We received a request through the website to perform an urgent investigation of a plant culture media to verify concentration of two carbohydrates and an antibiotic at a very low concentration. In addition, antibiotic did not have any UV absorbance, thus complicating its detection. Nevertheless, only two days later, a suitable LC-MS method was developed and successfully used to troubleshoot media preparation. Our client was able to uncover complex interactions between different media components and come up with a solution for a viable formulation.