Hydroxyapatite Chromatography
Hydroxyapatite Chromatography - Related Videos
13:46
Separation of Single-stranded DNA, Double-stranded DNA and RNA from an Environmental Viral Community Using Hydroxyapatite Chromatography
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Cited by 5 •
2011
We describe an efficient method to separate single-stranded DNA, double-stranded DNA and RNA molecules from environmental viral communities. Nucleic acids are fractionated using hydroxyapatite chromatography with increasing concentrations of phosphate-containing buffers. This method permits the isolation of all viral nucleic acid types from environmental samples.
05:41
Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Cited by 18 •
2017
This paper describes a novel method for the rapid manufacture of high quality bioinspired nanoscale hydroxyapatite. This biomaterial is of great significance in the manufacture of a wide range of innovative medical devices for clinical applications in orthopedics, craniofacial surgery and dentistry.
08:52
Ion-Exchange Chromatography
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Ion-exchange chromatography is a type of chromatography that separates analytes based on charge. A column is used that is filled with a charged stationary phase on a solid support, called an ion-exchange resin. Strong cation-exchange chromatography preferentially separates out cations by using a negatively-charged resin while strong anion-exchange chromatography preferentially selects out anions by using a positively-charged...
09:23
Column Chromatography
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2023
Source: Laboratory of Dr. Jimmy Franco - Merrimack College Column chromatography is one of the most useful techniques for purifying compounds. This technique utilizes a stationary phase, which is packed in a column, and a mobile phase that passes through the column. This technique exploits the differences in polarity between compounds, allowing the molecules to be facilely separated.1 The two most common stationary phases for column chromatography are silica gel (SiO2) and alumina (Al2O3), with...
03:07
Thin-Layer Chromatography - Concepts
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2020
Chromatography Chromatography is a technique used in organic chemistry to separate compounds in a mixture based on their differences in solubility between two different phases. The concept is similar to liquid-liquid extraction, except in chromatography, the two phases consist of the stationary phase and the mobile phase. The stationary phase is a solid — typically a microscale hydrogel bead — while the mobile phase is a carrier solvent. In traditional chromatography, the stationary phase is...
FAQs
Selectivity comes from complementary interactions between functional groups on an analyte and the two chemically distinct site types in the hydroxyapatite crystal. Calcium sites and phosphate sites can contribute differently to retention, so molecules with similar overall properties may still interact unequally with the stationary phase. This mixed interaction pattern helps resolve closely related biomolecules, including protein isoforms.
Changing pH, buffer composition, or phosphate concentration alters the strength and balance of analyte interactions with hydroxyapatite. As these conditions change, retained molecules elute at different points, providing control over separation selectivity. In practice, adjusting phosphate concentration is especially useful for modifying elution behavior, while pH changes can further influence how charged functional groups interact with the calcium phosphate surface.
Unlike size-exclusion chromatography, which separates according to molecular size, and conventional ion-exchange chromatography, which emphasizes ionic interactions, hydroxyapatite provides mixed-mode selectivity through both calcium and phosphate sites. Consequently, it can distinguish molecules that remain poorly resolved by either approach alone. This makes the technique useful when related proteins or other charged compounds require an additional separation dimension.
The method is suited to proteins, nucleic acids, and other charged compounds whose functional groups can interact with the calcium phosphate stationary phase. Its value is greatest when a sample contains molecules with similar properties but different interaction patterns, such as protein isoforms. Separations can support both characterization and purification, allowing researchers to examine composition while obtaining more selectively resolved fractions.
Researchers can vary buffer composition, pH, and phosphate concentration to control how strongly analytes interact with the stationary phase. A separation may therefore be tuned by changing these conditions rather than relying on a fixed interaction pattern. This approach helps optimize resolution between closely related components and can improve the usefulness of the resulting chromatographic profile for characterization or purification.
Hydroxyapatite separations can reveal differences among closely related biomolecules, help resolve protein isoforms, and contribute to purity assessment. Under suitable conditions, the method can also preserve biological activity, which is important when purified material must remain suitable for subsequent biochemical study. In chemistry-focused research, these outcomes connect molecular interactions at the stationary phase with practical analysis of complex biomolecular samples.