Rhod-3 Calcium Imaging Kit - FAQs

This is a known drawback of Calcium Crimson, AM (as well as Calcium Orange, AM and Fura Red, AM, which are also in the same emission range). You can try increasing the concentration and washing out of any unlabeled dye from the media, to try to get better signal-to-background. If that fails, we recommend using Rhod-3 AM instead, which has a much better change in signal in that wavelength.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.

Regardless of the type of live-cell indicator dye (e.g., calcium indicators, pH indicator, metal ion indicators), make sure there is no serum during the loading step, which can prematurely cleave dyes with AM esters and bind dyes non-specifically. Always optimize the dye concentration and staining time with a positive control before you run your test samples, to give the best signal-to-background. Always run a positive control with a buffer containing free ions of known concentration and an ionophore to open pores to those ions (for instance, for calcium indicators like Fluo-4 AM, this would include a buffer with added calcium combined with calcimycin, or for pH indicators, buffers of different pHs combined with nigericin). Reactive oxygen indicators, such as CellROX Green or H2DCFDA would require a cellular reactive oxygen species (ROS) stimulant as a positive control, such as menadione. Finally, make sure your imaging system has a sensitive detector. Plate readers, for instance, have much lower detector efficiency over background, compared to microscopy or flow cytometry.

Find additional tips, troubleshooting help, and resources within our Cell Analysis Support Center.