Abstract
Verbenone is a natural monoterpene present as an essential component in rosemary oil from Rosmarinus officinalis, Verbena triphylla and Eucalyptus globule. Microbial biotransformation of monoterpenoids to value-added products has immense industrial potential. This study involves the biotransformation of (-)-verbenone to (-)-10-hydroxyverbenone by a fungus i.e. Talaromyces purpurogenus strain MRS-F13 in fermentation broth during the exponential phase. Biotransformation reaction has been successfully demonstrated at 15 L scale in the bioreactor with 70% conversion within 96 h. The anti-inflammatory activity investigations revealed that (-)-verbenone and its biotransformed product exhibited moderate inhibition of TNF-α and nitric oxide, whereas (-)-10-hydroxyverbenone presented an improved anti-oxidant activity. Highlights Talaromyces purpurogenus catalysed biotransformation of (-)-verbenone to (-)-10-hydroxyverbenone has been demonstrated. Approximately 70% bioconversion was obtained in 96 h in submerged culture at 15L bioreactor scale. Biotransformed product (-)-10-hydroxyverbenone has shown improved anti-inflammatory activity without cytotoxicity.
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