Natural Dyeing of Wool Using Junglans regia (Common Walnut) Leaf Extract
Alenka Ojstršek, University of Maribor, Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Smetanova 17, 2000 Maribor, Slovenia, Darinka Fakin, University of Maribor, Faculty of Electrical Engineering and Computer Science, Institute of Automation, Koroška cesta 46, 2000 Maribor, Slovenia, University of Maribor, Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Smetanova 17, 2000 Maribor, Slovenia
2019
Tekstilec
The main objective of the presented research was to study the possibility of using natural colourants obtained through the aqueous extraction of fresh leaves from the Junglans regia (J. regia), or common walnut tree, for the dyeing of wool yarn. A unique principle was explored by combining the phases of extraction and mordanting into one with the aim of shortening the dyeing procedure, while at the same time extracting more colouring components. Spectrophotometric studies revealed the signifi
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... nt impact of both mordant addition and dye-bath pH on the absorbance curve and thus on the colour and K/S values of the dyed samples. A meta-mordanting technique using ferrous sulphate produced a greater depth of shade at a wavelength of 400 nm, with respect to the concentration of mordant and the liquid ratio of the extraction. Finally, wool yarn dyed with pure leaf extracts exhibited a potent inhibiting activity against Candida albicans (C. albicans) with a moderate reduction rate of 59%, and an inhibited response against Staphylococcus aureus (S. aureus) with a low reduction rate of 38.6%. Izvleček Namen predstavljene raziskave je bil proučiti možnost uporabe naravnih barvil, pridobljenih z vodno ekstrakcijo svežih listov iz drevesa Junglans regia (J. regia), navadnega oreha, za barvanje volnene preje. Raziskali smo edinstven pristop z združevanjem obeh faz, ekstrakcije in dodajanja anorganskih soli, v eno fazo, da bi skrajšali postopek barvanja in hkrati ekstrahiranja večje količine barvila za barvanje. Spektrofotometrična študija je pokazala pomemben vpliv uporabljene anorganske soli -čimže in pH barvalne kopeli na absorpcijsko krivuljo ter posledično na barvo in K/S vrednosti obarvanih vzorcev. Tehnika dodajanja železovega sulfata med barvanjem daje večjo globino obarvanja pri valovni dolžini 400 nm, to je odvisno od koncentracije oksida in kopelnega razmerja ekstrakcije. Prav tako smo dosegli zmerno protimikrobno delovanje obarvane volne proti glivičnemu sevu Candida albicans (C. albicans), z 59-odstotno stopnjo zmanjšanja in nizko stopnjo delovanja proti bakteriji Staphylococcus aureus (S. aureus) z 38,6-odstotno stopnjo zmanjšanja. Ključne besede: naravna barvila, barvanje volne, ekstrakt orehovih listov, železov sulfat, barvna metrika, protimikrobno delovanje Tekstilec, 2019, 62(4), 288-298 Natural dyeing of wool using Junglans regia (common walnut) leaf extract
doi:10.14502/tekstilec2019.62.288-298
fatcat:n4teo3czrrhdnfirfyhflmcik4
