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In this study, bioactive compounds from strawberry pomace, a by-product of the local fruit juice industry, were extracted using ultrasound-assisted extraction under varying experimental conditions: extraction time (5, 25, or 45 min), ethanol concentration (20, 50, or 80 %), and liquid-to-pomace ratio (5, 25, or 45 mL/g). The extraction process was optimized based on the total phenolic content (TPC) using the Box-Behnken experimental design and response surface methodology. The optimal conditions, extraction time of 37 min, ethanol concentration of 48.4%, and a liquid-to-solid ratio of 40.4:1, resulted in a strawberry pomace extract (SPE) with a TPC of 0.80 mg GAE/mL extract and a total flavonoid content (TFC) of 0.24 mg QE/mL extract. The obtained SPE, along with chitosan (CH) and pectin (P), was utilized to functionalize 100% cotton fabric using layer-by-layer assembly. Specifically, the cotton fabric was coated with four, eight, or twelve bilayers of positively charged (CH-SE) and negatively charged (P-SE) solutions. The coated fabrics were evaluated for their antioxidant activity (ABTS assay), the release of bioactive compounds (monitored using UV-Vis spectroscopy), and the ultraviolet protection factor (UPF). The results demonstrated that untreated cotton exhibited an antioxidant activity of 44.9%, whereas all coated fabrics showed antioxidant activity exceeding 98.4%. Among the three coated fabrics, the fabric coated with twelve bilayers of (CH-SE)/(P-SE) possessed the highest bioactive compound release and a UPF factor >50, making it the most suitable candidate for healthcare textile applications.
| Scientific Sections | Revalorization of bio- and industrial waste |
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