Protein fractions
NPN + Amines + Amides
+ AA + NH
3
+ Peptides
Peptides (> 9 AA) +
Proteins
Protein soluble in ND
A
B1
B2
*
C
Lanzas et al.
(2007)
ADIN
NDIN - ADIN
A
B1
B2
*
C
Fox et al.
(2004)
B3
Non amino-N
Amino-N
Extensins
Lignin-N, tannins-N,
Maillard products
Examples
Globulins
Albumins
Fraction A and B1 are soluble in Borate Phosphate Buffer. Fraction B2 precipitates with Trichloroacetic Acid (TCA); usually 9 AA long.