Trends in kiwifruit and byproducts valorization

Kiwifruit is a worldwide appreciated fruit with significant economic and nutritionally importance. Its industrial processing generates high amount of waste, which currently exhibits low market value being mostly employed as fertilizer. Nevertheless, culled kiwifruit, underused peels, seeds or pruning remains (i.e. leaves and twinges) would be an attractive source of bioactive compounds with prospective applications in the food and non-food sectors. Kiwifruit and the corresponding wastes display a notable number of healthy features with relevant benefits for consumer's health (e.g. strong antioxidant, anti-inflammatory, and protective against heart diseases, cancer, diabetes, or central nervous system diseases). Overall, this work explores a new approach about nutritional composition of kiwifruit and its different by-products fractions. This review also provides an outline on the bioactive compounds found in kiwifruit, products and by-products. In parallel, it offers an updated vision of the impact of cultivation and processing conditions on their bioactive characteristics. Moreover, the positive aspects of selecting eco-friendly extraction techniques as well as green and efficient treatments to provide high value added products from underutilized kiwifruit wastes is pointed out. Kiwifruit and its by-products are natural resources which present several nutraceutical phytocompounds with potential commercial applications. The valorization of these waste-to-value food can be addressed through environmentally friendly extraction procedures which allow recovery of target bioactive components to enrich novel food and non-food products. • Kiwifruit industry presents a high disposal generation like peels, seeds or pruning remains. • Peels features the highest phenolic content among protocatechuic, chlorogenic or caffeic acids. • Fruits and wastes exhibits interesting antioxidant, anti-inflammatory, antitumoral features. • Kiwifruits are protective against heart or central nervous system diseases. • Cultivation, storage and extraction procedures highly impact their bioactive profiles.