Depression of the melting temperature by moisture for α‐form crystallites in human hair keratin

Cao, Jin; Leroy, Frédéric

doi:10.1002/bip.20186

Cited by 39 publications

(30 citation statements)

References 32 publications

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“…Using DTA to investigate the effect of water content of wool fibres on the melting of alpha‐keratin Hally and Snaith showed that the peak temperature of first endothermic effect lowers to around 140°C for wet fibres . Data obtained by thermomechanical measurements and by XRD confirmed that in water, keratin fibres lose their ordered regions at 140–150°C and DSC studies particularly on human hair with various moisture contents, led to similar results . The second endothermic process observed in ‘dry‐DSC’ measurements and assigned to the pyrolysis of matrix appears unaffected in wet experiments, as shown by the thermogravimetric curve recorded for a wet‐denatured hair in Fig.…”

Section: Differential Scanning Calorimetry Measurementmentioning

confidence: 81%

DSC of human hair: a tool for claim support or incorrect data analysis?

Popescu

Gummer²

2016

Intern J of Cosmetic Sci

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Differential scanning calorimetry (DSC) data are increasingly used to substantiate product claims of hair repair. Decreasing peak temperatures may indicate structural changes and chemical damage. Increasing the DSC, wet peak temperature is, therefore, often considered as proof of hair repair. A detailed understanding of the technique and hair structure indicates that this may not be a sound approach. Surveying the rich literature on the use of dynamic thermal analysis (DTA) and differential scanning calorimetry (DSC) for the analyses of human hair and the effect of cosmetic treatments, we underline some of the problems of hair structure and data interpretation. To overcome some of the difficulties of data interpretation, we advise that DSC acquired data should be supported by other techniques when used for claim substantiation. In this way, one can provide meaningful interpretation of the hair science and robust data for product claims support.R esum e Les donn ees de calorim etrie diff erentielle a balayage (DSC) sont de plus en plus utilis ees pour etayer les revendications des produits de r eparation des cheveux. Les pics de temp eratures d ecroissantes peuvent indiquer des changements structurels et des dommages chimiques. L'augmentation de la temp erature du pic DSC humide est donc souvent consid er ee comme une preuve de la r eparation des cheveux. Une compr ehension d etaill ee de la structure technique et des cheveux indique que ce n'est pas une bonne approche. Dans cette revue de la riche litt erature sur l'utilisation de l'analyse thermo-differentielle (DTA) et de la calorim etrie diff erentielle a balayage (DSC) pour l'analyse des cheveux humains et l'effet des traitements cosm etiques nous soulignons certains des probl emes de structure du cheveu et l'interpr etation des donn ees. Pour surmonter certaines des difficult es d'interpr etation des donn ees, nous sugg erons que les donn ees acquises par DSC soient compl et ees par d'autres techniques lorsqu'elle est utilis ee pour justification des revendications. De cette fac ßon, on peut fournir une interpr etation valable de la science des cheveux et des donn ees fiables pour l'objectivation des revendications de produit.

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Section: Differential Scanning Calorimetry Measurementmentioning

confidence: 81%

DSC of human hair: a tool for claim support or incorrect data analysis?

Popescu

Gummer²

2016

Intern J of Cosmetic Sci

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“…This phase melts irreversibly at a temperature that is both time-and regain-dependent (63)(64)(65). During the dyeing and finishing of wool, no melting of the fiber occurs.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Wool: Structure, Properties, and Processing

Rippon

Christoe

Denning

et al. 2016

Encyclopedia of Polymer Science and Technology

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Wool, the fibrous coating from sheep, is the most important animal fiber used by the textile industry. It has been used continuously for several thousand years, the earliest type of fabric made from wool probably being a felt. Although the relative importance of wool as a textile fiber has declined with the increasing use of synthetic fibers, it remains important in some sectors of the market. This article discusses raw wool specification, fiber growth, its complex morphological and chemical structure, and the physical properties that make wool unique among textile fibers. Also discussed are the processing steps used to transform raw wool into consumer products, namely, scouring, carbonizing, carding, spinning, setting, dyeing, bleaching, printing, and treatments to reduce felting shrinkage, insect damage, and flammability. A novel textile fiber made from wool (Optim TM , CSIRO) is also described.

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“…Samples were heated at a rate of 10 C/min from 0 C to a variable final temperature depending on the water content of the sample, ensuring the temperature was safely below denaturation events. The helical proteins in the IFs of human hair denature, depending on the water content of the fiber, between %210 C (dry) and %150 C (wet) [3,21]. Samples were then cooled at the same rate to 0 C. Two further heating/cooling cycles were performed to improve the success rate of T g detection.…”

Section: Dscmentioning

confidence: 99%