Nat Prod Sci.  2019 Mar;25(1):44-48. 10.20307/nps.2019.25.1.44.

Antioxidant Activity and Phenolic Content of Different Parts of Lotus and Optimization of Extraction Condition using Response Surface Methodology

  • 1College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 28160, Republic of Korea.


Nelumbo nucifera Gaertn. (Nymphaeaceae) is commonly called lotus and its leaves are widely been used as functional ingredients due to its antioxidant activity. For maximum efficacy, optimized extraction condition was established using response surface methodology. The high F-values, low p-values and insignificant p-value for lack-of-fit supported the fitness of the model and yielded the second-order polynomial regression for the antioxidant activity. The optimized extract was obtained by the extraction of 1 g of lotus leaves with 40 mL of 50% MeOH at 10.0℃, which exerted 70.1% antioxidant activity. Close correlation between phenolic content and antioxidant activity suggested phenolic compounds as active constituents of lotus leaves. In addition, comparison of different parts of lotus demonstrated the most potent antioxidant activity of flowers, followed by leaves and roots. Taken together, these results provide useful information about lotus leaves for the development as antioxidant ingredients. In addition, flowers and roots as well as leaves are suggested as good sources for antioxidant activity.


Nelumbo nucifera; antioxidant; various parts; optimization; phenolic content; response surface methodology

MeSH Terms



  • Fig. 1 Structures and antioxidant IC50 values of compounds from lotus leaves.

  • Fig. 2 Response surface plots of antioxidant activity by MeOH concentration (X1), extraction temperature (X2) and solvent/sample ratio (X3).

  • Fig. 3 Correlation between antioxidant activity and phenolic content of the lotus leaves extract from different extraction condition.


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