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In this report, an amperometric detection method for blood glucose level was developed benefiting from glucose oxidase (GO) enzyme immobilization on nanoparticle modified graphite rod (GR) electrode. Fe 3 O 4-CS-Au magnetic nanoparticles were synthesized, characterized by TEM, UV-Vis, magnetometry, FTIR, and zeta potential measurements and used for the modification of GR electrode. This modified electrode was used for the detection of glucose level amperometrically at 0.6 V. The obtained calibration graph was linear in the range of 5–30 mM glucose concentration with a coefficient of determination (R 2) 0.9971. The limit of detection (LOD) and limit of quantification (LOQ) values were calculated as 0.55 and 1.83 mM, respectively. The modified GR electrode showed excellent selectivity in the presence of dopamine, ascorbic acid, and uric acid. The applicability of the developed method was examined in …