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Table 2 Enzymes released by Aspergillus niger detected by the APY-ZYM® system

From: Characterization and optimization of extracellular enzymes production by Aspergillus niger strains isolated from date by-products

Enzymes Strains
ASP2 ASP6 ASP28 ASP31 ASP32
Phosphatase alkaline 5 1 5 4 1
Esterase (C4) 5 2 5 4 2
Esterase lipase (C8) 5 2 5 4 1
Lipase (C14) 0 0 0 0 0
Leucine arylamidase 4 2 3 2 1
Valine arylamidase 2 0 0 0 0
Cystine arylamidase 0 0 0 0 0
Trypsin 0 0 0 0 0
Chymotrypsin 2 0 0 2 0
Phosphatase acid 5 5 5 4 4
Naphthol-AS-BI-phosphohydrolase 5 4 4 5 3
α-Galactosidase 2 1 0 1 0
β-Galactosidase 2 1 0 0 0
β-Glucuronidase 0 0 0 0 0
α-Glucosidase 3 1 2 2 0
β-Glucosidase 5 4 4 4 3
N-acetyl-β-glucosaminidase 4 5 4 4 3
α-Mannosidase 0 0 0 0 0
α-Fucosidase 0 0 0 0 0
  1. The scale of the API-ZYM® test was used for enzyme quantification, with 0=not detected activity, 1=5 nmol substrate metabolized, 2=10 nmol, 3=20 nmol, 4=30nmol, and 5 ≥40 nmol