{"id":"https://openalex.org/W2020709408","doi":"https://doi.org/10.1016/j.jpba.2008.01.016","title":"Isolation and identification of thiohomosildenafil and thiosildenafil in health supplements","display_name":"Isolation and identification of thiohomosildenafil and thiosildenafil in health supplements","publication_year":2008,"publication_date":"2008-01-20","ids":{"openalex":"https://openalex.org/W2020709408","doi":"https://doi.org/10.1016/j.jpba.2008.01.016","mag":"2020709408","pmid":"https://pubmed.ncbi.nlm.nih.gov/18316170"},"language":"en","primary_location":{"id":"doi:10.1016/j.jpba.2008.01.016","doi":"https://doi.org/10.1016/j.jpba.2008.01.016","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.jpba.2008.01.016","pdf_url":null,"source":{"id":"https://openalex.org/S174893293","display_name":"Journal of Pharmaceutical and Biomedical Analysis","issn_l":"0731-7085","issn":["0731-7085","1873-264X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","doyens","jufo-1","ki-jl-1","medline","norway-1","poland-100","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Pharmaceutical and Biomedical Analysis","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/A5082668112","display_name":"Peng Zou","orcid":"https://orcid.org/0000-0002-7940-5056","observed_orcids":["https://orcid.org/0000-0002-7940-5056"]},"institutions":[{"id":"https://openalex.org/I165932596","display_name":"National University of Singapore","ror":"https://ror.org/01tgyzw49","country_code":"SG","type":"education","lineage":["https://openalex.org/I165932596"]},{"id":"https://openalex.org/I2799333108","display_name":"Health Sciences Authority","ror":"https://ror.org/02ybkn114","country_code":"SG","type":"government","lineage":["https://openalex.org/I1291357265","https://openalex.org/I2799333108"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Peng Zou","raw_affiliation_strings":["Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore","Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore","Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Pharmacy, Faculty of Science, National University of Singapore, Singapore","institution_ids":["https://openalex.org/I165932596"]},{"raw_affiliation_string":"Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore","institution_ids":["https://openalex.org/I2799333108"]},{"raw_affiliation_string":"Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore","institution_ids":["https://openalex.org/I165932596"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5056044042","display_name":"Peiling Hou","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I165932596","display_name":"National University of Singapore","ror":"https://ror.org/01tgyzw49","country_code":"SG","type":"education","lineage":["https://openalex.org/I165932596"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Peiling Hou","raw_affiliation_strings":["Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore","institution_ids":["https://openalex.org/I165932596"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5083489427","display_name":"Sharon Sze\u2010Yin Oh","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I2799333108","display_name":"Health Sciences Authority","ror":"https://ror.org/02ybkn114","country_code":"SG","type":"government","lineage":["https://openalex.org/I1291357265","https://openalex.org/I2799333108"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Sharon Sze-Yin Oh","raw_affiliation_strings":["Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore","institution_ids":["https://openalex.org/I2799333108"]}]},{"author_position":"middle","author":{"id":null,"display_name":"Y.M. Chong","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I165932596","display_name":"National University of Singapore","ror":"https://ror.org/01tgyzw49","country_code":"SG","type":"education","lineage":["https://openalex.org/I165932596"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Y.M. Chong","raw_affiliation_strings":["Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore","institution_ids":["https://openalex.org/I165932596"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5030884977","display_name":"Bosco Chen Bloodworth","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I2799333108","display_name":"Health Sciences Authority","ror":"https://ror.org/02ybkn114","country_code":"SG","type":"government","lineage":["https://openalex.org/I1291357265","https://openalex.org/I2799333108"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Bosco Chen Bloodworth","raw_affiliation_strings":["Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore","institution_ids":["https://openalex.org/I2799333108"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5035564207","display_name":"Min\u2010Yong Low","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I2799333108","display_name":"Health Sciences Authority","ror":"https://ror.org/02ybkn114","country_code":"SG","type":"government","lineage":["https://openalex.org/I1291357265","https://openalex.org/I2799333108"]}],"countries":["SG"],"is_corresponding":false,"raw_author_name":"Min-Yong Low","raw_affiliation_strings":["Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Centre for Analytical Science, Health Sciences Authority, 11 Outram Road, Singapore 169078, Singapore","institution_ids":["https://openalex.org/I2799333108"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5056639146","display_name":"Hwee\u2010Ling Koh","orcid":"https://orcid.org/0000-0003-1461-9245","observed_orcids":["https://orcid.org/0000-0003-1461-9245"]},"institutions":[{"id":"https://openalex.org/I165932596","display_name":"National University of Singapore","ror":"https://ror.org/01tgyzw49","country_code":"SG","type":"education","lineage":["https://openalex.org/I165932596"]}],"countries":["SG"],"is_corresponding":true,"raw_author_name":"Hwee-Ling Koh","raw_affiliation_strings":["Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Department of Pharmacy, Faculty of Science, National University of Singapore, Science Drive 4, Singapore 117543, Singapore","institution_ids":["https://openalex.org/I165932596"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":["https://openalex.org/A5056639146"],"corresponding_institution_ids":["https://openalex.org/I165932596"],"apc_list":{"value":3680,"currency":"USD","value_usd":3680},"apc_paid":null,"fwci":9.2135,"has_fulltext":false,"cited_by_count":73,"citation_normalized_percentile":{"value":0.98054985,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":87,"max":99},"biblio":{"volume":"47","issue":"2","first_page":"279","last_page":"284"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12878","display_name":"Pharmaceutical Quality and Counterfeiting","score":0.986299991607666,"subfield":{"id":"https://openalex.org/subfields/2739","display_name":"Public Health, Environmental and Occupational Health"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T12878","display_name":"Pharmaceutical Quality and Counterfeiting","score":0.986299991607666,"subfield":{"id":"https://openalex.org/subfields/2739","display_name":"Public Health, Environmental and Occupational Health"},"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/T11460","display_name":"Analytical Methods in Pharmaceuticals","score":0.009700000286102295,"subfield":{"id":"https://openalex.org/subfields/1602","display_name":"Analytical Chemistry"},"field":{"id":"https://openalex.org/fields/16","display_name":"Chemistry"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10800","display_name":"Forensic Toxicology and Drug Analysis","score":0.003700000001117587,"subfield":{"id":"https://openalex.org/subfields/3005","display_name":"Toxicology"},"field":{"id":"https://openalex.org/fields/30","display_name":"Pharmacology, Toxicology and Pharmaceutics"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/sildenafil-analogues","display_name":"sildenafil analogues","score":0.9909999966621399},{"id":"https://openalex.org/keywords/dietary-supplements","display_name":"dietary supplements","score":0.6650000214576721},{"id":"https://openalex.org/keywords/pyrazolopyrimidines","display_name":"pyrazolopyrimidines","score":0.8730000257492065},{"id":"https://openalex.org/keywords/sulfur-substitution","display_name":"sulfur substitution","score":0.8379999995231628},{"id":"https://openalex.org/keywords/structure-elucidation","display_name":"structure elucidation","score":0.7900000214576721},{"id":"https://openalex.org/keywords/natural-product-isolation","display_name":"natural product isolation","score":0.6520000100135803}],"concepts":[{"id":"https://openalex.org/C185592680","wikidata":"https://www.wikidata.org/wiki/Q2329","display_name":"Chemistry","level":0,"score":0.9282132387161255},{"id":"https://openalex.org/C2776568683","wikidata":"https://www.wikidata.org/wiki/Q23005640","display_name":"Moiety","level":2,"score":0.8618287444114685},{"id":"https://openalex.org/C518881349","wikidata":"https://www.wikidata.org/wiki/Q682","display_name":"Sulfur","level":2,"score":0.5994191765785217},{"id":"https://openalex.org/C71240020","wikidata":"https://www.wikidata.org/wiki/Q186011","display_name":"Stereochemistry","level":1,"score":0.5564680695533752},{"id":"https://openalex.org/C2776768464","wikidata":"https://www.wikidata.org/wiki/Q191521","display_name":"Sildenafil","level":2,"score":0.5553174614906311},{"id":"https://openalex.org/C2993420144","wikidata":"https://www.wikidata.org/wiki/Q627","display_name":"Nitrogen atom","level":3,"score":0.45120513439178467},{"id":"https://openalex.org/C2781311116","wikidata":"https://www.wikidata.org/wiki/Q83306","display_name":"Group (periodic table)","level":2,"score":0.23215696215629578},{"id":"https://openalex.org/C178790620","wikidata":"https://www.wikidata.org/wiki/Q11351","display_name":"Organic chemistry","level":1,"score":0.22813016176223755},{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.0},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.0}],"mesh":[{"descriptor_ui":"D000068677","descriptor_name":"Sildenafil Citrate","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D005506","descriptor_name":"Food Contamination","qualifier_ui":null,"qualifier_name":null,"is_major_topic":true},{"descriptor_ui":"D006801","descriptor_name":"Humans","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D008297","descriptor_name":"Male","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":"D010726","descriptor_name":"Phosphodiesterase Inhibitors","qualifier_ui":"Q000032","qualifier_name":"analysis","is_major_topic":true},{"descriptor_ui":"D010726","descriptor_name":"Phosphodiesterase Inhibitors","qualifier_ui":"Q000302","qualifier_name":"isolation & purification","is_major_topic":true},{"descriptor_ui":"D010726","descriptor_name":"Phosphodiesterase Inhibitors","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":false},{"descriptor_ui":"D010879","descriptor_name":"Piperazines","qualifier_ui":"Q000032","qualifier_name":"analysis","is_major_topic":true},{"descriptor_ui":"D010879","descriptor_name":"Piperazines","qualifier_ui":"Q000302","qualifier_name":"isolation & purification","is_major_topic":true},{"descriptor_ui":"D010879","descriptor_name":"Piperazines","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":false},{"descriptor_ui":"D011687","descriptor_name":"Purines","qualifier_ui":"Q000032","qualifier_name":"analysis","is_major_topic":false},{"descriptor_ui":"D011687","descriptor_name":"Purines","qualifier_ui":"Q000302","qualifier_name":"isolation & purification","is_major_topic":false},{"descriptor_ui":"D011687","descriptor_name":"Purines","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":false},{"descriptor_ui":"D013055","descriptor_name":"Spectrophotometry, Infrared","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D013056","descriptor_name":"Spectrophotometry, Ultraviolet","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D013058","descriptor_name":"Mass Spectrometry","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D013450","descriptor_name":"Sulfones","qualifier_ui":"Q000032","qualifier_name":"analysis","is_major_topic":true},{"descriptor_ui":"D013450","descriptor_name":"Sulfones","qualifier_ui":"Q000302","qualifier_name":"isolation & purification","is_major_topic":true},{"descriptor_ui":"D013450","descriptor_name":"Sulfones","qualifier_ui":"Q000737","qualifier_name":"chemistry","is_major_topic":false},{"descriptor_ui":"D015394","descriptor_name":"Molecular Structure","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D019587","descriptor_name":"Dietary Supplements","qualifier_ui":"Q000032","qualifier_name":"analysis","is_major_topic":true},{"descriptor_ui":"D021241","descriptor_name":"Spectrometry, Mass, Electrospray Ionization","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false},{"descriptor_ui":"D053719","descriptor_name":"Tandem Mass Spectrometry","qualifier_ui":null,"qualifier_name":null,"is_major_topic":false}],"locations_count":3,"locations":[{"id":"doi:10.1016/j.jpba.2008.01.016","doi":"https://doi.org/10.1016/j.jpba.2008.01.016","is_oa":false,"landing_page_url":"https://doi.org/10.1016/j.jpba.2008.01.016","pdf_url":null,"source":{"id":"https://openalex.org/S174893293","display_name":"Journal of Pharmaceutical and Biomedical Analysis","issn_l":"0731-7085","issn":["0731-7085","1873-264X"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-b","doyens","jufo-1","ki-jl-1","medline","norway-1","poland-100","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310320990","host_organization_name":"Elsevier BV","host_organization_lineage":["https://openalex.org/P4310320990"],"host_organization_lineage_names":["Elsevier BV"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Pharmaceutical and Biomedical Analysis","raw_type":"journal-article"},{"id":"pmid:18316170","doi":null,"is_oa":false,"landing_page_url":"https://pubmed.ncbi.nlm.nih.gov/18316170","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 pharmaceutical and biomedical analysis","raw_type":"Journal Article"},{"id":"pmh:oai:scholarbank.nus.edu.sg:10635/106097","doi":null,"is_oa":false,"landing_page_url":"http://scholarbank.nus.edu.sg/handle/10635/106097","pdf_url":null,"source":{"id":"https://openalex.org/S7407052290","display_name":"National University of Singapore","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"Scopus","raw_type":"Article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Good health and well-being","score":0.6240000128746033,"id":"https://metadata.un.org/sdg/3"}],"study_designs":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320307758","display_name":"Eli Lilly and Company","ror":"https://ror.org/01qat3289"},{"id":"https://openalex.org/F4320307765","display_name":"Pfizer","ror":"https://ror.org/01xdqrp08"}],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":21,"referenced_works":["https://openalex.org/W1965599334","https://openalex.org/W1967371398","https://openalex.org/W1969237789","https://openalex.org/W1986903923","https://openalex.org/W1989334460","https://openalex.org/W1993986115","https://openalex.org/W1994011397","https://openalex.org/W1998405211","https://openalex.org/W2032214083","https://openalex.org/W2039302750","https://openalex.org/W2041324624","https://openalex.org/W2069475137","https://openalex.org/W2083418834","https://openalex.org/W2089314421","https://openalex.org/W2097851162","https://openalex.org/W2116081345","https://openalex.org/W2127208110","https://openalex.org/W2128417790","https://openalex.org/W2143260569","https://openalex.org/W2157648069","https://openalex.org/W2163641820"],"related_works":["https://openalex.org/W2031744062","https://openalex.org/W2273231093","https://openalex.org/W2032397782","https://openalex.org/W2016860704","https://openalex.org/W2081810083","https://openalex.org/W2049166970","https://openalex.org/W1971562453","https://openalex.org/W2127840818","https://openalex.org/W2047937473","https://openalex.org/W348954570"],"abstract_inverted_index":null,"counts_by_year":[{"year":2023,"cited_by_count":1},{"year":2021,"cited_by_count":1},{"year":2020,"cited_by_count":1},{"year":2018,"cited_by_count":2},{"year":2017,"cited_by_count":2},{"year":2016,"cited_by_count":6},{"year":2015,"cited_by_count":5},{"year":2014,"cited_by_count":6},{"year":2013,"cited_by_count":10},{"year":2012,"cited_by_count":12}],"updated_date":"2026-10-31T12:09:11.096373","created_date":"2016-06-24T00:00:00"}
