Goldenrod (Solidago) is a perennial plant native to North America that was introduced to Europe as an ornamental plant in the 19th century and is now considered as an invasive weed in Europe, Asia, Australia, and New Zealand. Control of the spread of invasive plants is usually carried out by mechanical removal from the environment and burning. To make beneficial use of the waste plant, goldenrod was studied in this thesis as a source of phytochemicals for the eco-weeding of textiles. In the experimental part of the thesis, inflorescences of the giant goldenrod (S. gigantea) were used to dye cotton and linen fabrics. Two dyeing temperatures (room temperature and 95 °C) were chosen, and the fabrics were pre-treated with chitosan. Zeta potential analysis showed an increased isoelectric point and an amphoteric character of the textiles after pre-treatment with chitosan. The colour coordinates (CIELAB) and the colour strength (K/S) change with chitosan pre-treatment and higher dyeing temperatures. The samples become darker and more yellow, and the colour strength increases. Accordingly, the antioxidant activity (66,33 %) and UV protection (50+) are also increased.
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