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Waste utilization and optimization of calamansi peels: a formulation study on biodegradable microbeads
Summary
Tiny plastic beads used as exfoliants in cosmetics are a direct source of microplastic pollution — and this Philippine study developed a biodegradable alternative made from the cellulose in calamansi citrus peel waste. The resulting beads matched industry size standards for exfoliants and performed well in both hand sanitizer and facial gel formulations, with good stability and texture. The work demonstrates a circular-economy approach: converting agricultural food waste into an eco-friendly substitute for synthetic microplastics in personal care products.
One environmental challenge posed by agricultural waste in the Philippines can be mitigated by converting fruit peel waste into valuable cellulose-derived microbeads. Utilizing the ionic gelation technique, this study introduces a sustainable, “waste-to-value” innovation designed to replace synthetic microplastics in the cosmetic industry. The resulting microbeads are characterized by a yellowish-green, spherical morphology with a standardized particle size of 850 micrometers, well within the functional limit for exfoliants, and an excellent flowability rating indicated by a 26.55° angle of repose. When incorporated into formulations, the microbeads maintained high structural stability; the resulting hand sanitizer had a pH of 3.55, while the facial gel exfoliant had a pH of 7.6, demonstrating excellent homogeneity and foam stability. By successfully validating these bio-based alternatives, the study highlights a circular-economy approach that mitigates food-processing waste while providing eco-friendly, high-performance materials for the global personal care sector.