A comparative study of ultrasonic degumming of silk sericin using citric acid, sodium carbonate and papain / Wuchao Wang in COLORATION TECHNOLOGY, Vol. 135, N° 3 (06/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 3 (06/2019) . - p. 195-201 Titre : A comparative study of ultrasonic degumming of silk sericin using citric acid, sodium carbonate and papain Type de document : texte imprimé Auteurs : Wuchao Wang, Auteur ; Yi Pan, Auteur ; Kang Gong, Auteur ; Qi Zhou, Auteur ; Tonghua Zhang, Auteur ; Qing Li, Auteur Année de publication : 2019 Article en page(s) : p. 195-201 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dégommage Essais dynamiques Fibres textiles -- Analyse Fibres textiles -- Propriétés mécaniques Morphologie (matériaux) Nettoyage par ultrasons Résistance à la traction Séricine Soie et constituants Surfaces -- Analyse Index. décimale : 667.3 Teinture et impression des tissus Résumé : The utilisation of ultrasonics has been shown to enable efficient and environmentally friendly textile wet processing. This study conducted a comparative investigation of silk degumming by using a conventional heating bath and ultrasonic irradiation at a range of ultrasonic frequencies. Citric acid, sodium carbonate and papain were used as degumming agents. Sericin degumming rate, fibre whiteness, fibre surface morphology, fibre structure characteristics and fibre tensile properties were measured and analysed. Results showed that ultrasonics at a lower frequency produced a greater degumming rate than at a higher frequency. Ultrasonics is a more effective way than the conventional heating bath of improving degumming efficiency, especially at a lowered temperature of 60 °C. When sodium carbonate was applied at 90 °C, a conventional heating bath was found to be more effective than ultrasonics. Papain was found to be more effective in sericin removal than citric acid and sodium carbonate, with a degumming rate of 22% achieved at 60 °C under ultrasonic irradiation at 40 kHz. The use of papain can, however, cause a possible overreaction to silk under certain severe conditions, resulting in a loss of fibre whiteness. Negligible changes in fibre structure characteristics were measured by Fourier Transform–infrared spectroscopy and X‐ray diffraction after ultrasonic degumming with papain. Slightly reduced fibre strength and increased fibre extensibility were observed in ultrasonically degummed silk samples compared with un‐degummed and conventionally degummed silk samples. Note de contenu : - EXPERIMENTAL : Materials - Equipment - Sample preparation - Degumming - Determination of fibre weight loss - Determination of fibre whiteness - Fibre surface analysis - Infrared spectra - X-ray diffraction - Tensil testing - RESULTS AND DISCUSSION : Degumming rate - Fibre whiteness - Fibre surface morphology - Fibre structure characteristics and tensile strength DOI : 10.1111/cote.12392 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12392 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32617 [article]

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Natural colorant extraction from Cinnamomum camphora tree leaves of different maturities and its ultrasonic-assisted extraction process / Kang Gong in COLORATION TECHNOLOGY, Vol. 135, N° 4 (08/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 4 (08/2019) . - p. 312-321 Titre : Natural colorant extraction from Cinnamomum camphora tree leaves of different maturities and its ultrasonic-assisted extraction process Type de document : texte imprimé Auteurs : Kang Gong, Auteur ; Yi Pan, Auteur ; Luqman Jameel Rather, Auteur ; Wuchao Wang, Auteur ; Zhou Qi, Auteur ; Tonghua Zhang, Auteur ; Qing Li, Auteur Année de publication : 2019 Article en page(s) : p. 312-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Camphrier et constituants Le camphrier ou arbre à camphre (Cinnamomum camphora (L.) J. Presl, 1825) est une espèce d'arbres de la famille du laurier (Lauraceae) dont on extrait le camphre par distillation de son bois, dit "bois de Ho". Colorants végétaux Extraction (chimie) Extraction par ultrasons Index. décimale : 667.2 Colorants et pigments Résumé : This study investigated natural colorant extraction from camphor tree leaves using a green and effective process. Ethanol, acetic acid, aqueous sodium carbonate and an aqueous solution of cellulase enzyme were used to examine the extraction performance, with and without the assistance of ultrasonics. Results showed that when subjected to changes in frequency and extraction time, ultrasonics is able to accelerate the extraction process and achieve a better yield for chlorophyll and anthocyanin extraction from fresh leaves compared with a traditional heating bath at similar temperatures. However, when an alkaline solvent was used to extract dark brown colorant from the old leaves, a traditional heating bath was found to be more effective than ultrasonic extraction. Cellulase enzyme failed to show its effectiveness in this study when serving as a colorant-extracting solvent, regardless of the use of ultrasonics. Note de contenu : - EXPERIMENTAL : Collection and preparation of the leaves - Extraction equipment and condition - Extracting solvents - Extraction process - RESULTS AND DISCUSSION : Extraction performance - Ultrasonic-enhanced extraction process - Ethanol extraction - Acid and alkaline extraction Enzyme extraction - Colour yield of camphor tree leaves with different extracting solvents and extraction methods DOI : 10.1111/cote.12406 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12406 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32834 [article]

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