Age dependent differences in collagen alignment of glutaraldehyde fixed bovine pericardium.

Abstract:

:Bovine pericardium is used for heart valve leaflet replacement where the strength and thinness are critical properties. Pericardium from neonatal animals (4-7 days old) is advantageously thinner and is considered as an alternative to that from adult animals. Here, the structures of adult and neonatal bovine pericardium tissues fixed with glutaraldehyde are characterized by synchrotron-based small angle X-ray scattering (SAXS) and compared with the mechanical properties of these materials. Significant differences are observed between adult and neonatal tissue. The glutaraldehyde fixed neonatal tissue has a higher modulus of elasticity (83.7 MPa) than adult pericardium (33.5 MPa) and a higher normalised ultimate tensile strength (32.9 MPa) than adult pericardium (19.1 MPa). Measured edge on to the tissue, the collagen in neonatal pericardium is significantly more aligned (orientation index (OI) 0.78) than that in adult pericardium (OI 0.62). There is no difference in the fibril diameter between neonatal and adult pericardium. It is shown that high alignment in the plane of the tissue provides the mechanism for the increased strength of the neonatal material. The superior strength of neonatal compared with adult tissue supports the use of neonatal bovine pericardium in heterografts.

journal_name

Biomed Res Int

authors

Sizeland KH,Wells HC,Higgins J,Cunanan CM,Kirby N,Hawley A,Mudie ST,Haverkamp RG

doi

10.1155/2014/189197

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

189197

eissn

2314-6133

issn

2314-6141

journal_volume

2014

pub_type

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