Biotechnological Potentialities and Valorization of Citrus Waste: Their Potential Applications

Citrus processing generates a considerable amount of waste, including peels, pomace, and seeds. These by-products are valuable, as they are rich in bioactive compounds such as polyphenols, antioxidants, essential oils, pectin, and dietary fibers. Various biotechnological approaches have been explored to transform these by-products into valuable resources across industries. Fermentation processes can produce organic acids from citrus waste. Enzymatic and microbial treatments enhance the bioavailability of nutrients in these by-products, making them suitable for animal feed additives and organic fertilizers, promoting sustainable waste management practices. Citrus by-products can be converted into biofuels through enzymatic hydrolysis, microbial fermentation, anaerobic digestion, gasification, and genetic engineering. Additionally, advanced extraction techniques like microwave, supercritical fluid, and ultrasound-assisted extraction have been utilized to recover valuable components from citrus by-products. Extracted compounds can be utilized in various industries, for instance, pectin serves as a gelling agent in dairy products and jams, essential oils and polyphenols are used in food coatings and packaging, and citrus fiber can enhance the nutritional profile of bakery products. This chapter explores the biotechnological valorization of citrus by-products/waste and highlights their potential applications across industries.