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

Table 3

Relaxation rates (s⁻¹) at 37°C measured for pineapple juice and Mn²⁺ solutions without and with alginate.

	R1 at 0.94 T	R1 at 9.4 T	R2 at 9.4 T
Pineapple juice	3.7	2.4	33.9
Pineapple juice + 5% alginate	9.6	4.8	58.4
Pineapple juice + 15% alginate	15.2	5.6	73.7
Mn^2+ solution 0.43 mmol/dm^3, pH 3.6	2.5	2.2	52.1
Mn^2+ solution 0.43 mmol/dm^3 + 5% alginate	7.7	3.9	49.5
Mn^2+ solution 0.43 mmol/dm^3 + 15% alginate	12.6	4.8	68.0