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Development of Hydrogels to Improve the Safety of Yukhoe (Korean Beef Tartare) by Reducing Psychrotrophic Listeria monocytogenes Cell Counts on Raw Beef Surfaceopen access

Authors
Oh, HyeminKim, SejeongLee, SoominHa, JimyeongLee, JeeyeonChoi, YukyungLee, YewonKim, YujinSeo, YeongeunYoon, Yohan
Issue Date
Dec-2018
Publisher
KOREAN SOC FOOD SCIENCE ANIMAL RESOURCES
Keywords
antimicrobial; hydrogel patch; natural antibiotic agent; Listeria monocytogenes; Yukhoe
Citation
KOREAN JOURNAL FOR FOOD SCIENCE OF ANIMAL RESOURCES, v.38, no.6, pp.1189 - 1195
Journal Title
KOREAN JOURNAL FOR FOOD SCIENCE OF ANIMAL RESOURCES
Volume
38
Number
6
Start Page
1189
End Page
1195
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/4147
DOI
10.5851/kosfa.2018.e50
ISSN
1225-8563
Abstract
This study developed an antimicrobial hydrogel to control Listeria monocytogenes in Yukhoe (Korean beef tartare). Four hydrogels (hydrogel 1: 5% alginate+1% chitosan+0.2% CaCl2, hydrogel 2: 1% kappa-carrageenan+1% chitosan, hydrogel 3: 2% kappa-carrageenan+1% CaCl2, and hydrogel 4: 2% kappa-carrageenan+3% CaCl2) were prepared. The hydrogels then absorbed 0.1% grapefruit seed extract (GSE) and 0.1% citrus extract (CE) for 30, 60, 120, and 240 min to be antimicrobial hydrogels. To select the most effective antimicrobial hydrogel, their swelling ratio (SR) and antilisterial activities were determined. The selected hydrogel (2x2 cm) was then placed on surface of beef (round; 3x3 cm), where L. monocytogenes (ca. 10(6) CFU/g) were inoculated, and the cell counts were enumerated on PALCAM agar. Among the hydrogels, the SR of hydrogel 1 increased with absorbing time, but other hydrogels showed no significant changes. Antimicrobial hydrogel 1 showed higher (p<0.05) antilisterial activity than other antimicrobial hydrogels, especially for the one absorbed the antimicrobial for 120 min. Thus, the antimicrobial hydrogel 1 absorbed antimicrobials for 120 min was applied on raw beef at 4 degrees C, and reduced (p<0.05) more than 90% of L. monocytogenes on raw beef. These results indicate that antimicrobial hydrogel 1 formulated with 0.1% GSE or 0.1% CE is appropriate to improve the safety of Yukhoe by reducing psychrotrophic L. monocytogenes cell counts on raw beef.
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