Study of antioxidant activity and free radical scavenging power of Rheum Ribes flower extract

In recent years, the use of synthetic antioxidants and the degradation products derived from them is limited, because they are toxic and carcinogenic. So, studying on the use of natural antioxidants to replace the synthetic antioxidants is very important. Natural antioxidants are healthier and have more benefits and fewer harmful side effects. In this study, first, the Rheum Ribes of flower was extracted by maceration method with methanol. The extract’s phenolic compounds and inhibitory activity of free radicals were evaluated in different concentrations (100, 150, 200, 250 and 300 ppm) by Folin-Ciocalteu method and DPPH test, respectively and then, compared with the synthetic antioxidant of BHT at the constant concentration of 200 ppm. The results showed that the highest antioxidant properties of the extract was related to the concentration of 300 ppm and also the concentration of 250 ppm of the extract of Rheum Ribes of flower was equivalent to a concentration of 200 ppm of BHT in terms of free radical scavenging properties.Keywords: Rheum Ribes flower, Free radical scavenging power, Natural antioxidants, Phenolic compound

Study of antioxidant activity and free radical scavenging power of Physalis alkekengi flower extract

According to the undesirable effects of many chemical preservatives in food products such as oilseed extraction industry, the possibility of substituting these materials with effective compounds of herbal plants have been considered by the researchers. In this study, at first, the Physalis Alkekengi flower extract was extracted by using maceration method with methanol. The Phenolic compounds and the amount of free radical scavenging activity of the flower extract were investigated in different concentrations (200, 400, 600, 800 and 1000 ppm), respectively by Folin–Ciocalteu method and DPPH test and were compared with the synthetic antioxidant activity (BHT) at 200 ppm. The results showed a significant difference between different concentrations of Physalis Alkekengi flower extract, in terms of the rate of Phenolic compounds and free radical scavenging activity of flower extract (p < 0.05). In general, the results of this study showed that the methanol extract of Physalis Alkekengi flower, as a source of cheap and available natural antioxidant, after conducting supplementary experiments can be used in food industry.Keywords: Physalis Alkekengi flower, Free radical scavenging power, Natural antioxidants,Phenolic compounds