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Finally, to apply the alanine to these kind of surfaces, a voltammetric titration was conducted with a constant concentration of Ru3+/2+ (10mM) and different concentrations of d(+)Ala and l(−Ala. The linear behavior observed in all the curves presented suggests that passivation effects on the electrode surfaces studied are essentially absent in the Ala concentration range explored. In addition, improved detection and quantification limits (D.L. = 3/m and Q.L. = 10/m, respectively, where  is the standard deviation of the data points and m is the slope of the linear relationship) [12] can be attained using the modified surfaces. The enantioselective recognition was evident with the highest D.L. and Q.L. in the presence of d(+)Ala¨Cl(−Ala and vice versa. This is corroborated in Table 1 which shows that the recognition was practically the same. The use of these materials is a potentially important new source of materials for electroanalytical applications. 4. Conclusions This work demonstrates a new kind of enantioselective surface based on dendrimers and amino acids as alanine. These were characterized by cyclic voltammetry in the presence of ferrocene monocarboxylate and hexamine ruthenium as probe molecules. From the voltammetric response the enantioselective recognition was evaluated by assessing the blocking of the charger transfer of probe molecules. The resulting decrease of current in the electrochemical signal demonstrated the importance of nanosized chiral spaces on the enantioselective site. Although therewas not a significant difference in the slope of the calibration curves, this is the first report about the modification of the dendrimer Ala to be used on enantioselective surfaces of aminoacids [ Last edited by qingshaojun0823 on 2009-10-27 at 08:44 ]

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