3 years ago

Physicochemical, mechanical, barrier and antibacterial properties of starch nanocomposites crosslinked with pre-oxidised sucrose

Preetha Balakrishnan, M.s. Sreekala, V.g. Geethamma, Nandakumar Kalarikkal, Vanja Kokol, Tatiana Volova, Sabu Thomas

Publication date: April 2019

Source: Industrial Crops and Products, Volume 130

Author(s): Preetha Balakrishnan, M.S. Sreekala, V.G. Geethamma, Nandakumar Kalarikkal, Vanja Kokol, Tatiana Volova, Sabu Thomas

Abstract

Bionanocomposite films were fabricated using starch as a matrix, pre-oxidised sucrose as a crosslinker and cellulose nanofibres as reinforcement filler. The spectroscopic (FTIR) and microscopic (SEM) techniques were used to identify the chemical changes associated with the crosslinking, and to characterize the morphological structure of the films. The crosslinking density evaluated by Flory-Rehnar equation. There is a decrease in diffusivity, permittivity and swelling properties of the films after crosslinking. Reduction of water vapour (from 0.074 to 0.038 g min−1 m-2) and oxygen (from 29.44 to 10.27 cm3 m-2 d−1) transmission rates for film prepared with 3 wt.% of OS and 5 wt.% of CNFs was observed. The water transport through the films was found to follow Fickian behaviour. The anti bacterial properties of films against four different food pathogens were evaluated. Films represent high potential alternative to existing ones.

Graphical abstract

Synopsis: Flexible and bio based starch nanocomposite films crosslinked with bio-based disaccharide derivative for packaging applications.

Graphical abstract for this article

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