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Inhibitory Effects of Chitosanascorbate on Growth of Staphylococcus aureus and Escherichia coli Contaminated in Flounder during Storage  

Kim, Young-Sook (Department of Food and Nutrition, Daegu University)
Oh, Seung-Hee (Department of Nutrition & prepared industrial Pohang College)
Kim, Soon-Dong (Department of Food Science and Technology, Catholic University of Daegu)
Publication Information
Food Science and Preservation / v.16, no.1, 2009 , pp. 128-133 More about this Journal
Abstract
We performed an experiment of keeping the extension of raw and semi-dried flounder (Pleuronectes herzensteini). The effect of with (WG) or without gill (OG), drying degree (20% drying: 20D, 40% drying: 40D) and storage temperature($5^{\circ}C$) and 0.1% chitosan-ascorbate (CA) treatment of vacuum packaging flounder on the growth of contaminated microorganism during storage for 10 days were investigated. Total aerobacter (TA) in the OG-treated raw flounder was $0.29{\sim}0.44$ log cycle lower than that of WG-treated flounder. Also, the number of Staphylococcus aureus (SA) and E. coli (EO) in OG were lower compared with WG. The number of TA, SA and EO in 20 D among 0 D, 20 D and 40 D stored at $5^{\circ}C$ were lowest. Especially, the SA and EO was $0.13{\sim}0.53$, 0.3-0.88, and 0.13-0.74 log cycle lower compared with raw flounder. The growth of TA, SA and EO separated from raw flounder in tryptic soy broth were completely inhibited by 0.1% CA. The anti-biotical effect of CA of two microorganisms SA and EO that separated from flounder, and the growth of all of them were 90% (SA), 96% (EO) inhibited at the 0.1% CA. The inhibition times at $37^{\circ}C$ in soy broth was 36 hr. However when CA was added directly to flounder, it appeared inhibition effect to 0.88 log cycle. The effect of CA was better when gills removed and 20% drying.
Keywords
flounder (Pleuronectes herzensteini); chitosan-ascorbate; drying degree; shelf-life; storage;
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