Near-ultraviolet absorption bands of some amino acids and nucleotides

Substance
pH
lmax(nm)
e(liter/cm*mole)
Phenylalanine
6
257
200
Tyrosine
6
275
1,300
Tryptophan
6
280
5,000
Adenosine-5'-phosphate
7
259
15,000
Cytidine-5'-phoosphate
7
271
9,000
Uridine-5'-phosphate
7
262
10,000
Guanosine-5'-phosphate
7
252
14,000