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Title: The role of confined collagen geometry in decreasing nucleation energy barriers to intrafibrillar mineralization

Journal Article · · Nature Communications
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Washington Univ., St. Louis, MO (United States). Dept. of Energy, Environmental & Chemical Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  3. Columbia Univ., New York, NY (United States). Dept. of Orthopedic Surgery

Mineralization of collagen is critical for the mechanical functions of bones and teeth. Calcium phosphate nucleation in collagenous structures follows distinctly different patterns in highly confined gap regions (nanoscale confinement) than in less confined extrafibrillar spaces (microscale confinement). Although the mechanism(s) driving these differences are still largely unknown, differences in the free energy for nucleation may explain these two mineralization behaviors. Here, we report on experimentally obtained nucleation energy barriers to intra- and extrafibrillar mineralization, using in situ X-ray scattering observations and classical nucleation theory. Polyaspartic acid, an extrafibrillar nucleation inhibitor, increases interfacial energies between nuclei and mineralization fluids. In contrast, the confined gap spaces inside collagen fibrils lower the energy barrier by reducing the reactive surface area of nuclei, decreasing the surface energy penalty. The confined gap geometry, therefore, guides the two-dimensional morphology and structure of bioapatite and changes the nucleation pathway by reducing the total energy barrier.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1608545; DMR-1608554
OSTI ID:
1427508
Journal Information:
Nature Communications, Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 68 works
Citation information provided by
Web of Science

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Metastable Zirconium Phosphate under Nanoconfinement with Superior Adsorption Capability for Water Treatment journal February 2020
Use of tendon to produce decellularized sheets of mineralized collagen fibrils for bone tissue repair and regeneration journal June 2019
Physical origin underlying the prenucleation-cluster-mediated nonclassical nucleation pathways for calcium phosphate journal January 2019
Efficient synthesis of vitamin A palmitate in nonaqueous medium using self-assembled lipase TLL@apatite hybrid nanoflowers by mimetic biomineralization journal October 2018
Efficient synthesis of vitamin A palmitate in nonaqueous medium using self-assembled lipase TLL@apatite hybrid nanoflowers by mimetic biomineralization text January 2018
Efficient synthesis of vitamin A palmitate in nonaqueous medium using self-assembled lipase TLL@apatite hybrid nanoflowers by mimetic biomineralization text January 2018