3-Amino-1,2,4-triazole at the chitosan–collagen interface: a mechanistic framework for bridging, capping and lattice inclusion
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Jahongir Mustaqim o‘g‘li Sharopov
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Chitosan–collagen hybrids derive their behaviour from a thin interfacial region where a cationic polysaccharide, a hydrated triple helix and ordered water compete for one hydrogen-bond inventory. This review asks what 3-amino-1,2,4-triazole (3-AT), an 84 Da hydrogen-bonding heterocycle, could do there. A structured search yielded 177 records (Supplementary Table S2); no eligible study combining all three components was identified within the defined search strategy, so every ternary statement is inference paired with a named falsifiable observable. With a conjugate-acid pKₐ of 4.04, 3-AT is 72 % neutral at pH 4.5 and 96 % at pH 5.5: it cannot serve as a counter-ion for chitosan ammonium or compete for collagen carboxylate, and being monovalent it cannot crosslink. Three non-covalent roles remain — interstitial bridging, capping of the hydrogen-bond ladder and inclusion in the hydrated chitosan lattice — behind two confounders to be excluded first: retitration of the casting sol by 3-AT itself, and covalent capture of its exocyclic amine by crosslinkers. The roles predict divergent diffraction, calorimetric, mechanical and degradation signatures, so they are experimentally separable; the necessary control set is specified.
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Authors
Jahongir Mustaqim o‘g‘li Sharopov
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Aboelnaga, A., Shaarawy, S., & Hagar, M. (2017) A novel chitosan 3-amino-1,2,4-triazole hybrid: Preparation and its effects on cotton fabric. Journal of Taibah University for Science, 11 (5), 768–774. https://doi.org/10.1016/j.jtusci.2016.08.008
Becerra, J., Rodriguez, M., Leal, D., et al. (2022) Chitosan-collagen-hydroxyapatite membranes for tissue engineering. Journal of Materials Science: Materials in Medicine, 33, 18. https://doi.org/10.1007/s10856-022-06643-w
Bella, J., Eaton, M., Brodsky, B., et al. (1994) Crystal and molecular structure of a collagen-like peptide at 1.9 Å resolution. Science, 266 (5182), 75–81. https://doi.org/10.1126/science.7695699
Devernois, E., & Coradin, T. (2023) Synthesis, characterization and biological properties of type I collagen-chitosan mixed hydrogels: A review. Gels, 9 (7), 518. https://doi.org/10.3390/gels9070518
Erdmann, R. S., & Wennemers, H. (2013) Conformational stability of triazolyl functionalized collagen triple helices. Bioorganic & Medicinal Chemistry, 21 (14), 3565–3570. https://doi.org/10.1016/j.bmc.2013.02.046
Frushour, B. G., & Koenig, J. L. (1975) Raman scattering of collagen, gelatin, and elastin. Biopolymers, 14 (2), 379–391. https://doi.org/10.1002/bip.1975.360140211
Grabska-Zielińska, S., Sionkowska, A., Olewnik-Kruszkowska, E., et al. (2021) Collagen/chitosan/silk fibroin scaffolds cross-linked by EDC/NHS. Materials, 14 (5), 1105. https://doi.org/10.3390/ma14051105
Kaczmarek-Szczepańska, B., D’Amora, U., Zasada, L., et al. (2025) Chitosan-collagen biocomposite thin films with potassium silicate and tannic acid. Polymers, 17 (5), 608. https://doi.org/10.3390/polym17050608
Kröger, C. F., & Freiberg, W. (1965) Protonation constants of 3-amino-1,2,4-triazole. Zeitschrift für Chemie, 5, 381.
Landauer, W., Salam, N., & Sopher, D. (1971) The herbicide 3-amino-1,2,4-triazole (amitrole) as teratogen. Environmental Research, 4 (6), 539–543. https://doi.org/10.1016/0013-9351(71)90014-4
Lawrie, G., Keen, I., Drew, B., et al. (2007) Interactions between alginate and chitosan biopolymers characterized using FTIR and XPS. Biomacromolecules, 8 (8), 2533–2541. https://doi.org/10.1021/bm070014y
Margoliash, E., Novogrodsky, A., & Schejter, A. (1960) Irreversible reaction of 3-amino-1:2:4-triazole and related inhibitors with the protein of catalase. Biochemical Journal, 74 (2), 339–348. https://doi.org/10.1042/bj0740339
Melacini, G., Bonvin, A. M. J. J., Goodman, M., et al. (2000) Hydration dynamics of the collagen triple helix by NMR. Journal of Molecular Biology, 300 (4), 1041–1049. https://doi.org/10.1006/jmbi.2000.3919
Mucha, M., Pagacz-Kostrzewa, M., & Wierzejewska, M. (2023) Structure and IR spectroscopic properties of complexes of 1,2,4-triazole and 3-amino-1,2,4-triazole. Spectrochimica Acta Part A, 285, 121901. https://doi.org/10.1016/j.saa.2022.121901
Naito, P.-K., Ogawa, Y., Kimura, S., et al. (2015) Crystal transition from hydrated chitosan and chitosan/monocarboxylic acid complex to anhydrous chitosan. Journal of Polymer Science Part B, 53 (15), 1065–1069. https://doi.org/10.1002/polb.23748
Ostrowska-Czubenko, J., & Gierszewska-Drużyńska, M. (2009) Effect of ionic crosslinking on the water state in hydrogel chitosan membranes. Carbohydrate Polymers, 77 (3), 590–598. https://doi.org/10.1016/j.carbpol.2009.01.036
Przybyłek, M., Bełdowski, P., Wieland, F., et al. (2022) Collagen type II-chitosan interactions from molecular dynamics simulations. Molecules, 28 (1), 154. https://doi.org/10.3390/molecules28010154
Rinaudo, M. (2006) Chitin and chitosan: Properties and applications. Progress in Polymer Science, 31 (7), 603–632. https://doi.org/10.1016/j.progpolymsci.2006.06.001
Rinaudo, M., Pavlov, G., & Desbrières, J. (1999) Influence of acetic acid concentration on the solubilization of chitosan. Polymer, 40 (25), 7029–7032. https://doi.org/10.1016/S0032-3861(99)00056-7
Shah, R., Stodulka, P., Skopalova, K., & Saha, P. (2019) Dual crosslinked collagen/chitosan film for potential biomedical applications. Polymers, 11 (12), 2094. https://doi.org/10.3390/polym11122094
Sharopov, J. M. (2026) Supplementary dataset — 3-amino-1,2,4-triazole at the chitosan–collagen interface [Data set]. Zenodo. https://doi.org/10.5281/zenodo.22009239
Sánchez-Soto, P. J., Morillo, E., & Pérez-Rodríguez, J. L. (1995) Thermoanalytical study of the pesticide 3-amino-1,2,4-triazole. Journal of Thermal Analysis, 45 (5), 1189–1197. https://doi.org/10.1007/BF02547493
Taravel, M. N., & Domard, A. (1993) Relation between the physicochemical characteristics of collagen and its interactions with chitosan: I. Biomaterials, 14 (12), 930–938. https://doi.org/10.1016/0142-9612(93)90135-O
Thongchai, K., Chuysinuan, P., Thanyacharoen, T., et al. (2020) Integration of collagen into chitosan blend film composites: Physicochemical property aspects. SN Applied Sciences, 2, 255. https://doi.org/10.1007/s42452-020-2052-5
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