Structure of the D-mannan and D-arabino-D-galactan in in Crithidia fasciculata: changes in proportion with age of culture

SYNOPSIS. Cells of the insect flagellate Crithidia fasciculata contained mannan and arabinogalactan components, whose porportion varied with culture age, the former predominating during early stages, and the latter during the later stages of exponential growth and the deceleration phase. The mannan was a β‐D‐(1→2)‐linked D‐mannopyranan. The arabinogalactan had a complex structure containing, in part, a β‐D‐(1→‐3)‐linked galactopyranose main‐chain substituted in the 2 positions by single‐unit D‐arabinopyranose side‐chains and with some unsubstituted units.