MJ Ansari, S Ahmad, K Kohli, J Ali, and R. K. Khar. Stability-indicating HPTLC determination of curcumin in bulk drug and pharmaceutical formulations. Journal of Pharmaceutical and Bio-medical Analysis. 2005; 39: 132-138. (Impact Factor 3.17).
A simple, selective, precise and stability-indicating high-performance thin-layer chromatographic method of analysis of curcumin both as
a bulk drug and in formulations was developed and validated. The method employed TLC aluminium plates precoated with silica gel 60F-
254 as the stationary phase. The solvent system consisted of chloroform:methanol (9.25:0.75 v/v). This system was found to give compact
spots for curcumin (Rf value of 0.48±0.02). Densitometric analysis of curcumin was carried out in the absorbance mode at 430 nm. The
linear regression analysis data for the calibration plots showed good linear relationship with r = 0.996 and 0.994 with respect to peak height
and peak area, respectively, in the concentration range 50–300 ng per spot. The mean value±S.D. of slope and intercept were 1.08±0.01,
51.93±0.54 and 8.39±0.21, 311.55±3.23 with respect to peak height and area, respectively. The method was validated for precision,
recovery and robustness. The limits of detection and quantitation were 8 and 25 ng per spot, respectively. Curcumin was subjected to acid
and alkali hydrolysis, oxidation and photodegradation. The drug undergoes degradation under acidic, basic, light and oxidation conditions.
This indicates that the drug is susceptible to acid, base hydrolysis, oxidation and photo oxidation. Statistical analysis proves that the method
is repeatable, selective and accurate for the estimation of said drug. As the method could effectively separate the drug from its degradation
product, it can be employed as a stability-indicating one.
Stability-indicating HPTLC determination of curcumin in bulk drug and pharmaceutical formulations
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