20071
Accession Number
27853
Editor
Vandiver, Pamela B.; Druzik, James R.; Wheeler, George Segan; Freestone, Ian C.
Title Of Article Chaper
Loss of infrared linear dichroism in collagen fibers as a measure of deterioration in skin and semi-tanned leather artifacts
Title Of Journal Book
Materials issues in art and archaeology III: symposium held 27 April-1 May 1992, San Francisco
Volume
267
Pages
859-867
Collation
3 figs., 1 table
Reference Bibliography
26 refs.
Publisher
Materials Research Society
Publisher City
Pittsburgh
ISBN
1-55899-162-X
ISSN
0272-9172
Language Of Text
English
Language Of Summary
English
Literature Type
Monograph
Literature Level
Analytic
Meeting
Materials Research Society Symposium
Meeting City
San Francisco
Abstract
Polarized radiation is used in a Fourier transform infrared (FTIR) microspectroscopic technique to detect molecular conformational change in collagen fibers resulting from deterioration. Absorbance spectra of single fibers are produced with polarization oriented first parallel (A<sub>(</sub>horizontal)</sub>) and then perpendicular (A<sub>(</sub>perpendicular)</sub>) to the fiber axis. The amide III band (1230-1300 cm<sup>-1</sup>) shows strong positive dichroism, with up to six times greater absorbance occurring with parallel polarization. Losses of dichroism result from breakdown in the molecular structure of collagen. Integrations of the amide III bands are used in ratios, A<sub>(</sub>horizontal)</sub>/A<sub>(</sub>perpendicular)</sub>, which provide a measure of the degree of molecular order. Ratios for degraded and undegraded material are compared to produce semi-quantitative information about deterioration. -- CAL
Keywords
infrared;collagen;fiber;deterioration;skin;tanned;leather -- CAL -- CAL
pub_id
20071
Meeting Date
19920427-19920501