Urea-PAGE of transferrin incubating for varying times with 100 μg/ml iron gluconate (left) or iron sucrose (right). Urea-PAGE of transferrin incubating for varying times with 100 μg/ml iron gluconate (left) or iron sucrose (right). Control lane has apotransferrin alone showing a single band. After varying times of incubation (shown on top of each lane), a greater proportion of saturation is seen with iron gluconate compared with iron sucrose. Reprinted from reference (12). Kalkidan Bishu, and Rajiv Agarwal CJASN 2006;1:S19-S23 ©2006 by American Society of Nephrology