Jhonys Machado Freitas

A portable electrochemical method for cocaine quantification and rapid screening of common adulterants in seized samples

Jhonys Machado Freitas, David Ramos, Raquel Sousa et al. · Sensors and Actuators B Chemical · 2016 · 126 citations · Full text

Pharmacy, Chemistry, Toxicology +14

Simultaneous determination of captopril and hydrochlorothiazide on boron-doped diamond electrode by batch injection analysis with multiple pulse amperometric detection

Denise Tofanello Gimenes, Mariana C. Marra, Jhonys Machado Freitas et al. · Sensors and Actuators B Chemical · 2015 · 59 citations

Pharmacy, Chemistry, Pharmaceutical Analysis +13

Simultaneous determination of three species with a single-injection step using batch injection analysis with multiple pulse amperometric detection

Jhonys Machado Freitas, Thiago da Costa Oliveira, Denise Tofanello Gimenes et al. · Talanta · 2015 · 52 citations

Natural Sciences, Pharmaceutical Analysis, Pharmacology +7

Flow‐Injection Amperometric Method for Determination of Diclofenac in Pharmaceutical Formulations Using a Boron‐Doped Diamond Electrode

Denise Tofanello Gimenes, Jhonys Machado Freitas, Rodrigo A.A. Muñoz et al. · Electroanalysis · 2011 · 46 citations

Pharmacy, Pharmaceutical Analysis, Pharmaceutics +10

A batch injection analysis system with square-wave voltammetric detection for fast and simultaneous determination of naphazoline and zinc

Thiago da Costa Oliveira, Jhonys Machado Freitas, Rodrigo A.A. Muñoz et al. · Talanta · 2016 · 46 citations

Natural Sciences, Chemical Engineering, Chemistry +17