Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Example GC/MS extracted ion chromatograms from a derivatized market milk sample: (A) internal standard xanthyl-propionamide (m/z 253), (B) xanthyl-acetamide (m/z 239), (C) xanthyl-d3-acetamide (m/z 242), which was not added or detected, and (D) xanthyl-d3-acetamide in the same market milk sample after spiking with 250 ppb d3-acetamide before derivatization with 9-xanthydrol. All peaks are normalized to the same highest ion count (internal standard) to facilitate comparison.
