Content and Antioxidant Activity of Active Components in Different Parts of Gardenia jasminoides Ellis

To compare the active compounds in different parts of Gardenia jasminoides Ellis and evaluate their in vitro antioxidant activities, this study used the ultrasound-assisted method to extract the active compounds in different parts of Gardenia jasminoides Ellis and measured the yield. Their total iridoids, total crocins, total flavonoids and total polyphenols were measured by UV-visible spectrophotometer method. Their active compound monomers were measured by HPLC method. DPPH and ABTS+ radical scavenging methods were used to valuate their in vitro antioxidative activities then the correlation analysis was founded between the contents of active compounds and IC50 of DPPH and ABTS+ radical. Gardenia jasminoides Ellis leaf had the highest total iridoids contents and total polyphenols contents, which were 244.87±5.89 mg·g−1 and 16.71±0.55 mg·g−1 respectively. Results showed that, theGardenia jasminoides Ellis fruit had the significantly highest total crocins contents (P