PharmTech spoke with Tim Freeman of Freeman Technology; David Beach, technology advisor and consultant to Accu-Break Pharmaceuticals; and Thierry Menard, lab manager, and Bruno Villa, president, both at Medelpharm, about challenges and innovations in tablet splitting and scoring.
Whilst a key aspect of tablet splitting has always been on how uniformly the active ingredient is distributed within the finished product, it is equally important to understand how to produce tablets with the required mechanical integrity and properties. Advances in spectroscopic techniques, such as near infrared (NIR) and laser-induced breakdown spectroscopy (LIBS), mean that it is now possible to analyse content uniformity across the surface of a tablet. In addition, advances in powder characterization techniques can assist in the development of truly robust manufacturing processes.
Poor content uniformity is often attributed to the difficulty of achieving a homogeneous blend to begin with, which may be because the active ingredient is present at very low levels or is cohesive and prone to agglomeration. Alternatively, if the API has significant particle size or density difference to the excipients in the blend, it may be liable to segregation post blending. Dynamic powder characterization can help optimize the blending process (1) and also predict the likelihood of segregation. It, therefore, brings real insight into how to address these issues.
Furthermore, dynamic parameters in combination with shear and bulk properties, support a comprehensive understanding of powder behavior, whether during the blending process itself, or when processed through the tablet press. Together these properties help manufacturers to rationalize and control powder performance during discharge from the hopper, whilst flowing through the feed frame, and during filling of the die. In addition, they provide information relating to the compressibility characteristics of the blend, as well as quantifying the ease with which air is entrained and released, both of which impact finished tablet quality. This information can be extremely helpful in ensuring compatibility between the process equipment selected and the properties of the blend, a match that is crucial for ensuring content uniformity in scored tablets.