Quinones were
extracted as described by Tindall (1990a, b). Respiratory
lipoquinones were separated into their different classes by
TLC on silica gel (Macherey-Nagel), using hexane/tertbutylmethylether
(9 : 1, v/v) as solvent. UV absorbing bands
corresponding to the different quinone classes were removed
from the plate and further analysed by HPLC