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Int J Biol Macromol. 2018 Aug;115:955-960. doi: 10.1016/j.ijbiomac.2018.04.162. Epub 2018 May 1.

Valorisation of blueberry waste and use of compression to manufacture sustainable starch films with enhanced properties.

Author information

1
Department of Chemical Engineering, Federal University of Rio Grande do Sul (UFRGS), Rua Ramiro Barcelos, 2777, Anexo I Campus Saúde, ZC: 90035-007 Porto Alegre, RS, Brazil.
2
BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain.
3
BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain. Electronic address: koro.delacaba@ehu.eus.

Abstract

Blueberry waste from juice processing was valorised to develop starch films by compression moulding. The compression process resulted in hydrophobic films with water contact angles even higher than 100° for the films prepared with the highest blueberry waste content. Additionally, the film solubility was reduced by the incorporation of blueberry waste, regardless of the solution pH. These films also exhibited good barrier properties against UV light due to the aromatic compounds present in the blueberry waste. Furthermore, films showed a homogenous surface, although some pores appeared in the cross-section for the films with the highest blueberry waste content. Results highlighted the use of thermo-mechanical processes such as compression to manufacture sustainable films with enhanced properties through waste valorisation by the techniques actually employed at industrial scale.

KEYWORDS:

Blueberry waste; Starch; Sustainable film

PMID:
29727647
DOI:
10.1016/j.ijbiomac.2018.04.162
[Indexed for MEDLINE]

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