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Pharmaceutical Manufacturing Handbook: Production and

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SCIENTIFIC ISSUES RELATED TO FOLLOW-ON PROTEINS 49<br />

TABLE 6 Analytical Techniques for Physicochemical Characterization of Proteins<br />

Parameter<br />

Test<br />

Primary structure<br />

Amino acid sequencing, N - terminal Edman<br />

sequencing, peptide mapping<br />

Higher order structure CD, NMR, FTIR, Raman<br />

Mass<br />

LC - ESI - MS, MALDI - TOF - MS<br />

Size<br />

SDS - PAGE, DLS, SEC - MALLS<br />

Hydrophobicity<br />

RP - HPLC<br />

Binding<br />

Immunological binding<br />

Sulfhydryl groups/disulfi de bridges Peptide mapping (under reducing <strong>and</strong> nonreducing<br />

conditions)<br />

Glycan analysis:<br />

Monosaccharide analysis<br />

HPLC, MS<br />

Sialic acid content<br />

HPLC<br />

Molecular weight<br />

MALDI - MS, ESI - MS<br />

Impurity profi le<br />

Process - related impurities Immunoassay, HPLC, SDS - PAGE, MS, CD, capillary<br />

• Cell substrate derived<br />

gel electrophoresis, size exclusion chromatography<br />

• Cell culture derived<br />

• Downstream derived<br />

Product - related impurities<br />

• Truncated forms<br />

• Other modifi ed forms (i.e.,<br />

deamidated, isomerized)<br />

• Aggregates<br />

Evaluation of stability<br />

HPLC<br />

CD, Circular Dichroism; NMR, Nuclear Magnetic Resonance; FTIR, Fourier transform infrared spectroscopy;<br />

LC - ESI - MS, Liquid chromatography electrospray ionisation mass spectrometry; MALDI -<br />

TOF - MS, Matrix - assisted laser desorption ionization - time of fl ight - mass spectrometry; SDS - PAGE,<br />

Sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis; DLS. Dynamic light scattering; SEC -<br />

MALLS, Size exclusion chromatography - multi - angle laser light scattering; RP - HPLC, Reversed phase -<br />

high performance liquid chromatography; HPLC, High performance liquid chromatography; MALDI - MS,<br />

Matrix - assisted laser desorption ionization mass spectrometry; ESI - MS, Electrospray ionisation mass<br />

spectrometry; MS, Mass spectrometry.<br />

• Application of a comprehensive array of analytical techniques to fully characterize<br />

the drug product at each stage of development. Table 6 provides examples<br />

of methods to probe virtually every property of the protein <strong>and</strong> develop<br />

a fi ngerprint of the molecule.<br />

Other Testing Requirements The need for additional supportive studies beyond<br />

physicochemical characterization will increase proportionately with the complexity<br />

of the protein drug. The entire battery of tests may not be required for each FOP<br />

but may include the following data, bioassay, preclinical (pharmacology/toxicology/<br />

pharmacokinetic/pharmacodynamic), clinical safety <strong>and</strong> effi cacy, <strong>and</strong> immunogenicity.<br />

The nature, number, <strong>and</strong> size of the trials should relate directly to the particular<br />

drug/indication/patient population.<br />

Bioassay A biological assay, or “ bioassay, ” is an analytical procedure capable of<br />

measuring the biologic activity of a substance based on a specifi c functional, biologic

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