Fig. 1. Total ion chromatograms from a urine sample without (A) or with (B) urea treatment. Note the disappearance of urea with urease treatment. One mL of sample, with GHB concentration of 100 mg/L, was used for analysis.
Fig. 2. Mass spectra of a urine sample without (A) or with (B) urea treatment. Sample without urease treatment shows only 43% match whereas the sample treated with urease shows 91% match to pure GHB (C).
Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?
To request a reprint or corporate permissions for this article, please click on the relevant link below:
Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?
Obtain permissions instantly via Rightslink by clicking on the button below:
If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.