Resumen: Biomonitoring is a research topic that has largely relied on cell culture systems. Recently, the development of “Organ-on-a-Chip” (OC) platforms and the need for a continuous monitoring of these systems has increased its interest. However, the biomonitorization in these systems is still at its infancy due to the difficulty to adapt the sensors to microfluidic OC systems. In this work we have fabricated a modular, versatile, scalable, multi-analyte sensing platform, which integrates dissolved oxygen (DO), Na+, K+ and pH sensors for monitoring their concentrations in small volume of biological fluids. The platform is fabricated by means of rapid prototyping techniques using polymeric substrates, and incorporates all the necessary elements to measure the four analytes. It was designed with four gold sensing electrodes, and integrates a gold counter electrode and an Ag/AgCl pseudo-reference electrode for the electrochemical measurements in small volumes (0.83 µL) of samples. The sensors featured good sensitivities of 3.60 ± 0.2 nA (mg L-1) for DO and 69 ± 1 mV decade-1 for pH. Na+ and K+ µISE exhibited sensitivities of 57 ± 1 mV decade-1 and 52 ± 2 mV decade-1, and low limits of detection 5 × 10-6 M and 0.5 × 10-5 M respectively. This platform allows the dynamic measurement of the biological fluids parameters simultaneously, in real time and with a rapid response. The versatility of the platform allows its adaptation in any microfluidic cells culture systems. The novel multi-sensor platform has been validated in controlled buffers and with artificial urine (AU). A proof-of-concept using real mice urine (RU) has been carried out, demonstrating the good behaviour of the multi-sensing platform. Idioma: Inglés DOI: 10.1016/j.snb.2017.09.104 Año: 2018 Publicado en: SENSORS AND ACTUATORS B-CHEMICAL 255, 3 (2018), 2861-2870 ISSN: 0925-4005 Factor impacto JCR: 6.393 (2018) Categ. JCR: CHEMISTRY, ANALYTICAL rank: 6 / 84 = 0.071 (2018) - Q1 - T1 Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 2 / 61 = 0.033 (2018) - Q1 - T1 Categ. JCR: ELECTROCHEMISTRY rank: 4 / 26 = 0.154 (2018) - Q1 - T1 Factor impacto SCIMAGO: 1.389 - Condensed Matter Physics (Q1) - Electrical and Electronic Engineering (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Surfaces, Coatings and Films (Q1) - Materials Chemistry (Q1) - Metals and Alloys (Q1) - Instrumentation (Q1)