Deproteinated A. niger biomass contains several covalently bound amino acids. The most abundant are arginine, serine, and proline in molar ratio of 3: 2: 2. One order of magnitude less is the amount of valine, phenylalanine, leucine and glycine. On deacetylation and separation of chitosan from glucan, the main three amino acids remain bound predominantly to chitosan, whereas the hydrophobic amino acids accompany mainly glucan. The presence of arginine could be the cause of stronger basicity of fungal chitosan compared to polyglucosamine.

• Compound ID: 15325
  

  -4)-b-D-GlcpNAc-(1-

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  Structure type: homopolymer
  Trivial name: chitin
  Compound class: O-polysaccharide, cell wall polysaccharide, glucan, polysaccharide, chitin
  Reference(s) to other database(s): GTC:G97099AY, CCSD:46067, CBank-STR:5851, GenDB:KF905651
  
   
  
  Aspergillus niger
  CSDB ID 101632 (all data & tools)