Method for degrading glycogen present in a biomass of galdieria

A method for treating a biomass of unicellular red algae (URA) of the genus Galdieria, said URA biomass treatment method comprising the steps of:

• a) harvesting of biomass by separating the culture medium to obtain a raw biomass of URA,
• b) cell lysis of the crude biomass from step (a) to obtain a lysate;
• c) optional dilution of the lysate from step (b) to obtain a solubilizate;
• and,
• d) separation of insolubles suspended in the lysate from step (b) or the solubilizate from step (c) to obtain a clarified fraction, further comprising a step of glycogen degradation in which the raw biomass and/or lysate and/or if applicable solubilizate is kept at rest (step of rest) for at least 3 hours, during which the liquid medium comprising glycogen is at acidic pH.