 The RU-DPP3Cl2 compound is a fluorescent sensor used to measure the amount of oxygen present in a sample. When exposed to light, this compound emits a specific wavelength of light, which can be detected by a fluorometer. This fluorescence intensity is dependent upon the metabolism of the microorganisms present in the sample, allowing researchers to determine the metabolic activity of the organisms. Additionally, the compound can detect the presence of oxygen even when it is present in low concentrations, making it ideal for use in sterile environments. Furthermore, the compound has been found to be effective in detecting the presence of microbes in non-sterile pharmaceutical preparations, allowing for rapid identification of contaminants and enabling the implementation of corrective measures. This article was authored by Raffle Halesa, Qatar Jinnatureka, Magdalena Smoktinovics, and others.