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

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

1 College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, China 2 Laboratory of Fruit Quality Biology, The State Agriculture Ministry Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Zhejiang University, Zijingang Campus, Hangzhou 310058, China
* Author to whom correspondence should be addressed.
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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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 (CC BY 3.0).

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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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