Regulatory/GMP Compliance

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For decades now, it has been said that "the process is the product" for biologics. Great care and consistency must be applied in their upstream manufacture-during fermentation, harvest, and early purification-to preserve their complex structure, which confers their activity and specificity. As the product moves to late-stage purification, however, the relative concentration of impurities and altered product forms is diminished. Also, the final dosage form of most large molecule biopharmaceuticals is the relatively simple liquid formulation of parenteral dosage form. In contrast, manufacturing the solid dosage forms common for small-molecule drugs involves more complex processes, such as mixing dry powders, granulation, manufacturing controlled-release matrices, and tableting.

After reading Brian O'Connell's column in the February 2006 issue of BioPharm International, entitled, "Will Venture Capital Firms Turn Their Backs on Stem-Cell Research?" one would like to comment. The press is too fascinated by Dr. Hwang's scientific misconduct, which was discovered, and sanctions imposed.

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The Food and Drug Administration recently unveiled its long-awaited Critical Path Opportunities List, which maps out a number of "scientific projects" for improving the testing and production of biotech therapies. In its March report, FDA recognizes that problems in the characterization, testing, and quality management of medical products can delay clinical trials and even completely block drug development.

In the pharmaceutical industry, ultrafiltration (UF) membranes are used extensively in the downstream purification of recombinant proteins or monoclonal antibodies. However, the fouling of membranes after a unit operation?especially when recombinant proteins or monoclonal antibodies are highly concentrated?is a common problem. Typically, normalized water permeability (NWP) of a membrane can be reduced to about 20 percent of its original permeability at the end of an ultrafiltration-diafiltration (UF-DF) operation.