The calibration of the electrophoresis capillaries for oligomers needs
several well known molecular weight oligomers which are not always av
ailable. We propose an autocalibration adapted for oligonucleotides, b
ased on enzymatic polymerization of the nucleoside triphosphates, each
electropherogram peak of the reactive mixture being attributed to a m
olecular weight, independently of the polymerase activity.