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fjtcm8772金蟲 (小有名氣)
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[交流]
【求助】鄰苯三酚自氧化法測定抗氧化活性問題 已有23人參與
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我的試驗方案: Superoxide radicals were generated by pyrogallic acid method (Meng et al., 2005),and the method was innovated slightly. The system contained 4.5 ml of Tris–HCl buffer (0.05 mol, pH 8.2), 1 ml of sample solution, 0.4 ml of pyrogallic acid(3.0 mmol), and 0.5 ml of thick hydrochloric acid for termination the reaction. Thesolution was incubated at 25℃and determined at 299 nm. In blank, sample solution was substituted with Tris–HCl buffer. The antioxidant activity of the sample was evaluated according to the following formula: Scavenging rate E% = (1 - A/A0) *100%, where A was the absorbance of the test sample, and A0 was absorbance of the blank. 但是陽性對照物VC在50ug/ml時的清除率才為52%,與文獻(xiàn)上差很多。。另一陽性對照物BHT則隨著濃度的增加清除率反而下降,難道BHT不能清除超氧陰離子,反而促進(jìn)超氧陰離子的生成? 請問大家有遇到這種情況嗎?還是這個方案有錯。。。如果大家有鄰苯三酚自氧化法測定抗氧化活性的其他方案,效果和重復(fù)性還不錯的話,請大家告訴我。。 |
生工檢測理論與實務(wù) |
金蟲 (正式寫手)
金蟲 (小有名氣)
鐵蟲 (初入文壇)
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