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Table 2 Effect of various nitrogen sources on production of alpha-galactosidase (using 2% defatted copra meal, dFCO)

From: High-yield production and biochemical characterization of α-galactosidase produced from locally isolated Penicillium sp.

Nitrogen source (0.5% in the medium)

Maximum mannanase activity (U/ml)

Penicillium sp.

Inorganic nitrogen source

 Ammonium sulfate

5.729 ± 1.39

 Ammonium nitrate

6.325 ± 1.55

 Sodium nitrate

5.446 ± 1.25

 Potassium nitrate

5.623 ± 1.30

 Ammonium acetate

5.429 ± 1.14

 Urea

5.463 ± 1.30

Organic nitrogen source

 Yeast extract

6.736 ± 1.62

 Beef extract

5.821 ± 1.30

 Peptone

5.916 ± 1.47

 Casein

5.431 ± 1.30

 Soybean meal (defatted)

5.402 ± 0.99

Combined form*

 Yeast extract + ammonium nitrate

6.672 ± 2.00

 Peptone + ammonium nitrate

5.838 ± 1.80

 Casein + ammonium nitrate

5.841 ± 1.43

 Soybean meal + ammonium nitrate

5.624 ± 1.30

  1. Results are the representative of average of three experiments in duplicate
  2. SE at 5% level