Keiko Azuma

Summary

Affiliation: National Institute of Agrobiological Sciences
Country: Japan

Publications

  1. ncbi request reprint Combination of lipids and emulsifiers enhances the absorption of orally administered quercetin in rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie 514 2392, Japan
    J Agric Food Chem 50:1706-12. 2002
  2. ncbi request reprint Enhancing effect of lipids and emulsifiers on the accumulation of quercetin metabolites in blood plasma after the short-term ingestion of onion by rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie, Japan
    Biosci Biotechnol Biochem 67:2548-55. 2003
  3. doi request reprint Structures and antioxidant activity of anthocyanins in many accessions of eggplant and its related species
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360 Kusawa, Ano, Tsu, Mie 514 2392, Japan
    J Agric Food Chem 56:10154-9. 2008
  4. doi request reprint Evaluation of tolerable levels of dietary quercetin for exerting its antioxidative effect in high cholesterol-fed rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360 Kusawa, Ano, Tsu, Mie 514 2392, Japan
    Food Chem Toxicol 48:1117-22. 2010
  5. ncbi request reprint [6]-Gingerol inhibits nitric oxide synthesis in activated J774.1 mouse macrophages and prevents peroxynitrite-induced oxidation and nitration reactions
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie 514 2392, Japan
    Life Sci 73:3427-37. 2003
  6. ncbi request reprint Mechanism of inhibition of peroxynitrite-induced oxidation and nitration by [6]-gingerol
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agriculture and Bio Oriented Research Organization, Mie, Japan
    Planta Med 71:563-6. 2005
  7. ncbi request reprint Primary structure analysis and functional expression of erythrose reductases from erythritol-producing fungi (Trichosporonoides megachiliensis SNG-42)
    Tetsuya Ookura
    National Food Research Institute, Ibaraki
    Biosci Biotechnol Biochem 69:944-51. 2005
  8. pmc Lowering effects of onion intake on oxidative stress biomarkers in streptozotocin-induced diabetic rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360, Kusawa, Ano cho, Tsu, Mie 514 2392, Japan
    J Clin Biochem Nutr 40:131-40. 2007
  9. ncbi request reprint Effect of naturally occurring organosulfur compounds on nitric oxide production in lipopolysaccharide-activated macrophages
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, 514 2392 Ano, Mie, Japan
    Life Sci 71:411-9. 2002

Collaborators

Detail Information

Publications9

  1. ncbi request reprint Combination of lipids and emulsifiers enhances the absorption of orally administered quercetin in rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie 514 2392, Japan
    J Agric Food Chem 50:1706-12. 2002
    ..Ethanol is not helpful for the effective absorption of quercetin, as a high concentration is required. In conclusion, a combination of lipids and emulsifiers is necessary for enhancing quercetin absorption...
  2. ncbi request reprint Enhancing effect of lipids and emulsifiers on the accumulation of quercetin metabolites in blood plasma after the short-term ingestion of onion by rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie, Japan
    Biosci Biotechnol Biochem 67:2548-55. 2003
    ..These results indicate that co-ingested lipids and emulsifiers could enhance the bioavailability of quercetin glucosides in onion...
  3. doi request reprint Structures and antioxidant activity of anthocyanins in many accessions of eggplant and its related species
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360 Kusawa, Ano, Tsu, Mie 514 2392, Japan
    J Agric Food Chem 56:10154-9. 2008
    ....
  4. doi request reprint Evaluation of tolerable levels of dietary quercetin for exerting its antioxidative effect in high cholesterol-fed rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360 Kusawa, Ano, Tsu, Mie 514 2392, Japan
    Food Chem Toxicol 48:1117-22. 2010
    ..These results indicated that the tolerable level for dietary quercetin for exerting its antioxidative effect was between 126 and 157 mg/kg/day for the quercetin diet and between 19 and 34 mg/kg/day for the onion diet...
  5. ncbi request reprint [6]-Gingerol inhibits nitric oxide synthesis in activated J774.1 mouse macrophages and prevents peroxynitrite-induced oxidation and nitration reactions
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, Ano, Mie 514 2392, Japan
    Life Sci 73:3427-37. 2003
    ..1 cells. Our results indicate that [6]-gingerol is a potent inhibitor of NO synthesis and also an effective protector against peroxynitrite-mediated damage...
  6. ncbi request reprint Mechanism of inhibition of peroxynitrite-induced oxidation and nitration by [6]-gingerol
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agriculture and Bio Oriented Research Organization, Mie, Japan
    Planta Med 71:563-6. 2005
    ..We propose a mechanism in which [6]-gingerol scavenges peroxynitrite-derived radicals and consequently inhibits peroxynitrite-induced oxidation and nitration reactions...
  7. ncbi request reprint Primary structure analysis and functional expression of erythrose reductases from erythritol-producing fungi (Trichosporonoides megachiliensis SNG-42)
    Tetsuya Ookura
    National Food Research Institute, Ibaraki
    Biosci Biotechnol Biochem 69:944-51. 2005
    ..All three recombinant enzymes showed substrate specificity towards C-4 and C-3 aldehydes similar to that of the native ER-III. These results strongly suggest that cloned er1, er2, and er3 cDNAs encode erythrose reductases...
  8. pmc Lowering effects of onion intake on oxidative stress biomarkers in streptozotocin-induced diabetic rats
    Keiko Azuma
    National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization, 360, Kusawa, Ano cho, Tsu, Mie 514 2392, Japan
    J Clin Biochem Nutr 40:131-40. 2007
    ..These results strongly suggest that onion intake suppresses diabetes-induced oxidative stress more effectively than the intake of the same amount of quercetin aglycone alone...
  9. ncbi request reprint Effect of naturally occurring organosulfur compounds on nitric oxide production in lipopolysaccharide-activated macrophages
    Katsunari Ippoushi
    National Institute of Vegetable and Tea Science, National Agricultural Research Organization, 514 2392 Ano, Mie, Japan
    Life Sci 71:411-9. 2002
    ..Our results demonstrate that certain organosulfur compounds inhibit NO synthesis in LPS-activated macrophages, and the inhibitory effect may be a significant component of their anticarcinogenic activity...