{"created":"2023-05-15T14:52:23.505658+00:00","id":71532,"links":{},"metadata":{"_buckets":{"deposit":"b0b84433-f9f8-4a42-a9e0-9e1c6b464f96"},"_deposit":{"created_by":1,"id":"71532","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"71532"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00071532","sets":["10:28"]},"author_link":["703436","703426","703437","703429","703432","703433","703428","703438","703430","703435","703431","703427","703434"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2014-11-15","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Flavonoids are known to show an efficient scavenging activity against 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical as a model of reactive oxygen species.  However, little is known about the DPPH radical-scavenging mechanisms of flavonoids.  On the other hand, Lewis acids, such as Mg(2+) and Al(3+), are known to accelerate electron-transfer reactions.  In this study, we investigated the effect of Lewis acids on the radical-scavenging activity of flavonoids, as well as on their one-electron oxidation potentials (E(0)(ox)) to clarify the detailed radical-scavenging mechanisms.\nThe rate of the DPPH radical-scavenging reaction of kaempferol, one of flavonoids, in the presence or absence of 0.1 M Mg(ClO(4))(2) or Al(ClO(4))(3) were determined by monitoring the absorbance change at 517 nm due to DPPH radical.  The second-order rate constant (k) for the DPPH radical-scavenging reaction by kaempferol was decreased in the presence of the Lewis acid.  The E(0)(ox) value of kaempferol was determined by second-harmonic alternating current voltammeter.  Mg(2+) showed little effect on the E(0)(ox) value of kaempferol, while the E(0)(ox) value was largely shifted in the presence of Al(3+) to the positive direction.  On the other hand, Al(3+) significantly changed the cyclic voltammogram of DPPH radical, while a slight change was observed in the presence of Mg(2+).  These results indicate that the one-electron accepting ability of DPPH radical was significantly increased in the presence of Al(3+).  These results indicate that the DPPH radical-scavenging reaction of kaempferol occurred via a hydrogen-atom transfer as the rate-determining step rather than electron transfer.","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"第47回酸化反応討論会","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"和氣, 司"}],"nameIdentifiers":[{"nameIdentifier":"703426","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"大久保, 敬"}],"nameIdentifiers":[{"nameIdentifier":"703427","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"松本, 謙一郎"}],"nameIdentifiers":[{"nameIdentifier":"703428","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小澤, 俊彦"}],"nameIdentifiers":[{"nameIdentifier":"703429","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"福住, 俊一"}],"nameIdentifiers":[{"nameIdentifier":"703430","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鎌田, 正"}],"nameIdentifiers":[{"nameIdentifier":"703431","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"中西, 郁夫"}],"nameIdentifiers":[{"nameIdentifier":"703432","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"和氣 司","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703433","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"大久保 敬","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703434","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"松本 謙一郎","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703435","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"小澤 俊彦","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703436","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"鎌田 正","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703437","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"中西 郁夫","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"703438","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"ルイス酸存在下におけるフラボノイド類の酸化反応挙動","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"ルイス酸存在下におけるフラボノイド類の酸化反応挙動"}]},"item_type_id":"10005","owner":"1","path":["28"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-11-06"},"publish_date":"2014-11-06","publish_status":"0","recid":"71532","relation_version_is_last":true,"title":["ルイス酸存在下におけるフラボノイド類の酸化反応挙動"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T19:50:09.162658+00:00"}