Jinan Zhuocheng Bio-Tech Co., Ltd.

Active pharmaceutical ingredients (APIs) are the prerequisite for the production of drug formulations. Within every segment of the pharmaceutical industrial chain, APIs serve as the fundamental raw materials of the pharmaceutical manufacturing industry, and their production is largely carried out through outsourcing models. API contract manufacturing and process services refer to pharmaceutical companies entrusting specialized R&D institutions to conduct process development and manufacturing of APIs. The production processes of APIs mainly include chemical synthesis, fermentation, and plant/animal extraction.

By source, APIs are generally classified into chemically synthesized APIs, plant- and animal-derived APIs, and fermentation- or cell culture-derived APIs. By microbiological control level and final dosage application, APIs can also be divided into non-sterile APIs and sterile APIs. Typical API manufacturing processes are as follows:

1. Chemical synthesis API manufacturing process
   Chemical synthesis APIs refer to products in which various chemical raw materials undergo specific chemical reactions under industrial conditions to generate active pharmaceutical compounds. These compounds are then purified through crystallization, filtration, drying, and other downstream processes to meet pharmaceutical quality standards and specifications.
2. Fermentation-based API manufacturing process
   Fermentation is one of the key production routes for APIs, particularly for antibiotic APIs such as penicillins and cephalosporins, which are typically produced through semi-synthetic processes combining fermentation and chemical synthesis. First, microbial fermentation is used to obtain the core structure of the target compound, such as the β-lactam backbone of penicillin. Structural modification is then performed to obtain the final active molecule, followed by purification and recrystallization to achieve the final API product. The fermentation process generally involves media preparation, sterilization, inoculation, fermentation, cell disruption, filtration, precipitation, centrifugation, and drying.
3. Sterile API manufacturing process
   Similar to sterile finished dosage forms, sterile APIs can be classified into terminally sterilized APIs and aseptically processed (non-terminally sterilized) APIs. However, due to the sensitivity of most APIs to high temperature, high pressure, humidity, and radiation, terminal sterilization is rarely used. Currently, non-terminal sterile APIs are typically produced by combining the final purification or salt formation step with sterilization techniques, using pre-filtration followed by two-stage 0.22 μm sterile filtration to ensure sterility. The filtrate is then processed through crystallization, lyophilization, or spray drying to obtain the final sterile API product. Compared with non-sterile APIs, sterile APIs not only require control of impurities and physicochemical properties but also demand sterility assurance from the early stages of process design. Therefore, they impose higher requirements on manufacturing environment and equipment.
4. Plant- and animal-derived API manufacturing process
   Nature is a vast reservoir of natural compounds. Through their metabolic processes, plants and animals produce numerous bioactive molecules that are difficult to synthesize artificially but have significant therapeutic value. As a result, extraction from plant and animal sources remains an important route for obtaining target compounds and a key method for API production.

Many pharmaceutical R&D organizations provide API contract process services, ensuring that processes operating within predefined parameters can continuously and effectively produce drugs that meet specified quality standards and specifications. In API process development and manufacturing, strict adherence to Good Manufacturing Practice (GMP) is also required. Pharmaceutical quality is built into the manufacturing process itself rather than solely relying on testing. Therefore, production management must be fully implemented in accordance with GMP standards.