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Antioxidant Effects of Ulmus davidiana Extracts on Various Oil  

Lim, Yong-Suk (Faculty of Hotel-Cuisine, Daegu Polytechnic College University)
Publication Information
Food Science and Preservation / v.17, no.1, 2010 , pp. 107-116 More about this Journal
Abstract
We prepared extracts from Ulmus davidiana (root, Korean source; URK) and Ulmus davidiana (bark, Korean source; UBK). URK extracts obtained with all tested solvents showed the highest antioxidant effects on fish oils. Both treatments containing 0.1% (v/v) extract from URK and UBK each showed that peroxide values of 30 meq/kg were maintained for 6 h and levels of 40 meq/kg were apparent for up to 18 h, indicating that antioxidative activity seemed to sustain during all tested time periods. Compared with commercial antioxidants, butanol and methanol extracts diluted to 0.05% (v/v) had similar antioxidative effects. Water and butanol UBK extracts diluted to 0.1% (v/v) both showed the highest antioxidative activities. After addition of metal ions, methanol and butanol URK extracts diluted to 0.1% (v/v) showed enhanced antioxidative activity. UBK ethanol extracts displayed superior antioxidative activity and a constant peroxide value throughout storage. However, in the case of Perilla oil, $\alpha$-tocopherol which is known as a natural antioxidant did not show any antioxidative activity except in the BHT. Methanol and butanol URK extracts diluted to 0.2% (v/v) showed superior antioxidative activities throughout the experiment. A methanolic UBK extract (0.2%, v/v) also had a similarly increased antioxidative effect. In tests involving addition of metal ions to all extracts, the methanolic UBK extract (0.2%, v/v) showed excellent antioxidative activity. When lard was tested, antioxidant levels did not differ significantly among extracts prepared using four different solvents at either 0.05% or 0.1% concentrations (both v/v). Addition of metal ions at levels of 0.05% or 0.1% (w/v) to these extracts had no significant additive effect on oxidation.
Keywords
Ulmus davidiana; antioxidative effect;
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