Open Access

Table 1

Proximate and amino acid composition of rapeseed meal (RM), rapeseed protein concentrate (RPC) and fish meal (FM) and concentration of antinutritional factors detected in RPC.

Ingredients RM RPC FM

Proximate composition (% of dry matter)
Crude Protein 41.6 71.2 69.0
Crude fat 1.2 0.6 7.0
Crude ash 10.5 16.1 20.7
Crude fibre 11.5 0.5 0.5
Nitrogen-free Extract (NfE) a 35.2 11.6 2.8
Gross energy b (MJ/kg) 18.6 19.4 19.9
Essential amino acids (g/100 g crude protein)
Arginine 6.30 6.78 5.84
Histidine 2.75 3.86 2.00
Isoleucine 4.16 3.79 3.62
Leucine 7.40 7.57 6.45
Lysine 6.30 7.87 6.55
Methionine 2.04 2.36 2.36
(+ Cysteine) 4.31 6.52 3.17
Phenylalanine 4.16 3.60 3.52
Threonine 4.72 4.17 3.90
Valine 5.40 5.15 4.45
Antinutritional factors
Glucosinolates ( μ mol/g) 3.03 1.32
Phytic acid (g/100 g) 3.34 1.77
Σ SAE c (g/kg) not determined 0.13
thereof SA (g/kg) 0.04
thereof SIN (g/kg) <0.01
thereof SG (g/kg) <0.01
a

Nitrogen free extract = 100 – (%crude protein +%crude fat +%ash +%fibre).

b

Calculated by: crude protein =23.9 MJ/kg; crude fat =39.8 MJ/kg; NfE, fibre: 17.6 MJ/kg. Tryptophane was not analyzed.

c

Σ SAE= sum of sinapic acid and sinapic acid ester. SA =sinapic acid; SIN =sinapin; SG =sinapoylglucose.

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