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SDS-PAGE electrophoresis by Dr. Anurag Yadav
1. Presenter Dr Anurag Yadav
Post-graduate, biochemistry
Father Muller Medical college
Dr Anurag yadav,Bio-FMMC1
ELECTROPHORESIS
2. SDS-PAGE
Dr Anurag yadav,Bio-FMMC2
Sodium dodecyl sulphate- polyacrylamide gel
electrophoresis.
Most widely used method for analysing protein
mixture qualitatively.
Useful for monitoring protein purification – as
separation of protein is based on the size of the
particle.
Can also be used for determining the relative
molecular mass of a protein.
3. Dr Anurag yadav,Bio-FMMC3
Mercaptoethanol will break the disulphide bridges.
SDS binds strongly to and denatures the protein.
Each protein is fully denatured and open into rod-
shape with series of negatively charged SDS
molecule on polypeptide chain.
SDS is an
anionic
detergent.
The sample is
first boiled for
5min in buffer
containing
• Beta-
Mercaptoethanol
• SDS
4. Dr Anurag yadav,Bio-FMMC4
On average, One SDS molecule bind for every
two amino acid residue.
Hence original native charge is completely
swamped by the negative charge of SDS
molecule.
Also referred as Discontinuous gel
electrophoresis.
6. Dr Anurag yadav,Bio-FMMC6
Stacking gel: ordering/arranging and conc the
macromolecule before entering the field of
separation. (4% of acrylamide)
• Purpose is to concentrate protein sample in sharp band
before enters main separating gel.
Running gel: the actual zone of separation of
the particle/molecules based on their mobility.
(15% of acrylamide)
Pore size: routinely used as 3% to 30% which
is of pore size 0.2nm to 0.5nm resp.
10. Dr Anurag yadav,Bio-FMMC10
In separating gel, protein separate owing to
molecular sieving properties.
Smaller proteins pass more easily, larger one
retarded by friction.
11. - Research tool
- Measuring molecular weight
- Peptide mapping
- Protein identification
- Determination of sample purity
- Identifying disulfide bonds
- Separation of proteins and establishing size
- Blotting
- Smaller fragments of DNA
- Separation of nucleic acids
- Major clinical use – ALP separation
APPLICATION:
12. ADVANTAGES:
- Clear, fairly easy to prepare
- Exhibit reasonable mechanical strength over
acrylamide conc
- Low endosmosis effect
DISADVANTAGES
- Gel preparation and casting- exacting n time-
consuming
- Complete reproducibility of gel preparation not
possible
13. STAINING:
Fluorescent stains - Ethidium bromide – Nucleic
acids
Silver stain for protein gel (sensitive 50 times dye
based)
Dye based – Coomassie blue – 50ng protein
band
Tracking dyes – BPB> xylene cyanol, Orange G
15. References
Dr Anurag yadav,Bio-FMMC15
Keith Wilson- Principles and techniques of
biochemistry and molecular biology.
Upadhyay- biophysical chemistry.
Tietz- Text book of clinical chemistry.
Kaplan- clinical chemistry.
YouTube and Google images.