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The influence of lipid content and pretreatment methods on protein conformation in fish (capelin, Mallotus villosus ) during smoking and drying

The influence of lipid content and pretreatment methods on protein conformation in fish (capelin, Mallotus villosus ) during smoking and drying


Title: The influence of lipid content and pretreatment methods on protein conformation in fish (capelin, Mallotus villosus ) during smoking and drying
Author: Odoli, Cyprian Ogombe
Oduor‐Odote, Peter
Arason, Sigurjón
Date: 2019-02-27
Language: English
Scope: 1446-1454
University/Institute: Háskóli Íslands
University of Iceland
School: School of Health Sciences (UI)
Heilbrigðisvísindasvið (HÍ)
Department: Faculty of Food Science and Nutrition (UI)
Matvæla- og næringarfræðideild (HÍ)
Series: Food Science & Nutrition;7(4)
ISSN: 2048-7177
DOI: 10.1002/fsn3.980
Subject: Drying; Fish; Protein conformation; Smoking; Fiskar; Þurrkun matvæla; Reyking matvæla; Fituefni
URI: https://hdl.handle.net/20.500.11815/1780

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Citation:

Odoli, CO, Oduor‐Odote, P, Arason, S. The influence of lipid content and pretreatment methods on protein conformation in fish (capelin, Mallotus villosus) during smoking and drying. Food Science & Nutrition 2019; 7: 1446– 1454. https://doi.org/10.1002/fsn3.980

Abstract:

The influence of lipid content and pretreatment methods (blanching and brining) on proteins conformation in fish (Capelin, Mallotus villosus) during drying and smoking were assessed. Soluble protein fractions were examined through changes in salt-soluble proteins, sulfhydryl groups, and disulfide bonds contents. The salt level and moisture content were also evaluated. Conformational changes in muscle protein were significant (p < 0.05) after blanching and during initial drying when moisture content and dryness rates were high. Salt-soluble proteins and total sulfhydryl groups contents reduced, whereas available sulfhydryl group and disulfide bonds contents intensified. The conformational changes were explained by muscle protein denaturation and aggregation ascribed to high temperature and dehydration during processing. The study reports fish protein denaturation to have reduced protein solubility as well as the nutritional value (loss of thermolabile compounds) and yield after smoking. More so, protein aggregation that was significantly (p < 0.05) higher in dried blanched fish could have reduced the dried fish sensory quality. Blanching pretreatment is thus not suitable for commercial capelin drying. Lipids were found to have protective effect against fish protein conformation.

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