Extraction of anthocyanins from Clitoria ternatea L. petals in Vietnam and determination of its antioxidant and antimicrobial activities

In this study, the effects of various factors on anthocyanins extracted from ClitoriaTernatea L. petals were determined. addition, phytochemical properties, antioxidant ability, antimicrobial capacity, and application extractions also investigated. As a result, highest proportion anthocyanin, 1.21 mg/g fresh weight (FW), was obtained when extracting with 100% methanol, solvent/sampleratio 10ml/g at 37oC for an hour. The total phenolic content (TPC) 24.7x103±8.55x102 µg gallic acid equivalent (GAE)/g FW, while figures flavonoid 18.8±0.149 mg quercetin (QE)/g FW. values 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging capacity activity EC50=904.1µg/ml 2.86x103±1.01x101 ascorbic (AAE)/g respectively. inhibitions to Staphylococcus aureus, Streptococcus mutans, Pseudomonas aeruginosa shown minimum inhibitory concentration (MIC) 90 mg/ml 180 mg/ml. It showed that petal extract had potential be developed into pH indicator, however, further study should carried out obtain highly qualified one.