The teacher wants to know the isoelectric focusing electrophoresis experimental process
Isoelectric Focusing (IEF) is a technique that separates proteins based on differences in their isoelectric points (pI) within a pH gradient electric field. IEF utilizes the principle that biomolecules have a net charge of zero at their isoelectric point (pI), depositing them at specific pH gradients. The brief steps of isoelectric focusing electrophoresis are as follows:
1. Sample Preparation:
Depending on the experimental requirements, the protein sample may need to be processed or purified. The processed sample should be diluted or resuspended with an isoelectric focusing sample buffer.
2. Preparation of pH Gradient Gel:
First, prepare a polyacrylamide gel with a continuous pH gradient. This can be done using prefabricated pH gradient buffers or by preparing them yourself. Mix the polyacrylamide solution with the pH gradient buffer, then add TEMED and APS (initiators) to induce polymerization. Pour into the gel column of the focusing apparatus and wait for the gel to solidify.
3. Pre-treatment of Gel:
Before loading the sample, soak the gel in isoelectric focusing running buffer for about 15-30 minutes to ensure the stability of the pH gradient within the gel.
4. Sample Loading:
Apply the sample to one end of the gel. This is usually done by placing the sample on a paper strip in contact with the gel surface, or directly applying the liquid sample to one end of the gel.
5. Isoelectric Focusing Electrophoresis:
In the isoelectric focusing apparatus, connect the anode (positive electrode) to the high pH end of the gel column and the cathode (negative electrode) to the low pH end. Set the appropriate voltage and running time to start the isoelectric focusing electrophoresis. Typically, the initial voltage is low and gradually increases over time.
6. Protein Fixation and Staining:
After electrophoresis, the proteins usually need to be fixed and stained for observation and recording of results. Fixation is typically done using ketone or alcohol solutions, and staining can be performed using Coomassie Brilliant Blue or silver staining.
7. Imaging and Analysis:
Use an imaging system (such as a gel imager or scanner) to capture images of the stained gel. By analyzing the imaging results, information about the isoelectric point, types, and quantities of proteins can be obtained. Specialized bioinformatics software may be needed for data processing and analysis.
Please note that these are general steps for isoelectric focusing electrophoresis, and specific experimental conditions and steps may need to be optimized and adjusted according to the purpose of the experiment and the characteristics of the sample.
BiotechPack, A Biopharmaceutical Characterization and Multi-Omics Mass Spectrometry (MS) Services Provider
Related Services:
Protein Spot, Gel Strip, IP Sample Protein Identification Services
Two-Dimensional Gel Electrophoresis Services
Protein Separation Based on SDS-PAGE
How to order?
