Changes in chemical composition of frozen coated fish products during deep-frying.
This work evaluates the influence of deep-frying coated fish products on total fat, fatty acid (FA) and amino acid profile, and on the formation of volatile compounds, with special attention on furan and its derivatives due to their potential harmful characteristics. As expected, deep-frying in sunflower oil increased linoleic acid content, but total fat amount increased only by 2% on a dry basis. Eicosapentanoic and docosahexanoic acids were preserved while γ- and α-linoleic acids were oxidised. Deep-frying also induces proteolysis, releasing free AA, and the formation of volatile compounds, particularly aldehydes and ketones arising from polyunsaturated FA. In addition, high quantities of furanic compounds, particularly furan and furfuryl alcohol, are generated during deep-frying coated fish. The breaded crust formed could contribute simultaneously for the low uptake of fat, preservation of long chain n-3 FA, and for the high amounts of furanic compounds formed during the deep-frying process.
REQUIMTE, Laboratório de Bromatologia e Hidrologia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto , Porto , Portugal and.
Trinidad
T
Pérez-Palacios
Catarina
C
Petisca
Susana
S
Casal
Isabel M P L V O
IM
Ferreira
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001939:Bread; D003296:Cooking / Q000379:methods*; D004041:Dietary Fats / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis*; D015525:Fatty Acids, Omega-3 / Q000032:analysis; D005396:Fish Products / Q000032:analysis*; D005615:Freezing; D005663:Furans / Q000032:analysis*; D006358:Hot Temperature; D008041:Linoleic Acids / Q000032:analysis; D015227:Lipid Peroxidation; D010938:Plant Oils; D000074242:Sunflower Oil; D055549:Volatile Organic Compounds / Q000032:analysis
D000596:Amino Acids; D004041:Dietary Fats; D005227:Fatty Acids; D015525:Fatty Acids, Omega-3; D005663:Furans; D008041:Linoleic Acids; D010938:Plant Oils; D000074242:Sunflower Oil; D055549:Volatile Organic Compounds; C039281:furan