B-phycoerythrin Purification via Isoelectric Precipitation and Two-Aqueous-Phase Systems
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Solution Overview
Problem
Current methods for recovering and purifying B-phycoerythrin from Porphyridium cruentum are complex, costly, and not scalable for industrial use due to the large number of chromatographic steps required, leading to high operating and maintenance costs and low yields.
Innovation Solution
A process combining isoelectric precipitation and two-aqueous-phase systems, specifically using polyethylene glycol (PEG) and potassium phosphate, to recover and purify B-phycoerythrin, which simplifies the process, reduces costs, and achieves high purity suitable for industrial scale applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chromatographic methods are used for B-phycoerythrin purification, then high purity is achieved, but process complexity and operating costs increase significantly
Solution Approach 1:
The patent applies parameter changes by adjusting pH to the isoelectric point of B-phycoerythrin (pH 4.2-4.4) to induce precipitation, and by modifying solvent composition in two-aqueous-phase systems (using PEG and potassium phosphate with specific concentrations) to achieve purification. This replaces complex chromatographic procedures with simpler parameter-based separation methods while maintaining high purity levels.
2Manufacturing precision
If multiple chromatographic steps are employed, then purification quality improves, but productivity and scalability deteriorate
Solution Approach 1:
The patent merges multiple separation functions into a unified two-aqueous-phase system that combines precipitation and liquid-liquid extraction in one operational framework. This integration eliminates the need for sequential chromatographic steps, thereby improving productivity and enabling industrial-scale production while maintaining purification quality.
3Manufacturing precision
If conventional purification protocols are used, then high purity is obtained, but process costs and operational time increase
Solution Approach 1:
The patent utilizes phase transitions by inducing isoelectric precipitation where B-phycoerythrin transitions from dissolved state to solid precipitate at its isoelectric pH, and by employing two-aqueous-phase systems where the protein partitions between two liquid phases. These phase transition-based methods achieve rapid purification without the time-consuming sequential steps of conventional chromatography.
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
The process achieves high purity of B-phycoerythrin (>4 Abs 545 nm/280 nm) with reduced operational costs and increased scalability, making it suitable for industrial applications, particularly in molecular biology.
Implementation Method 1
a step comprising a two-aqueous-phase separation system comprising a polymer-containing aqueous phase and a salt-containing aqueous phase
Implementation Method 2
an isoelectric precipitation step
Data Source
AI summary
This invention focuses on a novel process in which Porphyridium cruentum biomass first undergoes a stage of cellular disruption and subsequently stages of recovery and purification in order to achieve the purified B-phycoerythin (BFE) protein dye, using isoelectric precipitation and two-aqueous-phase systems. The steps of recovery and purification include isoelectric precipitation followed by a step of liquid/liquid extraction by means of two-aqueous-phase systems that use polyethylene glycol (PEG) and phosphate salts. The BFE protein dye obtained in the two-aqueous-phase extraction step undergoes an ultrafiltration step in order to remove the polymer (PEG) and to obtain a dye with a purity greater than 4.0 defined as the relationship between the absorbencies at 545 and 280 nm (BFE purity=Abs 545 nm/Abs 280 nm).