분자량(223, 746, 1,110 및 2,025 kDa)이 다른 chitosan으로 제조한 chitosan-ascorbate(CA223, CA746, CA1110, CA2025)를 각각 0.1%씩 첨가한 물김치의 저장중 항산화 활성 변화를 조사하였으며, 그 중 $10^{circ}C$에서 20일간 저장한 CA2025 첨가 물김치국물의 투여(5 mL/kg)가 고콜레스테롤식이 흰쥐 간 조직의 항산화능에 미치는 영향을 조사하였다. 동물실험은 정상식이군(NC), 고콜레스테롤 식이군(HC), 고콜레스테롤 식이 김치국물 투여군(HCKC), 고콜레스테롤 식이 CA2025 함유 김치국물 투여군(HCCA), 고콜레스테롤 식이 CA2025 1/2 농축액 투여군(HC2CA)의 5개군으로 구분하여 5주간 사육하였다. 20일간 저장한 CA첨가 물김치의 전자공여능은 84.74~89.13%로 증류수 및 0.2% ascorbic 물김치의 35.04 및 75.04%에 비하여 높았다. SOD 활성은 chitosan의 분자량이 클수록 증가하였으며(p<0.05), 무첨가 물김치 보다 10배 이상의 높은 활성을 나타내었다. HCCA군과 HC2CA군의 체중은 HC군에 비하여 각각 6.9%, 및 8.4%가 감소되었다. 간 조직의 GSH 함량은 HCCA군 및 HC2CA군이 각각 5.39 및 $4.80{mu}mole/g$ tissue로 HC군보다 22.5 및 9.1%가 증가하였다. HCCA군 및 HC2CA군의 GST 활성은 HC군에 비하여는 각각 219.9% 및 153.79%가 높았으며, NC군 보다도 높았다. SOD 활성은 HCCA 군이 HC2CA군 보다 높은 활성이 나타났으며, NC군 및 HC군 보다 높았다.
This study was to investigate the effect of 0.1% chitosan-ascorbate (CA) prepared with different molecular weight (223, 746, 1,110 and 2,025 kDa) of chitosan on the changes in antioxidant activity of mul-kimchi during storage at $10^{circ}C$ for 20 days. Animal experiments were divided to 5 groups; normal control group (NC), high cholesterol diet group (HC), high cholesterol diet mul-kimchi diet group (HCKC), high cholesterol diet and CA2025 containing mul-kimchi administrated group (HCCA), and high cholesterol diet and 1/2 concentrated CA containing mul-kimchi administrated group (HC2CA). Mul-kimchi juice was administered 0.5 mL per 100 g body weight once a day and fed for 5 weeks. Electron donating activity of the 20 days-stored mul-kimchi with 0.1% CA showed higher activity (84.74~89.13%) than those of control and ascorbic acid mul-kimchi (35.04 and 75.04%). Superoxide dismutase activities of the kimchijuice with CA were higher in the higher molecular of chitosan. In the animal experiments, the average body weight of the HCCA and HC2CA group were lower 6.9% and 8.4% than that of HC control group, respectively. Hepatic glutathione content in HCCA and HC2CA group was increased 22.5% and 9.1% as compared to HC group. Hepatic glutathione S-transferase activities were significantly increased in the HCCA (219.9%) and HC2CA group (153.8%) compared to NC group. Hepatic superoxide dismutase activity was highest in the HCCA group, and the activities in CA groups were higher than those of NC and HC group.
