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Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings / Hongjiao Liang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 107, N° 3 (05-06/2023)
[article]
Titre : Preparation and application of a high exhaustion chrome tanning auxiliary from limed fleshings Type de document : texte imprimé Auteurs : Hongjiao Liang, Auteur ; Jun Zhao, Auteur ; Yulu Wang, Auteur ; Jin Liqiang, Auteur ; Zhang Feifei, Auteur Année de publication : 2023 Article en page(s) : p. 98-105 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Chaulage
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Propriétés thermiques
Cuirs et peaux de chèvres
Echarnage
Epuisement des tanins
Hydrolysats de protéines
Morphologie (matériaux)
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The recycling of leather solid waste has become a key issue aimed at realising the sustainable development of the leather industry. Recently, more and more attention has been paid on the recycling of limed fleshings. In this paper, a new recycling method for limed fleshings is reported. First, collagen protein hydrolysate (CH) was obtained by hydrolysing limed fleshings under alkaline conditions, and then the CHwas modified with cyanuric chloride (TCT) to obtain a high exhaustion chrome auxiliary (HECA). The coordination of HECA with chromium salts was investigated by ultraviolet-visible (UV-Vis) spectrum. HECA was applied in the chrome tanning process as an additive. The chrome concentration in effluent, the shrinkage temperature and mechanical properties of the resultant wet-blue were determined. Thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyse the properties of the obtained leather. The results show that HECA could coordinate with chromium salts and significantly improved the absorption and fixation of chrome salt into leather. When the amount of chrome tanning agent was 5% and the amount of HECA was 3%, the uptake of chrome tanning agent could be increased to 92.42%, the shrinkage temperature (Ts) of wet-blue leather could reach 102.8°C, the relative increases being 27.26% and 7.3°C, respectively, compared with the conventional tanning process. The obtained wet-blue leather demonstrated uniform grain, good fullness and improved mechanical properties. This recycling method provides a valuable insight of developing high exhaustion chrome tanning aid from limed fleshings, and consequently increases the economic and environmental benefits in leather production. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Preparation of collagen protein hydrolysate (CH) - Preparation of high exhaustion chrome auxiliary (HECA) - Coordination of HECA with chromium salt - Application of HECA in tanning process - Characterisation
- RESULTS AND DISCUSSIONS : Physicochemical index of CH - Characterisation of HECA - Coordination of HECA with chromium salt - Ts and chrome uptake rate - Thermal properties and morphology of the leather - XRD analysis of wet-blue leather - Mechanical properties of leather samples
- Table 1 : Tanning process of pickled goat pelts
- Table 2 : Basic characteristics of CH
- Table 3 : Mechanical properties of leather samplesEn ligne : https://drive.google.com/file/d/1DMihbpPPdVi8PEOBB1qi5aQ0eQbtKieW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39580
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 107, N° 3 (05-06/2023) . - p. 98-105[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24110 - Périodique Bibliothèque principale Documentaires Disponible Prévention des vergetures par application topique. Un essai pratique à l'insu de patient et du médecin / J. Mallol in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 13, N° 1 (02/1991)
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Titre : Prévention des vergetures par application topique. Un essai pratique à l'insu de patient et du médecin Type de document : texte imprimé Auteurs : J. Mallol, Auteur ; M. Sola, Auteur ; A. Noval, Auteur ; D. Costa, Auteur ; M. A. Belda, Auteur Année de publication : 1991 Article en page(s) : p. 51-57 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Asiaticoside
Collagène
Hydrolysats de protéines
Peau -- Soins et hygiène
Vitamine EIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Nous avons testé une crème préventive contre les vergetures en effectuant un test à l'insu du patient et du médecin sur 100 femmes enceintes (50 ont été traitées par un placebo et 50 avec la crème active).
La crème active contenait : de l'extrait de Centella asiatica, de l'a-tocophérol et du collagène/élastine hydrolysé.
Les crèmes ont été appliquées quotidiennement, à partir du 3ème mois de grossesse sur la poitrine, le ventre, les fesses et les hanches. l'étude a été réalisée sur une période de 30 mois au bout de laquelle nous avons obtenu 80 cas analysables (39 pour le groupe 'placebo' et 41 pour le groupe "crème active", les 2 groupes ne présentant pas de différences significatives au niveau des paramètres considérés : âge, prise de poids durant la grossesse, grandeur, nombre d'accouchements, biotype, couleur de la peau et des cheveux, groupe sanguin et antécédents familiaux (mère ayant des vergetures), poids et sexe de l'enfant.
Dans le groupe placebo 22 femmes (56 %) présentaient des vergetures tandis que dans le groupe traité, seulement 14 femmes (34 %) ont eu des vergetures pendant leur grossesse. Cette différence était significative (p < 0.05 ; test X2).
Une note arbitraire a été attribuée pour mesurer l'intensité des vergetures (sur une échelle de 0 à 3). Cette note était de 1.42 (sd 0.5) dans le groupe traité et 2.13 (sd 1.32) dans le groupe placebo et cette différence était également significative (p = 0.014 ; test Mann–Whitney).
Sur les femmes ayant des antécédents de vergetures durant la puberté, la crème active a produit une prévention absolue dans 89 % des cas alors que dans le groupe placebo, toutes les femmes avaient des vergetures (p = 0.00014 ; test X2).DOI : 10.1111/j.1467-2494.1991.tb00547.x En ligne : https://onlinelibrary.wiley.com/doi/10.1111/j.1467-2494.1991.tb00547.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5155
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 13, N° 1 (02/1991) . - p. 51-57[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003940 - Périodique Bibliothèque principale Documentaires Disponible Protein hydrolysates guard against heat damage / S. Mancon in PERSONAL CARE EUROPE, Vol. 12, N° 2 (04/2018)
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Titre : Protein hydrolysates guard against heat damage Type de document : texte imprimé Auteurs : S. Mancon, Auteur ; A. Mondelli, Auteur Année de publication : 2018 Article en page(s) : p. 177-179 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- analyse
Cheveux -- Soins et hygiène
Contraintes thermiques
Essais dynamiques
Extraits de plantes:Extraits (pharmacie)
Hydrolysats de protéines
Traction (mécanique)Index. décimale : 668.5 Parfums et cosmétiques Résumé : The prolonged use of heat styling devices may lead to cumulative effects on the hair fibre. These involve various physical and chemical changes of hair cuticle and cortex structure that seem significantly linked to a gradual protein thermal denaturation after exposure to high temperatures. The worsening of hair sensory attributesland hair breakage increase caused by cuticle and cortex layers degradation, are amongst the long-term damages of heat hairstyling : The aim of the present study was to evaluate the potential use of two Kelisema's protein hydrolysates derived from sesame seeds (Kelipro Sesame, INCI : Hydrolyzed Sesame Protein) and hemp seeds (Kelihemp, INCI : Hydrolyzed Cannabis Sativa Seed Extract) as hair heat protectants. Simulating a customer hair care practice, virgin hair tresses were pre-treated with protein hydrolysates aqueous solutions and subjected to repetitive thermal stress cycles using a straightening iron. Single-fibre tensile testing was performed to assess hair damage ; dry-state hair break stress and hair diameter change were evaluated. Note de contenu : - OBJECTIVE :
- MATERIALS AND METHODS : Protein hydrolysates and test solutions - Hair samples - Thermal treatment of hair - Hair strength evaluation
- Fig. 1. Hair diameter change. Data are reported as % change respect to virgin - hair. Statistically significant vs virgin - hair (p<0.05)
- Fig. 2. Hair strenght evaluation. data are normallised to hair diameter and expressed as % F/d (mN/µm) change respect to virgin - hair (100%). One-way ANOVA test resulted statistically significant (<0.05). Statistically significant vs virgin - hair (p<0.03)
- Fig. 3. Hair substantivity on virgin hair. Data reported on the graph are expressed after subtraction on control valuesEn ligne : https://drive.google.com/file/d/1Rnk1CqH2uSDM3YkrQk4lY7zT7XZOHyza/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30474
in PERSONAL CARE EUROPE > Vol. 12, N° 2 (04/2018) . - p. 177-179[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19931 - Périodique Bibliothèque principale Documentaires Disponible Purification of proetin hydrolyzate recovered from chrome tanned leather shaving waste / Rubina Chaudhary in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 1 (01/2016)
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Titre : Purification of proetin hydrolyzate recovered from chrome tanned leather shaving waste Type de document : texte imprimé Auteurs : Rubina Chaudhary, Auteur ; Anupama Pati, Auteur Année de publication : 2016 Article en page(s) : p. 10-16 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Déchets industriels -- Recyclage
Hydrolysats de protéines
Précipitation (chimie)
Produits chimiques -- Purification
Tannage -- DéchetsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Environmental constraints have become key issue for sustenance of industries worldwide. Waste management approach insists tanners look for an innovative way of creating wealth from waste. Chrome tanned leather shavings (CTLS) are generated in leather making process and requires a major attention on disposal. There are developed processes for recovery of protein and chromium from CTLS through acid/ alkaline/enzymatic hydrolysis process. However, the derived protein hydrolyzate contains impurities such as chromium and neutral salts. In this study, an attempt has been made to purify protein hydrolyzate through protein precipitation process. Protein purification studies have been carried out to study the influence of factors such as salt concentrations, pH and time. The purity of protein hydrolyzate before and after purification process is found to be 95 and 99.4% respectively. This is further evidenced from amino acid analysis of protein hydrolyzate before and after purification. The recovered protein hydrolyzate could be used in a wide range of products such as fertilizer, animal feed and bio-composites. Note de contenu : - EXPERIMENTAL : Materials - Extraction of protein hydrolyzate from chrome shavings through biochemical process - Purification of protein hydrolyzate derived from biochemical process : optimization of nature of salt, concentrations of salt and protein hydrolyzate, time and pH - Pilot trials - Characterization of protein hydrolyzate before and after purification
- RESULTS AND DISCUSSION : Underlying principles of protein precipitation through saltin out - Effect of nature of salts - Optimization of salt concentration for protein precipitation - Optimization of concentration of proteinous substance - Optimization of time for protein precipitation - Effect of pH on protein precipitation - Pilot trialsEn ligne : https://drive.google.com/file/d/1yCvBSSC1qlQKNwKw0vWkxpoeIgGrRR7d/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25273
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 1 (01/2016) . - p. 10-16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17767 - Périodique Bibliothèque principale Documentaires Disponible Recovery and characterization of protein hydrolysate from chrome shavings by microbial degradation / C. Shanthi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 6 (06/2013)
[article]
Titre : Recovery and characterization of protein hydrolysate from chrome shavings by microbial degradation Type de document : texte imprimé Auteurs : C. Shanthi, Auteur ; Pradipta Banerjee, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; G. Suseela Rajkumar, Auteur Année de publication : 2013 Article en page(s) : p. 231-239 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries
Biodégradation
Caractérisation
Collagène
Cuirs et peaux -- Déchets -- Recyclage
Hydrolysats de protéines
Récupération (Déchets, etc.)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chromium containing collagenous solid wastes from the leather tanning industry requires special attention because of the pressure exerted by environmental authorities for safe disposal. Such collagen-rich wastes can be recycled by adapting environmentally suitable and safer methods based on microorganism and/or enzymatic treatment, so as to obtain a collagen hydrolysate with potential applications. In the present study, chromium tolerant bacteria were isolated from tannery soil and screened for high proteolytic activity by zone-clearance assay and caseinolytic activity. The most potent bacterium, with a high proteolytic and chromium-tolerant ability was found to degrade about 90% of the chrome shavings in 120h and was identified as Alcaligenes faecalis. The hydrolysates at various time intervals of proteolysis were collected, chromium removed and characterized. The hydrolysate was found to have 12% ash and 80% protein or peptides contents after 120h of proteolysis with 3.14±2.0?g of chromium/g of protein. Molecular weight profiling done by gel filtration chromatography using sephadex G 25 and tricine-SDS-PAGE electrophoresis revealed that the major component of the hydrolysate comprised of small peptides in the molecular weight range of 3-30kDa. Note de contenu : - MATERIALS AND METHODS : Isolation of organism - Protease activity - Chromium tolerance - Degre of hydrolysis (%) and Cr3 removal from the chrome shavings - Analysis of the protein hydrolysate - pH determination by deionization - Gel filtration chromatography - Ion exchange chromatography - Tricine SDS-PAGE of the hydrolysate
- RESULTS AND DISCUSSION : Protease activity, identification and chromium tolerance of the screened bacterium - Chrome shaving hydrolysis process - Characterization of protein hydrolysate - Determination of molecular weight of protein hydrolysate by gel filtration and gel electrophoresisEn ligne : https://drive.google.com/file/d/1LQ3kblknV4gm5BdYm3xIrye-aspbynzD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18746
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 6 (06/2013) . - p. 231-239[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15158 - Périodique Bibliothèque principale Documentaires Disponible Recovery of collagen hydrolysate from chrome leather shaving tannery waste through two-step hydrolysis using magnesium oxide and bating enzyme / Alvin Asava Sasia in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)
PermalinkSanté/beauté des cheveux, des solutions multiples / Françoise Basset in PARFUMS COSMETIQUES ACTUALITES, N° 137 (11/1997)
PermalinkTransparent silicone-free shampoo containing proteins with strong hair conditioning properties / Ping Li in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 46, N° 1 (02/2024)
PermalinkUse of silk hydrolysate in chrome tanning / G. Itirli Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)
PermalinkUtilization of chromium-tanned leather solid wastes in microencapsulation / Bugra Ocak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)
PermalinkUtilization of tannery solid waste : Dry strength additive for papermaking / Yaohui You in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 7 (07/2013)
PermalinkWealth from tannery waste ? / Graham Lampard in LEATHER INTERNATIONAL, Vol. 214, N° 4826 (11-12/2012)
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