Characterization of a biocomposite film using coconut jelly powder to improve arrowroot starch and sodium alginate film forming properties.

Composite polymers are promising solution to structural setbacks of starch and alginate-based films due to their hydrophilic attributes. Hence, this study aimed to investigate young coconut jelly powder (CJP), an under-utilized by-waste, as a filler using the casting method to develop a novel biocomposite from increments of CJP (1-3 %) to a blended resin of arrowroot starch, sodium alginate, and glycerol. Moreover, the films were characterized by physicomechanical (visual aspect, thickness, color, moisture content, tensile strength, and elongation at break); surface microstructure; water barrier (water vapor permeability, water solubility, and water activities); thermal, crystallinity, and functional group properties; soil, river water, and seawater biodegradability; and coating application in cherry tomato. The results showed CJP improved tensile strength from 1.84 to 9.35 MPa and lowered moisture content from 33.44 to 18.92 %, and revealed compatibility within a semi-crystalline film matrix of high thermal stability, which depicted smooth surface areas and opacity suitable for packaging. The findings demonstrated faster biodegradability rates in soils (14-35 days) than water tests (152-180 days). Furthermore, coating significantly delayed weight loss while preserving visible color and flesh quality of the cherry tomato. In conclusion, the CJP-based biocomposite films presented a potential biodegradable eco-friendly alternative to the food packaging industry.