Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing / Merih Sariisik in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 323–336 Titre : Alternative methods for transferring mosquito repellent capsules containing bio-based citronella oil to upholstery fabrics: coating and printing Type de document : texte imprimé Auteurs : Merih Sariisik, Auteur ; Gülsah Ekin kartal, Auteur ; Gökhan Erkan, Auteur ; Sadi Etkeser, Auteur Année de publication : 2022 Article en page(s) : p. 323–336 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ameublement Citronnelle Coacervation La coacervation est un phénomène colloïdal qui implique la diminution de solubilté d'un polymère dans un solvant par addition de quantité importante de différents composés : un alcool, un deuxième polymère plus soluble ou un sel (sulfate de sodium). Les molécules de polymère qui sont désolvatées coalescent et forment des gouttelettes, dites gouttelettes de coacervat. Si la coacervation se fait dans un milieu ou il y a deux phases, les gouttelettes de coacervat se regroupent à l'interface créant ainsi une membrane. Il suffit alors de durcir la membrane, de la rendre plus résistante par des réactions de crosslinking entre les molécules de polymère. Coacervation simple : La coacervation est déclenchée par addition d'un alcool concantré, par exemple de l'éthanol à 50% ou du sulfate de sodium Coacervation complexe : La coacervation complexe repose sur le même principe que la coacervation simple excepté que : le polymère en solution dans la phase continue est un polymère chargé, un deuxième polymère est utilisé pour modifier le solubilité du premier. Ce deuxième polymère porte une charge opposée à celle du premier. Encapsulation Enduction textile Ethylcellulose Insecticides Matériaux -- Imprégnation Microcapsules Morphologie (matériaux) Moustiques Textiles et tissus Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this study was to prepare insect repellent textiles and compare the application methods. Bio-based insect repellent agent citronella oil was encapsulated with ethyl cellulose shell with coacervation method. Morphological assessment showed that capsules had smooth surfaces and their shape was spherical. The homogenous size distribution of the capsules was supported and the mean particle size of the optimum formulations was almost 50 μm. Outdoor upholstery fabrics were treated with citronella capsules by coating and printing to compare the application methods. After application, the insecticide effects of the fabrics were investigated and compared with the impregnation method. Insecticide activity was evaluated against common house mosquitoes (Culex pipiens), with respect to cone bioassay of World Health Organization. Mosquitoes tended to stay away from treated fabrics, and mortality rates of mosquitos were noted as 72, 65 and 55% for printing, coating and impregnation, respectively, and the fabrics still showed repellency after five washing cycles. This study showed that the developed product might be used as an alternative to the other products in the market for avoiding mosquito-borne diseases and these results showed that capsules can be transferred by printing and coating processes when compared with the impregnation method. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the microcapsules - Mass yield of microcapsule - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Application of the microcapsules to the outdoor upholstery fabrics - Evaluation of treated fabrics - RESULTS AND DISCUSSION : Mass yield of microcapsules - Particle morphology of microcapsules - Particle size of microcapsules - Fourier transform infrared spectrophotometer (FTIR) analysis - Thermogravimetric analysis (TGA) - Evaluation of treated fabrics - Table 1 : Capsule transfer prescription for printing method - Table 2 : Capsule transfer prescription for coating method - Table 3 : Capsule transfer prescription for impregnation method - Table 4 : Mass yield of microcapsules - Table 5 : SEM photomicrographs of outdoor upholstery fabrics treated with citronella capsules with no wash, after 5 washing cycles and after rubbing - Table 6 : The ion chromatogram of citronella oil and GC-MS diagrams of outdoor upholstery fabrics treated with citronella capsules with no wash and after 5 washing cycles - Table 7 : Citronella amount in the samples as a result of GC-MS analysis - Table 8 : m2 weight changes of samples before and after washing - Table 9 : Insect repellent effect results of samples - Table 10 : Dimensional change percentage for fabrics - Table 11 : Fastness test results of capsule-transferred fabrics containing citronella - Table 12 : Color measurements of fabrics DOI : https://doi.org/10.1007/s11998-021-00529-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00529-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37161 [article]

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Artificial neural network modeling of tablet coating in a pan coater / Assia Benayache in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 2 (03/2023) . - p. 485-499 Titre : Artificial neural network modeling of tablet coating in a pan coater Type de document : texte imprimé Auteurs : Assia Benayache, Auteur ; Lynda Lamoudi, Auteur ; Kamel Daoud, Auteur Année de publication : 2023 Article en page(s) : p. 485-499 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Comprimés Enrobage pharmaceutique Ethylcellulose Matériaux -- Epaisseur Réseaux neuronaux (informatique) Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Our study decided to use the new and revolutionary approach in the field of pharmaceutical coating processes called the artificial neural network (ANN) by using the neural networks toolbox derived from the Matlab® software. The experiments were performed using tablets of Alfuzosin Chlorhydrate as a model filler, and an aqueous solution of Surelease as a polymer in different contents. The various parameters that can affect coating thickness, weight gain, and the coefficient of variation CV, such as spray rate, air pressure, solid content, speed of the drum, pan loading, and time of coating, were studied. The properties of the coated tablets were evaluated using the ANN, and both the parameters of the coating process and the properties of the coated tablets were used as a basis for optimization, as well as the choice of the optimal structure of the ANN model. It was found that the best neural network architecture had 7 neurons in the hidden layer, with a mean square error of 3.515 and a determination coefficient of nearly 1. The relative importance of each independent variable was quantified using the Garson equation. In this study, spray rate was found to have the highest impact on the properties of tablets. Note de contenu : - MATERIALS AND METHODS : Characterization of core tablets - Coating dispersion - Coating process - Characterization of the coating solution - Characterization of coating tablets - RESULTS AND DISCUSSION : Model architecture and prediction - Relative importance of input variables - The influence of parameters on the properties of coating tablets - Optimization of coating tablets - Table 1 : Effect of solids concentration on the viscosity, density, and surface tension of coating fluids measured coating - Table 2 : Variable parameters - Table 3 : ANN model's weight and bias matrix - Table 4 : Effects of coating parameters on the relative standard deviation at the final process stage - Table 5 : Ideal values of inputs, predicted and experimental values of outputs DOI : https://doi.org/10.1007/s11998-022-00683-1 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00683-1.pdf?pdf=button Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39293 [article]

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Design of leather footwear for diabetics containing chlorhexidine digluconate microparticles / Fatih Yalcin in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 3 (03/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 3 (03/2020) . - p. 79-86 Titre : Design of leather footwear for diabetics containing chlorhexidine digluconate microparticles Type de document : texte imprimé Auteurs : Fatih Yalcin, Auteur ; Huseyin Ata Karavana, Auteur ; Seda Rencber, Auteur ; Sinem Yaprak Karavana, Auteur Année de publication : 2020 Article en page(s) : p. 79-86 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antiseptiques Caractérisation Chaussures -- Conception et construction Cuir Diabète Digluconate de chlorhexidine Encapsulation Ethylcellulose Formulation (Génie chimique) Matériaux -- Imprégnation Microbiologie Particules (matières) Pieds -- Soins et hygiène Système de libération contrôlée (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : ChlorHexidine Digluconate [CHD] was encapsulated inside an ethylcellulose shell material [Aquacoat ECD], and then spray dried to produce mixed microparticles (MPs). The validity and functional quality of the resultant [CHD-MPs] were analyzed on vamp and lining leather which are used to manufacture shoes for diabetics. The morphology, efficiency of encapsulation and in vitro release characteristics of the [CHD-MPs] were optimized in order to impregnate [CHD-MPs] onto leather footwear for diabetics. Scanning electron microscopy (SEM) was used to characterize the [CHD-MPs] and the leathers treated with it. SEM images illustrated that the [CHD-MPs] were spherical, smooth in shape and adhered well to leather. In vitro CHD-release studies from its MPs, and for leather treated with it were performed in phosphate buffer saline at pH =7.2. There was an inherently controlled release behaviour of CHD for all the formulations on leather. Finally, microbiologic studies on leather treated with [CHD-MPs] were done. This study suggested that footwear containing [CHD- MPs] is/will improve the quality of daily life for diabetics. Note de contenu : - EXPERIMENTAL : Materials - METHODS : Prepration of MPs - Particle morphology of the MPs - Conditions of Ultra-Performance Liquid Chromatography (UPLC) - Encapsulation efficiency of the MPs - FT-IR analysis - In vitro drug release of the MPs - Application of the MPs on the leathers - Scanning Electron Microscopy (SEM) of the leathers with the MPs - In vitro drug release of the leathers with MPs - Microbiologic studies on leathers with MPs - RESULTS AND DISCUSSION : Particle morphology - UPLC conditions - Encapsulation efficiency - Fourier Transform Infrared Spectroscopy (FT-IR) - In vitro drug release of the MPs - SEM of the leathers with the MPs - In vitro drug release of the leathers impregnated with MPs - Microbiologic studies on leathers with MPs DOI : https://doi.org/10.34314/jalca.v115i03.1625 En ligne : https://drive.google.com/file/d/1bMgMmBeb608l3LTX7OTST1S0mMdLW9-K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33885 [article]

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Formulation development and characterization of highly water-soluble drug-loaded extended-release pellets prepared by extrusion–spheronization technique / Muhammad Iqbal Nasiri ; Rabia Ismail Yousuf ; Muhammad Harris Shoaib ; Kamran Zaheer ; Tariq Ali ; Kamran Ahmed ; Faaiza Qazia ; Sohail Anwer in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1351-1365 Titre : Formulation development and characterization of highly water-soluble drug-loaded extended-release pellets prepared by extrusion–spheronization technique Type de document : texte imprimé Auteurs : Muhammad Iqbal Nasiri, Auteur ; Rabia Ismail Yousuf, Auteur ; Muhammad Harris Shoaib, Auteur ; Kamran Zaheer, Auteur ; Tariq Ali, Auteur ; Kamran Ahmed, Auteur ; Faaiza Qazia, Auteur ; Sohail Anwer, Auteur Année de publication : 2019 Article en page(s) : p. 1351-1365 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Ethylcellulose Extrusion sphéronisation Formulation (Génie chimique) Granulés plastiques Hydrochlorure d'itopride Médicaments Système de libération contrôlée (technologie) Index. décimale : 667.9 Revêtements et enduits Résumé : The objectives of current study were (a) to prepare extended-release plain (without polymers) and matrix pellets of itopride hydrochloride (ITP) by extrusion and spheronization technique, (b) to control the initial fast release of drug from the matrix pellets by coating using ethylcellulose, Eudragit® RL/RS100 (2:1), and Kollicoat® SR 30D, and (c) to investigate the influence of different types and concentration of coating polymers on release of highly water-soluble drug. The plain pellet contained microcrystalline cellulose and lactose without polymer, whereas matrix pellet formulations were composed of hydroxypropyl methylcellulose (HPMC K4M, K15M, and K100M) and ethylcellulose (EC 7 cps). Matrix pellet formulations failed to control the drug release, up to targeted period of 12 h. Five pellet formulations—one without polymer (F1) and one from each polymer category (F4, F7, F10, and F13)—were screened out for coating using different types and levels of polymers. The DDSolver (an add-in software for MS Excel) was used to analyze the dissolution profile data for drug release kinetics. However, drug release from pellet formulation (F7) containing HPMC as a matrix former and coated with EC followed zero-order kinetics (R2 = 0.897–0.998). The release mechanism of EC-coated formulations F7, F10, and F13 was non-Fickian diffusion (anomalous transport), whereas F1 and F4 were Fickian diffusion mechanism. The stability studies of all 5% EC-coated ITP pellet formulations were conducted at room and accelerated temperature as per ICH guidelines, and results were found satisfactory. It is concluded that ethylcellulose other than Eudragit® RL/RS100 (2:1) and Kollicoat® SR 30D was found to be an excellent release controlling agent for ITP which showed good controlled-release characteristics. Note de contenu : - Materials - Methods - Physical and chemical evaluation of pellet formulations - Image analysis - In vitro drug release studies - Effect of EC coating on pellet formulations - Effect of Eudragit RL/RS 100 coating on pellet formulations - Effect of Kollicoat SR 30D coating on pellet formulations - Effect of dissolution medium on drug release - Ethylcellulose-coated pellet formulations - Eudragit RL/RS 100-coated pellet formulations - Kollicoat SR 30D-coated pellet formulations - Drug release kinetic studies - Kinetics of EC-coated pellets - Kinetics of Eudragit RL/RS100-coated pellets - Kinetics of Kollicoat SR 30D-coated pellets - Drug release mechanism - Stability studies DOI : 10.1007/s11998-019-00211-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00211-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33016 [article]

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Investigation on release of highly water soluble drug from matrix-coated pellets prepared by extrusion–spheronization technique / Muhammad Iqbal Nasiri in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 333-344 Titre : Investigation on release of highly water soluble drug from matrix-coated pellets prepared by extrusion–spheronization technique Type de document : texte imprimé Auteurs : Muhammad Iqbal Nasiri, Auteur ; Rabia Ismail Yousuf, Auteur ; Muhammad Harris Shoaib, Auteur ; Muhammad Fayyaz, Auteur ; Faaiza Qazi, Auteur ; Kamran Ahmed, Auteur Année de publication : 2016 Article en page(s) : p. 333-344 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Diffusion (physique) Enrobage pharmaceutique Ethylcellulose Extrusion sphéronisation Hydroxypropyl méthylcellulose Médicaments Polymères cristallins Polymères en médecine Index. décimale : 667.9 Revêtements et enduits Résumé : The objective was to formulate itopride HCl (ITP) extended release matrix-coated pellets by extrusion–spheronization and to investigate the influence of concentration and viscosity grade of different polymers on release of a highly water soluble drug. The matrix pellet formulations consisted of polymers (10–30%) like hydroxypropyl methylcellulose (HPMC K4M, K15M, and K100M), ethyl cellulose (EC-7 cps), microcrystalline cellulose (10–30%) and a fixed quantity of lactose (10%). The initial fast drug release from the matrix pellets was effectively controlled by coating with 5% ethyl cellulose (10 cps) dispersion. The dissolution studies of coated formulations were carried out at different pH, and data were analyzed for drug release kinetics. Scanning electron microscope was used to examine the surface morphology and cross section of pellets. Kinetics of all coated formulations were best explained by Higuchi model (R 2 = 0.94–0.99). However, HPMC matrix-coated pellets (F1, F4 and F7) also followed Baker and Lonsdale model (R 2 = 0.96–0.99), whereas, EC matrix-coated pellets (F10) followed zero-order kinetics (R 2 = 0.99). Release mechanism of all coated formulations was non-fickian. Both uncoated and coated pellets were found to be spherical. Fourier transform infrared spectroscopy was conducted on the coated formulations and no drug–excipients interaction was found. Note de contenu : - Physical and chemical evaluation of uncoated ITP matrix pellet formulation - Image analysis - Scanning electron microscopy (SEM) - Fourier transform infrared spectroscopy (FTIR) - In vitro drug release studies - Drug release kinetics - Drug release mechanism - Stability studies DOI : 10.1007/s11998-015-9749-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9749-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26118 [article]

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