Volumetric Power Input for Virus Yield in Cell Culture

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Solution Overview

Problem

Traditional egg-based systems for viral vaccine production are vulnerable due to varying biological quality and logistical issues, and cell culture systems face challenges in achieving high virus yields, particularly in large-scale production and purification processes.

Innovation Solution

A method involving increased volumetric power input during cell culture, specifically between 30 W/m³ and 120 W/m³, to enhance cell density and improve virus yield, combined with microfiltration and sucrose gradient ultracentrifugation for purification, which increases virus recovery and consistency without harming cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If cell culture systems are used for virus production, then flexibility and consistency are improved, but virus yield is insufficient

Engineering Contradiction:

ImproveflexibilityVSAvoidvirus yield

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by increasing the volumetric power input from conventional levels to 30-120 W/m³ during cell culture. This parameter modification transforms the cell culture system to achieve both high flexibility/adaptability and high virus yield, resolving the contradiction between these two features.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If purification steps are increased to improve virus purity, then virus recovery is improved, but virus material loss increases

Engineering Contradiction:

Improvevirus purityVSAvoidvirus material loss

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent modifies the volumetric power input parameter during cell culture to 30-120 W/m³, which produces virus with characteristics that enable high recovery rates through standard purification steps. This parameter change allows achieving both high virus purity and minimal material loss simultaneously.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach significantly enhances virus yield and recovery during purification, allowing for more consistent and efficient large-scale production of viral vaccines, doubling the load capacity of sucrose gradient ultracentrifugation and maintaining cell integrity.

Implementation Method 1

a volumetric power input of 30 W/m³ to 120 W/m³ is applied to the cell culture

Methodology Applied

Scientific EffectVolumetric power input:

Implementation Method 2

microfiltration and sucrose gradient ultracentrifugation for purification

Methodology Applied

Scientific EffectMicrofiltration: Filter (physical)

Implementation Method 3

sucrose gradient ultracentrifugation for purification

Methodology Applied

Scientific EffectUltracentrifugation: Centrifugal Separation

Implementation Method 4

sucrose gradient ultracentrifugation

Methodology Applied

Scientific EffectDensity gradient: Density Gradient

Data Source

PatentEP3039127B1Large scale production of viruses in cell culture

Publication Date: 2020.01.01 GLAXOSMITHKLINE BIOLOGICALS SA

AI summary

A method of producing a virus in cell culture comprising at least the steps of a) providing a population of cells cultured in a cell culture medium, b) infecting the population of cells by i. inoculating the population with the virus, and ii. incubating the inoculated population so as to allow the virus to replicate and propagate, c) collecting the produced virus, thereby providing a viral harvest, and d) purifying the virus, wherein a power density of at least 15 W/m3, at least 30 W/m3, at least 60 W/m3, at least 100 W/m3, at least 120 W/m3 is applied to the cell culture at least during step b).