International Journal of Science and Research (IJSR)

International Journal of Science and Research (IJSR)
Since Year 2012 | Open Access | Fully Refereed | Peer Reviewed

ISSN: 2319-7064




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Research Paper | Chemistry | India | Volume 7 Issue 7, July 2018


Metachromasia Induced in Cationic Dyes by Neem (Azadirachta indica) Polysaccharide

Amitabha Saha [2]


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

Metachromasia Induced in Cationic Dyes by Neem (Azadirachta indica) Polysaccharide


How to Cite this Article?

Amitabha Saha, "Metachromasia Induced in Cationic Dyes by Neem (Azadirachta indica) Polysaccharide", International Journal of Science and Research (IJSR), https://www.ijsr.net/get_abstract.php?paper_id=ART2019131, Volume 7 Issue 7, July 2018, 1077 - 1080, #ijsrnet

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