Laboratory Equipment

Noninvasive Optical Sensor Technology in Shake Flasks

In process development, appropriate scaling is important to achieve acceptable product quality without compromising titer (1). Scale-down approaches involve matching the oxygen transfer coefficient (kLa) value, impeller tip speed, power per unit volume, or mixing time to those of a bioreactor (2). Bench-top bioreactors are typically used in bioprocess engineering as scale-down models of commercial units in fermentation and cell culture because of their similarity in geometry (H/D ratio) and mechanical properties (agitation type and sparging). By contrast, shaking culture…

A Single-Use Bioreactor for Both Cell and Microbial Cultures: A Dream Becomes Reality

Application of single-use equipment is common practice in the biopharmaceutical industrial and academic field. Compared to the traditional glass or stainless steel bioreactors, single-use bioreactors offer clear advantages: a quicker turnaround time; minimal utilities required; greatly reduced risk of cross contamination; more operational flexibility; reduced validation requirements. However, until recently, single-use bioreactors have a restricted application, only to animal cell cultures due to limitations in mixing and mass-transfer. As single-use technology not only has significant benefits for cell culture processes,…

Evaluating AMMP Protein A Assays: Comparing Sample Preparation Methods, Ligand Performance & Assay Performance

Regulations governing the production of biopharmaceuticals require high levels of purity for processes utilizing Protein A affinity chromatography. It has been shown that Protein A in the presence of IgG forms a PA/IgG complex that interferes in the traditional immunoassay format for detecting Protein A. In this work we evaluated the AMMP Protein A Assay using two popular sample preparation methods to dissociate the ProteinA/IgG complex. The AMMP assay was also tested with Protein A ligands from multiple sources including…

Optical Oxygen and pH Sensors for Monitoring Biofermentation Processes

Advances in high-performance sensor materials and optoelectronics have enabled optical sensors for use in markets including the life sciences, environmental, food and beverage, process control and biotechnology. Compared with traditional electrochemical sensing techniques such as galvanic, paramagnetic and fuel cell sensors, these optical sensors can be made in small and customizable form factors such as probes and self-adhesive patches. The sensors also have fast response, provide long-term stability and are chemically inert. This experiment demonstrates the viability of optical sensors…