Characterize the culture broth
Assess cell density, viability, turbidity, and the effects of delays in harvesting.
Biopharma · APPLICATION GUIDE
Harvest & Clarification
Manage target product recovery and the load on downstream processes while reducing cells and cell debris.
Review selection pointsDiscuss this applicationFIELD APPLICATION & FLOW
See the application in its industrial setting.
Review product locations and fluid paths.
APPLICATION IN CONTEXT
- Culture vessel
- Transfer pump
- Depth-filter rack
- Polishing filter
- Clarified-harvest collection
Connections to review
- 01 → 02 Culture vessel → Transfer pump
- 02 → 03 Transfer pump → Depth-filter rack
- 03 → 04 Depth-filter rack → Polishing filter
- 04 → 05 Polishing filter → Clarified-harvest collection
Evaluate particle removal and product recovery together. Clarification alone does not guarantee soluble-impurity removal.
A conceptual illustration created to explain equipment and application locations. It is not an actual product photograph, installation photograph or piping/wiring design.
Connection principles and operating/test methods
Bulk removal and the role of depth filtration
Fluid
Scroll horizontally to see the complete flow.
Consider centrifugation, filtration, or other methods for primary clarification. Compare impurity reduction by the depth medium with adsorption of the target product.
These conceptual views explain flow direction. Actual piping, wiring and physical flow rates require a separate design.
01 — PROCESS
Where does each step fit?
Define the intended use and conditions to identify the required role of each item.
Bulk solids removal and depth filtration
Compare combinations of centrifugation and staged depth filtration.
Protect downstream processes
Evaluate fine particles, quality, and recovery before the fluid enters purification.
02 — SELECTION
What should be selected and verified?
Changes in cell density and viability in the culture broth can change the capacity of the same filter. Assess not only the turbidity of the clarified fluid but also target product recovery, HCP and DNA levels, and the impact on downstream processes.
Scroll horizontally to review all columns.
| Process objective | Step to review | Selection evidence |
|---|---|---|
| Initial solids load | Harvest and primary clarification | Cell density, viability, and batch variability |
| Fine debris | Depth filtration / polishing | Turbidity, particle size, differential pressure, and capacity per unit area |
| Impurities | Adsorption characteristics of each medium | HCP and DNA reduction, and target protein loss through adsorption |
| Scale-up | Representative scale-down model | The same feed, filtrate flux, and loading conditions, plus liquid remaining in the piping |
These examples start the application review. Pore size or nominal rating alone does not establish suitability or retention; confirm with the actual process fluid and supplier evidence.
03 — OPERATING CHECKS
Use operating data to identify improvements.
Do not assess performance by turbidity alone
Even clear filtrate may contain soluble impurities and may be associated with product loss. Evaluate recovery together with impurity analyses.
Include worst-case batches
Compare filters using feed that reflects actual variability, such as high cell density and low viability.
Allow a margin when sizing the filter area
Account for variability and process endpoint criteria rather than directly scaling up the maximum capacity from a single small-scale test.
04 — QUESTIONS
Frequently asked questions
Do pretreatment filters remove all HCP and DNA?
The contributions of particle removal and adsorption depend on the medium, feed, pH, and conductivity. Confirm them analytically and define their roles alongside downstream purification.
Can results for proteins be applied to viral vectors?
Vectors differ in adsorption behavior and losses of structure and activity, so separate assessments of recovery and function are required.
05 — APPLICATION REVIEW
Prepare the conditions for a technical discussion.
These details help narrow the configuration and the evidence to review.
- Culture platform and target product
- Batch volume, cell density, and viability
- Current clarification configuration and processing time
- Turbidity, HCP, DNA, and recovery
- Differential pressure, flow rate, and replacement criteria