329 - Investigation on the electrochemical properties of catecholmines and melanins |
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| Affiliation: | 1. Facultad de Ciencias Biológicas, Universidad Central del Ecuador, Quito 170403, Ecuador;2. Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14049-900, Brazil;3. Facultad de Ingeniería Química, Universidad Central del Ecuador, Quito 170521, Ecuador;4. Facultad de Medicina, Universidad Central del Ecuador, Quito 170403, Ecuador;5. Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14050-901, Brazil |
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| Abstract: | The melanization process was investigated using electrochemical methods.On the a.c. and multisweep curves the particular stages occur as separated, consecutively rising and decreasing peaks, corresponding to gradual association of precursor molecules.An interesting effect is the rise of d.c. waves at potentials characteristic for H2O2 (appearing usually if O2 is present in the solution) in deoxygenated solutions of melanins. The differences in the curves of catechol-melanin and indole-melanin permit to ditinguish these compounds using polarographic methods.The result of practical importance is the possibility of a fast determination of small amounts of adrenaline and noradrenaline by use of multisweep methods. |
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