| 题名: | More healthy teas innovatively treated utilizing gold nanoparticles |
| 作者: | Tsai, Teh-Hua
Lin, Su-Yi
Yang, Kuang-Hsuan
Yang, Chih-Ping
Liu, Yu-Chuan |
| 贡献者: | 生活應用科學系 |
| 关键词: | ENHANCED RAMAN-SCATTERING
SELF-ASSEMBLED MONOLAYERS
SIZE
CHITOSAN
ACID
IMMOBILIZATION
NANOSTRUCTURES
NANOCOMPOSITES
ANTIOXIDANT
PROTEINS |
| 日期: | 2014 |
| 上传时间: | 2015-01-27 15:09:17 (UTC+8) |
| 摘要: | As observed from the literature, not much effort is made on increasing the content of healthy components of total polyphenols in teas by using post-treatment technologies based on nanoparticles (NPs). In this work, we report a new strategy on the green preparation of Au NPs from bulk Au sheets by employing a thermal reduction method in a solution containing chitosan (Ch) and trisodium citrate. The synthesized Au NPs are innovatively applicable for treating commercial teas at room and elevated temperatures for increasing the contents of their healthy components. Encouragingly, the content of the total polyphenols in the treated teas, including less oxidized oolong tea and fully oxidized black tea, can be significantly increased by ca. 100% and 30%, respectively, compared to corresponding untreated teas. In addition, the ability to scavenge free hydroxyl radicals for oolong tea can be enhanced by ca. 20% after the Au NPs-treatment. These results suggest that this alternative approach based on prepared Au NPs promises the availability of healthier teas. |
| 關聯: | RSC ADVANCES 卷: 4 期: 73 頁碼: 38599-38605 |
| 显示于类别: | [Department of Applied Science of Living & Graduate Institute of Applied Science of Living ] journal articles
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