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茶花的安全性评价及茶黄素和茶籽黄酮苷对呼吸链酶作用机理的研究
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摘要
茶花和茶籽包含许多功能成分,在食品、饮料、化妆品等领域具有广阔的应用前景。茶花具有多种生物功能,在中国民间用于除臭、护肤、化痰止咳。为了茶树花相关产品的市场化,本研究对茶树花安全性进行了评价。急性毒性试验表明茶树花提取物对试验动物无影响,LD50>12. 0g/kgBW,属实际无毒级。Ames试验、小鼠骨髓嗜多染红细胞微核试验、小鼠精子畸形试验结果都表明供试样品无致突变作用。90天喂养试验证明茶树花提取物对大鼠体重、食物利用率、血液学、血生化、脏体比和病理组织均无显著影响,表明茶树花提取物在测试剂量范围内是安全的。这为茶树花相关产品的研发和市场化奠定了基础。
     茶黄素是红茶中重要的多酚类物质,具有抗氧化、抗肿瘤等生物活性。本研究发现茶黄素四种常见单体(TF1, TF2A, TF2B,TF3)和表没食子儿茶素没食子酸酯(EGCG)对大肠杆菌呼吸链复合体I、NDH-2和ATP合成酶具有抑制作用。所有供试样品能够抑制复合体I和NDH-2的NADH氧化酶活性。TF3活性最强,是复合体I的竞争性抑制剂,NDH-2的反竞争性抑制剂。此外,TF3能够抑制复合体I NADH-HAR还原酶活性,且为其反竞争性抑制剂。这表明TF3在复合体I上不止有一个结合位点。TF3能够显著抑制复合体I、NDH-2和活体细胞的超氧化物产生,但这与其对酶的抑制作用无关。
     四种茶黄素单体和EGCG能够不同程度的抑制大肠杆菌ATP的水解,这在细胞膜和纯化的F,中都得到证实。相对于EGCG而言,茶黄素抑制质子跨膜传递的能力更强。
     利用分子对接技术对茶黄素四单体和EGCG进行在线虚拟筛选,发现了许多新的潜在靶标蛋白,这对指导未来的茶叶功能成分研究具有重要意义。
     本研究采用超临界提取和LC-MS技术成功提取并鉴定了茶籽饼中两种山奈酚黄酮苷,并对二者与对大肠杆菌复合体I和ATP合酶的互作进行了初步探讨。研究表明萃取时间、压力、温度和夹带剂乙醇浓度都能够显著影响目标产物的得率。最佳超临界提取工艺为萃取时间150 min,压力20 MPa,温度80℃,夹带剂乙醇浓度60%。该条件下实际得率为1.4±0.4 mg/g,与预测值11.9 mg/g无显著差异。两种化合物经LC-MS鉴定为山奈酚-3-0-[2-0-β-D-吡喃半乳糖基-6-0-α-L-吡喃鼠李糖基]-β-D-吡喃葡萄糖苷和山奈酚-3-0-[2-0-β-D-吡喃木糖基-6-0-α-L-吡喃鼠李糖基]-β-D-吡喃葡萄糖苷。然而,两种化合物在较高浓度时(100gM)对大肠杆菌复合体I和ATP合酶的活性均无影响,是否具有其它生物功能有待进一步研究。
Tea seeds and tea flowers contain a variety of bioactive ingredients, and can be used in the production of food, drink and cosmetic. Tea flowers possess many physiological functions and have been used in traditional medicines for deodorization, skin care, cough suppressant and expectorant in China. However, the lack of information about Tea flowers'possible toxicity restricts its application. The present investigation was carried out to evaluate the safety of tea flower extract by acute and genetic and subchronic toxicity studies. In the acute toxicity study, all animals gained weight and appeared active and normal, so the LD50 value must be>12.0 g/kg body weight. In the Ames test, micronucleus formation test and sperm abnormalities test, tea flower extract didn't have genotoxic potential. In the subchronic toxicity study, no dose-related effects on survival, growth, hematology, blood chemistry, organ weights, or pathologic lesions were observed.
     Theaflavins are a major group of polyphenol compounds in black tea and have strong antioxidant, anticancer and other bioactive properties. The inhibition effects of tea theaflavin (TF1), theaflavin-3-gallate (TF2A), theaflavin-3'-gallate (TF2B), theaflavin-3,3'-digallate (TF3) and epigallocatechin gal late (EGCG) on complex I, NDH-2, and ATP synthase from Escherichia coll were investigated. All the chemicals suppressed NADH-oxidase reactions catalyzed by complex I or NDH-2 on membrane vesicles. TF3 was the most potent inhibitor, and acted as a competitive inhibitor of complex I and a uncompetitive inhibitor of NDH-2 with respect to NADH. TF3 inhibited NADH-artificial acceptor(HAR) reductase activity, and was an uncompetitive inhibitor of complex I with respect to HAR. These results indicated that TF3 combined with more than one site on complex I. TF3 significantly decreased superoxide production by complex I, NDH-2 and cells, which was not contribute to the inhibition of the enzymes.
     Four theaflavin monomers and EGCG all inhibited ATP hydrolysis in both F1Fo membrane preparations as well as in isolated purified F,, but to different degrees. Compared with EGCG, theaflavin monomers had more effect on the inhibition of proton pumping by the membrane vesicle.
     Targets of Four theaflavin monomers and EGCG were searched on protein database by virtual screening based on molecular docking. Many new potent targets were found. These results were of big interest for further researches on the bioactivities of tea.
     A fast and efficient procedure was developed for the purification of two kaempferol glycosides from tea seed cake using supercritical fluid extraction (SFE). Conditions to obtain the highest total yield were determined to be an extraction time of 150 min, pressure of 20 MPa, temperature of 80℃, and 60% aqueous ethanol solution. Using the optimal conditions, the experimental yield was 11.4±0.4 mg/g, which was similar to the value predicted by the model. The glycosides of these two kaempferols identified by LC-MS were 3-0-[2-0-β-D-galactopyranosyl-6-0-α-L-rhamnopyranosyl]-β-D-glucopyranoside and 3-0-[2-0-β-D-xylopyranosyl-6-0-α-L-rhamnopyranosyl]-β-D-glucopyranoside. Moreover, compared with the conventional extraction method, SFE consumed less organic solvent and shorter time.
     However, the two kaempferol glycosides had no effects on the activities of complex I and ATP synthase from Escherichia coli in high concentration. More works on their bioactivities are needed.
引文
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