Table of Contents
Journal of Applied Chemistry
Volume 2014, Article ID 162480, 9 pages
http://dx.doi.org/10.1155/2014/162480
Research Article

Characterization of Native and Modified Starches by Potentiometric Titration

Laboratorio de Polímeros y Reacciones, Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad del Zulia, Sector Grano de Oro, Avenida 16 (Guajira), Ciudad Universitaria Dr. Antonio Borjas Romero, Edificio Petróleo y Química, Maracaibo 4011, Venezuela

Received 1 September 2014; Revised 10 November 2014; Accepted 18 November 2014; Published 3 December 2014

Academic Editor: Parsotam H. Parsania

Copyright © 2014 Diana Soto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The use of potentiometric titration for the analysis and characterization of native and modified starches is highlighted. The polyelectrolytic behavior of oxidized starches (thermal and thermal-chemical oxidation), a graft copolymer of itaconic acid (IA) onto starch, and starch esters (mono- and diester itaconate) was compared with the behavior of native starch, the homopolymer, and the acid employed as a graft monomer and substituent. Starch esters showed higher percentages of acidity, followed by graft copolymer of itaconic acid and finally oxidized starches. Analytical techniques and synthesis of modified starches were also described.