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Here, a lanthanum nickel-layered double hydroxide and silver nanoparticle heterostructure (LaNi-LDH\/AgNPs) was fabricated by hydrothermal synthesis and sonochemical Ag deposition. Cyclic voltammetry and electrochemical impedance spectroscopy identified LaNi-LDH\/AgNPs\/GCE at 1:1 as optimal, giving a redox current of 61.61 \u03bcA, charge-transfer resistance of 481 \u03a9, and electroactive surface area of 0.0745 cm2. The composite showed a Tafel slope of 87 mV dec\u20131 for IC detection. Differential pulse voltammetry afforded a linear range of 0.01\u20131580 \u03bcM, sensitivity of 10.14 \u03bcA \u03bcM\u20131 cm\u20132, and detection limit of 0.00437 \u03bcM. The sensor showed reproducibility and repeatability with RSD values of 2.07% and 1.36%, retained 89.16% response after 3 weeks, and achieved 96.71\u201399.66% recoveries in real food samples using a portable potentiostat, consistent with high-performance liquid chromatography recoveries of 98.10\u2013100.02%.<\/jats:p>","DOI":"10.1021\/acs.jafc.6c02274","type":"journal-article","created":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T15:35:10Z","timestamp":1784648110000},"page":"23900-23913","source":"Crossref","is-referenced-by-count":1,"title":["Smartphone-Coupled\nPortable Electrocatalytic Interface\ntoward Quantification of Indigo Carmine in Food Matrices via AgNP-Decorated\nLamellar LaNi-LDH-Modified GCE"],"prefix":"10.1021","volume":"74","author":[{"given":"Harikrishnan","family":"Sathya","sequence":"first","affiliation":[{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]},{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arthi","family":"Shanmugam Kavitha","sequence":"additional","affiliation":[{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243301"]},{"name":"Korea University , , 145 Anam-ro, Seongbuk District , ,","place":["Seoul, South Korea, 02841"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6701-6507","authenticated-orcid":true,"given":"Mani","family":"Govindasamy","sequence":"additional","affiliation":[{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]},{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4948-4400","authenticated-orcid":true,"given":"Pin-Yi","family":"Chen","sequence":"additional","affiliation":[{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]},{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243303"]},{"name":"Ming Chi University of Technology , , ,","place":["New Taipei City, Taiwan, 243301"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gaber E.","family":"Eldesoky","sequence":"additional","affiliation":[{"name":"King Saud University , , P.O. 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