Ammonium Sulfate Gradient
Ammonium Sulfate Gradient - Related Videos
09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Cited by 33 •
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We demonstrate the extraction of ammonium from an ammonium-rich stream using an electrochemical and a bioelectrochemical system. The reactor setup, operation and data analysis are discussed.
03:15
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In this video, we demonstrate a procedure for combined Alcian blue and silver staining of sulfated glycosaminoglycan oligosaccharide fragments. This combined staining technique significantly amplifies the bands of glycosaminoglycan polymers of different lengths in polyacrylamide gels.
04:17
Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate
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Cited by 1 •
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The present protocol describes the utilization of ammonium formate for phase partitioning in QuEChERS, together with gas chromatography-mass spectrometry, to successfully determine organochlorine pesticide residues in a soil sample.
01:26
What is an Electrochemical Gradient?
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2026
Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an ion’s...
12:00
Preparation and Characterization of SDF-1α-Chitosan-Dextran Sulfate Nanoparticles
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Cited by 8 •
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The objective of this protocol is to incorporate SDF-1α, a stem cell homing factor, into dextran sulfate-chitosan nanoparticles. The resultant particles are measured for their size and zeta potential, as well as the content, activity, and in vitro release rate of SDF-1α from the nanoparticles.
FAQs
The separation depends on water availability around each protein. As ammonium sulfate concentration rises, sulfate ions compete with proteins for water, reducing protein hydration. Molecules that lose sufficient hydration at a given saturation level precipitate, while others remain in solution until higher concentrations are reached. This differential response creates separable protein fractions.
Different proteins reach precipitation at different ammonium sulfate saturation levels because their hydration is reduced to different extents as salt concentration increases. Tracking which material appears in each fraction therefore separates proteins by solubility rather than collecting the entire mixture at once. This behavior can reveal a protein’s solubility profile for later process decisions.
A gradient maps when proteins leave solution across a controlled concentration range. Researchers can compare the resulting fractions to identify solubility profiles and determine where particular proteins become concentrated or separated from other mixture components. This information supports process development by guiding fraction collection and preparing material for subsequent purification steps such as chromatography.
Equilibration gives the added salt time to interact with the mixture before phase separation. Centrifugation then separates the precipitated material from the remaining solution, allowing each portion to be collected as a distinct fraction. Without these stages, the intended concentration-based partitioning would not be resolved.
A typical sequence consists of adding ammonium sulfate stepwise or across a planned concentration range, allowing each condition to equilibrate, and centrifuging the mixture. The precipitated material and remaining solution are then collected as separate fractions. Repeating this sequence across increasing concentrations produces a set of samples with different protein contents.
Collected fractions show which proteins precipitate at particular ammonium sulfate saturation levels and which remain soluble at those conditions. Comparing the fractions can reveal differences in protein solubility and indicate how effectively the mixture has been partitioned. The results also help assess recovery before later purification or concentration steps.
In bioengineering, the method can concentrate or partially purify enzymes, antibodies, and recombinant proteins from complex biological mixtures. It is especially useful before chromatography, where an initial salting-out step may improve downstream recovery. Because the approach can maintain biological activity, it supports preparation of functional protein material for further processing or analysis.