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KMID : 1024420130170040396
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Food Engineering Progress
2013 Volume.17 No. 4 p.396 ~ p.400
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Antioxidant Properties of Pinus koraiensis Needle Powder Extracts as Influenced by Drying Methods
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Chung Ha-Sook
Kim In-Ho
Kim Seong-Ho
Lee Jun-Ho
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Abstract
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Korean pine needles have long been used in traditional Korean herbal medicine. Hence, pine needle extract was pre-pared as powder using 50% ethanol extraction followed by various drying methods such as hot-air drying, vacuumdrying, and freeze drying. With these extracts, the effects of the drying methods on the total phenolic content andantioxidant activities were assessed. As a result, vacuum drying resulted in the highest yield, whereas hot-air driedextract contained the least amount of total phenolic compounds. However, the extracts by hot-air drying showed thehighest amount of total flavonoids in comparison with the extracts obtained by other drying methods (p<0.05). Incase of freeze dried samples, there was much stronger 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) radical scavenging activities than in other samples (p<0.05). The nitratescavenging activities of all samples at high acidic conditions were higher than 80%, and that of the vacuum driedsample showed a significantly higher value (p<0.05). t-Cinnamic acid was the major phenolic acid regardless of dry-ing method applied.
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KEYWORD
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Pinus koraiensis, needle powder, ethanolic extracts, DPPH free radical scavenging, ABTS, total phenolic content, drying methods
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