Abstract
Laccaria fraterna, a basidiomycetous, filamentous, non-sporulating (in vitro) fungus, was subjected to freeze-drying and tested for viability after rehydration. The optimization of the freeze-drying protocol included selection of the candidate fungus; optimizing physiological growth conditions and age; standardizing the protectant type and concentration; optimizing the pre-freezing method, freeze-drying run and extent of drying; choice of the rehydrant and the extent of rehydration. The culture retained its viability after lyophilization and when subjected to quality assurance tests gave consistent results similar to the non-lyophilized culture, indicating the stability of the product and the applicability of the developed process to freeze-dry vegetative mycelium of filamentous non-sporulating fungi.
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