Protein extracted from castor bean (Ricinus communis L.) cake in high pH results in films with improved physical properties

Author(s)

Chambi, Hulda N. M. ^[1] ; Lacerda, Roseli S. ^[2] ; Makishi, Gisele L. A. ^[3] ; Bittante, Ana Monica Q. B. ^[3] ; Gomide, Catarina A. ^[2] ; Sobral, Paulo J. A. ^[3]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Fac Food Engn, Dept Food Technol, BR-13038862 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Anim Sci, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Sao Paulo, Fac Anim Sci & Food Engn, Dept Food Engn, BR-13635900 Pirassununga, SP - Brazil

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 61, p. 217-224, NOV 2014.
• Web of Science Citations: 4

Abstract

Castor bean plant (Ricinus communis L.) is a very important crop worldwide because it can be produced under severe climate conditions. Also, it gained importance last year because of the increasing industrial demand of biodiesel. The objective of this study was to study the effect of the pH (10, 11 and 12) of extraction of proteins from castor bean cake on some physical properties of films based on these proteins modified by tannin. Increasing pH improved the protein extraction yield without affecting their amino acid profile. The films prepared using these proteins by casting process showed a structural matrix sufficiently cohesive, intense total color difference (Delta E{*} = 83-85) and relatively high opacity (8-15%). The values of tensile strength, elongation at break, Young Modulus, water vapor permeability and hydrophobicity of films were affected by the protein extraction pH. The protein extraction in pH = 12 resulted in more rigid, more resistant, with enhanced extensibility, a lower rate of water diffusion and less hydrophilic films. The films showed homogeneous surfaces and dense internal microstructure. FTIR spectra of all films showed characteristic bands and peaks typical of proteins with no differences in positions and intensity due to pH variations. It is possible to produce films from proteins extracted from castor bean cake by casting process. These films may be used in agriculture, specifically for planting seedlings. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 09/10172-8 - Development of biodegradables materials from castor protein modified by tannins and reinforced with vegetal fibers.
• Grantee: Hulda Noemi Chambi Mamani
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 08/11341-5 - Development of biodegradable material based on Castor (Ricinus communis L.) cake, a by-product of the bio-diesel agroindustrial chain
• Grantee: Paulo José do Amaral Sobral
• Support Opportunities: Regular Research Grants