Self-Standing Lignin-Containing Willow Bark Nanocellulose Films for Oxygen Blocking and UV Shielding

Developing the bio-based barrier material to substitute petroleum-based one is trend in functional packaging applications. Utilization of abundantly underappreciated bark biomass attractive from sustainability point view; however, an upgraded approach required maximize performances lignin-containing cellulose nanofibril (LCNF) films willow bark. Herein, hot water extraction (HWE) and microfluidization were studied for their effect on yield LCNF its film performance after treatment aqueous p-toluenesulfonic acid. The resultant HWE superior nontreated ones regarding yield, moisture, oxygen properties. In particular, achieved permeability 3 cm3·?m/m2·kPa·day at 50% relative humidity, which among lowest single materials comparable commercially available synthetic films. attained complete blocking UV light transmission within wavelength range 290–400 nm. Overall, this study shows that pretreatment not only allows recovery high-value extracts, but also significantly improves performances. biocompatible, lignin-containing, self-standing hydrophobic nanocellulose show promise as a layer against radiation permeation food other