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.
Quality control (QC) of metabolomic analysis using the liquid chromatography–mass spectrometry/time‐of‐flight mass spectrometry system. (a) Total ion chromatograms in the positive and negative ion modes. The peak retention time and peak area of the QC samples overlap well; (b) Unsupervised principal component analysis results in the positive and negative ion modes. QC samples are tightly packed together, indicating that the quality of the samples is high
