Sample Information. A total of 19 plant samples and reference standards including leaves, seeds, leaf extracts, and sarcotesta, and 21 commercial herbal dietary supplements containing extracts of G. biloba leaves were analyzed. The dietary supplement samples were purchased at food supermarkets, local retail pharmacies, or online resources. The detailed information for the plant samples and herbal dietary supplements are given in Tables 1 and 2, respectively.
Specimens of all samples are deposited at the botanical repository of the National Center for Natural Products Research (NCNPR), University of Mississippi (documented with NCNPR accession code).