Peptide Separation
Peptide Separation - Related Videos
04:50
Phosphopeptide Enrichment: An Antibody-based Immunoprecipitation Technique to Separate Specific Phosphorylated Peptides from Complex Peptide Mixtures
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2023
In this video, we demonstrate antibody-based immunoprecipitation of phosphopeptides from a peptide mixture. The enriched phosphopeptides are vacuum concentrated and stored for downstream analysis.
11:05
Capillary Electrophoresis to Monitor Peptide Grafting onto Chitosan Films in Real Time
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Cited by 1 •
2016
Free solution capillary electrophoresis is a fast, cheap and robust analytical method that enables the quantitative monitoring of chemical reactions in real time. Its utility for rapid, convenient and precise analysis is demonstrated here through analysis of covalent peptide grafting onto chitosan films for improved cell adhesion.
04:00
Immunoaffinity Based Extraction of Ubiquitinylated Peptides: A Technique to Selectively Extract Ubiquitin Tagged Peptides from Purified Peptide Fractions
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2023
This video describes a method to extract and purify ubiquitinylated peptides containing remnant di-glycine peptides from a complex peptide mixture. The presented method may help in identifying original ubiquitination sites in the protein.
12:27
Measuring Peptide Translocation into Large Unilamellar Vesicles
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Cited by 9 •
2012
This protocol details a method for the quantitative measure of peptide translocation into large unilamellar lipid vesicles. This method also provides information about the rate of membrane translocation and can be used to identify peptides that efficiently and spontaneously cross lipid bilayers.
07:26
Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Cited by 6 •
2013
This paper describes the formation of highly ordered peptide-based structures by the spontaneous process of self-assembly. The method utilizes commercially available peptides and common lab equipment. This technique can be applied to a large variety of peptides and may lead to the discovery of new peptide-based assemblies.
FAQs
Reversed-phase chromatography separates peptides according to hydrophobicity, or differences in how they interact with stationary and mobile phases. Peptides with different hydrophobic properties therefore move through the system differently and can emerge as separate fractions. This resolution can help isolate neuropeptides or peptide neurotransmitters from a biological sample before identification and characterization.
Ion-exchange chromatography exploits differences in net charge. Because peptides with different net charges interact differently with the stationary and mobile phases, members of a mixture can be resolved into distinct fractions. This property-based separation complements reversed-phase chromatography, which emphasizes hydrophobicity, and provides an alternative route for analyzing signaling peptides in neuroscience samples.
Size-exclusion chromatography separates components according to molecular size as they interact with stationary and mobile phases. It is useful when peptide mixtures contain fragments or other components that differ in size, rather than primarily in hydrophobicity or net charge. Comparing this approach with reversed-phase and ion-exchange methods helps match the separation strategy to the property most useful for analysis.
Resolving a mixture into individual or defined peptide fractions reduces the complexity presented to downstream analyses. Better-separated material can improve the ability of mass spectrometry, sequencing, and quantitative methods to characterize peptide components. In neuroscience, that analytical clarity supports investigation of neuropeptides, peptide neurotransmitters, and protein fragments, including molecular changes associated with neurological disorders.
A basic workflow applies an appropriate chromatographic mode to a biological sample, collects separated fractions, and directs those fractions to characterization or measurement. The selected mode can target hydrophobicity, net charge, or molecular size. Fractionation before mass spectrometry, sequencing, or quantitative analysis makes it possible to examine peptide components individually or as defined groups.
In neuroscience, peptide separation supports studies of neuronal communication and brain signaling pathways by making relevant molecular components more accessible to analysis. It can be applied to neuropeptides, peptide neurotransmitters, and protein fragments present in biological samples. Comparing separated fractions also helps researchers examine molecular changes linked with neurological disorders.