FIGURE 1.
(a–d) Extraction cycle for (a) trigonelline, (b) caffeine, (c) chlorogenic acid, and (d) coffee sample
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.