Summary
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1.
Metachromasia with toluidine blue could be induced by inositol hexaphosphate, the smallest chromotrope molecule so far reported.
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2.
The metachromatic compound, pink in color, and distinct from orthochromatic dye, could be separated by centrifugation. This complex could as well be decomposed by dil. HCl.
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3.
The stoichiometry of the metachromatic complex has been studied and the molar ratio of dye: phytate has been shown to vary with varying proportions of dye and phytate used in the reaction mixture and a maximum value of 10 could be obtained suggesting a steric hindrance for the attachment of dye to the phytate-molecule.
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4.
The divalent cations like, Ba++, Mg++, and Mn++ interfered with the formation of metachromatic complex, possibly competing with the dyes for the anionic sites of the phytate molecule.
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Mandal, N.C., Biswas, B.B. & Pal, M.K. Metachromasia induced by inositol-hexa-phosphate with toluidine blue. Histochemie 18, 202–209 (1969). https://doi.org/10.1007/BF00306167
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DOI: https://doi.org/10.1007/BF00306167