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.
(a) HPLC gradients of the participating untargeted LC–MS platforms including the retention times of trigonelline, hesperetin and ursolic acid plotted against the percentage of solvent B. The numbers of the platforms correspond with Table 1. Platform 7 had separate HPLC methods for positive and negative ionization modes; (b) The same gradients normalized based on a column with dimensions of 2.1 × 100 mm, particle size 1.7 µm, and flow rate 0.4 mL/min.
