In this study, 6 agarwood samples were analyzed and compared with healthy fresh white wood (Table 1). The C1
and C2 agarwood samples were preliminarily assessed by senior collectors with extensive experience from the
Agarwood Association of Hainan, China.
Various characteristics of the agarwood were then assessed by thin-layer chromatography (TLC), including
ethanol-soluble extract content and essential oil content [7]. TLC silica gel 60 F254 glass plates were purchased from
Merck. The main compounds in the essential oil were identified using GC–MS or GC–RI, which was mature method
and developed by Huaiqiong Chen in our laboratory. The stability and reproducibility of the method has been tested in
her manuscript [8].