Downloads: 117
Research Paper | Chemistry | India | Volume 7 Issue 7, July 2018
Metachromasia Induced in Cationic Dyes by Neem (Azadirachta indica) Polysaccharide
Abstract: Aqueous extract of Neem (Azadirachta indica) tree exudate gum furnishes, a polysaccharide material (NP) having high equivalent weight (10855). NP induces slight spectral shift in toluidine blue (TB, 1x10-5M) and distinct multiple banded metachromasia in more aggregating thiazine dye 1, 9-dimethylmethylene blue (DMMB, 1x10-5M). Weak chromotropic ability of NP is reflected in its failure to induce metachromasia in methylene blue (MB, 1x10-5M). NP induces strong metachromasy (blue shift ~100nm) in dye pinacyanol chloride (PCYN, 1x10-5M). Half plateau values signifying destruction of metachromatic compounds to the extent of 50 % correspond to 25 %, 18 % and 28 % ethanol for DMMB-NP, TB-NP and PCYN-NP systems respectively. Negative S values for the DMMB-NP and PCYN-NP systems indicate the formation of ordered structures during the formation of dye-polysaccharide complexes.
Keywords: Metachromasia, Cationic dyes, Neem Polysaccharide, Chromotrope, -band
Edition: Volume 7 Issue 7, July 2018,
Pages: 1077 - 1080
Similar Articles with Keyword 'band'
Downloads: 125
Research Paper, Chemistry, United Kingdom, Volume 4 Issue 1, January 2015
Pages: 1527 - 1529Antibacterial Studies of Leucine Complexes of Fe (III) and Cu (II)
K. Asemave [3] | B. A. Anhwange | T. J. Anom
Downloads: 2
Research Paper, Chemistry, Sudan, Volume 10 Issue 7, July 2021
Pages: 621 - 626Preparation and Characterization of Salicylhydroxamic acid and its Complexes with Iron (III), Cobalt (II) and Manganese (II)
Leena Salah Ibrahim [2] | Elmugdad Ahmed Ali [4] | Mohammed Sulieman Ali [2]