Menthol and Geraniol Biotransformation and Glycosylation Capacity of Levisticum officinale Hairy Roots

Abstract

The biotransformation capacity of Levisticum officinale W.D.J. Koch hairy root cultures was studied by evaluating the effect of the addition of 25 mg/L menthol or geraniol on morphology, growth, and volatiles production. L. officinale hairy root cultures were maintained for 7 weeks in SH medium, in darkness at 24 °C and 80 r. p. m., and the substrates were added 15 days after inoculation. Growth was evaluated by measuring fresh and dry weight and by using the dissimilation method. Volatiles composition was analyzed by GC and GC-MS. Hairy roots morphology and growth were not influenced by substrate addition. No new volatiles were detected after menthol addition and, as was also the case with the control cultures, volatiles of these hairy roots were dominated by (Z)-falcarinol (1 – 45 %), n-octanal (3 – 8 %), palmitic acid (3 – 10 %), and (Z)-ligustilide (2 – 9 %). The addition of geraniol induced the production of six new volatiles: nerol/citronellol/neral (traces - 15 %), α-terpineol (0.2 – 3 %), linalool (0.1 – 1.2 %), and geranyl acetate (traces – 2 %). The relative amounts of the substrates and some of their biotransformation products decreased during the course of the experiment. Following the addition of β-glycosidase to the remaining distillation water, analysis of the extracted volatiles showed that lovage hairy roots were able to convert both substrates and their biotransformation products into glycosidic forms.

Abbreviations

GC:gas chromatography

GC-MS:gas chromatography-mass spectrometry

SH:Schenk and Hildebrandt (1972) culture medium

Levisticum officinale - Apiaceae - hairy roots - biotransformation - glycosylation - β-glycosidase - geraniol - menthol

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