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Hepatitis B Surface Antigen Particle Purification by Immunoaffinity Chromatography Based on CDI-CB.Hep-1 mAb Monolithic Supports

by Rodolfo Valdés, Urh Černigoj, Eduardo Sánchez, Daily Hernández, Blass Nemec, Miladys Limonta, Miguel Castillo, Bárbara Pérez, Urška Vidic, Jana Vidič, Mirjan Žorž, Andrés Tamayo, Leonardo Gómez, Williams Ferro, Yurisley Aldama, Nika Lendero Krajnc, Daniela Marc, and Aleš Štrancar
Volume 17, Open Access (June 2018)

Bead matrices have been used in affinity chromatography to purify molecules in multiple applications. For instance, the hepatitis B surface antigen (HBsAg) is one of the molecules purified by this technique for human vaccine development programs. However, the use of monolithic supports have emerged as the advantageous choice for affinity chromatography based on convective mass transfer, a high number of channels, and low backpressures at high flow rates. For this reason, several experiments were conducted to determine the suitability of CB.Hep-1 monoclonal antibody (mAb) immunosorbent developed on carboxyimidazole (CDI)-monolithic supports (ligand concentrations: 0.5, 1.0, and 7.0 mg/mL) for HBsAg particle purification. Key results from this study show the highest amounts of HBsAg adsorbed (3059.31 ± 865.71 μg HBsAg/mL immunosorbent, n = 2), and HBsAg eluted (2884.50 ± 541.01 μg HBsAg/mL immunosorbent, n = 2), were estimated in the 1.0 mg/mL-CDI-CB. Hep-1 mAb monolithic support immunosorbents. In addition, the ligand leakage was always < 3 ng mAb/μg HBsAg (approved limit) in the 1.0 mg/ mL-CDI-CB.Hep-1 mAb immunosorbents. Experiments also evidenced the high purity and molecular homogeneity of purified HBsAg particles (< 95 %) across 20 purification cycles. Therefore, the ligand concentration could be reduced up to 1.0 mg/mL, which would enable a notable decrease in the mAb amount required for vaccine manufacturing, as compared to bead matrices (4.0 mg/mL). This study demonstrated that CDI-CB.Hep-1 mAb monolithic support immunosorbents are best suited for assessing the large-scale purification performance of HBsAg particles for human vaccine development programs at low ligand concentration and high flow rates...

Valdes R et al. Hepatitis B surface antigen particle purification by immunoaffinity chromatography based on CDI-CB.Hep-1 mAb monolithic supports. BioProcess J, 2018; 17.

Posted online June 5, 2018.

Performance Challenging Fetal Bovine Serum (FBS) and FBS Alternatives

by William Siegel
Volume 17, Open Access (May 2018)

Growth performance testing in cell culture is an effective approach to making serum suitability and purchase decisions. An independent commercial testing lab conducted two separate and sequential growth promotion studies to underscore the need for pre-purchase lot performance testing with: (1) FBS; and (2) FBS alternatives. Results from both studies are presented here to compare and contrast:
• FBS lots to each other
• FBS alternatives lots to each other
• FBS alternatives lots to FBS
FBS alternatives are included because they are often overlooked as a cost-effective substitute for FBS, providing, in many cases, equivalent performance. It is advisable to avoid preconceived notions concerning the quality or performance of a serum product without considering the culture system, culture conditions, and the subject cells, which can all have a material impact on its performance in cell culture.
Test – then decide...

Siegel W. Performance challenging fetal bovine serum (FBS) and FBS alternatives. BioProcess J, 2018; 17.

Posted online May 21, 2018.

Integrating Development Tools into the Process Validation Lifecycle to Achieve Six Sigma Pharmaceutical Quality

by Mark F. Witcher, PhD
Volume 17, Open Access (April 2018)

Achieving very high levels of pharmaceutical product quality, particularly for the next generation of biologics, will require proactive use of a broad range of quality and process development tools throughout the therapeutic’s development and manufacturing lifecycle. These tools are most effective when integrated using an expanded form of FDA’s 2011 process validation guidelines. This article explains how process validation can be combined with quality by design (QbD), ICH Q8 design space (DS) and control strategies (CS), process analytical technology (PAT), and quality risk management (QRM) tools to provide a path to manufacturing very high-quality products. The approach establishes clear goals and then proactively builds appropriate control systems during process development to assure continuous control and verification of all manufacturing activities. Prospectively using the tools over the complete manufacturing lifecycle, from preclinical through commercial manufacturing, is particularly important to assure comparability from early product research and development all the way to commercialization. The continued evolution of these quality tools, as well as building new tools, will provide a path for the pharmaceutical industry to reach and maintain Six Sigma levels of product quality...

Witcher MF. Integrating development tools into the process validation lifecycle to achieve six sigma pharmaceutical quality. BioProcess J, 2018; 17.

Posted online April 13, 2018.

Gamma Irradiation of Animal Serum: Maintaining the Cold Chain Throughout the Process

by Sue Brown, Bart Croonenborghs, PhD, Kevin Head, Mara Senescu, Raymond Nims, PhD, Mark Plavsic, PhD, DVM, and Rosemary J. Versteegen, PhD
Volume 17, Open Access (January 2018)

This paper reviews the importance of maintaining low temperature storage and handling (i.e., cold chain) for animal serum through all stages of processing, from finished product to the actual end-user. This cold chain extends from serum manufacture through the irradiation process, during shipment back to the supplier post-irradiation, as well as storage at supplier, irradiation, and end-user facilities. Anecdotal experience and theoretical considerations emphasize the point that maintenance of the cold chain is necessary for preserving the performance of serum for cell culture and other applications...

Brown S, Croonenborghs B, Head K, Senescu M, Nims R, Plavsic M, Versteegen RJ. Gamma irradiation of animal serum: maintaining the cold chain throughout the process. BioProcess J, 2018; 17.

Posted online January 17, 2018.

A Method for Differentiating Fetal Bovine Serum from Newborn Calf Serum

by Michelle Cheever, Alyssa Master, PhD, and Rosemary J. Versteegen, PhD
Volume 16, Open Access (December 2017)

The continued use of animal serum as an important component in biotechnology manufacturing processes has raised questions regarding both the reliability of geographic origin and possible adulteration of product. The International Serum Industry Association (ISIA) has implemented a traceability certification program designed to demonstrate traceability from slaughterhouse or abattoir to the end-user. This is based on an audit performed by an independent, approved third-party auditor according to an approved audit plan, using a detailed audit checklist. Recent advances have led to the development of a complementary testing program to determine geographic origin of material. The methodology described in this paper differentiates fetal bovine serum from newborn calf serum on the basis of biochemical composition...

Cheever M, Master A, Versteegen R. A method for differentiating fetal bovine serum from newborn calf serum. BioProcess J, 2017; 16.

Posted online December 22, 2017.

Novel Lipid Delivery Mechanism of Cell-Ess Increases Higher Order Glycoforms and the Consistency of Glycan Patterns on Monoclonal Antibodies Produced by CHO Cells

by Adam Elhofy, PhD and Justin A. Beller, PhD
Volume 16, Open Access (October 2017)

Glycosolation drives protein quality and therapeutic benefits in protein-based therapies. Recently, there has been a push in the pharmaceutical industry to improve the consistency and quality of the glycan patterns on therapeutic proteins like monoclonal antibodies. Post-translational modification begins in the endoplasmic reticulum but is finished in the Golgi where more complex glycans are added. In this study, the addition of lipids via a novel mechanism provided by the medium supplement, Cell-Ess®, improves the consistency in glycan patterns so that they are more reproducible between product batches. The effect of media supplementation with Cell-Ess on the variation of glycan patterns was measured in two different media formulations across two separate experiments. Supplementation with Cell-Ess resulted in a statistically significant reduction in the variation of glycoforms when measured by the standard error of the mean. In addition, to improved consistency, there were increased higher glycoforms or galactosylation. There was also significantly more total galactosylation and significantly fewer lower glycoforms for antibodies produced by CHO cells supplemented with Cell-Ess. These data taken together suggest that the addition of lipids via Cell-Ess results in a more functional Golgi and an associated improvement of protein quality and consistency...

Elhofy A, Beller JA. Novel lipid delivery mechanism of Cell-Ess increases higher order glycoforms and the consistency of glycan patterns on monoclonal antibodies produced by CHO cells. BioProcess J, 2017; 16.

Posted online October 2, 2017.

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