Maltose-mediated long-term stabilization of freeze- and spray- dried forms of bovine and porcine hemoglobin

2019 
Slaughterhouse blood represents a valuable source of hemoglobin, which can be used in production of heme-iron based supplements for preven­tion/treatment of iron-deficiency anemia. In order to obtain stable solid-state formulation, we have investigated the effect of maltose addition (30 % (w/v)) on stability and storage of bovine and porcine hemoglobin in the powders obtained by spray- and freeze- drying (without maltose: Hb; with maltose: HbM). Differential scanning calorimetry of spray- and freeze-dried powders pointed toward satisfying quality of the formulation prepared with maltose on dissolving back into solution. After two-year storage at room temperature (20±5 oC) in solid forms, protected from moisture and light, rehydrated spray- and freeze-dried HbM were red, while Hb were brown. Dynamic light scattering showed presence of native hemoglobin monomers in rehydrated spray- and freeze- dried HbM, but their agglomerates in Hb samples. UV-VIS spectrometry confirmed an absence of a significant hemoglobin denaturation and methemoglobin formation in HbM freeze- dried powders. In spray-dried HbM, an increased level of methemoglobin was detected. The results confirmed stabilizing effect of maltose, and suggested its use in production of long-term stable solid-state formulations of hemoglobin, along with drying processes optimization.
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