Time‐varying migration process of moving neutralization boundary on the immobilized pH gradient strip in the weak‐base rehydration buffer

Abstract

This paper quantificationally probes into time-varying migration processes of moving neutralization boundary (MNB) on immobilized pH gradient (IPG) strip in ammonia-rehydration buffers. The time-varying migration processes are determined by both time-varying dissociation equilibria of ammonia and position-varying pH environments formed by immobilized carrier ampholytes (CAs) on the IPG strip. Thus, the local dissociation equilibria of ammonia and the position-varying pH are introduced into the recursion equation of position of MNB migrations. The theoretical position-time curves and the velocity-time curves of MNB migrations obtained by the recursion approach were satisfactorily validated by a series of images of boundary migrations from the IPG-MNB experiments by using rehydration buffers with different ammonia concentrations on pH 3-6 IPG strips. The results achieved herein have significant evidence to a quantificational understanding of the mechanism of MNB and IEF.

A facile double moving redox boundary model for visual electrophoresis titration of ascorbic acid

“…Since 1970, a series of systematic investigations have been performed on the six moving reaction boundaries (MRB), for example, moving neutralization boundary (MNB) [24][25][26][27][28][29], precipitate boundary [24,30,31], chelation boundary [32], and affinity or recognition boundary [33,34] as well as exchange boundary [35]. Especially, the concept of MRB has shown its valuable applications in separation, quantitative analysis, and sample stacking [25].…”