In situ synthesis of fluorescent silicon nanodots for determination of total carbohydrates in a paper microfluidic device combined with laser prepared graphene heater Ortiz Gómez, Inmaculada Toral López, Víctor Romero Maldonado, Francisco Javier Orbe Payá, Ignacio De García Ríos, Antonio Rodríguez Santiago, Noel Capitán Vallvey, Luis Fermín Morales Santos, Diego Pedro Salinas Castillo, Alfonso Silicon nanodots Total carbohydrates Color measurement μPAD Smartphone Laser induced graphene heater Laser-scribing We report a simple, rapid, low-resource and one-step method for formation of fluorescent silicon nanodots (SNDs) in a microfluidic paper-based analytical device (μPAD) incorporated in a reusable, portable and flexible heater for determination of total carbohydrates. The synthesis of SNDs is based on the redox reaction between (3-aminopropyl) triethoxysilane (APTS) reagent and carbohydrates, which act as a reducer. The graphene-based heater was fabricated by laser ablation of Kapton polyimide. Thereby, the developed system heat the μPAD during the synthesis of SNDs at 80 °C for 30 min. The blue emitting SNDs formed have an emission peak wavelength at 475 nm. We used a digital camera and smartphone for the quantitative analysis of total carbohydrates expressed such as index of glucose or fructose with grey scale value as the analytical parameter. Under the optimal conditions, the method has a low detection limit (0.80 μM for glucose and 0.51 μM for fructose, respectively), and a linear response (10–200 μM for glucose and 10–100 μM for fructose). The method has been applied to the determination of glucose in biological fluids (serum and urine samples). In addition, determination of total carbohydrates in commercial juices and teas have been carried out 2023-11-24T11:00:53Z 2023-11-24T11:00:53Z 2021-01-29 info:eu-repo/semantics/article Inmaculada Ortiz-Gómez, Víctor Toral-López, Francisco J. Romero, Ignacio de Orbe-Payá, Antonio García, Noel Rodríguez, Luís Fermín Capitán-Vallvey, Diego P Morales, Alfonso Salinas-Castillo, "In situ synthesis of fluorescent silicon nanodots for determination of total carbohydrates in a paper microfluidic device combined with laser prepared graphene heater", Sensors and Actuators B: Chemical, Volume 332, 2021, 129506 https://hdl.handle.net/10481/85837 10.1016/j.snb.2021.129506 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier