{"id":"https://openalex.org/W2068224943","doi":"https://doi.org/10.1021/jf011301a","title":"Synthesis of Theaflavin from Epicatechin and Epigallocatechin by Plant Homogenates and Role of Epicatechin Quinone in the Synthesis and Degradation of Theaflavin","display_name":"Synthesis of Theaflavin from Epicatechin and Epigallocatechin by Plant Homogenates and Role of Epicatechin Quinone in the Synthesis and Degradation of Theaflavin","publication_year":2002,"publication_date":"2002-02-26","ids":{"openalex":"https://openalex.org/W2068224943","doi":"https://doi.org/10.1021/jf011301a","mag":"2068224943","pmid":"https://pubmed.ncbi.nlm.nih.gov/11902970"},"language":"en","primary_location":{"id":"doi:10.1021/jf011301a","doi":"https://doi.org/10.1021/jf011301a","is_oa":false,"landing_page_url":"https://doi.org/10.1021/jf011301a","pdf_url":null,"source":{"id":"https://openalex.org/S134644764","display_name":"Journal of Agricultural and Food Chemistry","issn_l":"0021-8561","issn":["0021-8561","1520-5118"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-3","ki-jl-2","medline","norway-2","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320006","host_organization_name":"American Chemical Society","host_organization_lineage":["https://openalex.org/P4310320006"],"host_organization_lineage_names":["American Chemical Society"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Agricultural and Food Chemistry","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5090835480","display_name":"Takashi Tanaka","orcid":"https://orcid.org/0000-0001-7762-7432","observed_orcids":["https://orcid.org/0000-0001-7762-7432"]},"institutions":[{"id":"https://openalex.org/I43777268","display_name":"Nagasaki University","ror":"https://ror.org/058h74p94","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Takashi Tanaka","raw_affiliation_strings":["School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan","institution_ids":["https://openalex.org/I43777268"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5068855447","display_name":"Chie Mine","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I43777268","display_name":"Nagasaki University","ror":"https://ror.org/058h74p94","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Chie Mine","raw_affiliation_strings":["School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan","institution_ids":["https://openalex.org/I43777268"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5112624604","display_name":"Kyoko Inoue","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I43777268","display_name":"Nagasaki University","ror":"https://ror.org/058h74p94","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Kyoko Inoue","raw_affiliation_strings":["School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan","institution_ids":["https://openalex.org/I43777268"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5112626396","display_name":"Miyuki Matsuda","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I43777268","display_name":"Nagasaki University","ror":"https://ror.org/058h74p94","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]}],"countries":["JP"],"is_corresponding":false,"raw_author_name":"Miyuki Matsuda","raw_affiliation_strings":["School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan","institution_ids":["https://openalex.org/I43777268"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5111452429","display_name":"Isao Kouno","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I43777268","display_name":"Nagasaki University","ror":"https://ror.org/058h74p94","country_code":"JP","type":"education","lineage":["https://openalex.org/I43777268"]}],"countries":["JP"],"is_corresponding":true,"raw_author_name":"Isao Kouno","raw_affiliation_strings":["School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"School of Pharmaceutical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan","institution_ids":["https://openalex.org/I43777268"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":["https://openalex.org/A5111452429"],"corresponding_institution_ids":["https://openalex.org/I43777268"],"apc_list":{"value":4500,"currency":"USD","value_usd":4500},"apc_paid":null,"fwci":5.8737,"has_fulltext":false,"cited_by_count":168,"citation_normalized_percentile":{"value":0.95848589,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":93,"max":100},"biblio":{"volume":"50","issue":"7","first_page":"2142","last_page":"2148"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11411","display_name":"Tea Polyphenols and Effects","score":0.9657999873161316,"subfield":{"id":"https://openalex.org/subfields/1106","display_name":"Food Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},"topics":[{"id":"https://openalex.org/T11411","display_name":"Tea Polyphenols and Effects","score":0.9657999873161316,"subfield":{"id":"https://openalex.org/subfields/1106","display_name":"Food Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T10035","display_name":"Phytochemicals and Antioxidant Activities","score":0.020800000056624413,"subfield":{"id":"https://openalex.org/subfields/2704","display_name":"Biochemistry (medical)"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T11237","display_name":"Plant Gene Expression Analysis","score":0.006599999964237213,"subfield":{"id":"https://openalex.org/subfields/1312","display_name":"Molecular Biology"},"field":{"id":"https://openalex.org/fields/13","display_name":"Biochemistry, Genetics and Molecular Biology"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/epicatechin","display_name":"epicatechin","score":0.921999990940094},{"id":"https://openalex.org/keywords/epigallocatechin","display_name":"epigallocatechin","score":1.0},{"id":"https://openalex.org/keywords/catechin-oxidation","display_name":"catechin oxidation","score":0.6800000071525574},{"id":"https://openalex.org/keywords/glutathione-conjugates","display_name":"glutathione conjugates","score":0.8220000267028809},{"id":"https://openalex.org/keywords/electron-transfer","display_name":"electron transfer","score":0.5490000247955322}],"concepts":[{"id":"https://openalex.org/C2780487065","wikidata":"https://www.wikidata.org/wiki/Q415677","display_name":"Theaflavin","level":4,"score":0.957404613494873},{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.7007684707641602},{"id":"https://openalex.org/C2775874295","wikidata":"https://www.wikidata.org/wiki/Q568694","display_name":"PEAR","level":2,"score":0.6027728319168091},{"id":"https://openalex.org/C2780643102","wikidata":"https://www.wikidata.org/wiki/Q412382","display_name":"Quinone","level":2,"score":0.5826563835144043},{"id":"https://openalex.org/C31903555","wikidata":"https://www.wikidata.org/wiki/Q1637030","display_name":"Food science","level":1,"score":0.5387270450592041},{"id":"https://openalex.org/C83082669","wikidata":"https://www.wikidata.org/wiki/Q39338","display_name":"Orange (colour)","level":2,"score":0.48561516404151917},{"id":"https://openalex.org/C64584667","wikidata":"https://www.wikidata.org/wiki/Q161179","display_name":"Pigment","level":2,"score":0.45620983839035034},{"id":"https://openalex.org/C538909803","wikidata":"https://www.wikidata.org/wiki/Q116907","display_name":"Glutathione","level":3,"score":0.4292134940624237},{"id":"https://openalex.org/C2777787921","wikidata":"https://www.wikidata.org/wiki/Q5382492","display_name":"Epicatechin gallate","level":5,"score":0.41469237208366394},{"id":"https://openalex.org/C55493867","wikidata":"https://www.wikidata.org/wiki/Q7094","display_name":"Biochemistry","level":1,"score":0.3442882001399994},{"id":"https://openalex.org/C59822182","wikidata":"https://www.wikidata.org/wiki/Q441","display_name":"Botany","level":1,"score":0.2587936520576477},{"id":"https://openalex.org/C70899900","wikidata":"https://www.wikidata.org/wiki/Q290439","display_name":"Polyphenol","level":3,"score":0.235483318567276},{"id":"https://openalex.org/C2779431889","wikidata":"https://www.wikidata.org/wiki/Q415007","display_name":"Catechin","level":4,"score":0.19998961687088013},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.16725918650627136},{"id":"https://openalex.org/C2778004101","wikidata":"https://www.wikidata.org/wiki/Q133948","display_name":"Antioxidant","level":2,"score":0.16506117582321167},{"id":"https://openalex.org/C181199279","wikidata":"https://www.wikidata.org/wiki/Q8047","display_name":"Enzyme","level":2,"score":0.11931464076042175},{"id":"https://openalex.org/C178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","level":1,"score":0.0867568850517273}],"mesh":[{"descriptor_ui":"D002392","descriptor_name":"Catechin","qualifier_ui":"Q000031","qualifier_name":"analogs & derivatives","is_major_topic":true},{"descriptor_ui":"D002392","descriptor_name":"Catechin","qualifier_ui":"Q000378","qualifier_name":"metabolism","is_major_topic":true},{"descriptor_ui":"D007700","descriptor_name":"Kinetics","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D009682","descriptor_name":"Magnetic Resonance Spectroscopy","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D010084","descriptor_name":"Oxidation-Reduction","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D010944","descriptor_name":"Plants","qualifier_ui":"Q000378","qualifier_name":"metabolism","is_major_topic":true},{"descriptor_ui":"D013662","descriptor_name":"Tea","qualifier_ui":"Q000378","qualifier_name":"metabolism","is_major_topic":false},{"descriptor_ui":"D013662","descriptor_name":"Tea","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":false},{"descriptor_ui":"D028521","descriptor_name":"Musa","qualifier_ui":"Q000378","qualifier_name":"metabolism","is_major_topic":false},{"descriptor_ui":"D044946","descriptor_name":"Biflavonoids","qualifier_ui":null,"qualifier_name":null,"is_major_topic":true}],"locations_count":2,"locations":[{"id":"doi:10.1021/jf011301a","doi":"https://doi.org/10.1021/jf011301a","is_oa":false,"landing_page_url":"https://doi.org/10.1021/jf011301a","pdf_url":null,"source":{"id":"https://openalex.org/S134644764","display_name":"Journal of Agricultural and Food Chemistry","issn_l":"0021-8561","issn":["0021-8561","1520-5118"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","jufo-3","ki-jl-2","medline","norway-2","poland-140","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320006","host_organization_name":"American Chemical Society","host_organization_lineage":["https://openalex.org/P4310320006"],"host_organization_lineage_names":["American Chemical Society"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Agricultural and Food Chemistry","raw_type":"journal-article"},{"id":"pmid:11902970","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/11902970","pdf_url":null,"source":{"id":"https://openalex.org/S4306525036","display_name":"PubMed","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I1299303238","host_organization_name":"National Institutes of Health","host_organization_lineage":["https://openalex.org/I1299303238"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of agricultural and food chemistry","raw_type":"Journal Article"}],"best_oa_location":null,"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":18,"referenced_works":["https://openalex.org/W1515651062","https://openalex.org/W1556813820","https://openalex.org/W1981652978","https://openalex.org/W1986635247","https://openalex.org/W1986820204","https://openalex.org/W1996718807","https://openalex.org/W2002143263","https://openalex.org/W2015134514","https://openalex.org/W2026872930","https://openalex.org/W2031147772","https://openalex.org/W2044271087","https://openalex.org/W2051977252","https://openalex.org/W2052862045","https://openalex.org/W2065390041","https://openalex.org/W2093373886","https://openalex.org/W2094178208","https://openalex.org/W2133267549","https://openalex.org/W2485576625"],"related_works":["https://openalex.org/W1979705111","https://openalex.org/W205686492","https://openalex.org/W2133267549","https://openalex.org/W1996718807","https://openalex.org/W3203081556","https://openalex.org/W1972663660","https://openalex.org/W2065390041","https://openalex.org/W1982057002","https://openalex.org/W1997974980","https://openalex.org/W2917632608"],"abstract_inverted_index":{"Oxidation":[0],"products":[1],"of":[2,10,23,31,46,53,84],"(-)-epicatechin":[3],"and":[4,39,76,86,103],"(-)-epigallocatechin":[5],"by":[6,88],"treatment":[7,70],"with":[8,71],"homogenates":[9],"62":[11],"plants":[12,20,57],"belonging":[13],"to":[14,60,91],"49":[15],"families":[16],"were":[17,21],"compared.":[18],"Forty-six":[19],"capable":[22],"synthesizing":[24],"theaflavin,":[25],"a":[26,97],"black":[27],"tea":[28,48,73],"pigment,":[29],"regardless":[30],"whether":[32],"they":[33],"contained":[34],"catechins.":[35],"Loquat,":[36],"Japanese":[37,78],"pear,":[38],"blueberry":[40],"had":[41],"activities":[42],"higher":[43],"than":[44],"that":[45],"fresh":[47,72],"leaves":[49],"after":[50],"5":[51],"h":[52],"treatment;":[54],"furthermore,":[55],"these":[56],"oxidized":[58],"theaflavin":[59,87],"theanaphthoquinone.":[61],"An":[62],"additional":[63],"new":[64],"metabolite,":[65],"dehydrotheasinensin,":[66],"was":[67,94],"generated":[68],"on":[69],"leaves,":[74],"eggplant,":[75],"unripened":[77],"orange.":[79],"Evidence":[80],"for":[81],"the":[82,105],"oxidation":[83],"epigallocatechin":[85],"electron":[89],"transfer":[90],"epicatechin":[92],"quinone":[93,106],"demonstrated":[95],"in":[96],"time":[98],"course":[99],"study":[100],"using":[101],"bananas":[102],"trapping":[104],"intermediates":[107],"as":[108],"glutathione":[109],"conjugates.":[110]},"counts_by_year":[{"year":2026,"cited_by_count":4},{"year":2025,"cited_by_count":10},{"year":2024,"cited_by_count":15},{"year":2023,"cited_by_count":11},{"year":2022,"cited_by_count":7},{"year":2021,"cited_by_count":7},{"year":2020,"cited_by_count":7},{"year":2019,"cited_by_count":2},{"year":2018,"cited_by_count":8},{"year":2017,"cited_by_count":8},{"year":2016,"cited_by_count":14},{"year":2015,"cited_by_count":10},{"year":2014,"cited_by_count":7},{"year":2013,"cited_by_count":4},{"year":2012,"cited_by_count":4}],"updated_date":"2026-11-10T11:39:43.021295","created_date":"2016-06-24T00:00:00"}
