Keratin made micro-tubes: The paradoxical thermal behavior of cortex and cuticle

Daniel Istrate; Meriem Er Rafik; Crisan Popescu; Dan E. Demco; Larisa Tsarkova; Franz Wortmann

doi:10.1016/j.ijbiomac.2016.05.035

Keratin made micro-tubes: The paradoxical thermal behavior of cortex and cuticle

Daniel Istrate, Meriem Er Rafik, Crisan Popescu, Dan E. Demco, Larisa Tsarkova, Franz Wortmann

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Abstract

Keratin micro-tubes were obtained by heating medullated keratin fibres to temperatures above 230 °C under nitrogen atmosphere, when, as documented by microscopy, the cortex (the core of the fibre) melts from the medulla outwards, followed by pyrolysis of the material through the remaining solid cuticle (shell) layer. The resulted hollow tubes from fibres void of cortical material keep the external cuticle structure, as shown by AFM investigation, and the moisture sorption properties of the initial keratin fibre. Despite similar amino-acid compositions of cuticle and cortex the two morphological components differ significantly in their thermal behaviour, which appears to be a "cortex-cuticle thermal stability paradox".

Original language	English
Pages (from-to)	592-598
Number of pages	7
Journal	International Journal of Biological Macromolecules
Volume	89
Early online date	11 May 2016
DOIs	https://doi.org/10.1016/j.ijbiomac.2016.05.035
Publication status	Published - 1 Aug 2016

Keywords

Cuticle
Keratin fibre
Micro-tubes
Thermal stability

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10.1016/j.ijbiomac.2016.05.035

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abstract = "Keratin micro-tubes were obtained by heating medullated keratin fibres to temperatures above 230 °C under nitrogen atmosphere, when, as documented by microscopy, the cortex (the core of the fibre) melts from the medulla outwards, followed by pyrolysis of the material through the remaining solid cuticle (shell) layer. The resulted hollow tubes from fibres void of cortical material keep the external cuticle structure, as shown by AFM investigation, and the moisture sorption properties of the initial keratin fibre. Despite similar amino-acid compositions of cuticle and cortex the two morphological components differ significantly in their thermal behaviour, which appears to be a {"}cortex-cuticle thermal stability paradox{"}.",

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AU - Istrate, Daniel

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AU - Demco, Dan E.

AU - Tsarkova, Larisa

AU - Wortmann, Franz

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AB - Keratin micro-tubes were obtained by heating medullated keratin fibres to temperatures above 230 °C under nitrogen atmosphere, when, as documented by microscopy, the cortex (the core of the fibre) melts from the medulla outwards, followed by pyrolysis of the material through the remaining solid cuticle (shell) layer. The resulted hollow tubes from fibres void of cortical material keep the external cuticle structure, as shown by AFM investigation, and the moisture sorption properties of the initial keratin fibre. Despite similar amino-acid compositions of cuticle and cortex the two morphological components differ significantly in their thermal behaviour, which appears to be a "cortex-cuticle thermal stability paradox".

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Keratin made micro-tubes: The paradoxical thermal behavior of cortex and cuticle

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