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Int. J. Mol. Sci. 2011, 12(5), 2935-2945; doi:10.3390/ijms12052935
Article

Flavonoids, Phenolics, and Antioxidant Capacity in the Flower of Eriobotrya japonica Lindl.

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Received: 23 February 2011 / Revised: 23 March 2011 / Accepted: 22 April 2011 / Published: 4 May 2011
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Abstract

Flavonoids and phenolics are abundant in loquat flowers. Methanol had the highest extraction efficiency among five solvents, followed by ethanol. Considering the safety and residue, ethanol is better as extraction solvent. The average content of flavonoids and phenolics of loquat flower of five cultivars were 1.59 ± 0.24 and 7.86 ± 0.87 mg/g DW, respectively, when using ethanol as extraction solvent. The contents of both bioactive components in flowers at different developmental stages and in the various flower tissues clearly differed, with the highest flavonoids and phenolics content in flowers of stage 3 (flower fully open) and petal, respectively. The antioxidant capacity was measured using FRAP, DPPH, and ABTS methods. The values of ABTS method was highest, followed by DPPH, the lowest was FRAP, when using vitamin C equivalent antioxidant capacity (VCEAC) as unit. Correlation analysis showed that the ABTS method showed the highest correlation coefficients with flavonoids and phenolics, i.e., 0.886 and 0.973, respectively.
Keywords: Eriobotrya japonica; flower; flavonoids; phenolics; antioxidant capacity Eriobotrya japonica; flower; flavonoids; phenolics; antioxidant capacity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhou, C.; Sun, C.; Chen, K.; Li, X. Flavonoids, Phenolics, and Antioxidant Capacity in the Flower of Eriobotrya japonica Lindl.. Int. J. Mol. Sci. 2011, 12, 2935-2945.

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