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Quality Characteristics and Antioxidant Activity of Doenjang Made from Lipoxygenase-Free Genotypes Soybeans
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 Title & Authors
Quality Characteristics and Antioxidant Activity of Doenjang Made from Lipoxygenase-Free Genotypes Soybeans
Lee, Soo-Jung; Kim, In-Sung; Hu, Wen-Si; Ha, Eun-Seon; Chung, Jong-Il; Sung, Nak-Ju;
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To evaluate processing suitability of lipoxygenase (LOX)-free genotype soybeans (Jinyang, 05C4 and LS), quality characteristics and antioxidant activities of their Doenjang products were compared to those of Doenjang made from Taekwang soybean (LOX-present) as the control. Moisture and crude protein contents of Doenjang were significantly higher in LS than the control. Crude lipid content was not significantly different and was in the range of 7.92~8.22% in all samples. Carbohydrate content was significantly lower in LS than Taekwang. Content of reducing sugar in Doenjang was significantly higher in Jinyang than Taekwang. Contents of amino-type nitrogen were significantly higher in LOX-free cultivars than Taekwang. Colors of 05C4 and LS Doenjang were not different compared to that of Taekwang, whereas Jinyang Doenjang showed a noticeable color difference. Taekwang Doenjang had a slightly stronger savory taste than another sample. LOX-free cultivars had a strong salty taste. Flavor was the strongest in LS, whereas overall acceptability showed little difference among all samples. The total amino acid content was slightly higher in Jinyang and 05C4 than Taekwang, and content of essential amino acids was higher in Doenjang from LOX-free cultivars than Taekwang. Isoflavon content was significantly higher in Doenjang () made from LOX-free cultivars than in Taekwang (). Total phenol content was significantly higher in 05C4 and LS, and flavonoid content was significantly higher in LS than Taekwang. Antioxidant activities were highest in Jinyang based on DPPH radical scavenging and reducing power. ABTS radical scavenging activity was significantly higher in Doenjang made from LOX-free cultivars than Taekwang. These results suggest that Doenjang from LOX-free cultivars could have a suitable genotype for Doenjang processing since it is more effective in terms of amino acids, isoflavone contents, and antioxidant activity.
Doenjang;lipoxygenase-free genotypes;isoflavone;antioxidant activity;
 Cited by
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