Exploring the Potential of Dacryodes Edulis Leaf Extract as Natural Colourant on Polyamide Fabrics: Extraction, Characterization and Application Poro Clark, Johnson Otutu, Augustine Kanayochukwu Asiagwu, Gloria Ndukwe Substantia, 2024 There is a growing demand for sustainable and eco-friendly alternatives in the textile industry, particularly in search of natural colourants derived from plants. This research study investigates the extraction and characterization of natural colourant from the leaf of D. edulis and explores its application to polyamide fabrics. Laboratory experiments, such as solvent extraction was performed to obtain the colourant. The extraction process was optimized using Response Surface Methodology-Central Composite Design (RSM). The dye was isolated and characterized using vacuum liquid chromatography, UV-Vis spectrophotometry, high-performance liquid chromatography and Fourier-transform infrared spectroscopy. Physical properties such as light fastness, perspiration fastness, rubbing fastness and wash fastness were assessed to determine the durability and stability of the natural colourant on the fabrics. The results indicated that the optimal conditions for dye extraction are 65.9 ℃ and 2 hours, providing feasible parameters for replication. Examination of the natural dye obtained from the isolated fraction, revealed the presence of carbon-carbon double bonds (C=C), carbonyl (C=O), ester (-COO), aldehyde (CHO) and hydroxyl (-OH) groups; with rutin, isoquercetin and tannic acid as its major compounds. The isolated dye exhibited an absorption peak at 403 nm. The ratings for the treated fabrics varied from fair to good and very good. The light fastness ranged from 4 to 6, perspiration fastness and wash fastness ranged from 2-4, and rubbing fastness ranged from 3-5. On the other hand, the untreated fabrics had ratings, with a range of 2-5 for light fastness, 2-4 for perspiration fastness and wash fastness and 1-4 for rubbing fastness, it was also observed that the colour strength values of mordanted fabrics were deeper than those of the unmordanted fabrics. These results indicate that the dye obtained from D. edulis leaf has considerable potential as a source of natural dyes. These findings contribute valuable insights into the extraction, characterization and application of natural colourants, promoting a shift towards more sustainable and eco-friendly practices in the textile industry.
In vitro antioxidant and antimicrobial potentials of three extracts of Amaranthus Hybridus L. Leaf and Their phytochemicals Gloria Ihuoma Ndukwe, Poro David Clark, Ibiba Reuben Jack European Chemical Bulletin, 2020 The study sought to determine the phytochemical components, antioxidant and antimicrobial activities of n-hexane, ethyl acetate and methanolic extracts of Amaranthus hybridus L. leaf. Three extracts of A. hybridus were examined for antimicrobial activity using disc diffusion assay. The different extracts demonstrated varied concentration-dependent antimicrobial activities against the test organisms. All extracts studied in this work were active against E. coli, S. aureus, B. cereus, T. mentagrophyte and A. niger. The methanol extract showed potent inhibitory activity against T. mentagrophyte when compared to a standard antifungal agent, fluconazole. In vitro antioxidant activities were studied spectrophotometrically using vitamin C as standard. There were significant correlations between the methanolic extract and vitamin C for 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging, reducing ability, hydroxyl radical inhibitory and phosphomolybdate scavenging. The results of this study have shown that leaves of A. hybridus possess bioactive compounds which contributed to its antimicrobial and antioxidant properties.
