ZENG Dan, LI Xu, GAO Pei, et al. Establishment of Antioxidant Activity System from Pyracantha Fortuneana Fruits by DPPH Evaluation Method[J]. Chinese journal of experimental traditional medical formulae, 2014, 20(21): 79-83.
ZENG Dan, LI Xu, GAO Pei, et al. Establishment of Antioxidant Activity System from Pyracantha Fortuneana Fruits by DPPH Evaluation Method[J]. Chinese journal of experimental traditional medical formulae, 2014, 20(21): 79-83. DOI: 10.13422/j.cnki.syfjx.2014210079.
Objective: To establish evaluation method on antioxidant activity of Pyracantha Fortuneana extract by DPPH. Method: The effect of DPPH and ethanol concentration
light
temperature and pH on relative absorbance of DPPH ethanol solution
as well as the effect of reaction time and temperature
pH
light and ethanol concentration diluting Pyracantha Fortuneana extract were both investigated thoroughly. Result: DPPH ethanol solution must be prepared just before using and can be saved in the refrigerator (2 ℃) for no more than 4 hours without light
whose concentration should be controlled between 0.02 and 0.2 mmol·L-1. The absorbance of sample solution could be measured at 517nm after being diluted with anhydrous ethanol and reacted for 30 min under 25 ℃ excluding light
along with the optimal pH is from 3 to 8.We had better controlled the sample dilution times and ensured that DPPH clearance ratio is between 17.70% and 53.43%. Conclusion: This evaluation method is reliable and stable