Fabrication and characterization of regenerated leather using chrome shavings as raw materials / Cuicui Ding in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 5 (05/2017)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXII, N° 5 (05/2017) . - p. 145-152 Titre : Fabrication and characterization of regenerated leather using chrome shavings as raw materials Type de document : texte imprimé Auteurs : Cuicui Ding, Auteur ; Min Zhang, Auteur ; Libo Dai, Auteur ; Yingying Qi, Auteur ; Ronghui Shi, Auteur ; Junhui Yang, Auteur Année de publication : 2017 Article en page(s) : p. 145-152 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mécanique dynamique Analyse thermique Cuir reconstitué Microscopie électronique à balayage Polymères en émulsion Polyuréthanes Pressage à chaud Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Regenerated leather billet (semi-finished product) was prepared via hot pressing with chrome shaving and environment-friendly polymer waterborne polyurethanes (WPU) as the materials. The influence of WPU/chrome shaving ratios (w/w) on the performance of the billet was investigated by mechanical property test, dynamic thermal mechanical analysis, thermogravimetric analysis, differential scanning calorimetry and field-emission scanning electron microscopy. Furthermore, the ability of heat storage and temperature regulation was endowed for the regenerated leather by the addition of paraffin microcapsules. The results showed that a strong interface interaction could be achieved for the regenerated leather billet, which could be due to the formation of hydrogen bonds and the entanglement between WPU and leather shavings. In this way, WPU/leather shaving composites with favorable mechanical properties, thermal stability, ability of heat storage and temperature regulation were obtained. Note de contenu : - MATERIALS AND METHODS : Materials - Sample preparation - Mechanical properties tests of regenerated leathers - Dynamic mechanical analysis (DMA) - Thermogravimetric analysis (TGA) - Field-emission scanning electron microscopy (FESEM) - Differential scanning calorimetry (DSC) - Dynamic thermal mechanical properties of regenerated leathers - Thermogravimetricc analysis of regenerated leathers - Morphology of regenerated leathers - DSC thermograms of regenerated leathers En ligne : https://drive.google.com/file/d/11sHls5bq_Vn7T2GYgPB0sR1XXAgRmOI6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28550 [article]

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Preparation and characterization of alkali-soluble collagen from pigskin shavings / Shuai Shao in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 10 (10/2009) . - p. 344-351 Titre : Preparation and characterization of alkali-soluble collagen from pigskin shavings Type de document : texte imprimé Auteurs : Shuai Shao, Auteur ; Min Zhang, Auteur ; Li Guoying, Auteur ; Wentao Liu, Auteur Année de publication : 2009 Article en page(s) : p. 344-351 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather industry discharges large quantities of solid wastes containing high-value native collagen. In this study, the pigskin shavings generated from the shaving of pelts which had been dehydrated with anhydrous sodium sulfate after deliming were pretreated to remove most of salt and fat. Then alkaline treatment method was used to extract collagen from the pigskin shavings. Sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and circular dichroism (CD) spectra revealed that the alkali-soluble pigskin collagen (ASPC) retained the polypeptide chains and triple helix conformation. The amino acid profiles showed no major deviation from the characteristic collagen composition. Both of the denaturation temperature and the isoelectric point (pI) of ASPC were lower than those of pepsin-solubilized pigskin collagen (PSPC). Scanning electron microscopy showed that ASPC sponges had porous fibrillar network structures, and the pore sizes became larger with the decrease of collagen concentrations and as the pH of the collagen solution approached the pI of ASPC. En ligne : https://drive.google.com/file/d/1oxrpfE-DAUNzUkC1P-_gIBBVEs02RTLj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6371 [article]

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Scalp hair loss is not random across follicular units : A new insight into human hair ageing / Junyu Luo in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 4 (08/2023)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 4 (08/2023) . - p. 548-555 Titre : Scalp hair loss is not random across follicular units : A new insight into human hair ageing Type de document : texte imprimé Auteurs : Junyu Luo, Auteur ; Qili Qian, Auteur ; Wenxin Zheng, Auteur ; Ieva Gripkauskaite, Auteur ; Sijie Wu, Auteur ; Min Zhang, Auteur ; Jinxi Li, Auteur ; Bingfei Fu, Auteur ; Ranjit Bhogal, Auteur ; Peter Murray, Auteur ; Matthew Rowson, Auteur ; Bin Li, Auteur ; Xiangyang Xue, Auteur ; Xuelan Gu, Auteur ; Yajun Yang, Auteur ; Li Jin, Auteur ; David Andrew Gunn, Auteur ; Sijia Wang, Auteur Année de publication : 2023 Article en page(s) : p. 548-555 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Croissance Cheveux -- Vieillissement Dermatologie Différences entre sexes Modèles numériques Index. décimale : 668.5 Parfums et cosmétiques Résumé : - Objectives : Scalp hair has the greatest number of hairs (typically 1–5) per follicular unit but is also the most susceptible body site to hair loss with age. Hence, we set-out to determine the degree to which scalp hair parameters change with age in women and men, any sex differences thereof and whether hair loss is random across follicular units. - Methods : A retrospective cross-sectional study of 200 Chinese men and 200 Chinese women (30–69 years). Image analysis and manual counting methods were used to measure occipital located hair parameters from 6 × 8 mm shaved scalp photographs and plucked hair microscopy images. - Results : Of the five hair parameters, the number of hairs per follicular unit had the greatest (negative) correlation with age in both men and women. Men had a greater number of hairs and follicular units than women on average but had a greater decrease in the number of hairs per follicular unit with age, particularly for the loss of multi-hair (3+) follicular units. The loss of hairs with age was significantly different to that expected by a random loss of hairs across follicular units and better described by a model of increased hair loss risk the greater number of hairs per follicular unit. - Conclusions : We have found evidence of hair loss preferentially occurring in multi-hair follicular units, which was more pronounced in men. These data suggest that part of the reason scalp hair is more susceptible to hair loss than on other body sites is due to the greater presence of multi-hair follicular units on the scalp. Note de contenu : - MATERIALS AND METHODS : Subject selection - Measurement of hair parameters - Data analyses - Modelling loss of hair fibres - RESULTS : Hair parameters and sex differences - Hair parameter changes with age - Hairs per follicle unit and their change with age - Table 1 : Hair parameter characteristics by sex DOI : https://doi.org/10.1111/ics.12851 En ligne : https://drive.google.com/file/d/1MEvrUCIkxUsepl_tUSKwAAZPrRfuR7dB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39885 [article]

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