Introduction: Advancing Biopharmaceutical Safety with Precision DNA Detection

In biopharmaceutical manufacturing, residual host cell DNA (HCD) contamination remains one of the most critical quality and safety concerns. To meet stringent global regulatory requirements and ensure product purity, accurate and sensitive host cell DNA quantification is essential.

Hzymes Biotech has upgraded its residual DNA detection product line, covering multiple host systems including CHO, E. coli, Vero, HEK293, Pichia pastoris, and mycoplasma. Among these, the CHO DNA Detection Kit stands out as a high-performance qPCR-based assay designed to deliver fast, reproducible, and regulatory-compliant results. Developed using pharmacopoeia-derived primer and probe sequences, the kit simplifies validation, enhances accuracy, and helps biomanufacturers maintain the highest standards of quality control.

Why Residual Host Cell DNA Detection Matters

During the production of recombinant proteins, monoclonal antibodies, and vaccines, biologics are often expressed in cell lines such as Chinese Hamster Ovary (CHO) cells. Even after purification, trace amounts of host-derived DNA can remain in the final product.

Regulatory agencies—including the U.S. Food and Drug Administration (FDA), European Medicines Agency (EMA), and Pharmacopoeias (USP, EP, ChP)—require that residual DNA content be as low as possible, typically at picogram levels. Excess DNA may pose potential immunogenicity or oncogenic risks, making its detection an essential step in biopharmaceutical quality control.

Traditional methods often lack the sensitivity or specificity to meet these demands, whereas quantitative PCR (qPCR) offers a highly sensitive, standardized, and rapid alternative.

Hzymes’ CHO DNA Assay Kit: Precision Meets Compliance

The Hzymes CHO DNA Detection Kit leverages a qPCR-based detection system that allows for rapid, specific, and quantitative analysis of CHO host cell DNA.

Performance Validated by National Standards

The standard products are calibrated by the national standard products

The standards in the CHO HCD kit were calibrated using the national CHO DNA standard, and the standard from different manufacturers was detected with the same kit, and the deviation of the measured value of the new enzyme standard was less than 5%.

The primer probe sequences for HCDs of CHO, Vero, E. coli, and yeast are from pharmacopoeia

Sensitivity, specificity, repeatability, precision

The test results of real samples are consistent

Simple and convenient

The finished product of the extraction reagent is assembled and used directly, without the need to prepare reagents separately, and the whole set is stored stably at room temperature. Fully automated instrument extraction with pre-packaged kits for flexible on-demand access.

Streamlined Workflow and User Convenience

Honing in on the needs of modern analytical laboratories, Hzymes designed the kit for simplicity and speed without compromising precision.

• Ready-to-use reagents: The extraction reagents come pre-assembled—no reagent preparation required.
• Room-temperature stability: The complete kit maintains performance without the need for cold-chain storage.
• Automation-friendly: Compatible with automated nucleic acid extraction instruments, supporting flexible and scalable testing needs.

This user-centric design allows scientists to obtain accurate qPCR results within two hours, accelerating in-process and release testing while improving laboratory throughput.

Comprehensive Multi-Host Detection Platform

Beyond CHO cells, Hzymes’ Host Cell DNA Detection Product Line includes validated kits for:

• E. coli DNA detection
• Vero cell DNA detection
• HEK293 DNA detection
• Pichia pastoris DNA detection
• Mycoplasma DNA detection

Each kit is built upon the same pharmacopoeia-based design philosophy and quantitative PCR technology, offering consistent accuracy and reliability across diverse host systems. Together, these kits provide a complete solution for residual DNA testing in both manual and automated workflows, supporting various stages of biopharmaceutical process validation.

Applications in Biopharmaceutical Quality Control

The Hzymes CHO DNA Detection Kit serves as a critical tool throughout the biopharmaceutical development and manufacturing lifecycle:

• Process validation: Assessing purification efficiency and DNA clearance in production.
• In-process control: Monitoring residual DNA levels at intermediate stages.
• Final product release testing: Ensuring compliance with pharmacopoeia and regulatory DNA limits.
• R&D and technology transfer: Providing a standardized platform for method development and inter-laboratory comparison.

By integrating Hzymes’ qPCR-based assays into routine quality workflows, biomanufacturers can achieve rapid, reliable, and regulatory-aligned DNA quantification.

Product Information

Left panel shows the amplification plots generated from running the assays with a 10-fold serial dilution from 3fg to 300 pg of CHO genomic DNA that was purified from CHO cell line K-1. On the right is the standard curve along with the slope and correlation coefficient. The amplification efficiency is 97.49%.

Conclusion: Redefining Sensitivity and Compliance in DNA Detection

As biologics manufacturing becomes increasingly complex, ensuring host DNA removal is fundamental to product quality and patient safety. The Hzymes CHO DNA Detection Kit sets a new benchmark for sensitivity (LOD 0.003 pg/μL), reproducibility (CV <10%), and pharmacopoeia compliance, providing biopharmaceutical companies with the confidence to meet the highest global standards.

With its rapid, accurate, and automation-compatible workflow, Hzymes empowers laboratories to advance from conventional DNA detection toward smarter, faster, and more standardized bioprocess quality control.