The basic composition (moisture, total carbohydrates, dietary fiber, crude fat, ash, nitrogen, and protein)
and amino acid contents were determined in the cultivated mushrooms Agaricus bisporus/white,
Agaricus bisporus/brown, Lentinula edodes, and Pleurotus ostreatus. In addition, nitrogen-to-protein
conversion factors were calculated for each species by dividing the sums of amino acid residues
with total (Kjeldahl) nitrogen contents. The dry matter contents of mushrooms varied from 7.7% to
8.4%. The dry matter of mushrooms contained large amounts of carbohydrates, from 4.5 (A. bisporus/
white) to 5.8 g/100 g fresh weight (L. edodes). L. edodes proved to be an especially good source of
dietary fiber (3.3 g/100 g fresh weight); the other mushrooms contained 1.5-2.4 g/100 g fresh weight.
Crude fat, ash, and protein (based on amino acid analysis) contents of the mushrooms varied 0.31-
0.35, 0.49-0.78, and 1.8-2.09 g/100 g fresh weight, respectively. Mushrooms proved to be good
sources of almost all essential amino acids when compared with common vegetables. The mean
nitrogen-to-protein conversion factor analyzed in the present study was 4.7 ( 0.21. When using this
factor, a very good estimation of protein contents could be obtained for the main species of mushrooms
cultivated in Finland.
The basic composition (moisture, total carbohydrates, dietary fiber, crude fat, ash, nitrogen, and protein)and amino acid contents were determined in the cultivated mushrooms Agaricus bisporus/white,Agaricus bisporus/brown, Lentinula edodes, and Pleurotus ostreatus. In addition, nitrogen-to-proteinconversion factors were calculated for each species by dividing the sums of amino acid residueswith total (Kjeldahl) nitrogen contents. The dry matter contents of mushrooms varied from 7.7% to8.4%. The dry matter of mushrooms contained large amounts of carbohydrates, from 4.5 (A. bisporus/white) to 5.8 g/100 g fresh weight (L. edodes). L. edodes proved to be an especially good source ofdietary fiber (3.3 g/100 g fresh weight); the other mushrooms contained 1.5-2.4 g/100 g fresh weight.Crude fat, ash, and protein (based on amino acid analysis) contents of the mushrooms varied 0.31-0.35, 0.49-0.78, and 1.8-2.09 g/100 g fresh weight, respectively. Mushrooms proved to be goodsources of almost all essential amino acids when compared with common vegetables. The meannitrogen-to-protein conversion factor analyzed in the present study was 4.7 ( 0.21. When using thisfactor, a very good estimation of protein contents could be obtained for the main species of mushroomscultivated in Finland.
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