Ceramic Hydroxyapatite Phosphopeptide Enrichment
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Solution Overview
Problem
Current methods for enriching phosphorylated peptides, such as immobilized metal chelate affinity chromatography, face challenges like non-selectivity due to interactions with non-phosphorylated species and incomplete elution, making high yield and purity elusive.
Innovation Solution
Chromatographic fractionation using ceramic hydroxyapatite allows for selective extraction and enrichment of phosphorylated peptides from mixtures with non-phosphorylated species, enabling high throughput and high purity separations, including differentiation between mono- and multi-phosphorylated species, without additional supports that can cause non-specific binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If immobilized metal chelate affinity chromatography (IMAC) is used to enrich phosphopeptides, then phosphopeptide enrichment is achieved, but selectivity is reduced due to interactions with non-phosphorylated species
Solution Approach 1:
The invention changes the chromatographic parameters by using ceramic hydroxyapatite with specific calcium ion concentrations and pH conditions (pH 2.0-3.0 for loading, pH 7.0-9.0 for elution) to achieve selective phosphopeptide enrichment without the non-specific binding problems of IMAC
Solution Approach 2:
The invention uses calcium ions as an intermediary on the ceramic hydroxyapatite surface to mediate the interaction with phosphopeptides, allowing selective binding through calcium-phosphate complexes while avoiding direct metal-phosphate interactions that cause non-specific binding
2Quantity of substance
If immobilized metal chelate affinity chromatography (IMAC) is used to enrich phosphopeptides, then phosphopeptide isolation is achieved, but elution efficiency is reduced
Solution Approach 1:
The invention uses periodic elution with stepwise pH changes (first at pH 7.0-9.0, then at higher pH) to achieve complete and efficient phosphopeptide elution in multiple stages, ensuring quantitative recovery
Solution Approach 2:
The invention changes the elution parameter by using pH adjustment rather than competitive ligands, allowing efficient and complete elution of phosphopeptides from the ceramic hydroxyapatite matrix
3Strength
If additional supports are used in chromatographic media, then structural stability is improved, but non-specific binding increases
Solution Approach 1:
The invention uses self-supporting ceramic hydroxyapatite beads that provide their own structural stability through the rigid ceramic matrix, eliminating the need for additional organic supports that would cause non-specific binding
Solution Approach 2:
The invention uses porous ceramic hydroxyapatite beads with controlled pore structures that provide mechanical strength while maintaining surface availability for specific phosphopeptide binding without requiring external support matrices
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 method achieves high yield and purity in phosphopeptide enrichment, suitable for small sample volumes and high-pressure applications, with ceramic hydroxyapatite's self-supporting nature reducing non-specific binding and enabling efficient separation of phosphorylated peptides from complex mixtures.
Implementation Method 1
chromatographic fractionation of the mixtures over ceramic hydroxyapatite
Implementation Method 2
selective extraction and enrichment of phosphorylated peptides from mixtures with non-phosphorylated species
Data Source
AI summary
Phosphorylated peptides are extracted from digests of biological liquids and other peptide mixtures by fractionation on ceramic hydroxyapatite. The ceramic hydroxyapatite is readily usable in a centrifuge, allowing for rapid fractionations of a large number of small volume samples, and accordingly high throughput.