_Article_  
A Textile-Based Microfluidic Platform for the Detection of Cytostatic Drug Concentration in  
Sweat Samples  
[PERSON],*(), [PERSON], [PERSON], [PERSON], [PERSON], [PERSON] and [PERSON]()  
Faculty of Technical Sciences, University of Novi Sad, [PERSON] 6, 21000 Novi Sad, Serbia; [EMAIL_ADDRESS] (M.R.R. ); [EMAIL_ADDRESS] (Z.V.P) Faculty of Technology and Metallurgy, University of Belgrade, Karnegjieva 4, 11120 Belgrade, Serbia; [EMAIL_ADDRESS] (\"Vinca\") Institute of Nuclear Sciences, University of Belgrade, National Institute of the Republic of Serbia, P.O. Box 522, 11001 Belgrade, Serbia; [EMAIL_ADDRESS] (Z.V.S. ); [EMAIL_ADDRESS] (M.B.R.) Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia; [EMAIL_ADDRESS] (\"Correspondence: [EMAIL_ADDRESS]; Tel. : +381-21-4852-553 (\"Vinca\"  
Among the wide range of textile fibers, cotton (CO) fibers are natural, sustainable, and widely applied in different spheres of everyday life, from clothes to technical textiles [1]. A highly conductive composite comprising polystyrene sulfonate/multiwalled carbon nanotubes/CO fibers with deposited polyaniline (PANI) was used for real-time monitoring of the pH value of the skin [2]. Generally, PANI is a particularly attractive polymer as it can be easily synthesized by chemical oxidative polymerization of a relatively cheap monomer with high yield. The modification of CO fabrics with PANI aiming to provide electrically conductive clothing material with better durability was studied in [3] or to tune the electrical properties of textile materials by grafting PANI nanofibers in [4]. The electrical characteristics of CO fabrics coated with PANI and polypyrrole were also examined in [5], where resistance values of 350 and 512 \(\Omega\), respectively, were obtained. In situ polymerization of aniline on textile materials was utilized for the fabrication of conductive composite fabrics PANI/AgNO\({}_{3}\)/CO and PANI/CO which ensured specific electrical resistivity of \(15\times 10^{5}\)\(\Omega\)/cm and \(15\times 10^{3}\)\(\Omega\)/cm, respectively [6]. Furthermore, other textile fibers such as polyester (PET) [7; 8], polyamide [9], polyacryl [10], and wool [11] were also coated with PANI in order to obtain better electrical properties. The surface and bulk conductivity of CO, wool, and PET fabrics coated with PANI were also investigated in [12]. [PERSON] et al. studied the effect of different aniline polymerization conditions on the coating of PET fabric with conductive PANI and, consequently, on surface resistivity [13]. In the healthcare system, blood, urine, saliva, tears, and sweat are body fluids commonly used for the analysis of electrophysiological parameters. Among these samples, sweat is the most comfortable for subjects to be taken and the procedure is completely noninvasive. In addition, it can provide plenty of useful biochemical information in health diagnostics and sports performance. Colorimetric analysis of lactate, Na\({}^{+}\), and K\({}^{+}\) ion concentrations from sweat was reported in [14]. A skin-mounted device for monitoring the glucose level in sweat was presented in [15], and the device was fabricated via costly technological processes of lithography and screen-printing. Na\({}^{+}\) and K\({}^{+}\) ion concentrations in sweat were analyzed in [16] using ion-selective electrodes and also enabling the wireless transfer of measured data. The lactate level in sweat can be monitored using a biochemical analytical device developed in [17]. It was intended to be used for the monitoring of athletes' performance during physical activity. A polydimethylsiloxane (PDMS)-based thin and soft epidermal system for collecting sweat from the pores on the skin and for measuring total sweat loss and pH was reported in [18]. It was experimentally tested on humans in indoor and outdoor environments.