Abstract
In the skincare field, water-dispersed bacterial cellulose nanofibers synthesized via an oxidation reaction using 2,2,6,6–tetramethyl–1–piperidine–N–oxy radical (TEMPO) as a catalyst are promising bio-based polymers for engineered green materials because of their unique properties when applied to the surface of the skin, such as a high tensile strength, high water-holding capacity, and ability to block harmful substances. However, the conventional method of synthesizing TEMPO-oxidized bacterial cellulose nanofibers (TOCNs) is difficult to scale due to limitations in the centrifuge equipment when treating large amounts of reactant. To address this, we propose a one-pot TOCN synthesis method involving TEMPO immobilized on silica beads that employs simple filtration instead of centrifugation after the oxidation reaction. A comparison of the structural and physical properties of the TOCNs obtained via the proposed and conventional methods found similar properties in each. Therefore, it is anticipated that due to its simplicity, efficiency, and ease of use, the proposed one-pot synthesis method will be employed in production scenarios to prepare production quantities of bio-based polymer nanofibers in various potential industrial applications in the fields of skincare and biomedical research.
Highlights
Human skin plays an essential role in preventing water loss in the body as it provides the outermost layer of protection from the external environment
The SiliaCat-tetramethyl–1–piperidine–N–oxy radical (TEMPO) beads remained on the nylon mesh, while the cellulose nanofiber reagent to determine the amount of free chlorine content
When synthesizing TEMPO-oxidized bacterial cellulose nanofibers (TOCNs), it is necessary to substitute a certain number of carboxyl groups for those dispersed in the aqueous solution, and the reactants used in the oxidation reaction in the final synthesized TOCNs should be removed
Summary
Human skin plays an essential role in preventing water loss in the body as it provides the outermost layer of protection from the external environment. We reported the synthesis of TEMPO-oxidized bacterial cellulose nanofibers suitable for use as bio-based polymers for engineered green materials without sodium bromide, which were confirmed to exhibit unique properties on the skin surface [7]. In this case, the TEMPO-oxidized cellulose nanofibers were obtained conventionally using a centrifugation method for washing or drying.
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