“Whoa! It’s like Spotify but for academic articles.”

Instant Access to Thousands of Journals for just $40/month

Try 2 weeks free now

An automated screening system for benzodiazepines in human urine

A rapid flow system for determining the presence or absence of benzodiazepines in human urine has been developed and optimized. The system is based on the diazotization of the analytes in a pre-hydrolyzed samples at pH<1, followed by the formation of dyes with 1-naphthol at pH>12. The dyes are retained and washed on a XAD-2 minicolumn, and immediately eluted with 3 M NaOH in ethanol/water. A simple photometer is used at λ =550 or 600 nm to monitor the overall analyte content. The reliability of the proposed method for the benzodiazepines is demonstrated in simple chemometric terms, using four concentration levels (between 0.5 and 2 times the detection limit) and oxazepam as model benzodiazepine. The method is highly selective and a sensitive enough for detecting benzodiazepines in urine. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Analytica Chimica Acta Elsevier
Loading next page...

You’re reading a free preview. Subscribe to read the entire article.

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy unlimited access and
personalized recommendations from
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $40/month

Try 2 weeks free now

Explore the DeepDyve Library

How DeepDyve Works

Spend time researching, not time worrying you’re buying articles that might not be useful.

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from Springer, Elsevier, Nature, IEEE, Wiley-Blackwell and more.

All the latest content is available, no embargo periods.

See the journals in your area

Simple and Affordable Pricing

14-day free trial. Cancel anytime, with a 30-day money-back guarantee.

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches


Best Deal — 25% off

Annual Plan

  • All the features of the Professional Plan, but for 25% off!
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

billed annually