3-D cell culture 1 3D cell culture 1 Agarose gel Cell culture 1 Cell death 1 Cell-be 1 Cell/B.E 1 Cell/BE 1 Electron transitions 1 Electron transport 1 Electron transport properties 1 Enzyme-catalyzed reactions 1 Enzymes 1 Free radicals 1 Hydrogels 1 Hydrogen peroxide 1 Living cell 1 Localized surface plasmon resonance 1 Microfluidics 1 Molecular oxygen 1 Oxidation 1 Reactive oxygen species 1 Substrates 1 Surface plasmon resonance 1 agarose gel 1 enzyme-catalyzed reaction 1 hydrogen peroxide 1 localized surface plasmon resonance 1 microfluidics 1