WANG Rei, XIE Xiao-lin, MA Li-zhi, WEN Guang-zhong, LIU Zhi-gang, LIU Xiao-yan, DU Chao, WANG Jun
A comprehensive study was performed including aromatic composition,nutritional components,and in vitro antioxidant capacity for 7 varieties of blueberry flowers in Majiang,Guizhou Province. The results showed that 63 compounds identified by SPME-GC / MS from 7 varieties of blueberry flowers were mainly composed of esters,aldehydes and ketones. Obvious difference was found in their species and content. All aromatic components were mainly composed of methyl benzoate,acetone,nitrogen monoxide and n-butyl ether,and total relative content was more than 49. 32%. In flowers,lower anthocyanin contents( 0. 52 ~ 1. 40 mg /100 g) and higher polyphenol contents( 1. 81 ~4. 27 mg / g) were determined,respectively. Average mineral element contents were also determined : Fe( 55. 25 g /g) 、Mn( 20. 31 g / g) 、Zn( 4. 31 g / g) 、Cu( 4. 28 g / g),four toxic elements As,Hg,Pb,Cd were not detected. The evaluation in vitro of antioxidant capacity compared to Vc solution,DPPH,hydroxyl and superoxide anion free radical scavenging ability were performed. As a result,obvious difference were found in the in vitro antioxidant capacity; all water extracts provided lower hydroxyl free radical scavenging activities compared to Vc solution; as for DPPH and superoxide anion free radical scavenging,all water abstracts showed higher activities,and the Climax activity was closed to Vc. In summary,blueberry flower resource could be utilized because of its nutritional components.