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Physicochemical investigation of cellulose microbeads produced through cross-flow membrane emulsification for cosmetic applications
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Researchers produced biodegradable cellulose microbeads with a median diameter of roughly 7 μm using cross-flow membrane emulsification, then surface-modified them with silane to tune their properties, achieving robust mechanical performance suitable for cosmetic applications. This work offers a scalable, biodegradable substitute for the synthetic plastic microbeads still used in personal care products, directly targeting one of the most direct routes for microplastics entering aquatic environments via wastewater.
Microbeads have become an indispensable part of our daily lives, especially in the cosmetic industry. However, microbeads fabricated from commercial polymers are not biodegradable and have harmful environmental impacts. As one of the most abundant biopolymers, cellulose has attracted increasing attention as a biodegradable material. Hence, we investigated a facile method for fabricating cellulose microbeads via cross-flow membrane emulsification, which could facilitate high-volume production, to provide a sustainable alternative to conventional microplastics. This study successfully produced cellulose microbeads through cross-flow membrane emulsification and comprehensively analyzed their physical and chemical properties to enhance their potential for diverse applications, including the cosmetic industry. Cellulose microbeads with a median diameter of 6.97 μm were fabricated using cross-flow membrane emulsification and further modified with octadecyltriethoxysilane (ODTES) to tailor their properties for specific applications. The transformation of cellulose acetate into cellulose was achieved through deacetylation, as confirmed by comprehensive morphological and chemical analyses. The cellulose microbeads exhibited a neutral pH (close to 7) regardless of the type and demonstrated mechanical robustness with a compressive strength of 5.75 MPa for the cellulose microbeads and 8.22 MPa for the ODTES-modified cellulose microbeads. These findings demonstrate the potential of cellulose beads as an environmentally friendly alternative to plastic microbeads, aligning with global sustainability initiatives and opening new possibilities for innovation in cosmetic formulations.
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Researchers fabricated biodegradable cellulose microbeads reinforced with triazine-based covalent organic nanosheets via electrospray, achieving compressive strength (238 MPa) exceeding conventional polypropylene microbeads (199 MPa). This provides a viable sustainable alternative to petroleum-based plastic microbeads used in cosmetics and personal care products—a primary source of intentionally introduced microplastic pollution.
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Researchers used life cycle assessment to compare environmental impacts of potential alternatives to plastic microbeads in rinse-off cosmetics, finding that while some substitutes offer genuine benefits, others could introduce new environmental and human health risks that may offset the gains from microbead bans.
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Researchers produced biodegradable microbeads from non-derivatized cellulose and kraft lignin blends with tunable size and stiffness comparable to commercial plastic microbeads, without chemical crosslinking, and demonstrated mechanical stability over two months. These biomass-derived microbeads represent a viable plastic-free alternative for personal care products, directly addressing the microplastic pollution caused by synthetic microbeads that pass through wastewater treatment and accumulate in aquatic environments.
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Researchers reviewed how microplastic beads are widely used in cosmetics and pharmaceuticals, warning that these particles can take decades to break down in the environment and pose growing risks to ecosystems and potentially human health through ongoing exposure.
Alginate microbead to mitigate microplastic pollution
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Researchers developed alginate microbeads from brown algae as a biodegradable alternative to synthetic plastic microbeads in cosmetic and pharmaceutical products, encapsulating tea tree essential oil using ionotropic gelation and finding that calcium chloride crosslinking without surfactant produced optimal gel strength and encapsulation efficiency while lifecycle analysis confirmed substantially lower environmental impact than conventional plastic microcapsules.
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