Nanocellulose-Based Capsules with pH Responsiveness for Colon-Targeted Curcumin Delivery

Author(s)

Aguiar, Ana Carolina ; Bianchi, Jhonatan R. O. ; Lopes, Joao Henrique ; Ferreira, Filipe V. ; Lona, Liliane Maria Ferrareso

• Document type: Journal article
• Source: ACS APPLIED NANO MATERIALS; v. 8, n. 4, p. 13-pg., 2025-01-21.

Abstract

Nanocellulose-based materials have been widely used to encapsulate and release drugs due to their biocompatibility, high drug-loading capacity, and controllable release profiles. However, effective administration of hydrophobic drugs remains challenging due to the water-insoluble organic compounds that make up many currently available drugs (e.g., anti-inflammatory or anticancer drugs). Here, we developed a pH-responsive coated bacterial cellulose (BC) capsule loaded with the hydrophobic drug curcumin (Cur) as a proof of concept for delivering targeted hydrophobic drugs to the colon. Cur was encapsulated in the hydrophilic capsule through an osmotic gradient phenomenon and then coated with carboxymethyl chitosan. The coating was carried out by adding calcium chloride, which facilitates the cross-linking of carboxymethyl chitosan, forming a stable protective layer. In vitro release analysis using the gastrointestinal medium revealed that the BC capsule coated with the pH-sensitive polymer carboxymethyl chitosan had a release profile activated by pH 6.8, providing efficient and protecting loads from premature release. In vitro experiments were performed with HT29 cells and showed that capsules loaded with Cur were more toxic to cancer cells. Overall, the proposed scalable, inexpensive, and simple manufacturing method has great potential for advanced biomedical applications including targeted therapy for hydrophobic drug delivery. (AU)

• FAPESP's process: 23/12419-8 - Valorization of cellulose and lignin to produce materials with potential application in the medical and packaging areas
• Grantee: Liliane Maria Ferrareso Lona
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/03247-6 - Investigation of mesoporous nanoparticles from bioactive glasses containing niobium in bone tissue engineering
• Grantee: João Henrique Lopes
• Support Opportunities: Research Grants - Initial Project
• FAPESP's process: 20/07956-6 - Engineered biofabrication of biocellulose microcapsules containing arabinogalactan from biorefinery and cubosomes for colon-targeted delivery of drugs
• Grantee: Filipe Vargas Ferreira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 23/07910-4 - Multi-user Equipment approved in grant 2022/03247-6: Fourier-Transform Infrared Spectroscopy (FTIR)
• Grantee: João Henrique Lopes
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 21/09341-1 - Alternative functional polymeric materials with potential application to the treatment and proliferation of diseases
• Grantee: Liliane Maria Ferrareso Lona
• Support Opportunities: Regular Research Grants
• FAPESP's process: 21/00980-1 - Synthesis of nanocellulose capsules for oral insulin administration
• Grantee: Ana Carolina de Aguiar
• Support Opportunities: Scholarships in Brazil - Master