Characterization of terminal variants to identify truncation sites, sequence integrity, and relative abundance. This analysis supports assessment of product heterogeneity, stability, and process-related modifications.

Identification and characterization of protein isomers, including isoaspartate formation and other structural variants. This analysis helps assess structural integrity, degradation pathways, and potential impact on function and stability.

Detection and characterization of residual host cell proteins using orthogonal methods such as ELISA and LC-MS/MS. This analysis supports process development, impurity profiling, and regulatory compliance.

Comprehensive analysis of protein glycosylation, including glycan identification, quantification, and site-specific mapping. We characterize glycoform distribution, structure, and heterogeneity to support product quality, efficacy, and regulatory requirements.

Characterization and quantification of deamidation at asparagine (Asn) residues, a critical post-translational modification that can impact protein stability, charge heterogeneity, and biological activity. This analysis supports CQA assessment and stability studies.

Separation and characterization of charge variants arising from sequence modifications or PTMs (e.g., deamidation, sialylation, C-terminal lysine). These studies are critical for understanding heterogeneity, stability, and biological activity.

Analysis of C-terminal lysine variants in monoclonal antibodies to assess heterogeneity and enzymatic processing. This characterization supports product consistency and comparability studies.

Forced degradation and stress studies to evaluate protein stability under thermal, oxidative, pH, and mechanical conditions. This testing helps identify degradation pathways and supports formulation development and stability-indicating methods.

Quantitative determination of amino acid composition for protein therapeutics. This method supports protein concentration determination, identity confirmation, and lot-to-lot consistency.

Comprehensive analysis of protein aggregation, including detection, characterization, and quantification of soluble and insoluble aggregates. We assess size distribution, structural properties, and formation pathways to support stability studies and manufacturing process optimization.