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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Arch Pharm Res. 2013 Oct 8;37(12):1607–1616. doi: 10.1007/s12272-013-0257-5

Fig. 6.

Fig. 6

Structural stability of split vaccine. a Intrinsic fluorescence spectra of split vaccine particles: (i) shifts in maximum emission wavelength (Δλ = λ − λiso pH 7.0), (ii) relative intensity of emission maxima (I/Iiso, pH 7.0). The maximum emission position and intensity relative to control (pH 7.0) were analyzed from fluorescence spectra measured from split vaccine particles after 2 h of incubation at 4 °C. (Mean ± SD; n = 6.). b TEM micrograph of split vaccine particles incubated in acidic hyper-osmotic medium (Δ = 0.3 osM, pH 2.0) for 2 h. c HA activity of split vaccine particles. Hemagglutinating activity of split vaccine in acidic hyper-osmotic medium was measured after 2 h of incubation, and the functional HA activity relative to control (Δ = 0 osM, pH 7.0) is shown for comparison (Mean ± SD; n = 8)