How to choose oil-free screw gas compressor for biological agent freeze-drying process
1. Background of the biopharmaceutical freeze-drying industry
according to Global Market Insights 2023 Data, the global biologics freeze-drying market is expected to reach the level of 2029 $12.6 billionAmong them, the annual growth rate of demand for monoclonal antibody freeze-dried powder injections reaches 23.7%。according to EU GMP Annex 1:2022 Aseptic production specifications, the compressed gas used in the lyophilizer system must meet the requirements of ISO 8573-1 Class 0 Oil control standard (≤0.001mg/m³). In addition, the United States FDA 21 CFR 211.65 It is specially stipulated that the air source for the freeze-drying process must pass through ISO 8573-7:2003 Microbial testing (total aerobic bacteria <1 CFU/10m³).
2. The necessity of oil-free screw compression technology
In the primary drying stage of the lyophilization process, the requirements for compressed gas are very strict:
- dew point temperature must be maximum -60℃(Comply with ISO 8573-2 Class 2).
- Total Volatile Organic Compounds (TVOC) must be < 0.02μg/m³(Comply with ISO 8573-8:2004 detection limits).
according to PDA Technical Report 48 Verification, each increase 0.001mg/m³ Residual oil in the freeze-dried cake will prolong the reconstitution time of the lyophilized cake 18%。Also,WHO TRS 1044 It is also clearly required that the gas source system for biological agent production must ensure that Sulfide content <0.002ppm(According to ASTM D5504-16 test method).
3. Key performance parameters and certification system
- bioburden control: Required ISO 14698-1:2003 Clean room microbial monitoring certification.
- Absolutely no oil guarantee: Oil content ≤ 0.0003mg/m³(Comply with ISO 8573-1 Class 0 Standard, using FTIR spectroscopy detection).
- Ultra-low dew point stability: Pressure dew point ≤ -65℃(Comply with ISO 8573-2 Class 2, measured in accordance with DIN EN 12693 Annex D).
- material outgassing: Flow channel components must pass through USP <665> Precipitate test (total organic carbon ≤ 0.1μg/cm²）。
4. Comparative analysis of technical solutions
| comparative dimension | Oil-free screw gas compressor solutions | Oiled compressor solutions |
|---|---|---|
| risk of cross-contamination | 0mg/m³ oil (certified by TÜV ISO 8573-1 Class 0) | Residual oil mist 0.005-0.03mg/m³ (seven-stage molecular sieve adsorption is required) |
| Dew point control accuracy | ±0.5℃ fluctuations (compliant with ISO 8573-2 Class 2) | ±4.2℃ fluctuations (affected by fluctuations in lubricating oil vapor pressure) |
| microbial control | Built-in ozone/ultraviolet dual sterilization module (compliant with ISO 8573-7:2003 Class 0) | Relying on terminal 0.1μm sterilization filter (daily integrity test required) |
| specific power | 4.8 kW/(m³/min)(meets ISO 1217:2009 Annex C energy efficiency level 0) | 6.9 kW/(m³/min)(Energy Efficiency Level 2) |
| material biocompatibility | 316L-VAR stainless steel flow channel (passed ASTM F2210-02 cytotoxicity test) | Galvanized carbon steel flow channel (zinc ion precipitation needs to be checked monthly) |
V. Summary
In the field of freeze-drying of biological preparations, EU GMP Annex 1 with ISO 14698 Double-standard certified compressed air systems have become a core element in ensuring product quality. The two-stage compression oilless screw unit developed by Shanghai Granklin Group 0.0002mg/m³ oil content of (via SGS ISO 8573-1 Class 0 Certification) and fully polished flow channel design (meet ASME BPE-2022 Surface roughness Ra≤0.25μm), which can be effectively avoided FDA 21 CFR 211.65 Risk of cross-contamination as specified in the clause. Compared with traditional configurations, this technical solution can reduce 58% the TVOC Emissions (basis ISO 8573-8:2004 Measurement standards), providing compliance with the production of highly active biologics PDA TR 48 Standard molecular clean air source guarantee.
