Coloring of leather using henna - natural alternative material for dyeing / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 5 (05/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 5 (05/2009) . - p. 183-190 Titre : Coloring of leather using henna - natural alternative material for dyeing Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Balaraman Madhan, Auteur ; W. Madhulatha, Auteur ; Jonnalagadda Raghava Rao, Auteur ; G. A. Gasmelseed, Auteur ; S. Sadulla, Auteur Année de publication : 2009 Article en page(s) : p. 183-190 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Synthetic dyes are widely used in the leather industry; some of these are carcinogenic in nature. Environmental concern leads one to seek dye products based on natural resources, which have several advantages like less toxicity, biodegradability, etc. The research work presented in this paper focuses on an eco-friendly dyeing process of the leather using aqueous henna leaves extract that contain lawsone, 2-hydroxy 1,4 naphthaquinone, the most prominent member of alpha – hydroxynaphthaquinone, natural dye class. The aqueous extraction from the henna leaves was studied and the best extraction conditions were found to be the maceration of the ground henna leaves in water, at temperature (> 80°C) for 60 minutes in a water bath without agitation. The color of the leather had become deeper with increasing amount of henna extract and multiple colors have been obtained depending on the type of mordants used. The henna dyeing had resulted in leathers with good rub (dry and wet) and perspiration fastness characteristics, while the light fastness characteristics were found to be moderate. En ligne : https://drive.google.com/file/d/1CW56u-TUPgTxFPrHbzc3eElLF5qzkeeO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5220 [article]

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Combination tanning system for manufacture of shoe upper leathers : cleaner tanning process / A. E. Musa in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 6 (11-12/2012)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 96, N° 6 (11-12/2012) . - p. 239-245 Titre : Combination tanning system for manufacture of shoe upper leathers : cleaner tanning process Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; G. A. Gasmelseed, Auteur Année de publication : 2012 Article en page(s) : p. 239-245 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants Chaussures Déchets -- Réduction Sulfate de tétrakis hydroxyméthyl phosphonium Le sulfate de tétrakis hydroxyméthyl phosphonium est un myxobactéricide qui offre une prévention efficace contre les biofilms microbiens dans les eaux de traitement, et ce, pour une vaste gamme de micro-organismes formant des biofilms. Le sulfate de tétrakis (hydroxyméthyl) phosphonium agit principalement en augmentant la perméabilité de la membrane externe de l'enveloppe de la cellule microbienne, ce qui entraîne la libération rapide de protéines et d'autres substances cellulaires par les cellules. En outre, le sulfate de tétrakis (hydroxyméthyl) phosphonium inhibe le processus de sulfatoréduction dans les bactéries réductrices de sulfate. Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Nowadays people are seeking natural products, and advocating the preparation of leather products from green chemicals. Therefore, it becomes an important task of chemists in leather manufacture to research and develop clean and green tanning agents to replace chromium-containing tanning agents. In this study, a combination tanning process based on garad powder (Acacia nilotica sub. sp. nilotica) and tetrakis hydroxymethyl phosphonium sulphate (THPS) for the production of upper leathers is presented as a cleaner alternative. Two tanning methods, garad followed by THPS (garad-THPS) and THPS followed by garad (THPS-garad), have been tried. The combination tannage, employing 20% garad powder and 1.5% THPS results in leathers with shrinkage temperatures of 100°C. The change in the order of addition of gard and THPS showed a marginal difference in thermal stability, but significant variations were observed in the physical characteristics of leathers. The combination tanning system provides a significant reduction in the discharge of total dissolved solids in the wastewater. The characteristics of the leathers indicate that the garad-THPS combination tanning system provided leathers with good organoleptic properties and comparable strength properties. The leathers were further characterized by chemical analysis. The work presented in this paper establishes the use of garad and THPS as an effective alternative cleaner tanning method. Note de contenu : - Materials - Garad-THPS combination tannage - Measurement of hydrothermal stability of leathers - Handle and appearance of the crust leather - Physical testing - Analysis of spent liquors from tanning trials - APPENDIX : data concerning author's comment on toxicity of chromium - Toxicity of Cr(III) reference - Analysis of exhaustion of tanning spent liquors - Safe disposal method for chrome leathers - Possible risks of THPS exposure - Chemical analysis En ligne : https://drive.google.com/file/d/1ANwnCAjinHnBByzF5RxC4vYLp57WVhEW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16803 [article]

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Evaluation of antimicrobial activity of Lawsonia Inermis (Henna) against microbial strains isolated from goat skin/leather / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 5 (05/2011) . - p. 170-175 Titre : Evaluation of antimicrobial activity of Lawsonia Inermis (Henna) against microbial strains isolated from goat skin/leather Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; A. Tamil Selvi, Auteur ; Rathinam Aravindhan, Auteur ; Balaraman Madhan, Auteur ; Aafreen Fathima, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2011 Article en page(s) : p. 170-175 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Cuirs et peaux -- Conservation Cuirs et peaux de chèvres Henné Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the present work, antimicrobial activity of the aqueous extract from leaves of Lawsonia inermis (henna) has been evaluated. Two gram positive and five gram negative bacterial strains isolated from raw goat skins and three fungal species isolated from finished leathers have been utilized for the antimicrobial studies using aqueous extract from henna leaves. Gram-positive bacteria have found to be completely inhibited by henna at concentrations of 650 ppm and gram negative bacteria have been inhibited by henna concentration between 780 to 910 ppm. Growths of all fungal strains isolated have been inhibited by henna extract at a concentration of 1300 ppm. This study clearly demonstrates that henna offers good antimicrobial activity against the bacterial and fungal species. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of henna extract - Isolation and screening of bacterial strain from goat skin - Bacterial growth in the presence of henna - Isolation and screening of fungal spores - Preparation of spore suspension - Fungal growth in the presence of henna. - RESULTS AND DISCUSSION : Characterization of bacterial isolated from goat skins - Anti-bacterial activity of henna against bacterial species isolated from goat skins - Characterization of fungal species isolated from finished leather - Anti-fungal activity of henna against fungal strains isolated from leather - Effectiveness of henna as an anti-microbial agent. En ligne : https://drive.google.com/file/d/12eMBNHVROCM-K3obroF6CPEhTeG6-uCI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11591 [article]

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Henna–aluminum combination tannage : a greener alternative tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 6 (06/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 6 (06/2011) . - p. 190-199 Titre : Henna–aluminum combination tannage : a greener alternative tanning system Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; Rathinam Aravindhan, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2011 Article en page(s) : p. 190-199 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Sulfate d'aluminium Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Development of cleaner technologies for leather manufacture is imperative for the sustenance of the tanning industry. In the present study, a combination tanning system based on a henna-aluminum tannage for the production of upper leathers as a cleaner alternative is presented. Extract from the leaves of widely distributed Lawsonia inerims (Henna) from Sudan has been evaluated for its tanning characteristics in a combination tanning system based on henna and aluminum sulfate. Aluminum-henna (Al-henna) leathers tanned using 2% Al2O3; followed by 20% henna resulted in shrinkage temperature above 95°C. The uptake of henna in henna-Al tanning system with henna (20%) followed by aluminum (2% Al2O3) has been found to be better than the tanning system of Al-henna. These leathers showed compact fibre structure, indicating that the tanning process did not bring about any major change or destruction on the fibre structure of the leathers. Surface colour values of henna-Al leathers resulted in darker shades with less red and more yellow components in the crust leathers. The combination tanning system provides significant reduction in the discharge of total dissolved solids in the wastewater. Henna-Al combination tanning system resulted in leathers with good organoleptic and strength properties. The work presented in this paper established the use of henna and aluminum combination tanning system as an effective alternative cleaner tanning methodology. Note de contenu : - EXPERIMENTAL METHODS : Materials - Aqueous extraction of tannins from henna leaves - Preparation of basic aluminum sulfate solution - Henna and aluminum combination tannage - Measurement of hydrothermal stability of leathers - Physical testing and hand evaluation of leathers - Measurement of softness in leathers - Scanning electron microscopic analysis of leather samples - Analysis of spent liquors from tanning trials - Analysis of exhaustion of tanning spent liquors - Color measurements of control and experimental leathers - Evaluation of chemical constituents in leathers. - RESULTS AND DISCUSSION : Optimization of combination tanning system using henna and aluminum - Performance of leathers organoleptic properties of leathers - Strength characteristics of experimental and control crust leathers - Softness measurements of henna-Al tanning system - Scanning electron microscopic analysis of leather samples - Reflectance measurements - Effect of surface color on control and experimental leathers - Chemical analysis of the crust leather - Environmental tolerability and spent liquor analysis. En ligne : https://drive.google.com/file/d/1Gf6K3aai4yAs469aF02XfUDmHP8G4M0Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11718 [article]

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Henna extract : Can it be an alternative retanning agent ? / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 6 (06/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 6 (06/2008) . - p. 188 - 193 Titre : Henna extract : Can it be an alternative retanning agent ? Type de document : texte imprimé Auteurs : A. E. Musa, Auteur ; G. A. Gasmelseed, Auteur ; S. Sadulla, Auteur ; W. Madhulatha, Auteur ; Balaraman Madhan, Auteur Année de publication : 2008 Article en page(s) : p. 188 - 193 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Extract from the leaves of lawsonia inermis (henna), widely distributed in Sudan, has been evaluated for its utilization in the retanning of the leather and presented in this paper. Leaves of henna have been extracted for 1 hour with distilled water (1:10 w/v) at temperature above 80°C. The henna extract prepared has been used for the retanning of wet blue leathers. The effectiveness of henna extract in retanning of wet blue leathers has been compared with wattle retanning. The organoleptic properties of the leathers viz. softness, fullness, grain smoothness, grain tightness (break), general appearance, uniformity of dyeing of henna retanned leather have been evaluated in comparison with wattle retanned leathers. Henna retanning resulted in leathers with good grain tightness. Dyeing characteristics of henna retanned leathers have been found to be better than wattle retanned leathers. Also physical strength characteristics, shrinkage temperature and economic viability were noted. The effluent arising from this retanning system has been analyzed for its environmental impact. En ligne : https://drive.google.com/file/d/1PjhdcJB92GZqU_JJ2W2U1YWRNlL1dv2g/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2562 [article]

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Studies on combination tanning based on henna and oxazolidine / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)  

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Studies on the henna-glutaraldehyde combination tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)  

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Upgrading of rural garad-tanned crust leathers / A. E. Musa in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 96, N° 1 (01-02/2012)  

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