作者
Zhimin Tao, Gang Wang, Jerry Goodisman, Tewodros Asefa
发表日期
2009/9/1
期刊
Langmuir
卷号
25
期号
17
页码范围
10183-10188
出版商
American Chemical Society
简介
We have measured the influence of mesoporous silica (MCM-41 and SBA-15) nanoparticles and dense silica nanoparticles on epinephrine oxidation, a pH-dependent reaction, whose rate is small in acidic or neutral solutions but much greater at higher pH. The reaction was measured by monitoring adrenochrome at 480 nm, the product of epinephrine oxidation. In distilled water (dH2O) with no particles present, the oxidation of epinephrine occurs slowly but more rapidly at higher pH. The presence of MCM-41 or silica spheres does not accelerate the oxidation, but SBA-15 does, showing that the difference in the structures of nanomaterials leads to differing effects on the epinephrine oxidative process. In phosphate buffered saline (PBS, pH = 7.4), epinephrine undergoes a much quicker oxidation, and, in this case, the presence of SBA-15 and MCM-41 makes it even more rapid. Silica spheres have no noticeable …
学术搜索中的文章
Z Tao, G Wang, J Goodisman, T Asefa - Langmuir, 2009