1. Week: 7

2. Fatty acid composition of fish
Min. Max.
14:
16:
16:
18:
18:
18:
18:
18:
20:
20:2 0,2 0,6
20:
20:
22:
22:
22:

3. Free fatty acids → ketones
Oil = mainly triglycerides
Triglycerides → free fatty acids
peroxides
Free fatty acids → ketones
aldehydes

5. Amino acid composition, fish, g/kg
Lysine 12,3
Methionine 4,7
Cystine 1,5
Treonine 6,6
Tryptofane 2,0
Isoleucine 7,0
Leucine 11,2
Histidine 3,6
Fenylalanine 6,0
Tyrosine 5,1
Valine 8,4
Asparagine 14,3
Serine ,9
Glutamic acid 20,6
Proline 5,7
Glycine 8,2
Alanine 8,8
Ornithine 0,1
Arginine 8,7
Hydroxyproline 0,7

6. Biogenic amines → TMA, DMA, NH3
Proteines → poly-peptides
Poly-peptides → free amino acids
Free amino acids → biogenic amines
Biogenic amines → TMA, DMA, NH3

7. Amino acid decomposition
Lysine → cadaverine
Histidine → histamine

11. THEREFORE:
Preservation