Aqueous Extraction and Characterization of Eucalyptus Globulus for Use as Natural Dyes
DOI:
https://doi.org/10.54536/ari.v2i2.3769Keywords:
Dyes, Eucalyptus, Fastness Ratings, Pre-Metallized, Substrates, Spectral CharacteristicsAbstract
This study investigates the extraction, characterization, and application of natural dyes from Eucalyptus bark and leaf granules using solvents such as 2-ethoxy-ethanol, acetone, methanol, and distilled water. The dyes were characterized using Fourier Transform Infrared Spectroscopy (FTIR) and UV-visible spectroscopy with analyses performed using a Bruker Advanced 400 MHz FT spectrophotometer. FTIR analysis identified key functional groups such as hydroxyl (O-H), carbonyl (C=O), and aliphatic (C-H), indicating the presence of phenolic compounds, flavonoids, tannins, and fatty acids. Fastness tests, including wash, light, and rubbing fastness, were conducted and assessed on gray and blue scales, revealing differences in hue and shade between pre-metallized and un-pre-metallized substrates. Dyes extracted from leaves in distilled water and methanol showed higher absorbance, while bark extracts provided deeper brown shades on cotton fabrics. Leaf extracts produced lighter, greenish-brown shades. The fastness ratings ranged from very good to excellent, demonstrating the potential of Eucalyptus-based dyes for sustainable textile applications.
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