Published in:
ELECTROPHORESIS, 9 (1988) 4, Seite 172-182
Language:
English
DOI:
10.1002/elps.1150090405
ISSN:
0173-0835;
1522-2683
Origination:
Footnote:
Description:
AbstractImmobilized pH gradient gel rods, 1.5 mm in diameter, were cast with a manifold connected to high‐precision burettes. The reproducibility of gel length was ca. 1.7 mm. The average standard deviation σx for spot position was 2 mm after one‐dimensional and 5.8 mm after two‐dimensional runs. In order to bring to completion the elution of the salt fronts into the electrode compartments, carrier ampholytes had to be included in the gel formulation at concentrations of at least 0.5–1%, depending on the pH range. The presence of carrier ampholytes, however, was troublesome in two respects: the gel tended to shrink and the cathodic bands drifted with time. Ionic components in the sample were tolerated up to the following concentrations: NaCl 8 μmoles, sodium dodecyl sulfate 10 μg per tube. In presence of non‐ionic detergents, the gels moved as a whole towards the cathode.