title: Biotechnological methods for chalcone reduction using whole cells of Lactobacillus, Rhodococcus and Rhodotorula strains as a way to produce new derivatives.
abstract: Microbial strains of the genera Dietzia, Micrococcus, Pseudomonas, Rhodococcus, Gordonia, Streptomyces, Pseudomonas, Bacillus, Penicillium, Rhodotorula and Lactobacillus were screened for the ability to convert chalcones. Synthesis of chalcones was performed by the Claisen-Schmidt reaction. There were three groups of chalcones obtained as the products, which included the derivatives containing 4-substituted chalcone, 2'-hydroxychalcone and 4'-methoxychalcone. The B ring of the chalcones was substituted in the para position with different groups, such as halide, hydroxyl, nitro, methyl, ethyl and ethoxy one. The structure-activity relationship of the tested chalcones in biotransformation processes was studied. It has been proven that Gram-positive bacterial strains Rhodococcus and Lactobacillus catalyzed reduction of C=C bond in the chalcones to give respective dihydrochalcones. The strain Rhodotorula rubra AM 82 transformed chalcones into dihydrochalcones and respective secondary alcohols. These results suggest that the probiotic strain of Lactobacillus can be used for biotransformations of chalcones, which has not been described before. The structure of new metabolites 14a and 15b were established as 4-ethoxy-4'-methoxydihydrochalcone and 3-(4-bromophenyl)-1-(4'-O-methylphenyl)-2-propan-1-ol, respectively, which was confirmed by (1)H NMR and (13)C NMR analysis.
authors.affiliation: Centre for Innovative Research in Medical and Natural Sciences, Faculty of Medicine, University of Rzeszów, Warzywna 1a, 35-310, Rzeszów, Poland. monika.stompor@gmail.com.|Department of Chemistry, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375, Wrocław, Poland. monika.stompor@gmail.com.
authors.forename: Monika
authors.initials: M
authors.lastname: Stompor
authors.affiliation: Department of Chemistry, Wrocław University of Environmental and Life Sciences, Norwida 25, 50-375, Wrocław, Poland.
authors.forename: Mateusz
authors.initials: M
authors.lastname: Kałużny
authors.affiliation: Department of Biotechnology and Food Microbiology, University of Environmental and Life Sciences, Chełmońskiego 37/41, Wrocław, 51-630, Poland.
authors.forename: Barbara
authors.initials: B
authors.lastname: Żarowska
mesh_terms: D001711:Biotransformation; D002599:Chalcone / Q000378:metabolism*; D007778:Lactobacillus / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D010084:Oxidation-Reduction; D012240:Rhodococcus / Q000378:metabolism*; D012248:Rhodotorula / Q000378:metabolism*
chemical_list: D002599:Chalcone
keywords: Chalcones; Dihydrochalcones; Gordonia; Lactobacillus; Microbial reduction; Rhodococcus