What is Downstream Processing? Key Concepts and Best Practices
Downstream processing refers to the series of operations required to extract a pure and homogenous protein product from biological materials by incrementally increasing the purity through various physical and chemical methods.
Today, operators in the biotechnology, chemical, and pharmaceutical industries are prioritising downstream processing equipment for support in achieving consistent particle size and consistent final product quality. Factors that are affecting operators include the handling of hazardous, toxic, and sensitive materials in a safe environment and shortening the production cycles whilst reducing the facility’s carbon footprint.
Research from Chemical Engineering Science, 2021, further supports this operator incentive: “Continuous downstream bioprocessing argues that intensified, integrated downstream trains can shorten production cycles, reduce facility footprint, enhance equipment utilisation, and cut overall costs while maintaining consistent product quality.”
Whether operators are in the pharmaceutical, biotechnology or chemical industries, decision-making around downstream processing remains crucial.
In this article, we aim to explain the key concepts, best practices, and processes for downstream processing and how implementing these can support you in your decision-making.
What Are the Foundational Concepts of Downstream Processing
Downstream processing focuses on transforming immediate materials into finished, specification-ready products. The key foundational concepts of downstream processing include:
Separation & Purification
Separation and purification isolate the desired product from alternative impurities, by-products, solvents, or cells after production. This process achieves the required purity and yield, whilst maintaining product stability and activity.
Common operations feature solid-liquid separation, liquid-liquid separation and purification techniques such as crystallisation and ion exchange chromatography.
Particle Size Reduction & Conditioning
Particle size reduction and conditioning support the achievement of uniform particle size and physical properties suitable for downstream formulation and handling. This process improves the solubility, dissolution, or bioavailability to enhance flowability and compressibility.
Common techniques for particle size reduction and conditioning include:
- Milling
- Grinding
- Sieving and classification
- Granulation (wet or dry)
Drying & Moisture Control
Moisture control and drying remove the excess moisture for product stability, shelf life, and ease of handling. This foundational concept prevents microbial growth, improves the storage stability and achieves the target moisture content.
Common drying methods include:
- Tray drying
- Spray drying
- Vacuum drying
Mixing & Homogenisation
Homogenisation and mixing ensure the uniform distribution of components within a product. This concept supports the consistent product quality, prevents segregation, and improves the functional performance. Common operations include the likes of powder mixing and high pressure homogenisation.
Process Optimisation & Scalability
Scalability and process optimisation improve efficiency, reduce costs, and enable the transition from lab to industrial scale. This process maximises yield and purity, reduces processing time and waste, and supports consistent quality at larger scales.
But how do these foundational concepts address the key common challenges?
What Challenges Does Downstream Processing Address?
By understanding the key challenges of downstream processing, operators can maximise the efficiency and output of their production. Whether it’s achieving consistent particle size and product quality, scaling processes from R&D to full-scale manufacturing, or integrating multiple downstream steps efficiently, modern downstream processing solutions are designed to fit seamlessly into your production while managing these core complexities.
But what solutions does down streaming address?
- Achieve consistent particle size & product quality
- Yield loss during purification or powder handling
- Handle hazardous, toxic, or sensitive materials safely
- Scale processes from R&D to full production
- Integrate multiple downstream steps efficiently
- Meet increasingly strict regulatory requirements
Downstream Processing: Industry Best Practices
To ensure that your downstream processing is appropriate and addresses the challenges for operators and maintenance personnel. Ensure that your chosen solutions have been designed for purity and yield, keep to robust clarification strategies, and put scalability and manufacturability first.
Design for Purity & Yield
When designing for downstream processing, ensure that the balance of solutions is high recovery with high purity. To ensure that purity and yield are prioritised, choose downstream processing solutions that remove multiple impurities at once when possible.
Robust Clarification Strategies
Depth filtration and centrifugation are traditional best practices, with movement towards single-use clarification systems.
Scalability & Manufacturability First
Use equipment that can be scaled linearly with operations with wide operating ranges.
Single-Use & Closed Systems
With industry shifts towards disposable filters and tubing, and closed processing that reduces contamination risks. Opting for single-use and closed systems allows for faster changeovers, lower cleaning validation burdens and reduced cross-contamination risks.
Regulatory Alignment & Documentation
Downstream processes must comply with the most recent regulatory compliance standards.
Hosokawa Solutions
Trust Hoskawa for your downstream processing solutions. With decades of expertise in powder and particle processing, our global installations can be installed across pharmaceuticals, biotechnology, chemical, and food industries.
Plus, we have a proven ability to support customers from lab-scale development through to full production. Discover our full range of size reduction solutions.
Choose Hosokawa for Your Downstream Processing
Hosokawa downstream processing solutions support the handling of hazardous, toxic, and sensitive materials whilst integrating multiple downstream steps efficiently and meeting strict regulatory requirements.
Are you ready to discover what’s possible with Hosokawa downstream processing solutions? Explore size reduction solutions, or speak to our expert team today.
