Ph Partitioning
Ph Partitioning - Related Videos
01:14
Extraction: Partition and Distribution Coefficients
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2024
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium. For extracting a solute from an aqueous phase into an organic...
10:59
Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy (FCS)
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Cited by 9 •
2012
A technique to probe the lipid raft partitioning of fluorescent proteins at the plasma membrane of living cells is described. It takes advantage of the disparity in diffusion times of proteins located inside or outside of lipid rafts. Acquisition can be performed dynamically in control conditions or after drug addition.
11:11
Determination of Plasma Membrane Partitioning for Peripherally-associated Proteins
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Cited by 5 •
2018
Here, we present a protocol to perform a quantitative analysis of the level of plasma-membrane association for fluorescently-tagged peripherally-associated protein. The method is based on the computational decomposition of membrane and cytoplasmic component of signal observed in cells labeled with plasma membrane fluorescent marker.
11:50
Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Cited by 5 •
2015
We present a procedure to determine the metal-silicate partitioning of siderophile elements, emphasizing techniques that suppress the formation of metal inclusions in experiments for the noble metals. The results of these experiments are used to demonstrate the effect of core-formation on the highly siderophile element composition of the mantle.
05:36
Herbs-Partitioned Moxibustion on the Navel in a Rat Model of Primary Dysmenorrhea with Cold Coagulation and Blood Stasis
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Cited by 4 •
2024
Here, we describe in detail the operation procedures and precautions to be taken during herbs-partitioned moxibustion on the navel in the treatment of primary dysmenorrhea in rats with cold coagulation and blood stasis, which can significantly improve the writhing reaction of dysmenorrhea rats and alleviate pain.
FAQs
The key variable is the proportion of a weak acid or base present in charged versus uncharged form. As that proportion changes, the substance shifts between greater water solubility and greater compatibility with lipid membranes. This balance helps explain why the same compound may remain in an aqueous compartment under one condition but cross a biological membrane more readily under another.
Body compartments do not necessarily present identical pH conditions, so a medication may experience different ionization states as it moves between them. Those changes can alter membrane passage, local aqueous retention, and tissue distribution. Consequently, pH partitioning provides a framework for interpreting why a drug’s clinical behavior may vary across compartments even when the substance itself remains unchanged.
Charged molecules generally remain more soluble in water, whereas uncharged molecules generally interact more readily with lipid environments. A shift in the relative amounts of these forms therefore changes where a substance tends to partition. This relationship links molecular ionization to practical outcomes such as membrane permeation, accumulation in aqueous spaces, and movement between biological environments.
Clinical interpretation begins by considering the surrounding pH and how it changes the drug’s charged and uncharged fractions. The expected balance can then inform whether membrane passage or aqueous retention is more likely. This reasoning supports predictions about absorption and tissue distribution, while also helping clinicians understand how physiological conditions may contribute to variation in medication response.
The relationship between ionization, water solubility, and lipid permeability can guide decisions about how a medication should be formulated and dosed. A formulation must support the intended movement and availability of the substance, while dosage decisions must account for how surrounding physiological conditions may alter distribution. These considerations connect physicochemical behavior with practical medication design.
Urinary excretion is influenced by the form a substance takes in the relevant biological environment. Because ionized material is generally more water-soluble and uncharged material crosses lipid membranes more readily, pH-dependent changes can affect whether a compound remains in an aqueous urinary compartment or redistributes across membranes. This provides a framework for interpreting pH-related differences in medication elimination.