How does gel filtration chromatography work?

Gel filtration (GF) chromatography separates proteins solely on the basis of molecular size. Separation is achieved using a porous matrix to which the molecules, for steric reasons, have different degrees of access–i.e., smaller molecules have greater access and larger molecules are excluded from the matrix.

Why is blue dextran used in gel filtration chromatography?

Blue dextran: It is too large and can’t get into the beads and therefore excluded from the gel (Kd=0), and pass the column in the void volume (space between gel beads). Blue dextran is often used as a marker to measured void volume.

What are the steps of gel filtration?

Steps in Gel Filtration Chromatography The sample is applied to the column. Buffer (mobile phase) and sample move through the column. Molecules diffuse in and out of the pores of the matrix (also described as the partitioning of the sample between the mobile phase and the stationary phase).

Which method is most suitable for fractionation of dextran?

Method for the Fractionation of Dextran by Centrifugal Precipitation Chromatography.

Which compounds elute first in gel chromatography?

Size exclusion chromatography is called gel filtration chromatography because the gel essentially allows for the filtering of molecules from a sample based upon molecular size. However, unlike other techniques, the larger molecules elute first.

What is the significance of using blue dextran in molecular exclusion chromatography when is it used and why?

Blue dextran is also used for checking the column packing. A symmetrical peak of elution indicates homogeneity of packing. The inner volume (Vi) of the column can be determined by subtracting the void volume from the elution volume of small molecules such as glucose or tyrosine having K d — 1.0.

What is blue dextran?

Blue Dextran is a high-molecular-weight glucose polymer (original mol wt 2 x 10(6) g/mol) containing covalently bonded Reactive Blue 2 dye (approximately mmol/g dextran). This blue dye is known for its high binding affinity to a wide variety of proteins, with a particularly high affinity for serum albumin.

What are the types of gel filtration chromatography?

Applications of Gel-Filtration Chromatography

  • Separation of Proteins and Peptides.
  • Size-Exclusion Reaction Chromatography: Protein PEGylation.
  • Separation of Nucleic Acids and Nucleotides.
  • Virus Particles.
  • Endotoxin Removal.
  • Absolute Size-Exclusion Chromato-graphy (ASEC)
  • Molecular Mass Estimation.
  • Group Separations.

Which stationary phase is used in gel filtration chromatography?

porous beads
In gel filtration chromatography, the stationary phase is comprised of porous beads packed into a column. The mobile phase is the running buffer or other solvent. Sample components partition between the stationary and mobile phases based on their size-based accessibility to the pores of the matrix beads.

What is gel chromatography?

gel chromatography, also called Gel Filtration, in analytical chemistry, technique for separating chemical substances by exploiting the differences in the rates at which they pass through a bed of a porous, semisolid substance.

How do you dissolve dextran?

Dextran fractions are freely soluble in water. To hasten dissolution of dextran powders, the powder should be added portion wise to warm (hot) water with vigorous stirring to avoid lump formation.