• BMB Reports
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• 제38권5호
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• pp.563-570
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• 2005

Tamoxifen citrate (TAM), is widely used for treatment of breast cancer. It showed a degree of hepatic carcinogenesis. The purpose of this study was to elucidate the antioxidant capacity of green tea (Camellia sinensis) extract (GTE) against TAM-induced liver injury. A model of liver injury in female rats was done by intraperitoneal injection of TAM in a dose of $45\;mg\;Kg^{-1}\;day^{-1}$, i.p. for 7 successive days. GTE in the concentration of 1.5%, was orally administered 4 days prior and 14 days after TAM-intoxication as a sole source of drinking water. The antioxidant flavonoid; epicatechin (a component of green tea) was not detectable in liver and blood of rats in either normal control or TAM-intoxicated group, however, TAM intoxication resulted in a significant decrease of its level in liver homogenate of tamoxifen-intoxicated rats. The model of TAM-intoxication elicited significant declines in the antioxidant enzymes (glutathione-S-transferase,glutathione peroxidase, superoxide dismutase and catalase) and reduced glutathione concomitant with significant elevations transaminase) levels. The oral administration of 1.5% GTE to TAM-intoxicated rats, produced significant increments in the antioxidant enzymes and reduced glutathione concomitant with significant decrements in TBARS and liver transaminases levels. The data obtained from this study speculated that 1.5% GTE has the capacity to scavenge free radical and can protect against oxidative stress induced by TAM intoxication. Supplementation of GTE could be useful in alleviating tamoxifen-induced liver injury in rats.

• 한국식품위생안전성학회지
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• 제29권3호
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• pp.211-216
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• 2014

본 실험은 2012년부터 2013까지 4,318건의 다양한 식품으로부터 155건의 B. cereus를 분리하고 그 중 140건에 대하여 $25^{\circ}C$와 $70^{\circ}C$의 추출온도에 따라 마늘, 계피, 생강, 녹차 추출물의 항균력 시험을 실시하였다. 식품유형별 균분리율은 고춧가루(48.65%), 농산물(31.08%), 김치류(25.61%)가 높았으며 식중독원인으로 의심되었던 식품접객업소 조리식품에서는 1.17%가 분리되었다. 항균성 시험에서는 $25^{\circ}C$ 마늘 추출물과 $25^{\circ}C$와 $70^{\circ}C$ 녹차 추출물에서만 140개의 모든 분리주에서 억제환이 나타났다. 억제환의 크기는 $25^{\circ}C$에서 마늘 > 녹차 > 계피의 순으로 $70^{\circ}C$에서는 녹차 > 마늘 > 계피의 순으로 나타나 온도에 따른 항균성의 차이가 있음을 알 수 있었다. 각 추출물들의 상관관계 분석에서 $25^{\circ}C$에서는 마늘과 녹차, 계피와 녹차가 유의적인 차이를 나타내었고 $70^{\circ}C$에서는 마늘과 녹차만이 유의적인 차이를 나타내었다.