Optimization of Ultrasound‐Assisted Dietary Fiber Extraction From Pineapple Crown Leaves

ABSTRACT The potential of pineapple crown leaves as a feasible source of dietary fiber was examined in the current study using ultrasound‐assisted extraction (UAE). In order to evaluate the impacts of amplitude, extraction time, and solvent‐to‐solid ratio on fiber, the extraction process was optimized using Response Surface Methodology in compliance with a Box–Behnken design. 3.26% of dietary fiber was produced under optimal conditions, which included an amplitude of 31.57%, a sonication period of 29.96 min, and a solid–liquid ratio of 1:29.85. UAE greatly improved fiber yield and functional properties when compared with conventional alkaline extraction. Increased water‐holding capacity, oil‐holding capacity, swelling capacity, and glucose adsorption capacity were demonstrated by the ultrasound‐assisted dietary fiber (UAEDF), suggesting improved physicochemical properties. FTIR and SEM structural characterization showed enhanced porosity, better surface roughness, and partial rupture of the cellulose–hemicellulose–lignin matrix. Improved thermal stability of UAEDF was demonstrated by thermogravimetric analysis. These results support waste valorization and highlight UAE as an effective, environmentally friendly, and sustainable method for recovering total dietary fibers from pineapple crown leaves, demonstrating their potential for future development as value‐added food ingredients.