Assessment of validation and antioxidant activities of novel 12 Korean strawberry cultivars

Abstract

In this study, antioxidant activities of extracts of 12 Korean strawberry cultivars were evaluated and validation of an analytical method for ellagic acid, a marker compound, was carried out. Cultivar 'Josaenghongshim' had the highest total polyphenol and flavonoid contents. In addition, cultivar 'Josaenghongshim' had the highest value and cultivar 'Seolhyang' showing the highest activity. Ellagic acid contents of 'Suhong' , 'Okme' , and 'Dahong' cultivars were the highest ellagic acid content. Correlation coefficient of the calibration curve was 0.9999, showing very high linearity. The HPLC-DAD method for the quantitation of ellagic acid content showed high linearity at various concentration ranges, with a limit of detection of 2.35 μg/mL. The limit of quantification was 7.13 μg/mL. Relative standard deviations from intra-and inter-day precision were less than 5.13%. Recovery rates of ellagic acid at 10, 50, and 100 μg/mL, respectively, were 99.0-100.1% with RSD values less than 5.30%. These results provide viable information for the validation of antioxidant capacities of 12 cultivars of Korean strawberries.

Correlation analysis between soluble sugars of soybean and mucus drawing length of fermented natto

“…The soluble sugars were analyzed using the method of Ahmad et al (2022) and Lee et al (2022) with some modifications. Briefly, 0.15 g of crushed soybean powder and 1.5 mL of deionized water were added to a 2 mL centrifuge tube, which was placed in a constant temperature shaker at 37 °C for 2 h at 180 r/min and then centrifuged at 12,000 r/min for 10 mins.…”

Antioxidant, α-amylase and α-glucosidase inhibitory activities of Cedrela sinensis (A. Juss) leaf with ethanol extract concentration

“…The total polyphenol content was determined as Folin-Ciocalte method (Lee et al, 2022). To measure TPC, 150 μL of sample solution, 2,400 μL of distilled water and 50 μL of 2 N Folin-Ciocalteu reagen were mixed and then incubated for 3 min.…”