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It is part of the tanner’s job and skill to simplify or purify this starting material, allowing it to be converted into a product that is both desirable and useful in modern life. 1–4 The major component of skin is type I collagen: so, unless otherwise speciﬁed, the term ‘collagen’ will always refer to type I collagen. Other collagens do feature in leather making and their roles are deﬁned later. e. they are made up of amino acids. 1). Each one features a terminal amino group and a terminal carboxyl group, which become involved in the peptide link (see below), and a sidechain attached to the methylene group in the centre of the molecule.
32. L. Siggel and F. Molnar, J. Amer. Leather Chem. , 2006, 101(5), 179. 33. J. Cot, J. Amer. Leather Chem. , 2004, 99(8), 322. 34. htm. Accessed Feb. 10, 2009 35. com/forum. Accessed Feb. 10, 2009 36. K. T. W. Alexander, A. D. Covington, R. J. Garwood, A. M. , IULTCS Congress, Porto Alegre, Brazil, Nov. 1993. 37. H. E. C. Koon, PhD Thesis, University of York, October 2006. 38. P. L. Kronick, B. Maleeﬀ and R. Carroll, Conn. , 1988, 18, 123. 39. P. L. Kronick and B. Maleeﬀ, J. Amer. Leather Chem.
In its raw state, collagen can be solubilised. Moreover, the conditions causing the shrinking do result in diﬀerent intermediate states. 36 Alternatively, under acid conditions, crimping is less obvious because the hydrolysis reaction is slower, so the damaged ﬁbre structure is characterised by the presence of broken collagen chains and collagen fragments: the outcome in dried pelt is a cementing of the ﬁbre structure causing the material to be embrittled. When collagen is in a tanned state, depending on the chemistry of the process, the reaction typically stops at the shrunk stage.
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