“…SERS-based techniques provide high sensitivity with a short time of analysis. We aimed to minimize the time of analysis to 15 min in this work and our previous works ( Kukushkin et al, 2019 ; Gribanev et al, 2021 ; Gribanyov et al, 2021 ; Zavyalova et al, 2022 ; Zhdanov et al, 2022 ), which places the techniques in the raw of rapid point-of-care tests. SERS equipment is of rather high cost; here, we used a portable device with the price 15,000 USD with a user-friendly interface (RaPort instrument from Enhanced Spectrometry, United States).…”