Efficient Production of 4'-Hydroxydihydrochalcones Using Non-Conventional Yeast Strains.

The quest for novel therapeutic agents has rekindled interest in natural products, particularly those derived from biotransformation processes. Dihydrochalcones, a class of plant secondary metabolites, exhibit a range of pharmacological properties. Chalcone and dihydrochalcone compounds with the characteristic 4'-hydroxy substitution are present in 'dragon's blood' resin, known for its traditional medicinal uses and complex composition, making the isolation of these compounds challenging. This study investigates the efficient production of 4'-hydroxydihydrochalcones using non-conventional yeast strains. We evaluated the biotransformation efficiency of various 4'-hydroxychalcone substrates utilizing yeast strains such as KCh 71, KCh 464, KCh 4 and KCh 82, and KCh 242. Our findings revealed that KCh 71, KCh 4 and KCh 82, and KCh 242 exhibited the highest conversion efficiencies, exceeding 98% within one hour for most substrates. The position of methoxy substituents in the chalcone ring significantly influenced hydrogenation efficiency. Moreover, we observed isomerization of -4'-hydroxy-2-methoxychalcone to its isomer, catalyzed by light exposure. This study underscores the potential of using yeast strains for the sustainable and efficient production of dihydrochalcones, providing a foundation for developing new therapeutic agents and nutraceuticals.