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This study was carried out to examine whether kimchi has hypolipidemic effect and to know how it exerts lipid-lowering effect in rats. Male Sprague-Dawley rats were fed with kimchi-free diet, or 3%, or 5%, or 10% kimchi diets for 6 weeks. Plasma cholesterol level was lowered in rats fed all concentrations of kimchi diets, and plasma triglyceride(TG) level was lowered in 10% kimchi diet group compared with that of control significantly(p<0.05). The intake of kimchi lowered VLDL-cholesterol and VLDL-TG levels, whereas increased HDL-cholesterol level significantly(p<0.05). LDL-cholesterol level was lowered only in 5% kimchi diet group and LDL-TG level was lowered in all kimchi diet groups compared with those of control significantly(p<0.05). The intake of 5% and 10% kimchi diets also lowered the levels of hepatic cholesterol, TG, total lipid, and apolipoprotein B, whereas increased the levels of fecal total fat, cholesterol, TG, and apolipoprotein A-1 significantly(p<0.05). Triiodothyronine(T₃) level was elevated in rats fed kimchi diet, whereas thyroxine(T₄) level was not affected by kimchi treatment. These observations support that the intake of kimchi in rats lowers plasma and hepatic lipid levels by increasing the excretion of TG and cholesterol through feces, by the elevation of T₃ level, and by the altered lipoprotein metabolism.
흰쥐에 있어서 김치의 섭취가 지질 농도를 저하시키는 효과가 있는지의 여부와 그 기작을 연구하기 위하여 Sprague Dawley 숫컷 흰쥐에 김치 무첨가 식이, 3%, 5%, 10%의 김치식이를 6주간 공급한 후 혈장, 지단백, 간에서의 지질조성과 분변으로의 배설능, apo단백 합 성능, 호르몬 level에 미치는 영향을 조사하였다. 혈장내 중성지질은 대조군에 비해 10% 김치섭취군에서 32% 저하하였으며(p<0.05), 혈장의 총콜레스테롤 함량은 모든 김치농도 섭취군에서 저하하였다. 김치섭취는 VLDL분획의 콜레스테롤과 중성지방 함량을 저하시켰으며(p<0.05), LDL분획의 콜레스테롤 농도를 상승시켰다(p<0.05). LDL분획의 콜레스테롤 농도는 김치 5% 섭취군에서 대조군 보다 낮게 나타났다(p<0.05). 간의 콜레스테롤, 중성지방, total lipid, Apo B 농도는 대조군에 비해 5%와 10% 김치섭취군에서 감소하였으며(p<0.05), 반면 분변중의 콜레스테롤, 중성지방, Apo A-1 농도는 증가하였다. 뿐만 아니라 김치의 섭취는 T₃ 농도의 증가를 유도하였으나(p<0.05), T₄에는 영향을 미치지 않았다. 이러한 결과는 김치를 섭취한 흰쥐에 있어서 김치가 혈중 콜레스테롤 농도와 간 콜레스테롤, 중성지방 농도를 효과적으로 감소시킴을 보여주며, 이러한 효과는 김치의 섭취가 분변으로의 콜레스테롤과 중성지방 배설을 증가시키고, T₃의 농도를 상승시키며, apo단백의 합성능에 영향을 미치기 때문인 것으로 사료된다.
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