tAn Arxula adeninivorans based microbial biosensor has been developed for the determination of pharma-ceuticals and chemicals such as omeprazole, lansoprazole, -naphtoflavone and methylcholanthrenewithin 5 h using biochemical detection and 4 h and 10 min using amperometric detection. The biosen-sor consists of genetically modified A. adeninivorans G1212/YRC102-hAhR-hARNT-phyK (hAhR – humanarylhydrocarbon receptor; hARNT – human arylhydrocarbon receptor nuclear translocator; induciblephyK – derived from Klebsiella sp. ASR1) as the biological component and coupled with either a bio-chemical or an amperometric detection method. The combination between hAh receptor gene, hARNTand the A. adeninivorans-derived glucoseamylase promoter of the reporter gene (GAA) containing specificcyp1A1-derived core sequence created a construct which enabled specific induction by pharmaceuticals.This offers a new cell-based biosensor for the pharmaceutical determination. The half maximum effec-tive concentration (EC50) and the limit of detection (LoD) were found to be 236.13, 95.01 and 174.72,83.65 g/l for omeprazole and lansoprazole, respectively. These two pharmaceuticals are among themost widely used internationally. Additionally A. adeninivorans G1212/YRC102-hAhR-hARNT-phyK cellsallow the measurement in raw wastewater, i.e. not concentrated, unpurified and untreated which willallow on-site operation in sewage treatment plants.