Rhod-2 (sodium salt)

Rhod-2 (sodium salt) is a water-soluble, red fluorescent calcium indicator. It exhibits a significant shift in fluorescence intensity upon calcium binding (ex max = 549 nm; calcium-free v. ex/em max = 552/581 nm; calcium-bound). Unlike the UV-excitable indicators fura-2 (Item Nos. 19531 | 20414) and indo-1 (Item Nos. 20419 | 20418), there is no accompanying spectral shift.

[1] R. MADELAINE PAREDES . Chemical calcium indicators[J]. Methods, 2008, 46 3: Pages 143-151. DOI: 10.1016/j.ymeth.2008.09.025
[2] A. MINTA R T J Kao. Fluorescent indicators for cytosolic calcium based on rhodamine and fluorescein chromophores.[J]. The Journal of Biological Chemistry, 1989, 13 1: 8171-8178. DOI: 10.1016/s0021-9258(18)83165-9