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Thermal analysis ofortho- andpara-cortical cells isolated from wool fibers

1998; Wiley; Volume: 68; Issue: 12 Linguagem: Inglês

10.1002/(sici)1097-4628(19980620)68

1097-4628

Franz Wortmann, H. Deutz,

Collagen: Extraction and Characterization

Journal of Applied Polymer ScienceVolume 68, Issue 12 p. 1991-1995 Thermal analysis of ortho- and para-cortical cells isolated from wool fibers F.-J. Wortmann, Corresponding Author F.-J. Wortmann Deutsches Wollforschungsinstitut an der RWTH Aachen e.V., Veltmanplatz 8, D-52062 Aachen, GermanyDeutsches Wollforschungsinstitut an der RWTH Aachen e.V., Veltmanplatz 8, D-52062 Aachen, Germany===Search for more papers by this authorH. Deutz, H. Deutz Wella AG, Berliner Allee 65, D-64274 Darmstadt, GermanySearch for more papers by this author F.-J. Wortmann, Corresponding Author F.-J. Wortmann Deutsches Wollforschungsinstitut an der RWTH Aachen e.V., Veltmanplatz 8, D-52062 Aachen, GermanyDeutsches Wollforschungsinstitut an der RWTH Aachen e.V., Veltmanplatz 8, D-52062 Aachen, Germany===Search for more papers by this authorH. Deutz, H. Deutz Wella AG, Berliner Allee 65, D-64274 Darmstadt, GermanySearch for more papers by this author First published: 07 December 1998 https://doi.org/10.1002/(SICI)1097-4628(19980620)68:12 3.0.CO;2-VCitations: 34AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract The nature of the bimodal denaturation endotherm, which has been observed for some α-keratin materials, was investigated in order to evaluate the validity of the two conflicting theories to interpret the phenomenon. Ortho- and para-cortical cells were isolated from Merino wool and subjected to measurements by differential scanning calorimetry in water at elevated temperatures (80–170°C). The results show for the isolated cell fractions denaturation peaks at 138°C (ortho) and 144°C (para) that are with respect to their location and temperature difference in good agreement with the results obtained for the whole fiber material. The denaturation enthalpy of the para- (21 J/g) was found to be higher than of the ortho-cortical cells (17 J/g) in contrast to expectations from electron diffraction studies. The fact that both of these values are higher than for the whole fiber (15 J/g) is attributed to the removal of the cuticle prior and to the enzymatic digestion of some further material during cell separation. The results give unequivocal evidence for the validity of the ortho/para-hypothesis for the interpretation of the endothermic denaturation doublet of keratins. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1991–1995, 1998 Citing Literature Volume68, Issue1220 June 1998Pages 1991-1995 RelatedInformation