1987
DOI: 10.1007/bf01412398
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Thermoanalytical investigations of extended and annealed keratins

Abstract: DSC investigations have been used to characterize the microfibril-matrix complex of keratin consisting of helical low-sulfur microfibrils in a nonhelical high-sulfur matrix. The corresponding DSC curves display one or two endothermic peaks in the temperature range 230 ~ ~ The first peak is a microfibrillar peak and the second one a matrix peak (cystine decomposition peak). DSC investigations of extended keratins have shown that the microfibrillar peak is a helix peak. DSC investigations of annealed keratins co… Show more

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Cited by 71 publications
(60 citation statements)
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“…The first effect is attributed to the melting of the crystalline phase, that is the unfolding of the alpha helices, and is termed as the thermal denaturation of keratin fibres [4]. The process is irreversible and kinetically controlled by the surrounding environment, which is the amorphous matrix phase, made of IFAPs, in which the alpha-helices are embedded [4][5][6]. The amino-acid compositions of fibre, cortex, cuticle and micro-tubes, as given in Table 1, are quite similar.…”
Section: Resultsmentioning
confidence: 99%
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“…The first effect is attributed to the melting of the crystalline phase, that is the unfolding of the alpha helices, and is termed as the thermal denaturation of keratin fibres [4]. The process is irreversible and kinetically controlled by the surrounding environment, which is the amorphous matrix phase, made of IFAPs, in which the alpha-helices are embedded [4][5][6]. The amino-acid compositions of fibre, cortex, cuticle and micro-tubes, as given in Table 1, are quite similar.…”
Section: Resultsmentioning
confidence: 99%
“…The keratin fibres exhibit a relatively high thermal stability; the fibre properties remain almost intact until 200 °C [4][5][6]. The ability of keratins to preserve their properties up to high temperatures, apart from the obvious benefit for body protection, is of interest for the potential to design thermally highly stable proteins [6].…”
Section: Introductionmentioning
confidence: 99%
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“…5a, b). The presence of peak of protein denaturation followed by protein degradation [22], which falls at 298°C in the composite film, shifts to a lower temperature of 293°C in the electrospun sample, was observed in the range of 200-350°C. It should be pointed out that the high draw, given by the electrospinning process, leading the protein chains to a less complex super-molecular reorganization that denatures at lower temperatures [23].…”
Section: Thermal Behaviormentioning
confidence: 93%
“…Spei & Holzem (1987) , sob atmosfera dinâmica de N 2 e empregando cápsula de Al parcialmente fechada contendo cerca de 2 mg de amostras das mechas de cabelo brasileiro virgem e descoloridas tratadas com as formulações F3A, F3B e F3C após o tratamento térmico.…”
Section: Os Resultados Extraídos Das Curvas Dsc Dasunclassified