• Asian-Australasian Journal of Animal Sciences
• /
• 제24권12호
• /
• pp.1681-1689
• /
• 2011

The beneficial effects of tea catechins (TCs) are related not only to their antioxidant potential but also to the improvement of animal meat quality. In this study, we assessed the effects of dietary TC supplementation on plasma biochemical parameters, hormone responses, and glutathione redox status in goats. Forty Liuyang goats were randomly divided into four equal groups (10 animals/group) that were assigned to four experimental diets with TC supplementation at 4 levels (0, 2,000, 3,000 or 4,000 mg TC/kg DM feed). After a 60-day feeding trial, all goats were slaughtered and sampled. Dietary TC treatment had no significant effect on blood biochemical parameters, however, low-density lipoprotein cholesterol (p<0.001), triglyceride (p<0.01), plasma urea nitrogen (p<0.01), and glucose (p<0.001) decreased and total protein (p<0.01) and albumin (p<0.05) increased with the feeding time extension, and day 20 was the turning point for most of changes. Interactions were found in glutathione (p<0.001) and the ratio of reduced and oxidized glutathione (p<0.05) in whole blood between treatment and feeding time. Oxidized glutathione in blood was reduced (p<0.05) by 2,000 mg TC/kg feed supplementation, and a similar result was observed in longissimus dorsi muscle. Though plasma glutathione peroxidase (p<0.01) and glutathione reductase (p<0.05) activities were affected by treatment and feeding time interactions, and glutathione S-transferases activity increased with feeding day extension, no changed values appeared in longissimus dorsi muscle. In conclusion, dietary TC supplementation affected the concentrations of some blood metabolites and accelerated GSH depletion in the blood of goats. In terms of less high-density lipoprotein cholesterol, the highest insulin and IGF-I concentrations, the highest ratio of reduced and oxidized glutathione in plasma, the dosage of 2,000 mg TC/kg feed might be desirable for growing goats to prevent glutathione depletion and keep normal physiological metabolism.

• Journal of Ginseng Research
• /
• 제11권1호
• /
• pp.32-38
• /
• 1987

수납시기 6년근 수삼의 동체중심부의 유리아미노산 조성을 지상부의 고사유무와 관련하여 조사하였다. 유리아미노산의 총합은 고사경의 경우에 증가하는 경향이나 유의성은 없었다. 유리아미노산 총합(3.5~49% 건중)은 ninhydrin법에 의한 총유리아미노산 함량과 차이가 컸으며 이는 수용성비단백질 분획에 상당량의 유리아미노산 이외의 ninhydrin 반응물이 있음을 나타낸다. 경의 고사가 유리아미노산 조성유이도에 영향을 주지는 아니하였다. 17개 아미산중 10개가 경고사에 의하여 증가하는 경향을 보였고 두개(glutamic acid, cysteine)는 감소경향을 보였다. 주요 amino acid는 arginine(상대함량 58%), glycine(6.2), lysine(5.9), serine(5.7), glutamic acid(4.2), aspartic acid(3.5)였다. 이상의 결과는 조기낙엽이나 경고사가 유리아미노산을 감소시키지 아니하므로 유리아미노산이 내백과 관계되지 아니함을 강력히 시사한다. 보고된 모든 경우에 arginine의 함량이 가장 높으므로 질소 대사에 중요한 역할이 있을 것이다. 본 조사결과가 기타 보고된 것과 유리아미노산 조성 유사도에서 arginine을 제외한 경우 유의성이 없는 것을 주로 alanine, phenylalanine, glycine및 proline의 변화 때문이다.