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幫忙翻譯2個(gè)英文摘要，謝謝！
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一． Methacrylate-based monolithic columns with electroosmotic flow (EOF) or very weak EOF are prepared by in situ copolymerization in the presence of a porogen in fused-silica capillaries pretreated with a bifunctional reagent. Satisfactory separations of acidic and basic compounds on the column with EOF at either low or high pH are achieved, respectively. With sulfonic groups as dissociation functionalities, sufficient EOF mobility still remains as high as 1.74×10−4 cm2 s−1 V−1 at low pH. Under this condition, seven acidic compounds are readily separated within 5.7 min. Moreover, at high pH, the peak shape of basic compounds is satisfactory without addition of any masking amines into running mobile phase since the secondary interaction between the basic compounds and the monolithic stationary phase are minimized at high pH. Reversed-phase mechanism for both acidic and basic compounds is observed under investigated separation conditions. In addition, possibilities of acidic and basic compound separations on a monolithic column with extremely low EOF are discussed. Keywords: Electrochromatography; Monolithic columns; Stationary phases, electrochromatography 二． In summary, we take advantage of the color change of gold nanoparticles induced by hydrogen-bonding recognition to develop a novel nanoparticle sensor for visual detection of melamine. This new method offers several advantages over current melaminedetection techniques. First, the method does not require expensive and complicated instruments, which simplifies operations and reduces the cost. Second, the method allows a detection concentration as low as 2.5 ppb to be achieved with the naked eye within 1 min, useful for rapid and ultrasensitive detection of melamine in milk products. Finally, this sensor exhibits excellent selectivity for melamine over other molecules with similar structures and the residual ingredient in the extract from raw milk and commercially available infant formula. These advantages substantially make this method quite promising for on-site and real-time detection of melamine in raw milk, infant formula, and other milk products |
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