X-ray diffraction study into the effects of liming on the structure of collagen

Clark A Maxwell, Timothy J Wess, Craig J Kennedy

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    67 Citations (Scopus)

    Abstract

    The manufacture of parchment from animal skin involves processes that remove hair, fats, and other
    macromolecules. Although it is well understood that the collagen fibers “open up” during processing, this study
    uses small and wide-angle X-ray diffraction to measure quantitatively the changes induced at the nanoscopic and
    microscopic levels. The axial rise per residue distance within the collagen molecules is unaffected by salt and
    lime treatments. Salting of the hides appears to remove noncollagenous materials. The intermolecular lateral
    packing distance between the hydrated collagen molecules (1.4 nm) increases after salting (1.5 nm) and liming
    (1.55 nm); drying is responsible for a reduction to 1.2 nm in all samples. The axial staggered array (d spacing)
    is reduced by 1 nm after liming and is unaffected by drying. The average fibril diameter increases from 103.2 to
    114.5 nm following liming, and the fibril-to-fibril distance increases from 122.6 to 136.1 nm.
    Original languageEnglish
    Pages (from-to)2321-2326
    Number of pages6
    JournalBiomacromolecules
    Volume7
    Issue number8
    DOIs
    Publication statusPublished - Aug 2006

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