Sustainable active film from chitosan (CS) incorporated with microalgae
Haematococcus pluvialis extract (HPE) was developed. Pulsed electric
field (PEF) with the field strength of 25 kV∙cm -1 and total
specific energy of 200 kJ∙kg -1 was optimal to extract
H. pluvialis
by inducing the electroporation in the cytoplasmic membrane, resulting in
improving the solvent-mediated extraction of the bioactive compounds, as
evident by the analysis results of GC-MS and HPLC-MS. The active film was
then fabricated by infusing CS with HPE or PEF-assisted HPE (PEF-HPE), and
characterized for tensile strength, elongation, opacity, water vapor barrier
and antioxidant activity. The optimal CS+PEF-HPE film was then used to wrap
chicken fillet, in comparison to CS and CS+HPE. Chicken meat without film
wrapping was used as control. All samples were stored at 4 °C and monitored
for changes in color, total volatile basic nitrogen (TVB-N), trimethylamine
(TMA), total viable counts (TVC) throughout the storage. Chicken breast
wrapped with CS, CS+HPE and CS+PEF-HPE had significantly lower TVB-N, TMA,
TVC than control samples during storage. The food preserving capability of
the fabricated films increased in ascending order from CS, CS+HPE, to
CS+PEF-HPE. These results indicated the fabricated CS film synergized with
microalgae extract has potential as active packaging to preserve quality and
extend shelf-life of chicken meat.