Fig. 3From: GC-FID determination of nucleobases guanine, adenine, cytosine, and thymine from DNA by precolumn derivatization with isobutyl chloroformateChromatogram of the acid-hydrolyzed human blood DNA samples (1) A, (2) T, (3) G, and (4) C as IBCF derivatives. GC conditions as in Fig. 1 Back to article page