Abstract:Cichoric acid is one of the main functional components of dandelion. To make full use of dandelion resources，the paper studied the dissolution characteristics and antioxidant activity of cichoric acid of dandelion with dandelion powder particle size，solid-liquid ratio，and extraction temperature.The results showed that the powder particle size，solid-liquid ratio，and extraction temperature of dandelion did not affect the dissolution characteristics of cichoric acid，but affected the dissolution amount and average dissolution rate of cichoric acid.When the extraction time was less than 60 min，the dissolution amount increased rapidly and the average dissolution rate decreased rapidly. When the extraction time was more than 60 min，the dissolution increased slowly and the average dissolution rate decreased slowly.The dissolution amount and average dissolution rate of cichoric acid in dandelion increased with the decrease of dandelion powder particle size，increased with the increase of extraction temperature，and first increased and then decreased with the increase of solid-liquid ratio.The optimal extraction conditions of dandelion cichoric acid were dandelion powder particle size of 60 mesh，solid-liquid ratio of 1 ∶30（g/mL），and extraction temperature of 80 ℃. Cichoric acid was an important antioxidant component in the ethanol extract of dandelion，which had strong antioxidant capacity. Antioxidant results showed that the scavenging rates of DPPH free radical and ABTS+·increased linearly with the increase of cichoric acid concentration，and the effect of scavenging DPPH free radical was better than that of scavenging ABTS+·.