Protein Hydrolysates from Fishery Processing By-Products: Production, Characteristics, Food Applications, and Challenges

Abstract

Fish processing by-products such as frames, trimmings, and viscera of commercial fish species are rich in proteins. Thus, they could potentially be an economical source of proteins that may be used to obtain bioactive peptides and functional protein hydrolysates for the food and nutraceutical industries. The structure, composition, and biological activities of peptides and hydrolysates depend on the freshness and the actual composition of the material. Peptides isolated from fishery by-products showed antioxidant activity. Changes in hydrolysis parameters changed the sequence and properties of the peptides and determined their physiological functions. The optimization of the value of such peptides and the production costs must be considered for each particular source of marine by-products and for their specific food applications. This review will discuss the functional properties of fishery by-products prepared using hydrolysis and their potential food applications. It also reviews the structure–activity relationships of the antioxidant activity of peptides as well as challenges to the use of fishery by-products for protein hydrolysate production.

Effect of microwave (MW)-subcritical extraction on oil recovery, oxidative stability, and lipid types from Katsuwonus pelamis livers

“…The annual catch of tuna in the world has exceeded 4 million tons, accounting for 3% of the total output ( FAO, 2022 ). Recently, growing attention has been given to the use of fish by-products ( Nikoo, Regenstein, & Yasemi, 2023 ; Stevens, Newton, Tlusty, & Little, 2018 ). 70% of inedible parts of tuna could be collected from a commercial production line, including head, skin, and bone ( Sasidharan & Venugopal, 2020 ).…”

Exploitation of bones-rich poultry by-products to produce protein hydrolysates: optimization of hydrolysis parameters and chemical characterization

“…Protein hydrolysis has been increasingly applied in the last decade for the recovery of protein from several biomasses, both of plant ( Calcinai et al, 2022 ; Prandi et al, 2023 ), dairy ( Tedeschi et al, 2022 ), and seafood origin ( Nikoo et al, 2022 ; Nikoo et al, 2023 ). Focusing on poultry by-products, there are keratinized biomass that are difficult to recycle as such, such as feathers, while their hydrolysates obtained via microbial, enzymatic or physicochemical methods find applications as fertilizers, biofuels, microbial media, cosmetics, animal feed, and bioactive peptides ( Callegaro et al, 2019 ).…”