Self-assembly of coconut residue fiber with chitosan: Effect of three pre-treatments on the self-assembly process and bile salt adsorption.

• Microrheology monitored the particle motion type during Self-assembly of CRF. • BS adsorption of IDF correlated with the transient network. • The transient network was composed of CRF, chitosan and BS. • The formation of transient network was through non-covalent weak interactions. Self-assembly with chitosan is a promising method for improving bile salt (BS) adsorption by coconut residue fiber (CRF). To study the self-assembly process, three pre-treatments were performed and investigated using microrheological analysis. The effects of the pretreatments on the self-assembly of CRF and the BS adsorption were evaluated. During self-assembly, CRFs underwent Brownian-like motion, and the addition of chitosan facilitated the formation of inter-particle interactions between CRFs in the system. These interactions were small in extent, large in number, and slow to state change, in addition to relatively high strength and longer maintenance, all of which contributed to the binding to BS. The conventional pretreatments failed to effectively improve the BS adsorption of the self-assembled CRFs and weakened the inter-particle interactions in the system. These results suggest that chitosan assists in the adsorption of self-assembled CRF to BS through a combination of H-bonds and other weak intermolecular forces. [ABSTRACT FROM AUTHOR]