A Novel Stability-Indicating RP-HPLC Method for the Simultaneous Estimation and In Vitro and In vivo Evaluation: Curcumin and Naringin Co-amorphous System

Curcumin (CUR) is a phytochemical widely used in food industries, cosmetics, and in the treatment of various ailments. It is a polyphenol derived from turmeric and is often considered the golden spice. CUR has a low solubility of less than 1 µg/ml and poor oral bioavailability which can be improved by co-amorphization with naringin (NRG). Analytical method to simultaneously quantify CUR and NRG is not reported in literature. This study aimed to develop a stability-indicating reverse phase HPLC method in gradient mode to simultaneously quantify CUR and NRG in co-amorphous system. The co-amorphous system of CUR and NRG in molar ratios 1:1 and 1:2 was prepared by quench cooling technique. The separation was attained on a Genesis C18, (4.6 mm × 150 mm, 4 µm) column with the mobile phase comprising of methanol and a 0.1% acetate buffer pH 3.8 at a single wavelength, 289 nm. CUR and NRG eluted at 5.1 and 11.1 min, respectively. For both the molecules, the linearity range was 0.125–16 µg/ml with LOD and LOQ of 0.063 and 0.125 µg/ml. The method developed was validated as per International Conference on Harmonization (ICH) guidelines for linearity, accuracy, precision, and robustness. The method was used to estimate CUR and NRG content in co-amorphous mixture and for in vitro evaluation.

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