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The conversion of exogenous p -hydroxybenzaldehyde into p -hydroxy-methyl-phenol-β-D-glucoside (gastrodin) was studied using cell suspension cultures of Datura tatula L. The chemical structure of the synthesized gastrodin was identified on the basis of spectral analysis and chemical evidence. The procedure of conversion of p -hydroxybenzaldehyde into gastrodin by D. tatula L. cell suspension cultures was established. The synthesized gastrodin (II) was isolated from the ferment liquor and identified by spectral analysis. Simultaneously, the p- hydroxybenzyl alcohol (I) that was converted through biotransformation of p -hydroxybenzaldehyde by cell suspension cultures of D. tatula L. was also isolated and identified. The efficiency of glucosylation of p -hydroxybenzaldehyde was remarkably enhanced by the addition of salicylic acid (0.1 mg/L) and the maintenance of low pressure (0.001 MPa) in a 25-L airlift loop bioreactor. The biotransformation of exogenous p -hydroxybenzaldehyde to gastrodin using cell suspension cultures of D. tatula L. is a promising approach.