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茶多酚是茶叶中重要的成分,随着茶多酚应用的开发,其分析方法也在不断地提高和完善。该文在查阅近年来国内外相关文献的基础上,对茶多酚含量的分析测定方法进行了综述,概括介绍了用于测定茶多酚含量的光度法、色谱法、电化学法等化学分析测定方法,以期为今后茶多酚的分析测定研究提供参考。 相似文献
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分子修饰法制备油溶性茶多酚及其抗氧化性能的研究 总被引:4,自引:0,他引:4
采用分子修饰法制备了豆油脂肪酸酐修饰的茶多酚,通过红外光谱对分子修饰的茶多酚进行了结构表征。将修饰后的茶多酚作为油脂的抗氧化剂,添加到豆油中,考察其溶解性及抗氧化性能。结果表明,有机基团修饰的茶多酚具有优良的分散性,可提高豆油的抗氧化性能。在相同浓度时,豆油脂肪酸酐修饰的茶多酚抗氧化活性优于茶多酚和BHT。 相似文献
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天然抗氧剂——茶多酚在食品行业应用前景 总被引:1,自引:0,他引:1
简述了抗氧化剂的发展历史。比较了BHA、BHT、脂溶性茶多酚和茶多酚的抗氧活性。在不久的将来茶多酚作为天然抗氧剂完全可以取代合成抗氧剂。 相似文献
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茶多酚抑制植物病害的机制及应用前景 总被引:1,自引:0,他引:1
茶多酚是植物中最具特征性的次生代谢产物,具有许多潜在的药用价值和生物活性,其中抑菌活性是研究的热点之一。本文综述了近年来茶多酚抑菌作用的研究进展,探讨和展望了茶多酚的抑菌机理和应用前景等,以期为茶多酚抑菌或活性的进一步研究提供理论信息平台。 相似文献
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将不同质量分数的活性成分茶多酚加入到壳聚糖/玉米醇溶蛋白共混膜液中,采用溶剂浇铸法制备得到一种三元共混膜。分析茶多酚对壳聚糖/玉米醇溶蛋白膜液静态和动态流变学特性、粒径分布以及凝胶强度的影响;测定三元共混膜的机械性能和阻隔性能;同时对共混膜进行形貌、红外、晶体学和热力学分析。结果表明:茶多酚与成膜基质之间的交互作用使膜液中产生了高度纠缠网络结构,有利于均匀稳定共混膜的形成;负载适量茶多酚对膜性能具有良好的改善作用,当茶多酚负载量为1%时,膜材料具有最佳的抗拉强度10.966 Mpa;SEM和XRD结果显示茶多酚与壳聚糖、玉米醇溶蛋白之间发生了强烈的相互作用,具有良好的相容性;FT-IR图谱显示茶多酚与成膜基质之间产生了氢键相互作用;通过热力学分析发现负载茶多酚质量分数为0.5%和2%时,共混膜具有较高的热稳定性。 相似文献
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从雷竹叶中提取茶多酚及其红外光谱的研究 总被引:2,自引:0,他引:2
以雷竹叶为原料,按设计的工艺条件,用乙醇提取茶多酚,乙酸乙酯萃取,回收溶剂,大孔树脂精制产物。得到竹叶中的粗茶多酚的含量13.4%,精茶多酚含量为2.60%。以没食子酸为标品、进行提取物及精制茶多酚的红外测试,对其基团归属予以认定,确定产物成分。 相似文献
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冻干茶多酚脂质体的制备及其质量 总被引:1,自引:0,他引:1
目的制备冻干茶多酚脂质体,并进行质量评价。方法采用不同种类及浓度的冻干保护剂制备冻干茶多酚脂质体,检测其包封率和有效粒径,筛选最佳冻干保护剂及其最适浓度,并对冻干茶多酚脂质体的形态、结构、粒径分布、Zeta电位和稳定性等性质进行观察。结果最佳冻干保护剂为15%(w/v)的蔗糖。所制备的冻干茶多酚脂质体再分散性良好;呈圆球形或椭球形,结构为大单室脂质体;有效粒径为(170.4±3.7)nm;Zeta电位为-60.5mV;在4℃条件下稳定性良好。结论已成功制备冻干茶多酚脂质体,其各项质量指标良好。 相似文献
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研究温度、料液比、浸取时间三个因素对信阳毛尖中茶多酚提取率的影响,并设计L9(33)正交试验进行提取工艺优化研究.结果表明:水提取信阳毛尖中茶多酚的最佳工艺条件为A3B1 C1,即温度为95℃,料液比1:25,提取时间20 min,茶多酚提取率为13.99%. 相似文献
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Cui BK Liu S Li SH Wang J Wang QB Li SP Lin XJ 《International journal of molecular sciences》2012,13(5):5571-5583
The purpose of this study was to evaluate the antioxidant nature of tea polyphenol on S180 cells induced liver cancer in mice. In the present study, hepatocellular carcinoma was induced by tumor transplantation of liver in situ. The antitumor activity of tea polyphenol has been determined in vivo in hepatocellular carcinoma mice after treatment of drug (50, 100, 150 mg/kg body weight) by gavage for 20 days. Results showed that a significant increase in serum aspartate transaminase (AST), alkaline phosphatase (ALP), alanine aminotransfere (ALT), malondialdehyde (MDA) level, decrease in serum white blood cells (WBC), serum total protein (TP), albumin (ALB), A/G, tumor necrosis factor-α (TNF-α) and interferon-gamma (IFN-γ), liver reduced glutathione (GSH) levels were observed. In addition, the levels of enzymic and non-enzymic antioxidants were decreased when subjected to S180 cells induction. These altered enzyme levels were ameliorated significantly by administration of tea polyphenol at the concentration of 50, 100, 150 mg/kg body weight in drug-treated animals. These results indicate that the protective effect of tea polyphenol was associated with inhibition of MDA induced by S180 cells and to maintain the antioxidant enzyme levels. 相似文献
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Anna Gramza Santosh Khokhar Shihikura Yoko Anna Gliszczynska‐Swiglo Marzanna Hes Jozef Korczak 《European Journal of Lipid Science and Technology》2006,108(4):351-362
The present study examined the antioxidative activity of water and ethanol extracts of green and black tea leaves against the oxidation of heated sunflower oil and lard. Oxidation was conducted at 110 °C in the Rancimat test. Total polyphenols and catechin contents in tea extracts were measured. The research showed that the total polyphenol content in green and black tea leaves was 205.2 and 148.7 mg/g, respectively. In tea leaves extracts, it ranged between 245.9 mg/g and 837.7 mg/g and depended on the extraction solvent and the kind of tea used (p <0.001). The highest polyphenol content was observed in samples extracted with 95% ethanol, lower contents were found with the use of water. Results showed that the highest antioxidant activity, measured as an induction period, with 1000 ppm green tea ethanol extract, was comparable to á‐tocopherol activity in sunflower oil. In lard, the longest induction period was measured with 500 and 1000 ppm of green tea ethanol extract. Other tea extract concentrations were significantly less active. Statistical analysis of the tea extract antioxidant activity in lipids in the Rancimat test showed an essential influence of the catechin contents. Further statistical analysis also showed an influence of (?)‐epicatechin gallate (ECG), (?)‐epicatechin (EC), and (+)‐catechin (C) contents in the tea extracts on the antioxidant activity in lipids. It was stated that the antioxidant activity was higher in tea extracts containing high levels of ECG, EC, and C. 相似文献
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将微波干燥和热风干燥应用于新鲜金萱茶叶的干燥,在3个不同的微波功率(350 W,470 W,800 W)和4个不同的空气温度(70 ℃,80 ℃,90 ℃,100 ℃)下,研究了干燥参数即微波功率或温度对干燥时间、失水量的影响,同时还考察了茶叶中茶多酚总量和儿茶素含量的变化、干茶叶的复水性。实验得出,与热风干燥相比,微波干燥的时间缩短了76%~95%,而且干燥后的茶叶有很好的复水性,但干燥后茶多酚总量少于热风干燥;同时随着功率增加,微波干燥时间由11 min降为6 min,随着温度升高,热风干燥时间由127 min缩短为45 min。这两种方法的茶叶干燥动力学模型均满足Page’s半经验公式。 相似文献