Pd 10 Desalting Column
Pd 10 Desalting Column - Related Videos
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...
09:15
Column Chromatography - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Column Chromatography of Food DyeExpand In this experiment, you'll use column chromatography to separate green food coloring into its component blue and yellow dyes, called erioglaucine and tartrazine. First, you'll use 95% ethanol to elute the dye with a weaker affinity for silica gel. Then, you'll flush the second dye from the column with water. To recover the purified dyes, you will collect each...
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
Column Chromatography - Concepts
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2020
Column Chromatography Multiple techniques exist to purify and separate compounds in an organic chemistry laboratory. One of the most reliable separation techniques for microscale separations, where less than 10 grams of the compound is available for analysis, is column chromatography. This technique separates compounds in a mixture based on their physical properties, such as their solubility, polarity, hydrophobicity, size, and charge. Chromatography Basics The main components of any...
02:50
Column Chromatography - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of the Dye SolutionExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. Before you get started, put on a lab coat, safety glasses, and nitrile gloves, and make sure that the lab has a labeled organic waste container. Prepare 5 mL of green food dye solution in ethanol. First, tare a clean empty 5-mL volumetric...
FAQs
Sephadex G-25 contains pores that admit small molecules but largely exclude larger proteins. Protein molecules therefore travel through the column without entering most of the pore volume, while salts and other small compounds spend more time inside the matrix. This difference in accessible volume produces size-based separation and allows protein-containing fractions to emerge before the smaller contaminants.
The elution order reflects molecular access to the gel rather than a chemical interaction with the sample. Proteins larger than the relevant pores move through the column’s external space, whereas salts enter the pores and follow a longer effective path. As a result, early fractions are enriched in protein, while later material contains more of the small-molecule components.
The process removes salts and related small molecules through physical size separation, rather than requiring conditions that substantially alter the protein. The overview describes it as rapid and gentle, with little substantial dilution or denaturation. Those characteristics are important when the recovered protein must remain suitable for biochemical assays, electrophoresis, labeling, or later purification.
The workflow consists of passing the protein sample through the prepacked column and collecting the protein-containing eluate separately from the later small-molecule material. Separation occurs as the sample moves through the Sephadex G-25 matrix, so the collected fractions can be used when the protein has entered the desired buffer and interfering salts have been reduced.
Researchers would use it when salts or other small molecules could interfere with a downstream experiment, or when the protein must be placed in a defined buffer. This preparation is relevant before biochemical assays, electrophoresis, labeling reactions, and purification steps that require controlled buffer conditions. The method therefore links sample cleanup with experimental compatibility.
Desalting can produce a protein sample with reduced concentrations of interfering salts and other small compounds while preserving a suitable buffer environment. In biology research, that outcome supports more reliable downstream analysis and reactions. Its value is especially clear when assay performance, electrophoretic behavior, labeling chemistry, or subsequent purification depends on defined solution conditions.