Changes in macronutrient content and amino acid composition of fresh sardine and sardine after defrosting in a fridge or using a microwave oven

Authors

  • A. María Castrillón
  • María Trinidad García Arias
  • María del Camino García Fernández
  • M. E. Alvarez Pontes

DOI:

https://doi.org/10.18002/analesdeveterinaria.v38.7864

Keywords:

sardine, amino acids, defrosting, microwave

Abstract

Sardines (Clupea pilchardus) were frozen, stored in frozen state and then defrosted by the two most common defrosting processes: a conventional method (refrigeration) or using a microwave oven. Before freezing and after defrosting, humidity, fat, protein and ash content as well as amino acid composition were analyzed in order to compare the influence of both processes. Sardines defrosted with microwave oven maintained a similar protein content level than fresh sardine, whereas the protein content of the conventional defrosted sardine decreased. The ash content decreased in both cases and the fat percentage increased in the traditional defrosted sardine. After both defrosting processes, losses of cystine, hystidine and lysine were found. The content of the rest of the amino acids investigated decreased after the conventional defrosting and remained at the same levels after microwave defrosting.

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Published

1994-01-02

Issue

Section

Research papers