Obtenção e caracterização de filmes biodegradáveis de amido de mandioca com hidrolisados de celulose bacteriana

Abstract

This work aimed to prepare and to characterize cassava starch biodegradable films with bacterial cellulose hydrolysate partially purified. So, the casting method was used to prepare films added with citric acid and glycerol, and different amounts of bacterial cellulose hydrolysate partially purified. For the hydrolysis, two different acids were tested, hydrochloric acid and sulphuric acid. The films obtained were characterized by thickness, grammage, humidity, water solubility and mechanical tensile test. The results suggest that the type of acid used to obtain the bacterial cellulose hidrolysate partially purified influences solubility and possibly their chemical and molecular characteristics, affecting consequentially the film characteristics. The results showed that the bacterial cellulose hidrolysate partially purified has potential to improve the mechanical characteristics of films, since there was an increase in the tensile strength, elongation and Young's modulus of some films compared with control films, without bacterial cellulose hydrolysate.