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http://dx.doi.org/10.4014/kjmb.1401.01003

Antioxidative, Antimicrobial, and Anti-proliferative Activities of the Floret and Stalk of Broccoli (Brassica oleracea L.)  

Kim, Mi-Sun (Department of Food and Nutrition, Andong National University)
Lee, Ye-Seul (Department of Food and Nutrition, Andong National University)
Kwon, Ha-Young (Department of Food and Nutrition, Andong National University)
Kim, Jong Sik (Department of Life Science, Andong National University)
Sohn, Ho-Yong (Department of Food and Nutrition, Andong National University)
Publication Information
Microbiology and Biotechnology Letters / v.42, no.1, 2014 , pp. 58-66 More about this Journal
Abstract
In the course of study for a use for non-edible parts of broccoli (Brassica oleracea L), and the development of processed food utilizing these parts, edible floret and non-edible stalk were extracted with ethanol and different organic solvent fractions were prepared. With 10 different extracts and fractions, their useful components and various biological activities, such as antioxidant, antimicrobial and anti-proliferation activity, were investigated. The stalk has more abundant water soluble carbohydrate when compared with the floret, and floret has higher hexane-soluble pigments. Analysis of total flavonoid and total polyphenol contents showed that the floret has 1.5~1.99 times higher concentrations than the stalk. Among the fractions, ethylacetate (EA) fractions have the highest amount of total flavonoid and total polyphenol. The stalk and floret possessed 9.45 and 42.01 mg-total flavonoid/g, respectively. In the antioxidation activity assay, the EA fraction of floret showed strong radical scavenging activity and reducing power, while the n-hexane fraction of the stalk exhibited nitrite scavenging activity. In the antimicrobial activity assay, the EA fraction of floret showed a strong and broad-range of antibacterial activity, irrespective of gram positive or gram negative bacteria. In a while, the hexane and EA fractions revealed anti-proliferative effects against the human colorectal cancer cell HCT-116. Strong anti-proliferative activities were found in the hexane fraction of stalk (18.4% of cell viability), and the n-butanol fraction of floret (6.9% of cell viability). Our results suggest that the further study of the characterization of active fractions and the identification of active components from different parts of broccoli are needed to develop functional foods or novel plant-derived medicines.
Keywords
Brassica oleracea L floret; stalk; antioxidation; antimicrobial; anti-proliferation;
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Times Cited By KSCI : 22  (Citation Analysis)
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