Cassandra Maddux
CHE 451L-02
August 26, 2014
Electrophoresis
Introduction
Separating charged molecules is an important practice in Biochemistry for identifying a wide range of data fields. Separating molecules allows for information like size, binding affinity, and charge to be obtained.5
One technique that is used to separate charge molecules is gel electrophoresis. This technique forces the suspended charged molecules through a porous gel matrix by use of an electrical current that separates the molecules according to their physical properties, such as charge, size.1,2,3 It was first observed by Ferdinand Frederic Reuss in 1807. He observed that when an electrical current was applied, clay molecules in water would begin to migrate.6
Samples are placed in wells on the gel. A buffer is added, commonly salt water, to act as a conduit for the electrical current. As the electric current is applied, the samples begin to move through the gel depending on the contained molecule’s properties; positively charged particles will move towards the cathode and negatively charged particles will move to the anode.2 Compounds with greater charge or low mass will move through the gel matrix quicker and further.
As the samples move, they create lanes of bands that can then be compared to a standard, also known at a ladder. The thickness of each band is indicates quantity of each compound contained in the sample. The height of each band shows the size of each molecule in the sample.4
The content of this section depends to a large extend on the nature of the experiment. Topics here should include a section labelled:
This is where electrons are transferred from one ion to another, so there is an electrostatic force between the ions. Variables involved: For this experiment I would expect to have 3 different variables, Independent, Dependent, and fixed variables, which all helps me to plan and explain the experiment thoroughly. The Independent variable, the thing that I will be changing in this experiment into the combustion of a range of alcohols, they will be four different alcohols, Methanol, Ethanol, Propanol, and Pentanol, which will help me to investigate combustion of different alcohols.
* The battery applies a voltage to the plates, charging one plate positive and the other plate negative. Alpha particles constantly released by the americium knock electrons off of the atoms in the air, ionizing the oxygen and nitrogen atoms in the chamber. The positively-charged oxygen and nitrogen atoms are attracted to the negative plate and the electrons are attracted to the
This technique separates Rubisco samples based on their size. The electrophoresis has a positive and a negative end. Positive charge proteins are loaded from the positive end and migrate towards the negative end. Negative charge proteins are loaded from the negative end and migrate towards the positive end (Sakthivel & Palani, 2016). The sample that contained the highest molecular weight of Rubisco will travel the shortest distance on the gel while the protein with the smallest molecular weight will travel the longest distance (Sakthivel & Palani, 2016). The size proportion of each Rubisco molecule correlates with the distance traveled. Rubisco will be in its purest form after running through SDS-page since each technique will increase the purity of the protein. If the salting out, the ion exchange and the SDS-page protein isolation techniques are performed on protein Rubisco, then it is purified and separated by solubility, charge, and size. The rationale of this experiment is to isolate the purest form of Rubisco so that it can perform carbon fixation at an optimal
The purpose of this experiment is to practice common organic laboratory techniques inside the lab to get one oriented to the basic methods of procedure that can be used for later experiments. This experiment involves the separation of benzoic acid from a more crude form, consisting of benzoic acid, methyl orange, a common acid/base indicator, and cellulose, a natural polymer of glucose (Huston, and Liu 17-24). The technique that is used to perform this separation is called extraction. Extraction is a systematic process of separating mixtures of compounds, taking advantage of the affinity differences of compounds to separate them (Padias 128-37). This technique recognizes the principle that “like dissolves in like,” that is,
1. We measured 2 mL of diluted hydrogen peroxide (the substrate), 1 mL of guaiacol (the product indicator), and 1 mL of neutral buffer (pH 7) with a syringe and disposed it into tubes 1, 2 , 4, 9, 11, and 12.
Table 1 contained the number of bands and the size of each band for each sample. The first lane, the molecular ladder contained five bands with molecular weights of 97kDa, 65kDa, 45kDa, 30kDa, and 14.4kDa, respectively from the top to the bottom the gel. The second lane, filtrate contained four bands with the molecular weight of 135kDa, 41.6kDa, 16.6kDa, and 11.2kDa, respectively from the top to the bottom. The third lane, S1 contained three bands with the
The first experiment begun by filling a 600-ml beaker, almost to the top, with water. Next, a 10-ml graduated cylinder was filled to the top with water. Once water was added to the beaker and graduated cylinder, a thumb was placed over the top of the graduated cylinder. This would ensure that no water was let out and no bubbles were let into the graduated cylinder. Next, it was turned upside down and fully submerged into the beaker. Then, a U-shaped glass tube was attained. The short end of the glass tube was placed into the beaker with the tip inside of the graduated cylinder. Next, a 50-ml Erlenmeyer flask was received. After, 10-ml of substrate concentration and 10-ml of catalase/buffer solution were placed into the flask. A rubber stopper was then placed on the opening of the flask. After adding these, the flask was held at the neck and spun softly
Note: Your prelab/lab report is to be done in your carbon copy lab notebook (sold in FIU bookstore)
The proteins are also added to a Laemmli sample buffer in order to give each protein a negative charge so it is able to get pulled through the polyacrylamide gel. The next step is to put the gel into the electrophoresis module and to run it. It is run until the proteins have almost reached the bottom of the gel. A blue tracking dye is added to the Laemmli sample buffer in order to track the distance in which the proteins travel through the gel. If it is run for too long, the proteins will run off the bottom of the gel and it will mess up your results. Once the protein reach the bottom of the gel, the gel is stained in order to be able to see the individual bands of the different proteins. When the gel is stained, the protein distances will be able to be measured and compared. For a detailed procedure, refer to the Comparative Proteomics Kit I: Protein Profiler Module Lab Manual.
The establishment of electrochemical gradient is one of the driving forces for ion movement across the cell membrane. Cells are usually negative and surrounded by positively charged extracellular fluids. All transport processes across cells impact the chemical gradients. There are two primary transport processes that affect electrical gradients, electroneutral carriers and electrogenic carries. Electroneutral carries transport uncharged molecules or exchange an equal number of particles with the same charge across the membrane, ultimately not changing the overall elecrtochemical gradient. Electrogenic carriers result
The separation of molecular particulates from any mixture may involve any combination of the relative chemical, electrostatic, and mechanical properties composing each component contained therein. Typically this mixture may exist as a liquid solution or gaseous species. The respective interactions of each particulate depend on the surrounding conditions to which the solution is subjected. A solvent is utilized to dissolute the mixture such that it may pass through a separation chamber that contains
After the column the separated compounds enter the detector, which measures a physical or chemical property of each, now relatively pure, compound and creates a proportional electronic signal. By calibrating with a standard mixture of known compounds, the nature of the compound in the
Every chemical has a unique set of spectral lines just like every person has a unique set of fingerprints. Although these two things seem very similar, they are not completely the same. There are many different chemicals, but all atoms of one specific chemical have the same set of spectral lines. This is different than people’s fingerprints because of the 7.4 people on earth, no two fingerprints are alike. With the chemicals, many atoms with the same spectral lines form to create the chemical. Although this makes them somewhat different, the technique of identifying chemicals by their spectral line patterns with that of identifying people by their fingerprints is very similar because every chemical has a different set of spectral lines just
Robert Millikan and Henry Fletcher had to be very clever to pull off this experiment effectively because they couldn’t just take out an electron from an atom and measure its charge. They figured out a way to do this experiment by using tiny drops of oil and balanced them floating in mid air using electricity and gravity. Using thus technique, they were able to