Avoiding the production of polluting and toxic chemicals in the tanning process / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 10 (10/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 10 (10/2021) . - p. 359-367 Titre : Avoiding the production of polluting and toxic chemicals in the tanning process Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; Patricia Rojas, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 2021 Article en page(s) : p. 359-367 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire). Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia) Emission de polluants Epilage Produits chimiques -- Suppression ou remplacement Tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Polluting and potentially toxic chemicals are used in tanning. Sodium sulfide/hydrosulfide are used when the hides are unhaired. These chemicals can be transformed into hydrogen sulfide with a simple change of pH. This gas is highly toxic and is the recurring cause of many deaths and accidents due to suffocation of workers in tanneries around the world. The basic salts of chromium III are the most used chemical to tan. The chromium III used can be transformed by oxidation, even once the leather transformed into a consumer good (shoes, for example), in chromium VI, which is carcinogenic. Both chemicals are present in process floats, in residual floats and in solid waste generated. Chromium III is also present in manufactured leathers. This article aims to describe the problems associated with the use of the aforementioned hazardous materials and deepen the possibility of using less toxic alternative processes to tan. The designed process allows to significantly reduce the pollutant load of the discharged wastewater, facilitates the reuse of the solid waste generated and clearly improve the safety of people at work. Note de contenu : - Materials - Preliminary operations - Experimental design - Table 1 : Experimental design - Table 2 : Unhairing formulations - Table 3 : Tanning with different vegetable extracts - Table 4 : Physical tests results - Table 5 : Analysis of variance for tear load (N/mm) DOI : https://doi.org/10.34314/jalca.v116i10.4617 En ligne : https://drive.google.com/file/d/1HpFtjhrwvoRFUR4Okm0XXsychnrgL1F4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36407 [article]

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A bibliometric study of the unhairing and liming of the leather tanning process / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 11 (11/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 11 (11/2022) . - p. 465-479 Titre : A bibliometric study of the unhairing and liming of the leather tanning process Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; Patricia Cebollada, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 2022 Article en page(s) : p. 465-479 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bibliométrie Epilage Pelage Publications scientifiques Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Unhairing and liming are the most polluting operations of the leather tanning process. Over the years, this sector has been investigated increasingly. Hence, this paper aims to explore and analyze the scientific activity of this field of research with a new view, applying bibliometrics techniques. The method of the study is based on a search and collection of publications indexed in Scopus. Subsequently, bibliometric data were extracted from the corresponding publications. Graphics and bibliometric maps were made to obtain quantitative results and the relationships between countries, authors, journals, and keywords. The results show an upward trend over the last 100 years or so, where the topic of most of the publications has reversed from being purely about engineering and process to focus on the big environmental issue generated by traditional unhairing. At the same time, research in this field has shifted to countries with the biggest tanning industry, such as China and India. In conclusion, bibliometrics has been a good method to know the current state of scientific literature and the timeline of this field of research, which will allow for a deepening in alternative methods to traditional unhairing and advance of the environmental concern caused by these polluting operations. Note de contenu : - Quantitative analysis. Trends and distribution of publications - Co-authorship analysis - Co-citation analysis - Keyword co-occurrence analysis - Table 1 : Top journals with at least 3 publications on the topic - Table 2 : Top 10 institutions and their corresponding country - Table 3 : List of the top 10 authors including institution, country, total publications on scopus and h-index - table 4 : Average year of publication of some keywords according to their frequency of occurrence in publications DOI : https://doi.org/10.34314/jalca.v117i11.6293 En ligne : https://drive.google.com/file/d/1EuiBdAb4rF1XZXIHL8aSaAWtcpYlfkNv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38340 [article]

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Chemical modification of protein products isolated from chromium-containing solid tannery waste and resultant influence on physical and functional properties / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LCIV, N° 5 (07/1999) . - p. 171-181 Titre : Chemical modification of protein products isolated from chromium-containing solid tannery waste and resultant influence on physical and functional properties Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 1999 Article en page(s) : p. 171-181 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Samples of gelatin extracted from chromium-containing leather waste by different protocols were chemically modified with glutaraldehyde, glyoxal and carbodiimide and compared to similarly modified commercial gelatins. Glutaraldehyde appeared to be a very efficient cross-linker, giving gels that would not melt at 70 oC with the addition of only 2% glutaraldehyde but with a decrease in their rigidity when the amount of glutaraldehyde was increased. Foaming tests on these samples demonstrated that the addition of low amounts of glutaraldehyde increased both the foam capacity and the foam stability of the gelatins. Glyoxal modification did not have such an effect on the gel strength and melting point of the samples. It did not increase foam capacity but did increase foam stability, it gave better adhesive properties to these gelatins and it did increase dramatically their emulsification capacity. Carbodiimide had similar effects on gel strength as glyoxal; it did increase dramatically the melting point of commercial gelatin but had no effect on the melting point of the extracted gelatins. It decreased the foam and adhesive properties of all the samples, but it did increase the emulsification capacity of the extracted gelatins. The study demonstrates that the functional properties of chemically modified gelatin extracted from chromium-containing leather waste were changed, and, as a result, new uses could be identified for these value-added products. Note de contenu : - EXPERIMENTAL : Material - Chemical modification - METHODS : Analyses - Gel strenght - Melting point - Foamability - Adhesive test - Emulsion capacity En ligne : https://drive.google.com/file/d/1lbZ5PcQBffG9si0Z7QXouceREnsJPz67/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4452 [article]

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A cleaner process for short-term preservation of hides using wheat bran / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 1 (01/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 1 (01/2022) . - p. 19-27 Titre : A cleaner process for short-term preservation of hides using wheat bran Type de document : texte imprimé Auteurs : Josep Maria Morera, Auteur ; Esther Bartoli, Auteur ; Rafael Fernandez, Auteur ; Luisa F. Cabeza, Auteur Année de publication : 2022 Article en page(s) : p. 19-27 Langues : Américain (ame) Catégories : Cuirs et peaux -- Conservation Essais (technologie) Son de blé Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salting is the most common method to preserve hides and skins. However, this preservation system requires the generation of large amounts of contaminated salt, approximately three million tons per year. In recent years several researchers have suggested different methods for the short-term preservation of hides using plant-based formulations, which either minimize or even completely eliminate the use of salt in the process. In this work, the possibility of using wheat bran for this purpose was studied. Two methods of application (dry and aqueous solution) have been developed. They enable the preservation of hides for one month, reducing by half the salt used in the preservation stage without undermining the quality of the final leather. These two methods contribute to the improvement of the overall sustainability of the tanning process. With dry application, the use of salt is avoided and preservation occurs because the hide is dried. The application in aqueous solution (10% wheat bran) requires its previous hydrolysis and a minimum amount of salt (10ºBé). The preservation occurs because the acidity of the hide is increased. Note de contenu : - EXPERIMENTAL : Materials - Methodology - RESULTS AND DISCUSSION : Test 1. Potential of wheat bran as a hide preservation - Test 2. Influence of saline concentration on the preservation of hides - Test 3. Influence of maceration temperature and the moment in which the salt is added on the preservation of the hides - Test 4. Comparison of the effectiveness of the preservation methods - Test 5. Effect of the type of preservation on the physical properties of the final chromium-tanned leather - Environmental benefits - Table 1 : Summary of tests performed during the research - Table 2 : Comparative pattern. Content of each tube - Table 3 : Comparison of the bacterial growth using the pattern tubes - Table 4 : Results of physical tests DOI : https://doi.org/10.34314/jalca.v117i1.4695 En ligne : https://drive.google.com/file/d/1JJUWx52QfoXLp1mhMV4C2Bii29yf909e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37027 [article]

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Computer-assisted method to measure the adhesive properties of hydrolysis products from collagen / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 2 (02-03/1997)

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCII, N° 2 (02-03/1997) . - p. 28-37 Titre : Computer-assisted method to measure the adhesive properties of hydrolysis products from collagen Type de document : texte imprimé Auteurs : Maryann M. Taylor, Auteur ; Luisa F. Cabeza, Auteur ; William N. Marmer, Auteur ; Eleanor M. Brown, Auteur Année de publication : 1997 Article en page(s) : p. 28-37 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Historically, hydrolysis products from collagen, such as technical gelatin and animal glue, were used as adhesives. With the advent of synthetic adhesives, those products from collagen became less popular. Because of the "green revolution" over environmental concerns, animal glues are again becoming appealing. Characterization of adhesives has, at best, been subjective. The Jellygram and/or the bloom values are presently being adopted by adhesive companies, that utilizes a commercially available computerized texture analyzer. The advantages of this method are that it not only measures the tackiness but also the work of adhesion, and it requires onlya small amount of sample. Subtle differences in the products that cannot be measured by the prevailing technology can be determined by this technology. Furthermore, analysis of the standard eviation and coefficient of variation shows that the method has good precision when relatively simple guidelines are followed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7684 [article]

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Economic viability of using biogas from tannery wastes in molten carbonate fuel cells / Albert Castell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 94, N° 3 (05-06/2010)  

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Enzymatic modification of hydrolysis products from collagen using a microbial transglutaminase. I. Physical properties / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)  

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Evaluation of the energy savings when using vacuum eryers with total thermal energy recovery in tanneries / Josep Maria Morera in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 12 (12/2008)  

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Extraction of value added byproducts from the treatment of chromium containing collagenous leather industry waste / Maryann M. Taylor in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)  

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Functional properties of hydrolysis products from collagen / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 2 (02-03/1998)  

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Influence of pepsin and trypsin on chemical and physical properties of isolated gelatin from chrome shavings / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCII, N° 8 (10/1997)  

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Isolation of protein products from chromium-containing leather waste using two consecutive enzyme and purification of final chromium product : pilot plant studies / Luisa F. Cabeza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 83, N° 1 (01-02/1999)

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Minimization of industrial wastes-adding value to collagenic : Adding value to collagenic materials procter memorial lecture / J. Cot in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 3 (05-06/2003)  

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Potential applications for gelatin isolated from chromium-contaning solid tannery waste : microencapsulation / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)  

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Process simulation and cost estimation of treatment of chromium-containing leather waste / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 10 (12/1998)  

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Processing of collagenic residues. Isolation of gelatin by the action of peroxochromates / Jaime Cot in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 4 (06/1999)  

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Renewable energy to power tanneries / Luisa F. Cabeza in LEATHER INTERNATIONAL, Vol. 212, N° 4805 (11-12/2010)  

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The effect of surfactant on the isolation of protein products from chromium-containing solid tannery waste. Influence on the process and on the chemical, physical and functional properties of the resultant gelatin / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)  

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Treatment of sheepskin chrome shavings. Isolation of high value protein products and reuse of chromium in the tanning process / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 7 (09/1999)  

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Use of alternative energy sources in tanneries / Luisa F. Cabeza in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 3 (05-06/2007)  

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