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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CXVII, N° 6Mention de date : 06/2022Paru le : 07/07/2022 |
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Ajouter le résultat dans votre panierRole of natural binders in leather finishing : A comparative approach / Janani Venkatramani in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)
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Titre : Role of natural binders in leather finishing : A comparative approach Type de document : texte imprimé Auteurs : Janani Venkatramani, Auteur ; Bindia Sahu, Auteur Année de publication : 2022 Article en page(s) : p. 223-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Finition
Enduction
Etudes comparatives
LiantsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather finishing has its own importance in leather making. A variety of chemicals are used in the finishing operation, to provide the aesthetic look of the leather products. The role of finishing chemicals such as pigments, dyes, plasticizers, wax emulsions, cross linkers, fillers, wetting, penetrating agents and binders have their own role to give finished look to the leather products. A binder plays significant role in the leather finishing. This review elaborated on the role of natural binders with respect to their properties, application and binding effects in leather finishing against synthetic binders. This review focuses on a greener approach to leather finishing. Note de contenu : - Role of finishing step
- Different coats used in leather finishing
- Different types of finishing techniques used in leather finishing
- Different types of finishing chemicals consist of natural compounds
- Binders - The role of binder
- Tyes of binders used for leather finishing
- Environmental concern
- Fig. 1 : Processes involved in leather processing
- Fig. 2 : Different types of coating process in leather finishing
- Fig. 3 : Different types of finishing techniques for leather finishing
- Fig. 4 : The comparative properties of natural and synthetic binders
- Table 1 : Represent the different types of leather finishing techniques
- Table 2 : Finishing materials consisting of natural compounds
- Table 3 : List of binders for leather finishingDOI : https://doi.org/10.34314/jalca.v117i6.4963 En ligne : https://drive.google.com/file/d/1-eBX-91oLOZ_0BtHPi_BL-lZyfDo1FcE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37797
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 223-231[article]Réservation
Réserver ce documentAntibacterial potency for mimosa, quebracho and essential oils of origanum species against acinetobacter pittii, klebsiella pneumoniae and bacillus cereus from diabetic foot patient / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)
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Titre : Antibacterial potency for mimosa, quebracho and essential oils of origanum species against acinetobacter pittii, klebsiella pneumoniae and bacillus cereus from diabetic foot patient Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; L. Inanc, Auteur ; Ipek Türkmenoglu, Auteur ; O. Toksöz, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2022 Article en page(s) : p. 232-240 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Diabète
Extraits de plantes
Extraits de plantes:Extraits (pharmacie)
Huile essentielle d'origan
Mimosa et constituants
QuebrachoLe quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches.
Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ;
Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae.
Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache.
StatistiqueIndex. décimale : 660.62 Microbiologie industrielle Résumé : The diabetic patients may sometime suffer from foot lesions, foot ulcers and amputation that adversely affect their quality of life. In this respect, good footwear has a critical significance for diabetic foot patients. The aim of this study to evaluate the potential efficacy of mimosa, quebracho, and essential oils of Origanum onites, Origanum onites oleum, and Origanum minutiflorum, against Acinetobacter pittii, Bacillus cereus, and Klebsiella pneumoniae, which was isolated from diabetic foot patient. According to our results, the mimosa extracts were slightly more efficient when compared to quebracho extracts to control the bacterial growth of A. pittii (8.77±0.58-35.12±8.41% inhibition for three doses), and K. pneumoniae (21.40±0.48-47.04±0.51% inhibition) except B. cereus (71.1±0.31-23.51±1.66% inhibition). But these inhibition percentages remained at lower levels. On the other hand, essential oil samples of O. onites, O. onites oleum, and O. minutiflorum at tested doses have considerably high antibacterial effects against A. pittii, B. cereus, and K. pneumoniae. The tested essential oils almost completely inhibited B. cereus with percentages of inhibition ranging from 96.18±2.98-100±0.00. Also, the bacterial growth of K. pneumoniae and A. pittii was inhibited by 88.01±2.36 to 100±0.00% and 71.42±12.57 to 100±0.00%, respectively. Moreover, the essential oils of O. onites, O. onites oleum, and O. minutiflorum, had bactericidal activity against A. pittii, and K. pneumoniae but bacteriostatic activity against B. cereus. This potency for essential oil of Origanum species may be evaluated for diabetic footwear. More detailed technical studies are required for the application of Origanum species to leather footwear. Note de contenu : - MATERIALS AND METHODS : Bacterial strain and test materials - Antibacterial tests - Statistical analyses
- RESULTS AND DISCUSSION : Antibacterial efficacy of mimosa extracts against tested bacteria - Antibacterial efficacy of quebracho extracts against tested bacteria - Antibacterial efficacy of essential oils of O. onites, O. onites oleum, and O. minutiflorum - Statistical analysesDOI : https://doi.org/10.34314/jalca.v117i6.4964 En ligne : https://drive.google.com/file/d/1tkUAsnRyp1nzpjK77BOJP0MsQbPbfBEg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37798
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 232-240[article]Réservation
Réserver ce documentRecovery of industrially useful hair and fat from enzymatic unhairing of goatskins during leather processing / Joseph Ondari Nyakundi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)
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Titre : Recovery of industrially useful hair and fat from enzymatic unhairing of goatskins during leather processing Type de document : texte imprimé Auteurs : Joseph Ondari Nyakundi, Auteur ; Jackson Nyarongi Ombui, Auteur ; Wycliffe Chisutia Wanyonyi, Auteur ; Francis Jakim Mulaa, Auteur Année de publication : 2022 Article en page(s) : p. 241-250 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux de chèvres
Epilage enzymatique
Essais (technologie)
Evaluation
Huiles et graisses -- Recyclage
Huiles et graisses animales
Poils -- Recyclage
Qualité -- Contrôle
Récupération (Déchets, etc.)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather processing not only serves social needs by putting into use the meat industry’s by-products (hides and skins) but also makes a significant contribution to global economic growth through trade and job creation. In the wake of globalization, however, leather manufacturers are facing new challenges in meeting environmental imperatives and improving the utilization of wastes generated during leather processing. This study describes the recovery of hair and fat
from fleshings obtained after enzymatic unhairing of goatskins using a protease from an isolate of Bacillus cereus Strain 1-p. The recovered hair and fats were further characterized to facilitate recommendations for different industrial applications. The following hair properties were visually examined and evaluated by hand ; straight length, density and uniformity, hair strength and overall quality. The fats were analyzed by characterizing the fatty acid composition using the Gas Chromatography-Mass Spectrometry (GC-MS analysis). The recovered hair was intact and rated to be of average to good quality. The fat characterization indicated that methyl 9Z-octadecenoate (9Z-heptadecenoic acid; oleic acid) was the most abundant fatty acid with an abundance of 31.65%. The sulfide-free fats and intact hair, therefore, were recommended for use in various industrial applications such as manufacturing of poultry feedstuff, organic fertilizers, biodiesel and biofuels, fatliquoring agents, soaps and cosmetics after further purification where necessary. The hair and fats recovered from this study are particularly advantageous over those recovered from sulfide unhairing systems as they are free from any sulfides or lime contamination thus easier to purify and use. The study concluded that the use of the enzyme extract from Bacillus cereus Strain 1-p to unhair goatskins facilitated the recovery of valuable hair and fats that can be used for other industrial applications.Note de contenu : - MATERIALS AND METHODS : Materials - Methods (Enzyme preparation - Unhairing of goatskins) - Characterization of the recovered products
- RESULTS AND DISCUSSION : Recovered hair analysis - Recovered fat analysis
- Table 1 : Assesment of recovered hair quality
- Table 2 : Fatty acids test resultsDOI : https://doi.org/10.34314/jalca.v117i6.4965 En ligne : https://drive.google.com/file/d/13xpAHCyMlTJBIwqMWXKZCUw9d_FUgOJp/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37799
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 241-250[article]Réservation
Réserver ce documentStudy of the biodegradability of leather tanned with sodium aluminosilicate / Salvador Esquerra-Resa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)
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Titre : Study of the biodegradability of leather tanned with sodium aluminosilicate Type de document : texte imprimé Auteurs : Salvador Esquerra-Resa, Auteur ; Salvador Esquerra-Dot, Auteur ; Alejandro Garcia, Auteur ; Angels Moreno, Auteur ; Teresa Mir, Auteur ; Anna Bacardit, Auteur Année de publication : 2022 Article en page(s) : p. 251-261 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alumino-silicate de sodium
Cuirs et peaux -- Biodégradation
Cuirs et peaux de bovins
Cuirs et peaux de moutons
Essais (technologie)
Formulation (Génie chimique)
Maroquinerie
Retannage
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium
Tannage végétal
Tige de la chaussure
ZéolitesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The leather industry transforms raw hides into leather by mechanical and chemical processes. The main chemical process is the tanning in which the fibers are stabilized and cannot putrefy. To this end, different chemicals can be used that are capable of forming crosslinkages between collagen molecules. In this sense, the most used products are: chromium salts, aluminum, vegetable tannins, synthetics, aldehydes, resins and silicates. In this work, a new biodegradable tanning process based on zeolites was studied in two steps. In the first one, a tanning process for sheepskins and cow hides was developed. In the second one, three types of retanning process to obtain shoe upper, vegetable and leather goods were studied. This new system allows to obtain leather that can decompose naturally in a relative short period of time. Leather tanned with this system shows similar values to the biodegradability of pure collagen.
Specifically, with the retanning system used for shoe upper allows to obtain a 74.4% relative biodegradability compared to pure collagen.Note de contenu : - MATERIALS AND METHODS : Zeolites tanning process - Study of three types of retanning for the new tanning system
- RESULTS : Zeolites tanning process - Study of three types of retanning for the new tanning system
- Table 1 : Sheep skin tanning formulation
- Table 2 : Cow hide tanning formulation
- Table 3 : vegetable retanning formulation
- Table 4 : Leather goods retanning formulation
- Table 5 : Shoe upper retanning formulation
- Table 6 : Physical and chemical tests results for vegetable
- Table 7 : Physical and chemical tests results for shoe upper
- Table 8 : Physical and chemical tests results for leather goods
- Table 9 : Carbon content
- Table 10 : Percentage of theoretical aerobic biodegradability
- Table 11 : Percentage relative biodegradabilityDOI : https://doi.org/10.34314/jalca.v117i6.4966 En ligne : https://drive.google.com/file/d/1p5bnqsaxUqqhwhynwdWcfrEwRqUl1ZDs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37800
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 251-261[article]Réservation
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