Almond shell utilization in next-generation biocomposite packaging: A review

Abstract

Background

The profound use of polyethylene-derived packaging materials has generated significant environmental problems with its non-degradability. The necessity of sustainable substitutes has resulted in intensive research on bio-based packaging materials. Almond shells are the byproduct of almond production, either discarded or burned in the almond industry.

Scope and approach

Almond shells have potential food packaging applications that focus on waste reduction and sustainability. This review examines the prospect of almond shells, a cheap agro-industrial waste, as a desirable building block for next-generation biocomposite packaging material. Transitioning to almond shell-based food packaging can emphasize biodegradability, recyclability, and use of renewable resources.

Key findings and conclusions

Almond shells are abundant in lignocellulosic content and improve the mechanical properties, thermal stability, and barrier behavior of biodegradable polymer matrices, hence providing a potential reinforcement of biopolymers like polylactic acid (PLA) and starch composites. Although potentially valuable, processing inefficiency, cost, and regulatory issues deter wide-ranging applicability. Future breakthroughs in nanotechnology, intelligent packaging, and advanced manufacturing processes, including 3D printing for customized and functional biocomposite packaging, can further enhance almond shell-based biocomposites' functionality and commercial potential. There must be a strategic transition towards bio-based packaging, accompanied by policy encouragement and industry cooperation, to mitigate plastic pollution and create a more sustainable packaging sector.