Scale-Down Model Development in ambr™ systems: An Industrial Perspective.

High-Throughput (HT) technologies such as miniature bioreactors (MBRs) are increasingly employed within the biopharmaceutical manufacturing industry. Traditionally, these technologies have been utilized for discrete screening approaches during pre-clinical development (e.g. cell line selection and process optimization). However, increasing interest is focused towards their use during late clinical phase process characterization studies as a scale-down model (SDM) of the cGMP manufacturing process. In this review, we describe a systematic approach towards SDM development in one of the most widely adopted MBRs, the ambr™ 15 mL and 250 mL (Sartorius Stedim Biotech) systems. Recent efforts have shown promise in qualifying ambr™ systems as SDMs to support more efficient, robust and safe biomanufacturing processes. We suggest that combinatorial improvements in process understanding (matching of mass transfer and cellular stress between scales through computational fluid dynamics and in vitro analysis), experimental design (advanced risk assessment and statistical design of experiments) and data analysis (combining uni- and multi-variate techniques) will ultimately yield ambr™ SDMs applicable for future regulatory submissions.