Tailoring the surface properties and flexibility of starch-based films using oil and waxes recovered from potato chips byproducts

abstract

Agrofood byproducts may be exploited as a source of biomolecules suitable for developing bioplastic materials. In this work, the feasibility of using starch, oil, and waxes recovered from potato chips byproducts for films production was studied. The recovered potato starch-rich fraction (RPS) contained an amylopectin/amylose ratio of 2.3, gelatinization temperatures varying from 59 to 71 degrees C, and a gelatinization enthalpy of 12.5 J/g, similarly to a commercial potato starch (CPS). Despite of its spherical and oval granules identical to CPS, RPS had a more amorphous structure and gave rise to low viscous suspensions, contradicting the typical B-type polymorph crystal structure and sluggish dispersions of CPS, respectively. When used for films production, RPS originated transparent films with lower roughness and wettability than CPS-based films, but with higher stretchability. In turn, when combined with RPS and CPS, oil or waxes recovered from frying residues and potato peels, respectively, allowed to develop transparent yellowish RPS- and CPS-based films with increased surface hydrophobicity, mechanical traction resistance, elasticity, and/or plasticity. Therefore, potato chips industry byproducts revealed to have thermoplastic and hydrophobic biomolecules that can be used to efficiently develop biobased plastics with improved surface properties and flexibility, opening an opportunity for their valorization. (C) 2020 Elsevier B.V. All rights reserved.

keywords

PHYSICOCHEMICAL PROPERTIES; MECHANICAL-PROPERTIES; WATER-VAPOR; BLEND FILMS; BEHAVIOR; BARRIER; FOOD; HYDROPHOBICITY; GLYCEROL; FEED

subject category

Biochemistry & Molecular Biology; Chemistry; Polymer Science

authors

Goncalves, I; Lopes, J; Barra, A; Hernandez, D; Nunes, C; Kapusniak, K; Kapusniak, J; Evtyugin, DV; da Silva, JAL; Ferreira, P; Coimbra, MA

Groups

G2 - Photonic, Electronic and Magnetic Materials
G4 - Renewable Materials and Circular Economy

Projects

Desenvolvimento de um composto bioplástico biodegradável à base dos subprodutos de batata (POTATOPLASTIC)

Projeto de Investigação Exploratória: Paula Ferreira (IF_Paula Ferreira)

acknowledgements

Thanks are due to the University of Aveiro and FCT/MCTES for the financial support of QOPNA research Unit (FCT Ref. UID/QUI/00062/2019) and of CICECO-Aveiro Institute of Materials (FCT Ref. UIDB/50011/2020 & UIDP/50011/2020). The authors acknowledge to POTATOPLASTIC project (POCI-01-0247-FEDER-017938), financed by FEDER through POCI, Isolago - Industria de Plasticos, S.A., the project leader, and to A Saloinha, Lda. for providing potato byproducts. The costs resulting from the FCT hiring is funded by national funds (OE), through FCT - Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5 and 6 of the article 23, of the Decree-Law 57/2016, of August 29, changed by Law 57/2017, of July 19. FCT is also thanked for the Investigator FCT program (PF, IF/00300/2015), for the Individual Call to Scientific Employment Stimulus (IG, CEECIND/00430/2017), and for the grants ref. SFRH/BPD/104712/2014 (IG), SFRH/BD/136804/2018 (JL), and SFRH/BPD/100627/2014 (CN).