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Microencapsulation of essential oils for antimicrobial foot bed / Jaffrin Benseelia B. in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 4 (04/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 4 (04/2024) . - p. 155-164 Titre : Microencapsulation of essential oils for antimicrobial foot bed Type de document : texte imprimé Auteurs : Jaffrin Benseelia B., Auteur ; Chris Felshia S., Auteur ; John Sundar V., Auteur ; Gnanamani A., Auteur Année de publication : 2024 Article en page(s) : p. 155-164 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Caractérisation Chaussures Chaussures -- Matériaux Cuirs et peaux Emulsions Encapsulation Huiles essentielles Matières plastiques Microcapsules Semelles Textiles et tissus Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The present study emphasizes the microencapsulation of mixture of three essential oils and explores its application in footwear industry. In brief, essential oils of Thymus zygis, Citrus limoniumand Cinnamomum cassia microencapsulated as per the standard protocol followed elsewhere. The obtained microcapsules characterized, fused on to the foot bed materials of footwear using hand sprayer and assessed the antimicrobial property after airdrying. The foot bed material chosen for the present study includes leather, textile and polymer. Representative standard Gram -positive and Gram – negative bacterial species, and few of the fungal species isolated from leather samples are the test organisms used in the present study. Results revealed the size of the microcapsules as 25-60 nm. Optical and Scanning electron micrographs suggested the spherical nature of the capsules. Antibacterial and antifungal activity studies on microcapsules as such and foot bed materials before and after the incorporation of microcapsules infers the complete inhibition of microbial growth in microcapsules incorporated foot bed materials. The stability studies on the spray coating of microcapsules on to the foot bed materials reveal more than six months stability. SEM analysis of fungal species before and after exposure to microcapsules suggested the thinning of filaments and the natural mechanism of growth inhibition. In conclusion, coating of microencapsulated essential oils adds antimicrobial property to the foot bed materials. Note de contenu : - Chemicals - Emulsion preparation and encapsulation - Characterization of microcapsules - Size distribution of microcapsules - Storage, Temperature and pH stability assessments - Selection of microbial species - Antimicrobial activity of plain essential oils and microcapsules - Preparation of microcapsules fused textile, leather and polymeric materials - Antimicrobial activity of microcapsules fused experimental materials and the prepared foot-bed : Plate assay - Direct method - Hemocompatibility Studies - Table 1 : Rating on microbial growth analysis on test samples - Table 2 : Fungal growth ratings of the experimental samples incorporated with the microcapsules prepared from mixed herbal oils DOI : https://doi.org/10.34314/91r1qz34 En ligne : https://drive.google.com/file/d/19FrM8dkyJ12fwMLvJFiBIRNZ7LClv79C/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40823 [article]

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Decoding source of leather odor : a quantitative analysis with heracles NEO / Haonan Shi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 4 (04/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 4 (04/2024) . - p. 165-173 Titre : Decoding source of leather odor : a quantitative analysis with heracles NEO Type de document : texte imprimé Auteurs : Haonan Shi, Auteur ; Haiming Cheng, Auteur ; Jin Zhou, Auteur Année de publication : 2024 Article en page(s) : p. 165-173 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse quantitative (chimie) Composés organiques volatils -- Analyse Cuir Cuirs et peaux de bovins Cuirs et peaux de moutons Odeurs -- Analyse Olfactométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather products are widely used in our daily life and in close contact with users, but the pleasant feeling during its usage is severely affected by the odor volatilized from the leather surface. In this study, a quantitative analysis method to investigate the differences in the odor profiles among four types of leather was proposed. The primary olfactory constituents of four leather types were examined by Heracles NEO ultra-fast gas-phase electronic nose, including Principal Component Analysis (PCA) and Discriminant Factor Analysis (DFA). In chrome-tanned cattle hide leather, the substance with the highest content was 2,4-Dinitrotoluene, while methyl dodecanoate was the predominant compound in chromefree cattle hide leather. Notably, chrome-tanned sheepskin leather exhibited higher levels of dodecanal, clopyralid, n-octylbenzene, propyl cinnamate, and 3-methylhexadecane. Similarly, chrome-free sheepskin leather contained higher levels of dodecanal, clopyralid, n-octylbenzene, propyl cinnamate, 3-methylhexadecane, and tetradecanol. These findings indicate that each of the four types of leather possesses distinctive compounds, while also sharing common compounds. Furthermore, the results indicate that radar plots along with PCA and DFA analyses can effectively differentiate between the four types of leather. Note de contenu : - EXPERIMENTAL : Materials and sampling process - Heracles NEO instrumentation and settings - Data analysis and comparison - RESULTS : Qualitative analysis of volatile compounds by Heracles NEO e-nose - Chemical pattern recognition analysis - PCA principal component analysis - DFA discriminant factor analysis - Table 1 : The set parameters of Heracles NEO - Table 2 : Possible volatile compounds identified in CTCL and relative contents - Table 3 : Possible volatile compounds identified in CFCL and relative contents - Table 4 : Possible volatile compounds identified in CTSL and relative contents - Table 5 : Possible volatile compounds identified in CFSL and relative contents DOI : https://doi.org/10.34314/yv80gx56 En ligne : https://drive.google.com/file/d/1zb1DL6sd8C_ks6W60OR52x0MHQ4lDigX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40824 [article]

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I PointNet++ : Improved pointnet++ for segmentation and localization of leather grasp points / Jin Guang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 4 (04/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 4 (04/2024) . - p. 174-183 Titre : I PointNet++ : Improved pointnet++ for segmentation and localization of leather grasp points Type de document : texte imprimé Auteurs : Jin Guang, Auteur ; Ren Gonchang, Auteur ; Huan Yuan, Auteur ; Sun Jiangong, Auteur Année de publication : 2024 Article en page(s) : p. 174-183 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Manutention -- Appareils et matériel Point de préhension Robotique Robots industriels Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In order to achieve accurate identification and positioning of leather grasp points during the process of robot grasp and spreading leather, this paper proposes a leather grasp point segmentation and positioning method based on improved PointNet++(IPointNet++). Taking leather in its natural falling state as the research object, a depth camera is used to collect point cloud data of the leather. Firstly, the preprocessing of leather point clouds is completed by removing background point clouds based on PassThroughFilter and eliminating noise based on Statistics Filter. Secondly, the octree sampling method is used to replace the farthest point sampling method of the original PointNet++, which is adapted to the nonrigid deformation characteristics of the leather itself. Thereby, the entire leather is divided into two parts: the main body and the grasp area. Lastly, the three-dimensional coordinates of the leather grasp points are obtained by solving the centroid of the point cloud data in the leather grasp area grasp. In the segmentation experiments, the improved PointNet++ has raised the mIoU by 11.8% and 2.5% comparing with PointNet and PointNet++ respectively, and the OA by 6.1% and 1.1%. In the grasp experiments, the success rate of leather grasp points identification grasp is 93.33%, and the success grasp rate grasp is 82.14%. The experimental results show that the proposed method has higher segmentation accuracy and good applicability. Note de contenu : - MATERIALS AND METHODS : Data acquisition - Point cloud preprocessing - Data Labeling - IMPROVEMENT OF THE POINTNET++ MODEL (I PointNet++) : Localization of leather frasp points - EXPERIMENTAL PROCESS AND RESULT ANALYSIS : Experimental conditions - Segmentation experiment - Grasp localization experiment - Table 1 : Experimental configuration - Table 2 : Training parameter settings - Table 3 : Segmentation accuracy results (%) - Table 4 : Test data for grasp localization experiment DOI : https://doi.org/10.34314/9y3ykt93 En ligne : https://drive.google.com/file/d/1dKFXpXeaLCElVID0fjTHz0xOudBN1eLf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40825 [article]

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Examination of haloversatile bacteria on salted goatskin and inactivation of haloversatile bacteria via direct electric current / S. Kose in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 4 (04/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 4 (04/2024) . - p. 184-197 Titre : Examination of haloversatile bacteria on salted goatskin and inactivation of haloversatile bacteria via direct electric current Type de document : texte imprimé Auteurs : S. Kose, Auteur ; P. Yilmaz, Auteur ; Meral Birbir, Auteur ; Yasar Birbir, Auteur Année de publication : 2024 Article en page(s) : p. 184-197 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Comptage Bactéries -- Identification Bactéries haloversatiles Caractérisation Courants continus Cuirs et peaux -- Analyse Cuirs et peaux -- Détérioration Cuirs et peaux de chèvres Enzymes microbiennes Peaux salées Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Haloversatile bacteria are among the commonly found microorganisms that have the potential to damage hides and skins in the leather industry. Therefore, the objective of this study was to investigate the presence of haloversatile bacteria on salted goatskins, to characterize these microorganisms through the use of molecular and conventional test methods, to detect their impact on the skins, and finally find an effective solution to inactivate these microorganisms. Haloversatile bacteria were common inhabitants at salted goatskin samples obtained from the Tuzla Organized Leather Industry Zone in Türkiye. Total numbers of haloversatile bacteria, proteolytic haloversatile bacteria, and lipolytic haloversatile bacteria on ten salted goatskin samples ranged from 7×104 to 2.7×105 CFU/g, 1×104 to 8×104 CFU/g, and 1×104 to 1.3×105 CFU/g, respectively. In the present study, 88% of the isolates were protease-positive, 69% were lipase-positive, 8% were xylanase-positive, 27% were caseinase-positive, 23% were amylase-positive, 8% were DNase-positive, 31% were cellulasepositive, 54% were urease-positive, 100% were catalase-positive, and 54% were oxidase-positive. The bacterial isolates showed positive reactions for the utilization of different amino acids such as glycine, L-cysteine, L-proline, and L-threonine, having the highest rates of 88%, 80%, 80%, and 80%, respectively. However, L-histidine had a lower positive reaction rate of 31%. The halophilic bacterial isolates exhibited positive reactions for the utilization and acid production from different types of sugar, with glucose having the highest positive reaction rate of 81%, followed by maltose at 73%, xylose at 58%, galactose at 46%, and lactose at 42%. Haloversatile enzymeproducing bacteria were identified using biochemical and molecular methods, resulting in the identification of 17 different species. Micrographs obtained from the scanning electron microscope revealed the damage inflicted on the fresh goatskin structure by haloversatile bacteria. A direct electric current of 2.2 A was applied to the mixed culture of haloversatile bacteria for 25 minutes to find an effective inactivation method. The total count of the mixed culture of haloversatile bacteria decreased from 7.3×106 CFU/mL to 4 CFU/mL within 16 minutes. All seventeen haloversatile bacteria in the mixed culture were killed within 19 minutes. Note de contenu : - Collection of salted goatskin samples from tanneries and measurement of pH values - Determination of the total numbers of haloversatile bacteria, proteolytic, and lipolytic haloversatile bacteria on the salted goatskin samples - Isolation of haloversatile bacteria - Haloversatile bacterial identification - Determination of optimal growth conditions for haloversatile bacteria - Investigation of enzymatic properties of haloversatile bacteria - Utilization of different amino acids and carbon sources by haloversatile bacteria - Examination of the damage caused by enzyme-producing haloversatile bacteria on the goatskin sample using scanning electron microscope - Destruction of haloversatile bacteria using electric current - Examination of haloversatile bacterial cells before and after treatment with direct electric current using scanning electron microscopy - Table 1 : The salted skin sample codes, ph of salted skin samples, total haloversatile, total proteolytic haloversatile, total lipolytic haloversatile bacterial counts on salted goatskin samples (CFU/g) - Table 2 : The isolate codes, phylogenetically similar species, length (bp), similarity (%), accession number of haloversatile isolates obtained from salted goatskin samples - Table 3 : The effects of pH, NaCl contents and temperature values on the growth of haloversatile bacterial isolates - Table 4 : Enzymatic characteristics of haloversatile isolates obtained from salted goatskin samples - Table 5 : Utilization of different sugars and amino acids by haloversatile isolates - Table 6 : The pH values, temperature, voltage and the total counts (CFU/mL) of enzyme producing haloversatile bacteria in the direct electric current treatment En ligne : https://drive.google.com/file/d/1WN-TWYW9l8-TRlCWsX0w8KSiISJyWWKx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40826 [article]

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