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Portier F, Teulon C, Nowacka-Perrin A, Guenneau F, Schanne-Klein MC, Mosser G. Stabilization of Collagen Fibrils by Gelatin Addition: A Study of Collagen/Gelatin Dense Phases. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12916-12925. [PMID: 29087724 DOI: 10.1021/acs.langmuir.7b02142] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Collagen and its denatured form, gelatin, are biopolymers of fundamental interest in numerous fields ranging from living tissues to biomaterials, food, and cosmetics. This study aims at characterizing mixtures of those biopolymers at high concentrations (up to 100 mg·mL-1) at which collagen has mesogenic properties. We use a structural approach combining polarization-resolved multiphoton microscopy, polarized light microscopy, magnetic resonance imaging, and transmission electron microscopy to analyze gelatin and collagen/gelatin dense phases in their sol and gel states from the macroscopic to the microscopic scale. We first report the formation of a lyotropic crystal phase of gelatin A and show that gelatin must structure itself in particles to become mesogenic. We demonstrate that mixtures of collagen and gelatin phase segregate, preserving the setting of the pure collagen mesophase at a gelatin ratio of up to 20% and generating a biphasic fractal sample at all tested ratios. Moreover, differential scanning calorimetric analysis shows that each protein separates into two populations. Both populations of gelatins are stabilized by the presence of collagen, whereas only one population of collagen molecules is stabilized by the presence of gelatin, most probably those at the interface of the fibrillated microdomains and of the gelatin phase. Although further studies are needed to fully understand the involved mechanism, these new data should have a direct impact on the bioengineering of those two biopolymers.
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Affiliation(s)
- François Portier
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | - Claire Teulon
- LOB, Ecole Polytechnique, CNRS, Inserm U1182, Université Paris-Saclay , F-91128 Palaiseau, France
| | - Agnieszka Nowacka-Perrin
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | - Flavien Guenneau
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
| | | | - Gervaise Mosser
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Collège de France, LCMCP , F-75005 Paris, France
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