Processing and Evaluation of Dicalcium Phosphate and Lipid Comprised Co-Processed Excipient

The adaptability of co-processed excipients significantly supports the direct compression process in pharmaceutical formulations. This research aimed at developing and assessing a co-processed excipient, made from dicalcium phosphate and lipid excipients, using hot melt granulation to improve drug delivery. Four lipids—glyceryl monostearate, stearic acid, cetyl alcohol, and palmitic acid—were investigated to process raw dicalcium phosphate. Key parameters such as powder flow properties and density were analyzed to select the optimal lipid combination and concentration. Advanced analytical techniques, including DSC, X-ray diffraction, FT-IR, and SEM, were used to assess the compatibility and stability of the co-processed excipients. The DSC analysis of the caffeine tablet formulation (CA 90:10) showed a melting point of 275.74 ºC, while FT-IR spectra indicated no interaction between caffeine, cetyl alcohol, and other excipients. X-ray diffraction analysis confirmed the drug’s crystalline structure, showing distinct peaks in the formulation's diffractogram. SEM images displayed a porous and rough surface morphology with microcapillaries, contributing to rapid water absorption and wicking. The performance of the developed dicalcium phosphate co-processed excipient was tested by formulating caffeine immediate-release tablets. The lipid-based excipient demonstrated enhanced drug solubility, dissolution, and bioavailability. The study concluded that lipid co-processed excipients, particularly cetyl alcohol, play a vital role in improving drug delivery systems. This research lays the groundwork for future developments in optimized drug formulations using co-processed excipients.