In biological research and high-end pharmaceutical production, the risk of sample degradation is always a major concern. In fact, over 80% of heat-sensitive biological compounds such as peptides, enzymes, or vaccines undergo structural denaturation when exposed to room temperature or bacterial contamination.

The breaking of hydrogen bonds not only damages R&D projects but also causes significant losses for manufacturers. Products resulting from freezing may become dented, discolored, and their commercial value is directly reduced by 3 to 5 times.

Therefore, maintaining biological activity requires a closed-loop cold chain system that meets cGMP standards. This article analyzes a comprehensive solution, from clean air processing equipment to deep freezing systems, distributed by Duc Duong.

1. Risks of Bioactivity Breakdown

1.1 Mechanism of Three-Dimensional Structure Degradation

Environmental temperatures above 25°C are the main factor destroying weak hydrogen bonds and disulfide bridges in the tertiary and quaternary structures of protein macromolecules. When the three-dimensional structure is lost, the biological molecule completely denatures and loses its ability to bind to the active substrate.
In addition, manual extraction processes often generate heat through mechanical friction. This thermal self-degradation inactivates the catalytic enzymes after only a few minutes of exposure.

1.2 Commercial Losses for High-End Traditional Medicine Products

For businesses producing bird’s nest, cordyceps, collagen, or cosmetic serums, the decrease in the content of heat-sensitive nutrients directly affects P&L. Freeze-dried products are prone to structural deformation, discoloration (grayish-black), and loss of natural flavor.
As a result, their commercial value is reduced by 3 to 5 times compared to the declared standard. Furthermore, the shipment may be rejected during export inspections for demanding markets such as the US, EU, or Japan.

2. Pre-treatment of sterile clean air

2.1 Isolating the risk of cross-contamination using a Class II Biosafety Cabinet

The contamination of mold spores and airborne bacteria is a leading cause of spoilage of extraction solutions before freezing. To eliminate this risk, Duc Duong distributes the domestically manufactured, technically standardized Class II Biosafety Cabinet DD-ATSH-II-1200.
The device integrates a HEPA H14 filter that removes >= 99.995% of dust particles with a size of 0.3 um. The system automatically generates a Class 100 sterile clean air zone, providing absolute protection for both sensitive microbial samples and the technicians handling them.

2.2 Standard Clean Air Flow for Protecting Standard Samples (cGMP)

A downward-moving airflow with a controlled velocity of 0.3 m/s to 0.5 m/s establishes a perfect aerodynamic barrier. This mechanism controls 70% of the recirculated air through the HEPA filter and 30% of the exhaust air through the sterilizer.

The flow structure prevents air turbulence that causes cross-contamination between sample tubes. Therefore, the biological sample preparation process fully meets the stringent microbiological validation requirements of cGMP.

3. Refrigerated Centrifugation for Structure Preservation

3.1 Controlling Negative Temperature Range with Gyrozen 1730R Refrigerated Centrifuge

After the aseptic pre-treatment step, the cell extract needs to be separated from the solids without increasing the temperature. Conventional high-speed centrifugation (>10,000 rpm) generates frictional heat in the chamber, causing the sample temperature to spike above 40°C, leading to coagulation and denaturation of peptide chains.
Duc Duong offers the Gyrozen 1730R refrigerated centrifuge solution, which provides rapid cooling at 17,000 rpm and synchronizes technical data from the manufacturer Gyrozen Korea.

Technical Specifications	Classic Conventional Centrifuge	Gyrozen 1730R Refrigerated Centrifuge
Maximum Centrifuge Speed	10,000 – 12,000 rpm	17,000 rpm (27,237 x g)
Chamber Temperature Control	No heating / Self-heating > 40°C	Temperature Control Range -20°C to +40°C
Fast Cooling Feature	Not supported	Fast Cool reaches 4°C in minutes
Affects heat-sensitive samples	Causes coagulation and denaturation of proteins	Preserves 99% of molecular structure

The Fast Cool system allows the refrigerated centrifuge to lower the rotor chamber temperature by 4°C in a short time. The 17,000 rpm rotation speed combined with negative temperature control eliminates all frictional heat generation.

Gyrozen refrigerated centrifuges are crucial for preserving 99% of biological activity

3.2 Recovery of Clear Extracts Retaining 99% of Activity

The ability to maintain the chamber temperature at 4°C continuously helps to thoroughly isolate and precipitate cell debris. This process does not tear the enzyme membrane or break sensitive drug substance bonds.
The resulting extract has superior purity and retains 99% of its original properties. This is a prerequisite for the subsequent deep-freezing process to achieve optimal results.
To receive a solution for establishing a closed-loop Cold Chain preservation system to maintain biological activity and a set of cGMP-compliant IQ/OQ/PQ validation documents, please fill out the Contact Form at Duc Duong Company to receive immediate support from our application experts.

4. Deep-Freezing Preservation with Temperature Shock Control

4.1 Controlling Deep-Freezing Temperatures with the KMH-050 AS ONE Deep-Freezing Cabinet

After centrifugation, samples need to be immediately placed in a sub-zero temperature environment to freeze all free water molecules. When free water becomes amorphous, 100% of the activity of the degrading enzymes is completely suppressed.
Duc Duong provides the 50-liter KMH-050 AS ONE Japanese model freezer with genuine AS ONE Global data link. Its compact 50-liter capacity and stable sub-zero temperature control make it the perfect choice for R&D sample storage.

4.2 Safe storage of original sample sets with Jeiotech deep freezers

For long-term storage of original sample sets (Master Cell Bank), commercial refrigerators are completely inadequate. Labs need to be equipped with Jeiotech Korean laboratory deep freezers imported by Duc Duong.

Utilizing Cascade Cooling dual compressor technology, Jeiotech’s ultra-low temperature freezer maintains a freezing point of -86°C. Combined with VIP vacuum walls, the freezer prevents the formation of large ice crystals that tear cell membranes.

5. Solutions to overcome the fear of thermal shock

5.1 Protecting original sample sets with 24-hour VIP temperature retention technology

The biggest worry for R&D Directors is power outages causing the freezer to drop in temperature, ruining entire original sample sets worth billions of VND. Jeiotech ultra-low temperature freezers completely eliminate this fear thanks to the VIP vacuum insulation panel.
In the event of a power outage, the VIP insulation maintains the freezer chamber temperature below -50°C for 12 to 24 hours. At the same time, a 4-level warning system will automatically send SMS/Email messages to technicians for timely action.

5.2 Commitment to 24-Hour On-Site Backup Equipment and Technical Support

Besides hardware technology, the fear of component failure is eliminated by Duc Duong’s service policy. We maintain a readily available stock of genuine spare parts in Ho Chi Minh City and commit to having application engineers on-site within 24 hours.

In case of complex incidents requiring repair time, Duc Duong provides temporary on-site backup equipment. This solution ensures the biological assets of the Lab are always 100% safe.

6. cGMP and ISO 17025 Validation Documentation

6.1 Ready-Made IQ/OQ/PQ Validation Documentation for cGMP Factories

Validation Managers often face difficulties in preparing cGMP compliance documentation for cold storage systems. All refrigerator lines supplied by Duc Duong come with a complete set of Installation (IQ), Operation (OQ), and Performance (PQ) validation documentation.

Temperature distribution mapping results (9–12 points) demonstrate that the temperature uniformity of the freezer chamber is ±1°C. This data evidence helps the factory easily pass cGMP audits.

6.2 Standardization of ISO 17025 Digital Temperature Monitoring Log

To maintain ISO/IEC 17025 certification, the lab must demonstrate data integrity throughout the sample storage process. Jeiotech ultra-low temperature freezers integrate a digital data logger, automatically recording temperature logs 24/7 without tampering.
This electronically stored record is ready to be presented to inspection teams from the Drug Administration of Vietnam (DAV) or the Bureau of Accreditation (BOA). Digital standardization completely eliminates errors caused by manual recording.

Conclusion

Preserving the integrity of biological activity is a core requirement determining the success of R&D projects and the commercial value of high-end pharmaceuticals. The integrated solution chain, comprising the Class II DD-ATSH-II-1200 Biosafety Cabinet, Gyrozen 1730R Refrigerated Centrifuge, AS ONE KMH-050 Freezer, and Jeiotech Deep Freezer, creates a closed-loop Cold Chain process compliant with cGMP standards. This system eliminates the risk of cross-contamination, minimizes frictional heat, prevents ice crystallization that tears cell membranes, and maintains safe temperature for 24 hours during power outages. As a result, the company fully protects its original sample collection, enhances product quality, and easily completes ISO/IEC 17025 accreditation documentation. Duc Duong is proud to be a trusted partner providing comprehensive laboratory hardware solutions.
Customers who require consultation on deep freezing systems and wish to receive the IQ/OQ/PQ validation documentation according to cGMP standards, please contact and register at DUC DUONG SCIENCE AND TECHNOLOGY COMPANY for dedicated servic

 

DUC DUONG SCIENCE AND TECHNOLOGY COMPANY

Address: 1014/67 Tan Ky Tan Quy, Binh Hung Hoa Ward, Binh Tan District, Ho Chi Minh City

Tel: (028) 3762 8042 – 3762 8043 – 3750 8514 – 3750 8793

Fax: 028 37628043

Email: ducduong@ducduongco.com

Website: ducduongco.com

ZALO OA: DUC DUONG SCI

 

FAQ

1. Why is pre-processing of biological samples mandatory in a Class II Biosafety Cabinet?

Class II Biosafety Cabinets utilize HEPA H14 filters that remove >= 99.995% of 0.3 µm dust particles, creating a self-contained Class 100 clean air stream. This sterile environment eliminates the risk of mold spores and bacteria from the air entering and degrading biological compounds before freezing.

2. How does the Gyrozen 1730R refrigerated centrifuge protect peptide and enzyme structures?

The Gyrozen 1730R incorporates a rapid cooling system that controls the negative temperature range from -20°C to +40°C. This cold temperature range completely eliminates the heat generated by rotor friction at high speeds (17,000 rpm), preventing the 3D spatial structure of proteins from freezing or denaturing.

3. What are the benefits of the VIP vacuum insulation panels on the Jeiotech ultra-low temperature freezer during a power outage?

The VIP vacuum insulation panels have an extremely low thermal conductivity coefficient. In the event of a power outage, the VIP panels help the Jeiotech ultra-low temperature freezer maintain a safe negative temperature below -50°C for 12 to 24 hours, protecting the Master Cell Bank from thermal shock and damage.

4. Why can’t a regular household refrigerator be used to store R&D biological samples?

Household refrigerators have a very large temperature fluctuation range (+- 5°C to +- 8°C), lack a progressive frost-free mechanism, and have a very slow temperature recovery time. This continuous thermal shock creates large ice crystals that tear cell membranes, causing a loss of 50% – 80% of the sample’s biological activity.

5. What support does Duc Duong Company provide for the cGMP/ISO 17025 validation dossier of the Lab?

Duc Duong provides a complete package of IQ/OQ/PQ validation documents, temperature distribution maps (Temperature Mapping 9–12 points), support for periodic temperature sensor calibration, and consulting on establishing a digital logbook that meets the Data Integrity criteria of the Drug Administration and BOA.