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Food Chem. 2017 Dec 1;236:120-126. doi: 10.1016/j.foodchem.2017.03.094. Epub 2017 Mar 18.

Impact of the homogenization process on the structure and antioxidant properties of chitosan-lignin composite films.

Author information

1
Univ. Bourgogne Franche-Comté, Agrosup Dijon, UMR PAM A 02.102, 21000 Dijon, France.
2
School of Agro-Industry, Mae Fah Luang University, 57100 Chiang Rai, Thailand.
3
UMR Ingénierie Procédés Aliments, INRA, AgroParisTech, Université Paris-Saclay, 91300 Massy, France.
4
Univ. Bourgogne Franche-Comté, Agrosup Dijon, UMR PAM A 02.102, 21000 Dijon, France; IUT Dijon-Auxerre, Dpt Bioengineering, BP 17867, 21078 Dijon, France.
5
Univ. Bourgogne Franche-Comté, Agrosup Dijon, UMR PAM A 02.102, 21000 Dijon, France. Electronic address: thomas.karbowiak@u-bourgogne.fr.

Abstract

This work investigated the impact of two homogenization treatments, High Shear (HS) and High Pressure (HP), on the structure and antioxidant activity of chitosan-lignin bio-composite films. Laser light scattering analysis revealed that smaller lignin particles were obtained after HP processing, around 0.6μm, compared to HS treatment, between 2.5 and 5μm. Moreover, these particles were more homogeneously distributed in the chitosan film matrix after HP process, while some aggregates remained after HS treatment, as highlighted by two-photon microscopy. The surface hydrophobicity of the composite films, as measured by water contact angle, increased after the two homogenization treatments. Finally, the antioxidant activity of the composite films was determined using the DPPH· assay. No significant difference in the radical scavenging activity was noticeable, neither after HS nor HP processing. However, a migration of lignin residues from the film to the extraction medium was noticed, particularly for HP process.

KEYWORDS:

Active packaging; Antioxidant; High pressure processing; Renewable resources; Sustainable material

PMID:
28624080
DOI:
10.1016/j.foodchem.2017.03.094
[Indexed for MEDLINE]

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