Charge-based Filtration
Charge-based Filtration - Related Videos
02:42
Formal Charges
0 Views •
2020
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists. Calculating Formal Charge The formal charge of an atom in a molecule is the hypothetical charge the atom would have if the electrons in the bonds are evenly distributed between the atoms. Alternatively, formal charge results when from the number...
01:32
Filtration and Urine Formation
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2019
The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys. Blood enters the renal...
01:26
Glomerular Filtration: Net Filtration Pressure
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2025
Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP). GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal tubule,...
03:27
Ions and Ionic Charges
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2020
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called ions. When...
00:53
Filtration
0 Views •
2024
Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
FAQs
pH determines whether a molecule carries a positive, negative, or altered net charge under the separation conditions. That change affects its electrostatic attraction to a charged membrane, resin, or filter material. Consequently, adjusting pH can favor retention of some components while reducing interaction with others. In biological mixtures, this provides a controllable way to alter selectivity before downstream analysis.
Ionic strength changes the effectiveness of electrostatic interactions between analytes and the charged separation material. Higher or lower ionic strength can weaken or strengthen binding, depending on the system, and therefore influence when a molecule remains associated or is released. This makes ionic strength an important control for elution, allowing conditions to be adjusted to recover selected components while reducing unwanted retention.
Charge-based filtration offers a different selectivity from size- or affinity-based separation. Its performance depends on electrostatic interactions, whereas the other approaches use size or affinity as distinguishing properties. Combining these strategies can broaden separation of complex biological mixtures, especially when charge differences provide useful discrimination that another method may not supply.
A basic workflow begins by exposing the sample to a charged membrane, resin, or filter material under a chosen pH. Because pH sets molecular charge, it helps establish which analytes interact with the material. Ionic strength can then be changed to modify binding and control elution. This sequence supports enrichment, contaminant removal, or preparation for downstream assays.
The approach supports purification and analysis of proteins, nucleic acids, viruses, and other biomolecules. These materials may occur together in complex biological mixtures, where charge differences can help separate target compounds from unwanted components. Applying the method to different biomolecule classes makes it relevant across biological sample preparation, analytical workflows, and processes that require improved sample quality.
By enriching target compounds and removing contaminants, charge-based filtration can improve the quality of biological samples before further testing or processing. The resulting preparation may support downstream assays, diagnostics, and bioprocessing. Its value lies not only in separating components, but also in producing a cleaner or more concentrated sample for subsequent biological analysis.