搜索结果: 1-7 共查到“食品科学技术 DPPH”相关记录7条 . 查询时间(0.125 秒)
复叶耳蕨渣总黄酮转化提取与DPPH自由基清除活性的研究
复叶耳蕨 土壤真菌 固体发酵 DPPH自由基清除
2016/6/27
究复叶耳蕨渣的 土 壤真菌发酵转化提取其总黄酮和清除 DPPH 自由基活性 。 复叶耳蕨渣直筛发酵用优势
菌株 ; 通过单因素和正交实验 L9 (3#) 优化总黄酮提取 ， DPPH 法评价转化前后总黄酮抗氧化活性 。 研究得到优势菌株
F& 发酵复叶耳蕨渣后黄酮得率为 （ 0.893% ±0.035% ) ， 较未发酵时总黄酮得率提高了 27.0% ， 差异显著 。 F2 发酵复叶
耳蕨渣...
不同二氢杨梅素含量的显齿蛇葡萄提取物的抗菌活性与清除DPPH自由基能力研究
显齿蛇葡萄提取物 二氢杨梅素 抗菌活性 清除DPPH
2016/12/24
研究不同二氢杨梅素含量的显齿蛇葡萄提取物的抗菌活性与清除DPPH自由基能力。选取17种二氢杨梅素 含量不同的显齿蛇葡萄，使用乙醇超声辅助法获得各个样品的提取物；采用药敏滤纸片法和二苯代苦味酰基自由基 (DPPH.)体系分别研究提取物以及相同含量的二氢杨梅素纯品的抗菌活性和清除DPPH自由基能力。结果表明：17 种提取物的抗菌活11■生和清除DPPH自由基能力随着提取物中二氢杨梅素含量的增加而增强，...
Effect of cooking methods on total phenolic and carotenoid amounts and DPPH radical scavenging activity of fresh and frozen sweet corn (Zea mays) kernels
Zea mays L. cooking process phenolics β-carotene antioxidan
2014/2/24
We evaluated the effect of three different cooking methods on antioxidant content and radical scavenging activity of sweet corn. Both fresh and frozen sweet corn kernels were boiled, microwaved, and s...
DPPH Radical-Scavenging Activity and Polyphenol Content in Dried Fruits
dried fruits fresh fruits ascorbic acid
2009/6/18
The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging activity and polyphenol content of 25 dried fruits were evaluated and compared with fresh fruits. The contribution of ascorbic acid to this ...
Evaluation of DPPH-Radical-Scavenging Activity and Antimutagenicity and Analysis of Anthocyanins in an Alcoholic Fermented Beverage Produced from Cooked or Raw Purple-Fleshed Sweet Potato（Ipomoea Batatas cv. Ayamurasaki）Roots
purple-fleshed sweet potato anthocyanin alcoholic beverage
2009/6/10
We investigated the 1,1-diphenyl-2-picrylhydrazyl (DPPH)-radical-scavenging activity and antimutagenicity of alcoholic fermented beverages produced from cooked or raw purple-fleshed sweet potato (Ipom...
Effects of Extracts from Tropical Seaweeds on DPPH Radicals and Caco-2 Cells Treated with Hydrogen Peroxide
Seaweed ethanol extract acetone extract
2009/5/20
Edible seaweeds were collected from Indonesia, a tropical country that does not show seasonal variations in temperature, to evaluate their health-related activities. Ethanol and acetone extracts were ...
Development and Validation of a Microplate-based β-carotene Bleaching Assay and Comparison of Antioxidant Activity (AOA) in Several Crops Measured by β-carotene Bleaching, DPPH and ORAC Assays
AOA β-carotene bleaching assay DPPH assay ORAC assay Trolox plate reader tocopherol
2010/3/5
The reproducibility and reliability of the micro-β-carotene-linoleic acid bleaching (BCB) assay have been improved, enabling comparison to the antioxidant activity (AOA) of extracts from eleven kinds ...