Figure 1From: Stability study of opioids and benzodiazepines in urine samples by liquid chromatography tandem mass spectrometryMRM and quantification of norbuprenorphine in urine extract. (A) MRM transition for the quantifier ion. (B) MRM transition for the qualifier ion. (C) MRM transition for norbuprenorphine-d3 quantifier ion. (D) Six-duplicated-level calibration curve for norbuprenorphine. Concentration range (20 to 1,280 ng/mL); R 2 ≥ 0.995.Back to article page