatment in elimination of foodborne
pathogens, seeds inoculated with 4 log CFU/g of Salmonellla Typhimurium were
treated with radiation doses of 1 and 2 kGy. A reduction in counts of Salmonella
Typhimurium in inoculated seeds after radiation treatment was observed. A
radiation dose of 2 kGy resulted in the complete elimination of 4 log CFU/g of
Salmonella Typhimurium from the inoculated seeds. However, on sprouting for 48
h, the count of Salmonella Typhimurium reached 8 log CFU/g for the control seeds
and the seeds treated with a 1-kGy radiation dose. The aerobic plate counts for
seeds were 2.0 to 2.6 log CFU/g, which were reduced to 0.9 to 1.2 log CFU/g on
treatment with a 2-kGy radiation dose. On sprouting for 48 h, the aerobic
plate count reached 8 log CFU/g for both the control and radiation-treated
seeds. The study demonstrates that irradiation can control bacterial levels
on seeds but not contamination introduced during posttreatment handling.
Therefore, radiation processing of the final product (sprouts) is
recommended, rather than of the seeds.
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