A distance-based paper sensor for rapid detection of blood lactate concentration using gold nanoparticles synthesized by Satureja hortensis

Rapid detection of lactate as the major fuel source and material to support level blood sugar can open up a new class analysis for nutritionists sports medicine practitioners. Here, rapid user-friendly method monitoring changes in concentration is reported, involving use paper strip coated with gold nanoparticles (AuNPs). The aqueous extract Satureja hortensis used reduction agent green synthesis AuNPs. Due interaction between NPs flowing across strip, they change color from red purple, which be detected by naked eye. It possible create distance-based sensor, representing these column colored bars on substrate whose length has good linear relationship ranged 1.0 30.0 mM. By recording scanner, sensor response also obtained using an image method, leading calibration curve range 0.5–30.0 resulting limits measurements are found 0.6 0.47 distance measurement methods, respectively. Interestingly, presence interfering species, selective lactate, while showing performance measuring real samples.