pH-Dependent interaction mechanism of lignin nanofilms

Abstract

The molecular interaction mechanism of lignin was demonstrated by measuring the adhesion forces using an SFA and monitoring adsorbed mass of lignin with QCM-D. Herein, five different types of self-assembled monolayers (SAMs) were utilized.

Specific interaction between the DSPHTELP peptide and various functional groups

“…The selection of SAMs with distinct terminal functional groups allows for the exploration of various interaction forces (e.g., hydrogen bonding, p-p, cation-p, hydrophobic, and electrostatic interactions) which are pivotal in understanding the material interaction mechanisms. 33,45,51,52 The charge states of both the SAMs and the peptide (pI value: B 4.1) are known to vary with pH, necessitating the analysis at both low and high pH for a holistic view of the interaction mechanisms. Notably, the charge variations of amino acids within the peptide, influenced by pH changes, are critical to this analysis.…”