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#Sephadex G-50

2 public questions tagged with this topic.

Chromatography

Correct elution order from Sephadex G-50?

Sephadex G-50 fractionates molecules within 1,500-30,000 Da range. Molecules above 30 kDa are fully excluded, cannot enter dextran pores, eluting at void volume first. Smaller molecules penetrate to varying extents; intermediate sizes partially included elute next, while very small molecules fully included elute last. Therefore progression from high to low molecular weight from early to late fractions defines correct order. Confusing small-to-large would invert physical principle. Recognizing large-to-small order aids in planning preparative separations, such as separating proteins from peptid

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Chromatography

What is the exclusion limit of Sephadex G-50?

Sephadex is cross-linked dextran gel classified by G-value indicating degree of cross-linking and porosity. G-50 denotes moderate cross-linking with fractionation range for globular proteins approximately 1,500 to 30,000 daltons. Molecules larger than 30,000 daltons are excluded, eluting at void volume; smaller molecules penetrate and are retarded. Exclusion limit defines upper molecular weight threshold. Different grades like G-25, G-75, G-100 offer varying ranges. Knowledge of exclusion limits guides selection for desalting, buffer exchange, or separation of peptides from proteins, ensuring

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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