Effect of ultrasound‐assisted extraction of dietary fiber from the sweetest variety Queen pineapple waste of Tripura (India)

Abstract

The study aimed to assess the functional attributes of dietary fiber (DF) from the sweetest variety of Queen pineapple of Tripura Region (India) having high pleasant aroma and flavor. Queen pineapple peel waste was used to extract DF, which is one of the important bioactive compounds in the human diet and health. The ultrasoundassisted extraction (UAE) method was used to compare the traditional alkali extraction method for extracting DF from Queen pineapple peel waste. The extracted DF was further examined for its functional attributes. The parameters used for UAE of DF were optimized using response surface methodology. The results showed that Queen pineapple peel waste was having a significant amount of DF and had a high potential in food processing. The conventional alkaline extraction yielded 64.43% DF, whereas the UAE method yielded 86.67% after 22.35 min of sonication with a solid: liquid ratio of 27.5 g/ml and a 46.9% ultrasonic amplitude. UAE improved the functional attributes of DF by significantly increasing the water holding and swelling capacities while decreasing the oil holding capacity. The cation exchange capacity, glucose adsorption capacity, and glucose dialysis retardation index were enhanced considerably by UAE, whereas the emulsifying capacity decreased. Results of the present investigation corroborate that Queen pineapple waste extracted DF could be used as a potential hypoglycemic agent for functional food ingredients in bread and bakery-based products, meat-based products, dairy-based beverages, and other products of food application.