Abstract
ABSTRACTTo obtain an effective iodine solution, the use of 2-hydroxypropyl-α-cyclodextrin (2-HP-α-CD) as solubilizer was examined in comparison with α-cyclodextrin (α-CD), β-cyclodextrin (β-CD), potassium iodide (KI), and polyvinylpyrrolidone (PVP). The stability constants for inclusion of iodine with cyclodextrin and KI were ascertained by the solubility method. The apparent stability constants increased in the following order: KI<β-CD<α-CD<2-HP-α-CD. This order was nearly in accordance with that of the stabilization ability. The largest volatile depression effect was exhibited by 2HP-α-CD. The measurement of the minimum inhibitory concentration (MC) using Escherichia coli NIH-J-2 and Staphylococcus aureus FDA209P suggested that the bactericidal activity of the iodine/2-HP-α-CD system was the same as that of the iodine/α-CD, iodine/β-CD, and iodine/PVP systems. The present results suggest that the combination of 2-HP-α-CD and iodine is useful for a stable and effective iodine solution.
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