{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T03:34:42Z","timestamp":1777433682508,"version":"3.51.4"},"reference-count":21,"publisher":"Wiley","license":[{"start":{"date-parts":[[2011,1,1]],"date-time":"2011-01-01T00:00:00Z","timestamp":1293840000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"funder":[{"DOI":"10.13039\/501100004515","name":"Universiti Kebangsaan Malaysia","doi-asserted-by":"publisher","award":["UKM-OUP-NBT-29-151\/2011"],"award-info":[{"award-number":["UKM-OUP-NBT-29-151\/2011"]}],"id":[{"id":"10.13039\/501100004515","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004515","name":"Universiti Kebangsaan Malaysia","doi-asserted-by":"publisher","award":["UKM-INDUSTRI-HEJIM-12-2010"],"award-info":[{"award-number":["UKM-INDUSTRI-HEJIM-12-2010"]}],"id":[{"id":"10.13039\/501100004515","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004515","name":"Universiti Kebangsaan Malaysia","doi-asserted-by":"publisher","award":["UKM-OUP-NBT-29-151\/2011"],"award-info":[{"award-number":["UKM-OUP-NBT-29-151\/2011"]}],"id":[{"id":"10.13039\/501100004515","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004515","name":"Universiti Kebangsaan Malaysia","doi-asserted-by":"publisher","award":["UKM-INDUSTRI-HEJIM-12-2010"],"award-info":[{"award-number":["UKM-INDUSTRI-HEJIM-12-2010"]}],"id":[{"id":"10.13039\/501100004515","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Sensors"],"published-print":{"date-parts":[[2011]]},"abstract":"<jats:p>A disposable copper (II) ion biosensor based on self-assembly of L-cysteine on gold nanoparticle-modified screen-printed carbon electrode was fabricated. The electrode was modified by attaching gold nanoparticles onto the surface of screen-printed carbon electrode through seed mediated growth method followed by self-assembly of L-cysteine. As demonstrated by differential pulse voltammetry, the sensor exhibited high sensitivity to copper (II) ion down to ppb (parts per billion) levels. Optimization of various experimental parameters such as pH, buffer concentration, and preconcentration time, which influenced the performance of the biosensor, was investigated. The sensor demonstrated a wide linear response range from 10 to 0.005\u2009ppm<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mrow><mml:mo stretchy=\"false\">(<\/mml:mo><mml:mi>r<\/mml:mi><mml:mo>=<\/mml:mo><mml:mn>0.9870<\/mml:mn><mml:mo stretchy=\"false\">)<\/mml:mo><\/mml:mrow><\/mml:math>, with a lower detection limit of 8\u2009ppb using 10\u2009min of preconcentration time. The sensor based on screen-printed electrode provides a cost-effective means of application of copper ion sensor for the detection of ppb level of copper ions in water.<\/jats:p>","DOI":"10.1155\/2011\/230535","type":"journal-article","created":{"date-parts":[[2011,12,21]],"date-time":"2011-12-21T16:00:30Z","timestamp":1324483230000},"page":"1-5","source":"Crossref","is-referenced-by-count":8,"title":["A Disposable Copper (II) Ion Biosensor Based on Self-Assembly of L-Cysteine on Gold Nanoparticle-Modified Screen-Printed Carbon Electrode"],"prefix":"10.1155","volume":"2011","author":[{"given":"Wong","family":"Pooi See","sequence":"first","affiliation":[{"name":"School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sheila","family":"Nathan","sequence":"additional","affiliation":[{"name":"School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lee","family":"Yook Heng","sequence":"additional","affiliation":[{"name":"School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, Malaysia"},{"name":"South East Asia Disaster Prevention Research Institute (SEADPRI), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aca.2010.07.041"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2003.12.055"},{"key":"3","doi-asserted-by":"publisher","DOI":"10.1016\/S0022-0728(01)00649-0"},{"key":"4","doi-asserted-by":"publisher","DOI":"10.1039\/b102898g"},{"key":"5","doi-asserted-by":"publisher","DOI":"10.1039\/b212881k"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2005.03.046"},{"issue":"19","key":"7","doi-asserted-by":"crossref","first-page":"1982","DOI":"10.1039\/b106730n","year":"2001","journal-title":"Chemical Communications"},{"key":"8","doi-asserted-by":"publisher","DOI":"10.1016\/j.elecom.2006.06.019"},{"key":"9","doi-asserted-by":"publisher","DOI":"10.1016\/j.snb.2006.10.062"},{"key":"10","doi-asserted-by":"publisher","DOI":"10.1016\/j.aca.2007.02.069"},{"key":"11","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2009.03.085"},{"key":"12","doi-asserted-by":"publisher","DOI":"10.1016\/j.talanta.2008.04.036"},{"key":"13","doi-asserted-by":"publisher","DOI":"10.1016\/j.elecom.2006.10.015"},{"key":"14","doi-asserted-by":"publisher","DOI":"10.1016\/j.apsusc.2006.04.033"},{"issue":"9","key":"15","doi-asserted-by":"crossref","first-page":"2016","DOI":"10.1021\/ac991215y","volume":"72","year":"2000","journal-title":"Analytical Chemistry"},{"key":"16","doi-asserted-by":"publisher","DOI":"10.1021\/la001283b"},{"key":"17","doi-asserted-by":"publisher","DOI":"10.1039\/b305867k"},{"key":"18","doi-asserted-by":"publisher","DOI":"10.1016\/j.elecom.2009.08.043"},{"key":"19","series-title":"Amino Acids","volume":"1","year":"1974"},{"key":"21","volume":"1","year":"2008"},{"key":"22","year":"1970"}],"container-title":["Journal of Sensors"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/downloads.hindawi.com\/journals\/js\/2011\/230535.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/js\/2011\/230535.xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"http:\/\/downloads.hindawi.com\/journals\/js\/2011\/230535.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2017,6,20]],"date-time":"2017-06-20T07:40:03Z","timestamp":1497944403000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.hindawi.com\/journals\/js\/2011\/230535\/"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011]]},"references-count":21,"alternative-id":["230535","230535"],"URL":"https:\/\/doi.org\/10.1155\/2011\/230535","relation":{},"ISSN":["1687-725X","1687-7268"],"issn-type":[{"value":"1687-725X","type":"print"},{"value":"1687-7268","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011]]}}}