Skip to main content
. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: Arthritis Rheumatol. 2016 Jul;68(7):1751–1757. doi: 10.1002/art.39638

Figure 2.

Figure 2

Raman peaks associated with monosodium urate monohydrate (MSU; 631 cm−1) and calcium pyrophosphate dihydrate (CPPD; 1,050 cm−1) crystals. Raman peaks associated with MSU and CPPD crystals are presented in the spectra of samples from patients with confirmed gout and pseudogout, respectively. No crystal-associated peak was observed in the spectra of crystal-free synovial fluid samples. Spectra for synthetic pure MSU and CPPD crystals are included as references. Fluorescence background and filter membrane–associated peaks were removed from these spectra.