GAs extract (95.66% purity) containing GA (13:0) (22.78%), GA (15:1) (46.49%), GA (17:2) (2.78%), GA (15:0) (3.65%) and GA (17:1) (19.96%) was prepared in our laboratory. GA (13:0) (150826), GA (15:1) (150914), GA (17:2) (160404), GA (15:0) (151101), and GA (17:1) (151027) were purchased from Sichuan Weikeqi Biological Technology CO., LTD. Salicylic acid (99.9% purity, 100166–201104) was bought from National Institutes for Food and Drug Control. Acetonitrile, methanol, and formic acid were HPLC-grade from Merck (Darmstadt, Germany) |