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Effect of Copper Ions on Over-Acidification of kimchi  

채경연 (세종대학교 생활과학과)
유양자 (세종대학교 생활과학과)
경규항 (세종대학교 식품공학과)
박세원 (동해대학교 관광외식산업과)
김연순 (조선대학교 가정교육과)
Publication Information
Korean journal of food and cookery science / v.18, no.1, 2002 , pp. 87-93 More about this Journal
Abstract
Effect of copper ions (Cu$\^$+/ and Cu$\^$2+/) on the fermentation of kimchi, especially on their effect on the prevention of over-acidification of kimchi, was investigated. The effect of Cu$\^$2+/ ion on the growth of individual lactic acid bacterium originally isolated from kimchi was also investigated. The addition of Cu$\^$+/($\geq$4.0mM) or Cu$\^$2+/($\geq$3.0mM) ions in kimchi effectively inhibited growth of lactic acid bacteria and maintained a titratable acidity of less than 1.0% for a periods of 14 days. Leuconostoc mesenteroides significantly decreased at the 10th day of fermentation in control kimchi, whereas the group with Cu$\^$+/ and Cu$\^$2+/ showed 10$\^$5/-10$\^$6/ CFU/ml at the 14th day of fermentation. This indicates that the addition of Cu$\^$+/ and Cu$\^$2+/ inhibited the production of excessive acids by inhibiting lactic acid bacteria, and allowed Leu. mesenteroides stay alive longer. Fe$\^$2+/ and SO$_4$$\^$2-/ ions did not have any effect on the fermentation of kimchi. Cu$\^$2+/ inhibited growth of all lactic acid bacteria tested, such as Leu. mesenteroides 6, Streptococcus faecalis 12, Lactobacillus plantarum 14, Lac. brevis 15, Leu. mesenteroides LA 10, and Lac. plantarum LA 97.
Keywords
copper ions; over-acidification of kimchi; lactic acid bacteria;
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