Resumo

MOLINA, Pamela; ENCALADA, Katherine  e  VALLE, Vladimir. Preliminary Evaluation of the Effect of FeSO4·7H2O and CuSO4·5H2O Over the Oxidation of Achira Starch (Canna edulis) with Hydrogen Peroxide. Rev Politéc. (Quito) [online]. 2017, vol.39, n.2, pp.67-72. ISSN 2477-8990.

There is a great diversity of oxidizing agents that can modify starches; however, the influence of the catalysts on the degree of oxidation is still in research, so the current work pretends to study the effect of FeSO4·7H2O and CuSO4·5H2O on the oxidation of achira starch (Canna edulis) with hydrogen peroxide. To aim this goal, the starch was chemically modified with 1 %, 2 % and 4 % of the oxidizing agent at different proportions of the mentioned catalysts. The quantitative evaluation of the oxidation was performed by Fourier transform infrared spectroscopy and titration. The results shown that the use of FeSO4·7H2O and CuSO4·5H2O in equal proportions, at 2% of oxidant, promotes a greater number of carboxyl groups in comparison with the exclusive action of H2O2; in this way, the catalytic action of the sulfates studied is verified.

Palavras-chave : Starch; Chemical Modification; Oxidation; Hydrogen Peroxide.

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