Development of Hydrogels to Improve the Safety of
Yukhoe (Korean Beef Tartare) by Reducing Psychrotrophic
Listeria monocytogenes Cell Counts on Raw Beef Surface.
Korean J Food Sci Anim Resour 2018;
38:1189-1195. [PMID:
30675111 PMCID:
PMC6335136 DOI:
10.5851/kosfa.2018.e50]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 10/23/2018] [Accepted: 10/23/2018] [Indexed: 11/06/2022] Open
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% κ-carrageenan+1% chitosan, hydrogel 3: 2%
κ-carrageenan+1% CaCl2, and hydrogel 4: 2%
κ-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 (2×2 cm) was then placed on
surface of beef (round; 3×3 cm), where L. monocytogenes
(ca. 106 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℃, 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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