Effects of Irradiation on Antimicrobial Activity of Weak Organic Acid Preservatives

doi:10.7506/spkx1002-6630-201417012

Abstract

Abstract:

This study was intended to investigate the effect of 60Co γ-ray irradiation on the antimicrobial activity of weak
organic acid preservatives, potassium sorbate, sodium diacetate, sodium propionate, calcium propionate and sodium
acetate dehydrogenation. Irradiation dosages were set as 0, 5, 10 and 15 kGy. The target strains were Gram-negative (G–)
bacteria including Salmonella enteritidis, Shigella flexneri, Escherichia coli, and Gram-positive (G+) bacteria including
Listeria monocytogenes, Staphylococcus aureus, Bacillus subtilis and Leuconostoc mesenteroides. Meanwhile, the detection
wavelength and suitable preservative concentrations for microtiter plate assay were established. The results showed that
low dose irradiation under 5 kGy had little effect on the antimicrobial activity of preservatives, but 10–15 kGy irradiation
could increase the antimicrobial activity of most preservatives with a positive dose-effect relationship. Irradiation made the
antimicrobial activity of preservatives more sensitive in solution than in the solid state. It was observed that the change in
antimicrobial activity of preservatives to G+ bacteria after irradiation was more sensitivity than to G – bacteria.

Key words: irradiation, preservatives, antimicrobial activity, microtiter plate assay

CLC Number:

TQ047.6

LI Shu-jin, GAO Mei-xu, CUI Cheng-bi, LIU Chao-chao, MOU Hui, ZHAO Xin, WANG Zhi-dong. Effects of Irradiation on Antimicrobial Activity of Weak Organic Acid Preservatives[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201417012.

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Effects of Irradiation on Antimicrobial Activity of Weak Organic Acid Preservatives

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