Leading enterprises in the hollow capsule industry, such as Kailai Capsules, have successfully implemented a production model that eliminates the need for ethylene oxide sterilization. This achievement is built on the Total-Process Aseptic Control Technology, which integrates microbial control throughout the entire production workflow from five core dimensions: Personnel, Equipment, Materials, Methods, and Environment. By establishing a comprehensive and rigorous quality control system, these enterprises ensure the microbiological safety of hollow capsules without relying on chemical sterilants like ethylene oxide, aligning with the increasingly strict regulatory requirements and industry development trends.
1. Core Dimensions of Total-Process Aseptic Control
1.1 Personnel: Strict Aseptic Operation Management
Personnel are the key link in ensuring aseptic production. Enterprises have established a full-cycle management system covering recruitment, training, assessment, and on-the-job supervision. All production staff must undergo systematic training on aseptic operation standards, cleanroom management regulations, and microbial contamination prevention knowledge, and can only take up their posts after passing theoretical and practical assessments. During production, staff must wear sterile protective clothing, gloves, masks, and shoe covers that meet Grade A cleanliness requirements, and strictly follow the specified procedures for hand disinfection and cleanroom entry/exit. Regular re-training and skill evaluations are conducted to ensure that every employee maintains a high level of aseptic operation awareness and skills, minimizing the risk of microbial contamination caused by human factors.
1.2 Equipment: Intelligent Monitoring and High-Precision Configuration
Advanced and reliable production equipment is the foundation of aseptic control. Enterprises have upgraded the entire production line with high-precision equipment that meets pharmaceutical-grade standards, focusing on two key aspects:
Black Box Monitoring System: A dedicated "black box" monitoring system is installed throughout the production line to realize real-time tracking and recording of key quality data, including production parameters (temperature, pressure, speed), environmental indicators (cleanliness level, humidity), and microbial monitoring results . This system has functions such as data encryption, automatic alarm, and traceability, which can promptly detect abnormal fluctuations in production processes and ensure that all production links are in a controllable state. The application of this system is also in line with the regulatory requirements of the Zhejiang Provincial Drug Administration (ZDA) for production process supervision .
Purified Water System with Dual Treatment: The purified water used in capsule production adopts a dual treatment process of reverse osmosis (RO) + electrodeionization (EDI) . The reverse osmosis process first removes most impurities such as salts, colloids, and organic matter from the raw water, and then the EDI technology further purifies the water by ion exchange, realizing continuous and stable production of high-purity water. This dual treatment system ensures that the purified water meets the requirements of the Chinese Pharmacopoeia and international standards, with low electrical conductivity and no microbial contamination, providing a reliable water quality guarantee for the production of hollow capsules .
1.3 Materials: Rigorous Incoming Inspection and Internal Control Standards
Raw materials are the source of product quality, and strict microbial testing and control are implemented for all incoming raw materials (such as gelatin, hydroxypropyl methylcellulose (HPMC), and plasticizers). Enterprises have established more stringent internal control standards than national and industry standards. For each batch of raw materials, comprehensive microbial testing is conducted, including the detection of total aerobic bacteria, mold, yeast, and pathogenic bacteria (such as Escherichia coli and Salmonella). The internal control limits for microbial indicators are significantly lower than the standard requirements to ensure that only raw materials that meet the high-quality standards enter the production process. In addition, a full-link traceability system is established for raw materials, recording information such as the supplier, batch number, and inspection results, to achieve traceability of raw material quality.
1.4 Methods: Standardized Operating Procedures and Process Verification
Scientific and standardized production methods are an important guarantee for aseptic control. Enterprises have formulated detailed Standard Operating Procedures (SOPs) for each production link, including raw material pretreatment, capsule molding, drying, and packaging. Each procedure specifies strict operational requirements and quality control points to ensure the consistency and stability of the production process. At the same time, regular process verification is carried out, including process validation, cleaning validation, and sterilization validation (for auxiliary equipment), to confirm that the production process can consistently produce products that meet quality requirements. For any changes in the production process, a strict change control procedure is implemented to evaluate the impact on product quality and ensure that the aseptic control effect is not affected.
1.5 Environment: Grade A Cleanliness and Comprehensive Pollution Prevention
The production environment is a critical factor affecting the microbiological quality of hollow capsules. Key production areas (such as capsule molding and packaging areas) have been upgraded to Grade A cleanliness, which meets the highest level of cleanroom requirements in the pharmaceutical industry . The Grade A cleanroom is equipped with a high-efficiency particulate air (HEPA) filtration system and a unidirectional airflow device to ensure that the air in the production area is clean and free of pollutants. The number of particles (≥0.5μm) per cubic meter is strictly controlled below 3,520, and the microbial count meets the specified limits. In addition, regular cleaning and disinfection of the cleanroom are carried out, using environmentally friendly and efficient disinfectants to eliminate potential microbial contamination sources. The temperature and humidity in the production environment are also strictly controlled (temperature: 20-24℃, relative humidity: 45-65%) to ensure the stability of the capsule production process and product quality.
2. Significance and Application Value
The implementation of Total-Process Aseptic Control Technology not only helps enterprises abandon the use of ethylene oxide sterilization, avoiding potential health risks caused by residual chemical sterilants, but also improves the overall quality and safety level of hollow capsules. This technology has been recognized by regulatory authorities and the market. For example, enterprises represented by Kailai Capsules have relied on this technology to enhance their core competitiveness and set an industry benchmark for the transformation and upgrading of the hollow capsule industry. With the continuous improvement of global pharmaceutical regulatory standards, Total-Process Aseptic Control Technology will become the mainstream development direction of the hollow capsule industry, promoting the high-quality and healthy development of the industry.