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.
Top: chemical structures of surrogate standard aloin and the assayed sennosides with the relevant protons marked in green (H-10 for total sennoside content) and red (H-6 for the content of sennosides A, B, and A1). Bottom: HSQC diagram of aloin indicating the respective cross peaks used for calibration.
