Skip to main content
. 2018 Nov 23;6:e6009. doi: 10.7717/peerj.6009

Figure 4. Chromatogram of reference standards.

Figure 4

(A) Oxalic acid; (B) Chlorogenic acid, caffeic acid and ferulic acid; (C) Gallic acid, tannin acid, vanillic acid and cinnamic acid.