The conversion of 15N-enriched urea to a [1,3-15N2]cytidine derivative is accomplished in nine steps with an overall yield of 67%. Synthesis of a [4-15NH2]cytidine derivative is achieved by thiolation of the corresponding uridine derivative with Lawesson's reagent and amination with 15N-enriched amm
β¦ LIBER β¦
Monitoring of 2,4-decadienal in oils and fats used for frying in restaurants in Athens, Greece
β Scribed by Nikolaos K. Andrikopoulos; Antonia Chiou; Anastasia Mylona; George Boskou; George V. Z. Dedoussis
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 119 KB
- Volume
- 106
- Category
- Article
- ISSN
- 1438-7697
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## Abstract Four deuteriumβlabelled compounds were prepared for use as internal standards in the quantification of methamphetamine, DOM, PCP, and methaqualone at low levels in body fluids by selected ion monitoring. The need for standards containing more than three deuterium atoms per molecule and