Reduction in flavor-intense components in fish protein hydrolysates by membrane filtration

Enzymatic protein hydrolysates based on side stream materials from the fish-filleting industry are increasingly explored as food ingredients. However, intense sensory properties, and high salt contents, are often a limiting factor. Most of the sensory attributes, such as fish flavor and salty taste,...

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Bibliographic Details
Published in:Journal of Food Science
Main Authors: Steinsholm, Silje, Oterhals, Åge, Thoresen, Lars, Underhaug, Jarl, Kousoulaki, Katerina, Aspevik, Tone
Format: Article in Journal/Newspaper
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/11250/2771344
https://doi.org/10.1111/1750-3841.15855
Description
Summary:Enzymatic protein hydrolysates based on side stream materials from the fish-filleting industry are increasingly explored as food ingredients. However, intense sensory properties, and high salt contents, are often a limiting factor. Most of the sensory attributes, such as fish flavor and salty taste, can be ascribed to low-molecular-weight, water-soluble components, whereas bitterness is associated with small hydrophobic peptides. In this study, protein hydrolysates based on head and backbone residuals from Atlantic salmon (Salmo salar) and Atlantic cod (Gadus morhua) were produced using two different enzymes. The effects of micro- and nanofiltration on the chemical composition, protein recovery, and sensory properties of the final products were investigated. The choice of raw material and enzyme had negligible effects, whereas nanofiltration caused a considerable reduction in metabolites, ash, and the intensity of several sensory attributes. The intensity of bitterness increased after nanofiltration, indicating that small peptides associated with bitter taste were retained by the membrane. Total protein yield after microfiltration was 24%–29%, whereas 19%–24% were recovered in the nanofiltration retentate. publishedVersion