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Interacting collagen and tannic acid Particles: Uncovering pH-dependent rheological and thermodynamic behaviors.

Authors :
Sarker, Prottasha
Jani, Pallav K.
Hsiao, Lilian C.
Rojas, Orlando J.
Khan, Saad A.
Source :
Journal of Colloid & Interface Science. Nov2023:Part A, Vol. 650, p541-552. 12p.
Publication Year :
2023

Abstract

[Display omitted] Biomaterials such as collagen and tannic acid (TA) particles are of interest in the development of advanced hybrid biobased systems due to their beneficial therapeutic functionalities and distinctive structural properties. The presence of numerous functional groups makes both TA and collagen pH responsive, enabling them to interact via non-covalent interactions and offer tunable macroscopic properties. The effect of pH on the interactions between collagen and TA particles is explored by adding TA particles at physiological pH to collagen at both acidic and neutral pH. Rheology, isothermal titration calorimetry (ITC), turbidimetric analysis and quartz crystal microbalance with dissipation monitoring (QCM-D) are used to study the effects. Rheology results show significant increase in elastic modulus with an increase in collagen concentration. However, TA particles at physiological pH provide stronger mechanical reinforcement to collagen at pH 4 than collagen at pH 7 due to the formation of a higher extent of electrostatic interaction and hydrogen bonding. ITC results confirm this hypothesis, with larger changes in enthalpy, |Δ H |, observed when collagen is at acidic pH and |Δ H | > | T Δ S | indicating enthalpy-driven collagen-TA interactions. Turbidimetric analysis and QCM-D help to identify structural differences of the collagen-TA complexes and their formation at both pH conditions. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219797
Volume :
650
Database :
Academic Search Index
Journal :
Journal of Colloid & Interface Science
Publication Type :
Academic Journal
Accession number :
169929900
Full Text :
https://doi.org/10.1016/j.jcis.2023.06.209