Membrane Sterilization Technology for Biological Liquid Aseptic Filtration

Biological fermentation liquids, traditional Chinese medicine extracts, functional beverages and pharmaceutical intermediates contain a certain number of bacteria, yeast and microbial spores after conventional filtration. These tiny microorganisms cannot be completely removed by centrifugation or coarse filtration. During storage and filling, residual microbes will continue to reproduce, causing liquid turbidity, precipitation, acid deterioration and microbial exceeding standards, which seriously affects product safety and commercial shelf life.

Traditional sterilization methods have unavoidable technical defects. High‑temperature instantaneous sterilization and boiling sterilization will denature proteins, oxidize polyphenols and destroy heat‑sensitive active substances, resulting in reduced efficacy, darkened color and decreased product yield. Ultraviolet and ozone sterilization have uneven treatment effect and poor penetration. Chemical sterilization brings residual hazards and cannot be used in food and pharmaceutical grade production. These limitations make traditional sterilization difficult to meet high-end aseptic production requirements.

Membrane aseptic filtration technology completely changes the traditional sterilization mode. Adopting micro‑pore precision membrane elements with fixed pore size, the system accurately intercepts all microorganisms such as bacteria, yeast and spores, while allowing small‑molecule active ingredients and solvent molecules to pass through smoothly. The entire sterilization process is carried out at room temperature and pressure with pure physical separation, no heating and no additives, fully retaining the original activity, flavor and nutritional characteristics of the material liquid.

Different from ordinary clarification filtration, membrane sterile filtration adopts absolute precision screening. The membrane pore structure is uniform and stable, which can achieve thorough microbial removal and reach industrial aseptic standards. The cross‑flow operation mode avoids impurity accumulation and membrane surface blockage, ensuring continuous and stable sterile filtration effect. After sterile membrane treatment, the liquid has zero bacteria, high clarity and stable quality, which greatly improves product safety and storage stability.

In formal industrial production, membrane sterilization is used as the final terminal aseptic process before product filling. After pretreatment clarification and fine filtration, the material liquid enters the sterile membrane system for final microbial removal, effectively avoiding secondary contamination in the production process. The system is equipped with complete online flushing and CIP sterilization functions, which can eliminate residual bacteria and dirt inside the pipeline and membrane pores to ensure the sterility of each batch of production.

The fully automatic membrane sterile system features simple process, low energy consumption and high sterilization efficiency. It avoids material loss and quality degradation caused by traditional sterilization, significantly improving product grade and economic benefits. The modular design is easy to integrate into new and existing production lines, meeting GMP production standards for pharmaceuticals, biological products and high‑end food.

With the continuous upgrading of food safety and pharmaceutical sanitation standards, low-temperature physical sterilization has become an inevitable trend in the industry. Membrane aseptic filtration technology provides a safe, efficient and reliable sterile processing solution for modern biological refining and liquid production, and has become an indispensable core process in high-standard clean production systems.