Abstract
Sporidiobolus salmonicolor CCRC 21975 was immobilized in κ-carrageenan, chitosan, agarose or calcium alginate. Due to the detrimental effects of high temperature attained during the gelling processes of κ-carrageenan and agarose as well as the toxicity of chitosan to the test organism, immobilization of S. salonicolor with these matrices for the production of γ-decalactone was inadequate. Neither viable cells nor production of γ-decalactone could be detected in media after 4 days cultivation of S. salmonicolor immobilized with κ-carrageenan or chitosan. Fewer viable cells and little γ-decalactone production was found in media with agarose-immobilized cells. In contrast, no significant reduction in the viable population was noted during immobilization procedures using alginate. Alginate-immobilized S. salmonicolor cells showed less susceptibility to ricinoleic acid toxicity and produced more γ-decalactone than did free cells. Time courses of γ-decalactone production by S. salmonicolor also revealed that immobilized cells produced a maximum γ-decalactone yield of ca. 131·8 mg l −1 after 5 days fermentation, compared with a maximum of ca. 107·5 mg l −1 for free cells.
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