ABSTRACT
The present study aimed to study the preliminary phytochemical analysis, standardisation and in vitro antioxidant evaluation of Hippophae salicifolia (HS) berries extracts. Briefly, the berries were subjected to alcoholic and aqueous extraction. The preliminary phytochemical analysis was performed for aqueous and alcoholic extracts. The aqueous and alcoholic extracts are standardised for total phenolic, total tannin and total flavonoid content. The extracts were evaluated for its in-vitro free radical scavenging activities against, 2’-diphenyl-1- picrylhydrazyl (DPPH) radicals, hydroxyl radicals, nitric oxide radicals and total antioxidant activity. We found that alcoholic extract showed the presence of alkaloids, phenols,tannins, saponins, flavonoids and aqueous extract showed the presence of flavonoids, tannins, carbohydrates, and phenols. The extracts of HS berries were standardized for their total phenolic, tannin, flavonoid and vitamin-C content. The in vitro antioxidant activity revealed that both the extracts showed significant scavenging activities against free radicals. It can be concluded that both the extracts are effective in scavenging the free radicals. The flavonoids, tannins, vitamin-c and saponins may be attributed to free radical quenching activity of Hippophae salicifolia.
ABSTRACT
Hippophae salicifolia, Elaeagnus pyriformis, Myrica esculenta and M. nagi are actinorhizal plants growing in the sacred forests of Northeast India with multipurpose uses. The present investigation was undertaken to determine the phenol, flavonoid and flavonol contents of the fresh fruit juice of these plant species including the antioxidant potential by means of DPPH, H2O2 and NO scavenging activity and FRP. The total phenolic, flavonoid and flavonol contents of fruit juice ranged from 321.68±0.06 to 76.67±0.01 mg/g GAE, 272.92±0.07 to 20.12±0.02 mg/g QE and 258.92±0.08 to 18.72±0.02 mg/g QE, respectively. At 2.0 mg/mL concentration, DPPH scavenging activity was found to be the highest in M. esculenta (89.62%) and the lowest in E. pyriformis (17.58%). The reducing power activity was found significantly higher in H. salicifolia juice, which increased with increase in concentration. The H2O2 scavenging activity of H. salicifolia juice was found to be as high as 98.78%, while Elaeagnus juice was found to be less effective with just 48.90%. Juice of H. salicifolia showed the greatest NO scavenging effect of 75.24% as compared to juice of E. pyriformis, where only 37.54% scavenging was observed at the same concentration. Taking into account all the experimental data, it can be said that the fruits of H. salicifolia and both M. nagi and M. esculenta have good antioxidant activity compared to fruits of E. pyriformis.