African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12401

Full Length Research Paper

Characterization of cassava starch films plasticized with glycerol and strengthened with nanocellulose from green coconut fibers

Bruna Aparecida Souza Machado
  • Bruna Aparecida Souza Machado
  • Department of Food and Biotechnology, University Center SENAI CIMATEC, Serviço Nacional de Aprendizagem Industrial, Avenue Orlando Gomes, 1845 - Piatã, Salvador - BA, 41650-010, Brazil.
  • Google Scholar
João Henrique de Oliveira Reis
  • João Henrique de Oliveira Reis
  • Graduate Program in Food Science, Faculty of Pharmacy, Universidade Federal da Bahia, Barão de Jeremoabo Street, Ondina, Salvador - BA, 40170-110, Brazil.
  • Google Scholar
Lindaiá Santos Cruz
  • Lindaiá Santos Cruz
  • Graduate Program in Food Science, Faculty of Pharmacy, Universidade Federal da Bahia, Barão de Jeremoabo Street, Ondina, Salvador - BA, 40170-110, Brazil.
  • Google Scholar
Ingrid Lessa Leal
  • Ingrid Lessa Leal
  • Department of Food and Biotechnology, University Center SENAI CIMATEC, Serviço Nacional de Aprendizagem Industrial, Avenue Orlando Gomes, 1845 - Piatã, Salvador - BA, 41650-010, Brazil.
  • Google Scholar
Josiane Dantas Viana Barbosa
  • Josiane Dantas Viana Barbosa
  • Health Institute of Technology, University Center SENAI CIMATEC, Serviço Nacional de Aprendizagem Industrial, Avenue Orlando Gomes, 1845 - Piatã, Salvador - BA, 41650-010, Brazil.
  • Google Scholar
Joyce Batista Azevedo
  • Joyce Batista Azevedo
  • Health Institute of Technology, University Center SENAI CIMATEC, Serviço Nacional de Aprendizagem Industrial, Avenue Orlando Gomes, 1845 - Piatã, Salvador - BA, 41650-010, Brazil.
  • Google Scholar
Janice Izabel Druzian
  • Janice Izabel Druzian
  • Graduate Program in Food Science, Faculty of Pharmacy, Universidade Federal da Bahia, Barão de Jeremoabo Street, Ondina, Salvador - BA, 40170-110, Brazil.
  • Google Scholar


  •  Received: 15 February 2017
  •  Accepted: 22 June 2017
  •  Published: 12 July 2017

Abstract

The aim of this study was to obtain and characterize biodegradable films of cassava starch plasticized with glycerol and reinforced with nanocellulose from coconut fibers. The mechanical and physical-chemical properties of the nano-biocomposites films obtained were evaluated. The method used to investigate the viability of incorporating coconut nanocellulose in films was applied through a statistical design of the response surface of 17 formulations containing three independent variables (starch, glycerol and nanocellulose). The films were prepared through casting technique, and the effect of different concentrations of the ingredients in each formulation was investigated by monitoring the dependent variables. The green coconut fiber was composed of 32% cellulose, 38% lignin and 0.25% hemicellulose resulted in nanocellulose with a length (L)/diameter(D) value of 38.9±4.7 after the acid hydrolysis process (64% H2SO4; 50°C; 10-15 min). The incorporation of nanocellulose resulted in significant changes (p<0.05) in the barrier and mechanical properties. Additionally, there was a significant increase in the Young’s modulus and in the tensile of the nano-biocomposites. Consequently, there was a decrease in the percentage of elongation. Thus, films formulated from cassava starch plasticized with glycerol could have significantly altered mechanical, technical and barrier properties due to the incorporation of coconut nanocellulose.

Key words: Biodegradable packaging, cellulose nanocrystals, nano-biocomposites, coconut fibers.