Downloads: 124
Research Paper | Chemistry | Volume 7 Issue 7, July 2018 | Pages: 1077 - 1080 | India
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
How to Cite?: Amitabha Saha, "Metachromasia Induced in Cationic Dyes by Neem (Azadirachta indica) Polysaccharide", Volume 7 Issue 7, July 2018, International Journal of Science and Research (IJSR), Pages: 1077-1080, https://www.ijsr.net/getabstract.php?paperid=ART2019131, DOI: https://dx.doi.org/10.21275/ART2019131