1. Eco friendly functional finishes of polyester fabric using keratin from wool and feather wastesLidija Fras Zemljič, Maja Čolnik, Darinka Fakin, Tanja Pušić, Vanessa Wendy Bračko, Tjaša Kraševac Glaser, Mojca Škerget, 2024, original scientific article Abstract: This research showcases the use of hydrothermally extracted solutions from poultry feathers and wool as ecofriendly and versatile textile finishes. These solutions, derived from waste biomass containing the keratin
biopolymer, were obtained through environmentally conscious hydrothermal degradation processes. Initially,
the study focused on analysing the chemical parameters and properties of both dialysed and non-dialysed solutions extracted from feathers and wool. The investigation tracked primarily the presence of keratin within these
solutions. Upon application to polyester textiles as the reference material, the presence of these solutions on the
fabric surface was confirmed successfully. A thorough physicochemical analysis of the treated textiles involved
various analytical techniques. These encompassed surface composition analysis via X-ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR), assessment of wettability through Contact Angle measurements, determination of surface charge using surface zeta
potential, and examination of the thermal and flame-retardant properties via Differential Scanning Calorimetry
(DSC), Thermogravimetric Analysis (TGA), and calorimetric tests. In addition, the colour, UV radiation transmission and antioxidant activity were evaluated using standard tests.
The remarkable effects of the treatment have been observed in the exceptional antioxidative action, fire
resistance, UV protection and enhanced hydrophilicity of these innovative multifunctional textiles. This
approach holds significant implications across research, economics and society, enriching Material Science by
deepening the understanding of materials and their multifaceted properties. Moreover, it promotes resource
efficiency, opens new sustainable textile market prospects, and contributes to social impact by supporting
environmental sustainability, engaging communities and ensuring health and safety benefits.
Keywords: poultry feathers and wool, hydrothermal extraction, polyester, finishing, green, multifunctionality
Published in DKUM: 03.09.2024; Views: 43; Downloads: 13
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2. Efficient and Green Isolation of Keratin from Poultry Feathers by Subcritical WaterMojca Škerget, Maja Čolnik, Lidija Fras Zemljič, Lidija Gradišnik, Tanja Živković Semren, Blanka Tariba Lovaković, Uroš Maver, 2023, original scientific article Abstract: The isolation of keratin from poultry feathers using subcritical water was studied in a batch reactor at temperatures (120–250 °C) and reaction times (5–75 min). The hydrolyzed product was characterized by FTIR and elemental analysis, while the molecular weight of the isolated product was determined by SDS-PAGE electrophoresis. To determine whether disulfide bond cleavage was followed by depolymerization of protein molecules to amino acids, the concentration of 27 amino acids in the hydrolysate was analyzed by GC/MS. The optimal operating parameters for obtaining a high molecular weight protein hydrolysate from poultry feathers were 180 °C and 60 min. The molecular weight of the protein hydrolysate obtained under optimal conditions ranged from 4.5 to 12 kDa, and the content of amino acids in the dried product was low (2.53% w/w). Elemental and FTIR analyses of unprocessed feathers and dried hydrolysate obtained under optimal conditions showed no significant differences in protein content and structure. Obtained hydrolysate is a colloidal solution with a tendency for particle agglomeration. Finally, a positive influence on skin fibroblast viability was observed for the hydrolysate obtained under optimal processing conditions for concentrations below 6.25 mg/mL, which makes the product interesting for various biomedical applications.
Keywords: poultry feathers, subcritical water hydrolysis, keratin, physico-chemical characterization, cytotoxicity
Published in DKUM: 28.11.2023; Views: 456; Downloads: 153
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3. Primerjava ogrodij Node.js za razvoj spletnih strežnikov JavascriptNejc Novak, 2018, master's thesis Abstract: V magistrskem delu smo na podlagi pregleda dokumentacije, izvedbe eksperimenta in analize pridobljenih podatkov predstavili in primerjali sedem aktualnih ogrodij Node.js. Izbrana aktualna ogrodja so bila Express, Hapi, Loopback, Feathers, Koa, Nest in Sails. Z deskriptivno analizo smo izpostavili posebnosti ogrodij in primerjali podobnosti med njimi. Za posamezno ogrodje smo predstavlili implementacijo storitev REST, povezovanje s podatkovno bazo, avtentikacijo in avtorizacijo uporabnika ter pripravo ogrodja za izvedbo v produkcijskemu okolju. Pri implementaciji sta bila izvedena eksperimenta primerjalne analize in merjenje zmogljivosti ogrodja z obremenitvenimi testi. Ugotovljeno je bilo, da ima ogrodje Nest na podlagi teoretičnega modela najboljšo oceno med analiziranimi ogrodji. Ugotovljeno je bilo tudi, da so ogrodja, ki podpirajo več funkcionalnosti, manj zmogljiva. Za nadaljnjo delo bomo zaključili poslovno logiko tipične rešitve in izvedli eksperimenta s spremembo podatkovnega modela in implementacijo avtentikacije z računi Google. Na podlagi eksperimenta bomo izvedli analizo opravljenih sprememb v rešitvi in ugotovili, kako ogrodje vpliva na vzdrževanje programske rešitve.
Keywords: Node.js, ogrodja, express, koa, hapi, nest, loopback, feathers, sails, spletni, strežnik, primerjava
Published in DKUM: 08.11.2018; Views: 1418; Downloads: 247
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