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UV, and IR spectra of aqueous solutions/dispersions of sodium carboxy methyl cellulose (CMC), Tween 80, and sodium
lauryl sulphate (SLS) during aging at different temperatures. Significant reduction in viscosity ofh sodium CMC occurred
during aging studies, while relatively small decrease in viscosity was seen with Tween 80 and SLS. Increment in specific
conductivity was seen with aging of excipients. Significant increase of zeta potential was also seen with aging of samples.
Concomitant shift in IR spectra of samples was observed with aging at 40Â°C.
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