Polyphosphate–Chitosan Polyelectrolyte Complexation

•Chitosan and polyphosphates form solid complexes; coacervation is not observed.•More salt is required for longer polyphosphate chains to prevent complexation.•Chitosan-polyphosphate systems are more suited to developing solid biomaterials. The literature on complexation between chitosan and sodium...

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Bibliographic Details
Published in:Materials letters 2024-07, Vol.366, p.136525, Article 136525
Main Authors: Fanaee, Sajjad, Filiaggi, Mark Joseph
Format: Article
Language:English
Subjects:
Chitosan
Coacervation
Complexation
Polyelectrolyte
Sodium polyphosphate
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Summary:•Chitosan and polyphosphates form solid complexes; coacervation is not observed.•More salt is required for longer polyphosphate chains to prevent complexation.•Chitosan-polyphosphate systems are more suited to developing solid biomaterials. The literature on complexation between chitosan and sodium polyphosphates is limited to very short polyphosphates with degrees of polymerization of 2 to 6. Here, for the first time, polyelectrolyte complexation between chitosan and moderately long (Dp = 22) polyphosphates was studied. Using turbidity measurements, optical microscopy, and visual observations the phase diagram of the system was determined and compared to a traditionally deployed tripolyphosphate system. Such diagrams are rare but could be important to anticipate the products of a reaction of specific polyelectrolyte pairs. It was shown that this chitosan-polyphosphate system is not capable of forming coacervates and is therefore more appropriate for developing solid rather than liquid biomaterial precursors.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2024.136525