Analysis of hydroxyproline in collagen of pigskin tissue by low pressure ion chromatography separation and conductivity detection / Hong Dai in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 4 (07-08/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 4 (07-08/2005) . - p. 145-148 Titre : Analysis of hydroxyproline in collagen of pigskin tissue by low pressure ion chromatography separation and conductivity detection Type de document : texte imprimé Auteurs : Hong Dai, Auteur ; Zongcai Zhang, Auteur ; Subo Fan, Auteur ; Zhang Xinshen, Auteur Année de publication : 2005 Article en page(s) : p. 145-148 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides aminés Les acides aminés (ou aminoacides) sont une classe de composés chimiques possédant deux groupes fonctionnels : à la fois un groupe carboxyle –COOH et un groupe amine –NH2. Parmi ceux-ci, les acides α-aminés se définissent par le fait que leur groupe amine est lié à l'atome de carbone adjacent au groupe acide carboxylique (le carbone α), ce qui leur confère la structure générique H2N–CHR–COOH, où R représente la chaîne latérale, qui identifie l'acide α-aminé. Les acides α-aminés jouent un rôle fondamental en biochimie comme constituants élémentaires des protéines : ils polymérisent en formant des liaisons peptidiques qui aboutissent à de longues chaînes macromoléculaires appelées peptides. Chlorhydrique, Acide Chromatographie Collagène -- Analyse Cuirs et peaux -- Analyse Cuirs et peaux de porcs Hydrolyse Hydroxyproline Séparation (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A simplified method has been developed to determine the hydroxyproline concentration in pigskin collagen. The sample was prepared by hydrolyzing pigskin tissue collagen for 24 hours overnight at 110°C in 6M/Lhydrochloride acid followed by determination by low pressure ion chromatography separation and conductivity detection without derivatization. Hydroxyproline was separated and detected successfully using a 5mm x 100mm long column filled with 25μm-30μm size and 0.02 mmol/g capacity cationic exchange resin. The elution solution was 0.8mmol/L nitric acid solution and the flow rate was 0.6ml/min. The concentration of the hydroxyproline sample was calculated by the five points work curve of standard stock solution. The result shows that the concentration of hyp in the sample was 3.16 ± 0.28 mmol/L. The RSD of the method was 4.63-8.97%. The recovery percentage of hyp added to the sample was 92.5-105.5%. Note de contenu : - EXPERIMENTAL METHODS : Reagents and chemicals - Apparatus - Optimum chromatography parameters - RESULTS AND DISCUSSION : Determination of amount of hydrochloric acid needed for amino acid hydrolysis - Sample preparation - Standard curve preparation - Determination of hydroxyproline in sample - Recovery test - Determination of accuracy - Table 1 : Optimum chromatography parameters of amino acid analysis - Table 2 : Relationship between concentration of hydroxyproline and peak height - Table 3 : Concentration of hydroxyproline in samples - Table 4 : Recovery percentage of the determination for Hyp - Table 5 : Result of accuracy experiment En ligne : https://drive.google.com/file/d/14NZOFmgg0hcKd7hJDWqB0iiZqROk8HAy/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39245 [article]

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Analysis of the processing histology of mink skin / Zhang Meina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 2 (02/2019) . - p. 62-68 Titre : Analysis of the processing histology of mink skin Type de document : texte imprimé Auteurs : Zhang Meina, Auteur ; Yao Tian, Auteur ; Yongguang Wang, Auteur ; Zongcai Zhang, Auteur Année de publication : 2019 Article en page(s) : p. 62-68 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux de vison Peau -- Histologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Most people around the world regard mink skin as luxurious commodities, since the mink hair is generous and guard hair length is moderate. However, a variety of reasons will attribute to hair loss or orientation phenomenon of upper hair in the processes. The paper studied the processing histology of mink in the processing, which could build a scientific foundation to optimize the process, improve the technical skills and improve product quality. Mink skin samples used in the experiment were taken from soaking, degreasing, bating, pickling, and tanning processes. The photomicrographs were observed by bio-optical microscope. Besides, samples were performed by frozen section method and stained with iron hematoxylin staining method as well as Gill modified hematoxylin staining method. It is found that the hair follicles of the mink were distributed irregularly in the form of compound hair follicles or individual hair follicles. Mink fat glands were very developed. In other words, each hair follicle generally was surrounded by a pair of fat glands. With the increase in degreasing time, the number of fat cells in the fat glands was reduced and the fibers around the hair follicles were initially dispersed. The voids between the collagen fibers became larger and more fully loose after the processes of bating and pickling. In addition, the collagen fiber wove more orderly and closer by tanning. In the case of pickling and bating, most of the hair follicle openings were opened, which could abate the chained force between hair and the follicles and/or the dermal papilla. Note de contenu : - EXPERIMENTAL : Materials and instruments - Sampling - Fixation - Sectioning - Iron hematoxylin staining - Gill modified hematoxylin staining - RESULTS AND DISCUSSION : Soaking tissue sections - Degreasing tissue sections - Bating tissue sections - Pickling tissue sections - Tanning tissue sections - Slicing tissue section En ligne : https://drive.google.com/file/d/13SH9Lvq4FzElR03cn7G0wA6aYgHwa4Uh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31719 [article]

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Effects of a clean subcritical degreasing system on wool fibers / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 5 (05/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 5 (05/2021) . - p. 162-167 Titre : Effects of a clean subcritical degreasing system on wool fibers Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Yinxuan Wang, Auteur ; Zongcai Zhang, Auteur ; Hong Dai, Auteur Année de publication : 2021 Article en page(s) : p. 162-167 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dégraissage (nettoyage) Laine brute Pentane Le pentane est un alcane linéaire de formule C5H12. Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone. Utilisations : Le pentane est un solvant couramment utilisé en chimie organique. Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia) Stabilité thermique Thermogravimétrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It makes sense to use environmentally friendly methods of degreasing in fur-making process. In this study, subcritical n-pentane was used to degrease wool fibers. Thermogravimetric analysis (TGA) was used to observe and analyze the properties of the subcritical n-pentane degreased wool fibers. The results showed that the thermal stability of the fibers increased. Fourier Transform Infrared (FTIR) spectroscopy was used to analyze the structural changes of macromolecular chains in wool fibers. It was found that when the pressure was higher than 0.4 MPa, the wool fibers underwent a conformational change with the α-helix changing to β-folding. If the pressure was as high as 0.6 MPa, the disulfide bonds in the wool fibers scale layer appeared to break. X-ray powder diffraction experiment was used to study changes in wool fiber aggregation morphology. It was demonstrated that the crystalline zone of wool fibers changed and the fibers index grew, from 22.89% to 30.19%. Field emission scanning electron microscopy and ultra-depth of field microscopy was used to analyze changes in the surface morphology of wool fibers. The results suggested that after the treatment, the wool fibers were not damaged and the impurities on the wool surface were reduced. Note de contenu : - EXPERIMENTAL : Materials - Sample preparation - The experimental process - CHARACTERIZATION TECHNIQUES : Degreasing rate - Change in thermal stability in wool - Structural changes in wool fibers macromolecular chains using Fourier Transform Infrared (FTIR) spectroscopy - Structural changes in the aggregation state of wool fibers ssing X-Ray powder diffraction - Morphological changes on the wool surface using Scanning Electron Microscopy and ultra-depth microscopy - RESULTS AND DISCUSSION : Effect of degreasing - Effect of subcritical n-pentane treatment on thermal stability of wool fibers - Effect of subcritical n-Pentane treatment on macromolecular chain structure of wool fibers - Table 1 : Infrared characteristic absorption band of wool fibers22 - Table 2 : Relative intensity of some characteristic peaks of wool fibers after subcritical n-pentane treatment at different pressure DOI : https://doi.org/10.34314/jalca.v116i5.4292 En ligne : https://drive.google.com/file/d/1OUz4ZlvKlN2y_DdhPCN1R7GO6Ej2Oyvu/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35759 [article]

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Study on the degreasing of sheep skin using subcritical fluid extraction / Qiao Xia in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 2 (02/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 2 (02/2021) . - p. 39-45 Titre : Study on the degreasing of sheep skin using subcritical fluid extraction Type de document : texte imprimé Auteurs : Qiao Xia, Auteur ; Zhang Meina, Auteur ; Bo Mao, Auteur ; Hong Dai, Auteur ; Zongcai Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 39-45 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Cuirs et peaux -- Analyse Cuirs et peaux -- Dégraissage Cuirs et peaux de moutons Extraction (chimie) Peau -- Histologie Peaux brutes Pentane Le pentane est un alcane linéaire de formule C5H12. Le terme pentane désigne aussi par extension abusive17 les trois isomères C5H12 : le n-pentane, le 2-méthylbutane ou isopentane et le 2,2-diméthylpropane ou néopentane. Ces diverses molécules comportent toutes cinq atomes de carbone. Utilisations : Le pentane est un solvant couramment utilisé en chimie organique. Propriétés chimiques : Le pentane brûle dans l'air selon la réaction : C5H12 + 8O2 —> 5CO2 + 6H2O (Wikipedia) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Degreasing is one of the important processes for the production of leather and fur. This study aimed to develop a degreasing method using subcritical n-pentane. Sheep skin was chosen as raw skin for this investigation. The best possible combination of degreasing parameters was found using single factor experiment and response surface methodology. The effects of temperature and pressure on the degreasing efficiency were evaluated further with histological analysis. The results showed that the optimum degreasing parameters were a degreasing time of 58 min, pressure of 0.45 MPa, temperature of 41.0°C and thus yielded a degreasing rate of 52.46％ theoretically and 51.46% experimentally. Histological sections showed that the degreasing effect of subcritical n-pentane was quite significant and the lipid droplets around the hair follicles were dramatically reduced. It has been proven that subcritical n-pentane degreasing is an effective technique for sheep skin degreasing. Note de contenu : - EXPERIMENTAL : Materials & instruments - Experiment procedure - Sample preparation - Degreasing with subcritical n-pentane extraction - Single factor experiment design of subcritical n-pentane degreasing process - Optimization design of subcritical n-pentane degreasing process by RSM - Characterization of degreasing effect - Histological analysis of degreased skin - RESULTS AND DISCUSSION : Effect of degreasing - Table 1 : Single factor experiment scheme - Table 2 : Factor table for single factor experiment - Table 3 : Response surface experiment level and coding - Table 4 : Experimental scheme of response surface methodology and response value of degreasing rate - Table 5 : Analysis of variance of regression model of subcritical n-pentane degreasing - Fig. 1 : The sheep skin degreasing procedure with subcritical n-pentane - Fig. 2 : Single factor results - Fig. 3 : Residuals - Fig. 4 : Response surface graph and contour map - Fig. 5 : Histological photomicrographs of degreased skin under different temeprature - Fig. 6 : Histological photomicrographs of degreasing skin under different pressure DOI : https://doi.org/10.34314/jalca.v116i2.4234 En ligne : https://drive.google.com/file/d/1fFEfsYfERS70jjgP-KtN7vOTfnm400QO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35307 [article]

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Study on the degreasing of sheepskin by subcritical CH2Cl2 / Shanshan Yu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 2 (03-04/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 2 (03-04/2021) . - p. 72-76 Titre : Study on the degreasing of sheepskin by subcritical CH2Cl2 Type de document : texte imprimé Auteurs : Shanshan Yu, Auteur ; Yingxuan Wang, Auteur ; Meina Zhang, Auteur ; Hong Dai, Auteur ; Qiang Liu, Auteur ; Zongcai Zhang, Auteur Année de publication : 2021 Article en page(s) : p. 72-76 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Dégraissage Cuirs et peaux de moutons Dichlorométhane Le dichlorométhane (DCM) ou chlorure de méthylène (dénommé R30 dans la liste des gaz fluorés et frigorigènes), est un composé chimique se présentant à température ambiante comme un liquide incolore et volatil émettant une odeur douceâtre relativement forte pouvant mettre certaines personnes mal à l'aise. Son odeur est perceptible dès 200–300 ppm (dès 25 ppm ou seulement vers 600 ppm selon d'autres sources). Il est surtout utilisé comme solvant de composés organiques. Caractéristiques chimiques : Caractéristiques chimiques - Il est peu soluble dans l'eau (13 à 20 g·l-1 à 20 °C) ; - Il est miscible avec la plupart des solvants organiques ; - Solvant efficace sur de nombreux produits organiques (graisses, huiles, résines, etc.). - Il réagit violemment (explosion possible en présence de certains catalyseurs courants ou d'autres solvants chlorés) avec des poudres métalliques (aluminium, magnésium), et réagit spontanément et fortement avec les métaux alcalins, les bases fortes et les oxydants puissants. Extraction par solvant Température Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this paper, subcritical CH2Cl2 solvent was applied to the degreasing process of sheepskin. The optimal process parameters of degreasing were determined by single factor experiment and the degreasing efficiency was evaluated by the degreasing rate. The effect of degreasing temperature on the connection between hair and hair follicle, fat content of lipid cells and the fibre dispersion of the sheepskin were investigated through the use of optical microscope and the scanning electron microscope. The single experiments results showed that when the moisture content of the raw skin was about 60%, degreasing time was 50 minutes, degreasing temperature 39°C, and degreasing pressure 0.5MPa and the solid liquid ratio was 1:7. The degreasing rate of sheepskin with the subcritical CH2Cl2 extraction was 52%. The results of histological observation and scanning electron microscopy showed that the connection between the hair and the hair follicle is weakened and the lipid cells have a relatively low lipid content with increasing temperature. However; the fibres were well dispersed when the degreasing temperature was higher than 41°C, therefore, the most suitable degreasing temperature would be about 40°C. Compared with the traditional degreasing methods, subcritical CH2Cl2 extraction has the characteristics of clean and environmental protection, good fibre dispersion and good bond between hair and hair follicle. Note de contenu : - MATERIALS AND METHODS : Experimental instruments and materials - Sample preparation - Optimisation of subcritical CH2Cl2 extraction variables for degreasing process - Effect of degreasing temperature on the connection between hair and hair follicle - Effect of degreasing temperatures on the fibre dispersion - RESULTS AND DISCUSSION : Optimisation of degreasing process parameters - Effect of degreasing temperature on the connection betweenhair and hair follicle - Effect of degreasing temperature on dispersion of skin fibre - Table 1 : Single-factor experiment design table En ligne : https://drive.google.com/file/d/13j7hoPwqKJt0tMrSRGNajc9BUT6TLBMo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35543 [article]

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Study on the dry-cleaning process of mink fur Based on subcritical solvent / Yingxuan Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 9 (09/2021)  

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The effect of fatliquor emulsion on the physical properties of resultant leather / Zongcai Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 3 (05-06/2004)  

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