--- type: "WebPage" title: "Quantification of Residual Reagents (BSA, Benzonase) in the Laboratory" description: "Secure batch compliance with ultra-sensitive, validated process impurity analysis The Challenge of Process-Related Impurities During the production of biomolecules (monoclonal antibodies, vaccines, viral vectors), the introduction of auxiliary reagents is essential to optimize cell culture and downstream processing (downstream). However,..." resource: "https://filab.fr/en/sectors-of-activity/biopharmaceutical/quantification-residual-reagents-bsa-benzonase/" tags: ["EN", "pll_6a1942a9af16d", "Anaïs DECAUX"] timestamp: "2026-06-03T13:58:23Z" published: "2026-06-01T14:00:46Z" language: "en" author: "Laure Durieux" --- # Quantification of Residual Reagents (BSA, Benzonase) in the Laboratory ## Secure batch compliance with ultra-sensitive, validated process impurity analysis ### The Challenge of Process-Related Impurities During the production of biomolecules (monoclonal antibodies, vaccines, viral vectors), the introduction of auxiliary reagents is essential to optimize cell culture and downstream processing (*downstream*). However, these substances must be drastically removed from the final product: **Bovine Serum Albumin (BSA):** used as a cell growth supplement, it presents major risks of **immunogenicity** and transmission of pathogens to humans. **Benzonase:** introduced to digest residual host cell DNA, this active enzyme must not be injected into the patient, as it could cause **inflammatory reactions** or degrade therapeutic nucleic acids (in the case of gene therapies). Regulatory authorities (EMA, FDA, ICH Q6B) require rigorous proof of the clearance of these reagents. Their final concentrations must often be reduced to **undetectable traces** (on the order of ng/mL or ppm). ## Our Analytical Solutions for the Quantification of Residual Reagents (BSA, Benzonase) ### LC-MS/MS For the detection and quantification of residual [proteins](https://filab.fr/en/sectors-of-activity/biopharmaceutical/biotherapeutic-recombinant-protein-characterization/protein-analysis.md) such as BSA or Benzonase, we favor targeted [LC-MS/MS](https://filab.fr/en/our-technical-resources/altis-lc-msms-analysis.md) approaches. After enzymatic digestion, quantification is performed using specific marker peptides for the target protein. ## Why Choose FILAB for the Quantification of Residual Reagents (BSA, Benzonase) Entrusting your analyses to the FILAB laboratory allows you to benefit from state-of-the-art equipment without investing in heavy in-house development. - **Compliance with international guidelines:** our analyses align with the requirements of the European (Ph. Eur.) and American (USP) pharmacopoeias, as well as the [ICH Q6B](https://filab.fr/en/our-services/rd/laboratory-analytical-chemistry-training/ich-q6b-training.md) guidelines. - **Expert scientists:** a team of PhD researchers and engineers specialized in molecular biology and biopharmaceutical method validation. - **Traceability and data integrity:** complete, detailed, and structured analytical reports ready to be directly integrated into your CTD registration files. - **Flexible volumes:** from one-off testing during the R&D phase to monitoring pre-clinical and clinical production batches. ## Our Services Dedicated to Biopharmaceutical Product Analysis Identity and structure of biomolecules: primary sequence ([peptide mapping](https://filab.fr/en/sectors-of-activity/biopharmaceutical/biotherapeutic-recombinant-protein-characterization/peptide-analysis-biopharmaceutical-services.md)), [de novo sequencing](https://filab.fr/en/sectors-of-activity/biopharmaceutical/biotherapeutic-recombinant-protein-characterization/de-novo-protein-sequencing.md) Secondary and tertiary structure analysis: thermal stability, [circular dichroism (CD)](https://filab.fr/en/sectors-of-activity/biopharmaceutical/measurement-circular-dichroism-cd.md), UV/visible profiles and analysis by [FTIR](https://filab.fr/en/our-technical-resources/laboratory-analysis-ftir-spectroscopy.md) [Monosaccharide composition analysis](https://filab.fr/en/sectors-of-activity/biopharmaceutical/monosaccharide-structure-analysis-laboratory.md) Analysis and localization of [disulfide bridges](https://filab.fr/en/sectors-of-activity/biopharmaceutical/disulfide-bridge-analysis.md) [Glycosylation analysis](https://filab.fr/en/sectors-of-activity/biopharmaceutical/glycosylation-analysis.md) [Residual host cell DNA analysis](https://filab.fr/en/sectors-of-activity/biopharmaceutical/residual-host-cell-dna-analysis.md) Discover Our Blog Article ## What is residual DNA? [Learn more](https://filab.fr/en/blog/2026/03/blog-residual-dna-impurities-contaminants-biopharma.md) ## Our FAQ How can I get a quote from FILAB? To get a quote, you can contact our teams via our contact form, by phone, or by email. Simply send us your requirements (type of material, analysis requested, any standard, urgency, number of samples, etc.). We will then send you a personalized technical and pricing proposal within 24-48 hours. What is the typical analysis turnaround time? Turnaround times vary depending on the nature of the analysis and the complexity of the expert assessment project. However, FILAB is committed to providing fast turnaround times tailored to your constraints and industrial urgencies. What are your quantification limits (LOQ) for BSA at FILAB laboratory? Thanks to the sensitivity of our Orbitrap and Q-TOF systems and our optimized extraction protocols, we achieve quantification limits on the order of **parts per million (ppm)**, or even **ppb (parts per billion)**, depending on the nature of your matrix. This fully meets the safety requirements of regulatory agencies (EMA, FDA). Does the mass spectrometry method at FILAB laboratory make it possible to check whether Benzonase is still active? LC-MS/MS quantifies the **total (structural) protein amount** of residual Benzonase. For regulatory authorities, proving the physical absence of the enzymatic protein is the most robust safety evidence. If the enzyme is absent or present below the detection limit, the risk of residual activity is mathematically ruled out. Are the analytical methods (Orbitrap / Q-TOF / SEC) at FILAB laboratory validated? Yes. All our process impurity quantification methods are developed, qualified, and validated in strict compliance with international **ICH Q2(R1)** guidelines. For each project, we assess the specificity, linearity, accuracy, precision (repeatability/reproducibility), and robustness of the method in *your* specific matrix.