A desirable lanthanide-based ratiometric fluorescence probe was designed as a multifunctional nanoplatform for the determination of dipicolinic acid (DPA). a unique bacterial endospore biomarker. with high selectivity and sensitivity. The carbon dots (CDs) with blue emission wavelengths at 470 nm are developed with europium ion (Eu3+) to form Eu3+/CDs fluorescent probes. https://www.marketingjeunesse.com/product-category/foam-mask/