Peptide Extraction
Peptide Extraction - Related Videos
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.
03:21
Peptide Purification: An RP-HPLC-based Technique to Extract Peptides from Digested Protein Lysates
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2023
In this video, we demonstrate reversed-phase high-performance liquid chromatography to purify peptides from a digested protein lysate mixture. These purified peptides are then lyophilized and stored for downstream applications. Analysis of peptides can help understand the mechanics involved in cellular signaling and cancer.
04:03
Protein Extraction and Proteolysis: A Method to Obtain Proteins from Prostate Tumor Tissue Samples and their Enzymatic Digestion into Peptides
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2023
This video describes the technique of protein extraction and digestion to obtain peptides from prostate tumor tissue. These peptides on further analysis can help identify novel targets for oncotherapy.
05:43
A STAGE Tip Procedure for Desalting and Purification of Peptides
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2026
Source:Tia Rizakos1, Jennifer Geddes-McAlister11Molecular and Cellular Biology Department, University of Guelph.This video demonstrates peptide purification through the STAGE Tip procedure. A miniature column containing resin beads bonded to long hydrocarbon chains facilitates hydrophobic interaction-based purification. Upon loading a pre-digested peptide sample into the column, the peptide fragments bind to the resin beads, allowing impurities to pass through. An elution buffer that disrupts...
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.
FAQs
Sample disruption releases peptide material from cells or tissues, while an appropriate buffer or solvent helps keep peptides in solution. The extraction conditions must balance solubilization with preservation of the target molecules. This first stage matters because incomplete disruption or poor solubilization can reduce recovery before cleanup and downstream analysis.
Cleanup methods impose different separation principles. Precipitation and centrifugation remove proteins and other particulate or insoluble material, whereas solid-phase extraction selectively retains and releases analytes during a more targeted cleanup. Chromatography offers an additional separation step. Choosing among them depends on the sample and desired purity, because contaminant removal directly affects peptide recovery and the quality of subsequent measurements.
Reversed-phase high-performance liquid chromatography separates peptides according to hydrophobicity, so peptides with different chemical properties can be resolved before analysis. This added fractionation can reduce sample complexity and present cleaner peptide-containing fractions to mass spectrometry or biochemical testing. Its value is therefore not merely separation: it can improve the analytical sensitivity and interpretability of measurements made after extraction.
A practical workflow begins by disrupting the biological sample, adding a compatible buffer or solvent, and separating soluble material from unwanted components. Researchers may then apply precipitation, centrifugation, solid-phase extraction, or chromatography, followed when needed by reversed-phase HPLC. The cleaned or fractionated material is finally directed to mass spectrometry or biochemical testing, depending on the experimental objective.
Researchers select this approach when they need to examine peptide populations from cells, tissues, biological fluids, or protein digests. In proteomics, the resulting material supports peptide identification; in biomarker discovery, it helps prepare samples for comparative analysis. The same strategy also serves studies of signaling and antimicrobial peptides, as well as characterization of therapeutic molecules.
A useful preparation retains enough target peptide for detection while removing substances that interfere with measurement. Greater sample purity can improve analytical sensitivity, whereas poor recovery may hide biologically important peptides. Assessing both outcomes helps determine whether the extraction and cleanup sequence is suitable for mass spectrometry, biochemical testing, or downstream biological interpretation.