This study was performed to investigate the antiinflammatory activities of taxifolin from Opuntia humifusa. A potent anti-oxidant activity was shown from the leaf extract at IC 50 value of 38.33±1.07 µg/mL and fruit extract at IC 50 value of 40.23±2.21 µg/mL by 1,1-diphenyl-2-picrylhydrazyl assay. Fraction of taxifolin from leaf extract identified using high performance liquid chromatography and gas chromatography/mass spectrometry. The results of cell viability indicated that taxifolin did not show cytotoxicity on RAW 264.7 cells at 500 µM of concentration. The result showed that taxifolin inhibited lipopolysaccharide (LPS)-induced production of Nitrite oxide. In addition, taxifolin inhibited LPS-induced tumor necrosis factor-α and interleukin-6 production by cytokine assay and cyclooxygenase-2 expression by western blot analysis, meaning taxifolin has a significant anti-inflammatory effect. Our results suggested that taxifolin from Opuntia humifusa showed anti-inflammatory activities. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons. org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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