In the field of molecular biology and diagnostics, eliminating nucleic acid residues is crucial for ensuring accurate and reliable test results. Contamination from residual nucleic acids can obscure low-abundance targets, cause false positives, and reduce the specificity of diagnostic reagents. Hzymes Biotech has developed an ultra-clean enzyme purification platform to address these challenges, ensuring high-purity enzyme raw materials with minimal host cell DNA (HCD) contamination.

Diagnostic Challenges Posed by Nucleic Acid Residues

Nucleic acid contamination presents significant challenges in molecular diagnostics, particularly in detecting pathogens such as respiratory viruses, gut microbiota, and bloodstream infections using techniques like PCR, tNGS, and mNGS. Excessive nucleic acid residues in enzyme raw materials can compromise amplification specificity and accuracy, leading to unreliable diagnostic results. To meet stringent in vitro diagnostic requirements, enzyme raw materials must achieve HCD levels as low as ≤ 0.001 copies/U or even undetectable.

Purification Strategies for Ultra-Clean Molecular Enzymes

Achieving ultra-clean enzyme production requires a two-pronged approach: controlling external contamination and implementing rigorous internal purification processes.

External Contamination Control Measures

• Laboratory and Production Design: Implementing a well-structured layout with designated clean zones minimizes cross-contamination.
• Use of Disinfectants: Regular application of 70%-80% ethanol and sodium hypochlorite to surfaces and equipment effectively reduces environmental nucleic acids.
• GMP Quality Standards: Wearing protective gear (gloves, masks, lab coats), avoiding direct contact with materials, and using closed systems limit manual contamination.
• Single-Use Consumables: Items such as glycerol and pipette tips, when used as single-use components, significantly reduce contamination risks.

Internal Purification Strategies for Nucleic Acid Removal

1.Preliminary Nucleic Acid Purification:
1.Cell Lysis and Precipitation: Negatively charged nucleic acids bind to positively charged substances like polyethyleneimine (PEI), streptomycin sulfate, or protamine sulfate.
1.Enzymatic Digestion: DNase I or Benzonase enzymes break down nucleic acids, with optimal conditions determined through DOE analysis.
2.Chromatography-Based Purification Methods:
1.Heparin Chromatography: Mimics nucleic acid interactions to significantly reduce HCD levels.
1.Anion Exchange Chromatography: Effectively separates nucleic acids from target proteins by tightly binding nucleic acids.
1.Gel Filtration Chromatography: Uses high-salt conditions to separate nucleic acids, followed by protein refolding to minimize contamination.
1.Hydrophobic and Composite Chromatography: Media like Capto Adhere enhance nucleic acid removal, widely applied in viral purification.
3.Optimization of Chromatography Combinations:
1.Implementing optimized sequences such as affinity → HIC → anion exchange can reduce HCD levels to as low as 0.000015 pg/μL, far surpassing traditional purification methods.

Process Monitoring and Optimization

Tracking nucleic acid residue levels is integral to enzyme purification. Beyond eliminating contamination, Hzymes Biotech monitors overall recovery rates and enzyme purity, refining processes continuously to achieve optimal results.

Hzymes’ Ultra-Clean Enzyme Development Platform

Hzymes Biotech has established a proprietary enzyme purification platform with stringent quality controls, producing ultra-clean enzyme series including:

• Taq DNA polymerase
• M-MLV reverse transcriptase
• mNGS Proteinase K These enzymes maintain extremely low nucleic acid residue levels, ensuring their reliability in molecular diagnostics and research applications.

Ordering and Production Capabilities

Hzymes Biotech operates a Recombinant Protein CMO Platform, leveraging years of expertise in enzyme purification. With advanced facilities and large-scale production capabilities, the company meets diverse industry demands for high-purity molecular enzymes.

Conclusion

The elimination of nucleic acid residues is essential for high-precision molecular diagnostics and research. Through innovative purification techniques, Hzymes Biotech has established a leading platform for ultra-clean enzyme production, ensuring reliable and contamination-free enzymatic solutions for the scientific community.