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http://dx.doi.org/10.11002/kjfp.2011.18.3.341

Nutritional Components and Antioxidative Activities of Jujube (Zizyphus jujuba) Fruit and Leaf  

Kim, Il-Hun (Department of Food Science and Technology, Institute of Agricultural & Life Sciences, Gyeongsang National University)
Jeong, Chang-Ho (Wooyang Frozen Food Co, Ltd.)
Park, Soo-Jeong (Department of Horticulture, Gyeongsang National University)
Shim, Ki-Hwan (Department of Food Science and Technology, Institute of Agricultural & Life Sciences, Gyeongsang National University)
Publication Information
Food Science and Preservation / v.18, no.3, 2011 , pp. 341-348 More about this Journal
Abstract
The nutritional components and antioxidative activities of jujube fruit and leaf were investigated and analyzed to provide basic data for functional food materialization and processing. The nitrogen-free extract contents of the fruit and leaf were 71.92% and 41.51%, respectively. The mineral components of the fruit and leaf were rich in Ca (72.14 and 3,252.09 mg/100 g), K (899.82 and 1,708.12 mg/100 g), and P (172.11 and 286.28 mg/100 g), respectively. The major free sugars of the fruit were glucose (13.01 %) and fructose (7.35%); and of the leaf, sucrose (3.94%) and fructose (0.75%). The ascorbic acid contents were higher in fruit (135.73 mg/100 g) than in the leaf (100.43 mg/100 g). The analysis of the component amino acid showed a relatively high ratio of glutamic acid, aspartic acid, proline, and essential amino acids of leucine, but a low methionine and cystine content. The ABTS and FRAP assays indicated that the butanol fraction of the leaf was a more potent radical scavenger and reducing agent than the other five solvent fractions. The butanol fraction of the leaf also presented inhibitory effects against lipid peroxidation in a dose-dependent manner. Therefore, this study verified that the butanol fraction of the leaf has strong antioxidative activities that are correlated with its high level of phenolics, particularly rutin and quercitrin. These phenolics of jujube leaf can be utilized as effective and safe functional food substances, i.e., natural antioxidants.
Keywords
jujube; fruit; leaf; nutritional components; antioxidative activity;
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Times Cited By KSCI : 5  (Citation Analysis)
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