Abstract

In order to improve the quality of traditional kochujang, submaterials like sea tangle and chitosan were added to kochujang and their effects on microbial characteristics, enzyme activities and physicochemical characteristics were investigated for 24 weeks of fermentation. The activities of $\alpha$,$\beta$-amylase in kochujmg were higher in sea tangle added at 2% level and chitosan added at 0.1% level. However, acidic protease activity decreased as the ratio of submaterials increased. Viable cells of yeasts in the kochujang increased rapidly for 4~8 weeks of fermentation, and bacterial counts decreased in submaterials added groups. Moisture contents of kochujang increased until 12 weeks of fermentation, but water activity decreased. As the ratio of sea tangle increased, water activity decreased. Consistency of kochujang increased after middle of fermentation, and they increased remarkably by addition of sea tangle. The degree of increase in total color difference ($\Delta$E) of sea tangle added group was lowest. The titratable acidity of kochujang decreased after 4 weeks, and they changed a little by addition of chitosan. Amino nitrogen contents of kochujang increased as mixing ratio of submaterials increased in the late period of aging. Ammonia nitrogen contents was lower in chitosan added kochujang at 24 week of fermentation. Reducing sugar contents of kochujang increased rapidly for 4~8 weeks of fermentation, and they increased as the ratio of chitosan increased. Ethanol contents of kochujang increased until 12~16 weeks of fermentation, with lower values in sea tangle added group. After 24 weeks of fermentation, the result of sensory evaluation showed that 0.1% chitosan added kochujang were more acceptable than sea tangle added kochujang in the taste, color and overall acceptability.all acceptability.

고추장의 품질향상을 위해 다시마와 키토산의 농도를 달리하여 첨가하고 2$0^{\circ}C$에서 24주간 숙성시키면서 효소활성도와 미생물상, 이화학적 튿성을 비교하였다. 고추장의 $\alpha$와$\beta$-amylase는 각각 다시마 2%. 키토산 01.%첨가구에서 조금 높은 활성을 보이나 산성 protease활성은 이들의 첨가농도가 증가하면 감소하였다. 효모수는 숙석 4~8주경에 $10^{5}$~$10^{6}$ CFU/g으로 증가하였고, 세균수는 키토산이나 다시마의 첨가로 감소하였다. 수분은 숙성 12주까지 서서히 증가하나 수분활성도는 감소하였고, 다시마 첨가구에서 낮았다. 점조성은 숙성 중기이후에 증가하였으며 다시마 첨가시 증가되었다. 고추장의 색도는 숙성 중 a값이 낮아졌고, 다시마 첨가량이 증가하면 a와 b값이 낮아졌다. $\Delta$E값은 고추장 숙성중 증가하나 다시마 첨가구에서 낮았다. 적정산도는 4주 이후에 감소되었으며, 키토산의 첨가농도가 높을수록 낮았다. 다시마와 키토산의 농도가 증가할수록 숙성 후기의 아미노태 질소는 많았고, 암모니아태 질소는 키토산 첨가구에서 낮았다. 환원당은 숙성 4~8주에 급격히 증가하였으며, 키토산 첨가량이 증가할수록 많았다. 알콜은 숙성 12~16주까지 증가되었으며, 다시마 첨가구에서 낮았다. 고추장의 맛과 색, 전반적인 기호도는 키토산 01.% 첨가시 좋았고, 다시마는 첨가량이 증가할수록 맛, 색, 향기 모두 낮은 판정을 받았다. 향기 모두 낮은 판정을 받았다.

Keywords

• kochujang;
• sea tangle;
• chitosan, microflora;
• Physicochemical properties