Origin of the MRI Contrast in Natural and Hydrogel Formulation of Pineapple Juice

Figure 1

Experimental ¹H R₁ profiles (circles) and ¹H R₂ at 400 MHz (stars) of pineapple juice at 25°C (solid symbols) and 37°C (empty symbols). The dotted and dashed lines represent estimates of the diamagnetic contribution and of the latter summed to the R₁ contribution from iron ions at 37°C, respectively; the dotted-dashed red line provides an estimate of the contributions to R₂ from diamagnetic relaxation and from transverse relaxation of iron ions at 37°C.