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| 1 | Phenolic compounds of green tea: Health benefits and technological application in food显示文摘Green tea has been an important beverage for humans since ancient times, widely consumed and considered to have health benefits by traditional medicine in Asian countries. Green tea phenolic compounds are predominately composed of catechin derivatives, although other compounds such as flavonols and phenolic acids are also present in lower proportion. The bioactivity exerted by these compounds has been associated with reduced risk of severe illnesses such as cancer, cardiovascular and neurodegenerative diseases. Particularly, epigallocatechin gallate has been implicated in alteration mechanisms with protective effect in these diseases as indicated by several studies about the effect of green tea consumption and mechanistic explanation through in vitro and in vivo experiments. The biological activity of green tea phenolic compounds also promotes a protective effect by antioxidant mechanisms in biological and food systems, preventing the oxidative damage by acting over either precursors or reactive species. Extraction of phenolic compounds influences the antioxidant activity and promotes adequate separation from green tea leaves to enhance the yield and/or antioxidant activity. Application of green tea phenolic compounds is of great interest because the antioxidant status of the products is enhanced and provides the product with additional antioxidant activity or reduces the undesirable changes of oxidative reactions while processing or storing food.In this scenario, meat and meat products are greatly influenced by oxidative deterioration and microbial spoilage, leading to reduced shelf life. Green tea extracts rich in phenolic compounds have been applied to increase shelf life with comparable effect to synthetic compounds, commonly used by food industry. Green tea has great importance in general health in technological application, however more studies are necessary to elucidate the impact in pathways related to other diseases and food applications. | Jose Manuel Lorenzo Paulo Eduardo Sichetti Munekata | 2016 | Asian Pacific Journal of Tropical Biomedicine2016，6，8： | 7 |
| 2 | 三华李叶抗氧化活性物质的分离鉴定显示文摘对比研究了三华李果肉、果核及叶乙醇提取物的总酚、总黄酮含量及其抗氧化活性。三华李叶提取物总酚、总黄酮含量最高,分别为14.75 g没食子酸当量/100 g提取物和5.45 g儿茶素当量/100 g提取物,且三华李叶具有最强的DPPH自由基清除能力(IC50值为79.75μg/m L)及氧自由基吸收能力(ORAC值为6521.74μmol trolox equiv/g)。采用柱层析法,从三华李叶中分离得到三个黄酮类化合物,通过核磁共振法(NMR)及电喷雾质谱法(ESI-MS),鉴定为山柰酚-3,7-二-O-α-L-鼠李糖苷,山柰酚-3-O-α-L-鼠李糖苷以及山柰酚-7-O-α-L-鼠李糖苷,三个化合物均为首次从三华李叶中分离得到。其中,山柰酚-7-O-α-L-鼠李糖苷具有最强的DPPH自由基清除能力(IC50为12.93μg/m L)及氧自由基吸收能力(ORAC,8.83μmol trolox equiv/μmol)。山柰酚-3,7-二-O-α-L-鼠李糖苷是三华李叶中含量最多的化合物。因此,三华李叶可作为有效的抗氧化剂用于保健食品。 | 海金萍 赵谋明 林恋竹 董怡 | 2015 | 现代食品科技2015，31，12： | 6 |
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