What does a high LogP indicate?
LogP gives you an indication of how well the molecule will partition into the organic elution solvent. The higher the logP, the more likely the compound will partition from the SLE phase into the organic elution solvent like dichloromethane, ethyl acetate or MTBE.
What does a negative LogP indicate?
A negative logP value indicates preferential solubility in water and a positive value indicates an affinity for octanol.
How does LogP affect solubility?
High lipophilicity (logP>5) often contributes to high metabolic turnover, low solubility, and poor oral absorption. In addition, highly lipophilic compounds tend to bind to hydrophobic targets other than the desired target, and, therefore, there is an increased risk of promiscuity and toxicity.
What is LogP in Lipinski rule?
LogP is an important component of Lipinski’s Rule of 5 recommendations which predicts the drug-likeness of a new synthetic compound. According to Lipinski’s Rule of 5, an oral drug should have a LogP value <5, ideally between 1.35-1.8 for good oral and intestinal absorption.
What is the range of LogP value?
Limits of P values would be zero and infinite but they never occur. In the examples in wikipedia LogP go from 6.4 to -1.16.
What is LogP and logs?
logD is a log of partition of a chemical compound between the lipid and aqueous phases. The most popular lipid phase is octanol. LogP is equivalent to logD for non-ionisable compounds and represents the partition of the neutral form for ionizable compounds (and, hence, is a virtual, unmeasurable, property).
How is log p determined?
Log P and log D were determined by shake flask method, wherein, the compound was partitioned between presaturated noctanol and water phase (water/PBS pH 7.4) and the concentration of compound in each phase was determined by HPLC.
What determines LogP?
How do you find the p value of log?
Log P calculations are based on a pool of fragments predefined in the log P calculator. This set is based on the data set in Viswanadhan et al. Every fragment is assigned a unique name and a value. The log P value of a molecule is the sum of the fragment values that are present in the molecule.
Is there a correlation between logP and the polar surface area PSA of the molecule?
With, in broad terms, antibacterials having higher molecular weight, lower log P and higher polar surface area (PSA).
What is LOGP in HPLC?
Lipophilicity, expressed as the logarithmic value of the octanol/water partition coefficient (log Poct), is a fundamental parameter that models the biological partition behavior of drug molecules.
How is LogP value calculated?
Is LogP and pKa same?
A pKa, the pH at which a molecule is half-ionized, is important because most biologically active compounds are ionizable. LogP, a compound’s partition coefficient between an oily and aqueous phase, is used to predict absorption and is pKa-dependent.
How is LogP determined?
What is the log p value?
The logarithm of the ratio of the concentrations of the unionized solute in the solvents is called log P. The log P value is also known as a measure of lipophilicity1. The distribution coefficient for ionizable compounds depends on the pH. The pharmaceutical industry measures the log P value at pH = 7.4.
How do you calculate log P of a compound?
log P The log P value for a compound is the logarithm (base 10) of the partition coefficient (P), which is defined as the ratio of the compound’s organic (oil)-to-aqueous phase concentrations: Partition Coefficient (P) = [Organic] / [Aqueous], where [ ] is the compound’s concentration in that solvent phase log P = Log 10 (P)
What is logP and why does it matter?
So, what exactly is logP? LogP, or octanol-water partition coefficient, is a measure of how hydrophilic or hydrophobic a molecule is. It indicates how readily an analyte will partition between an aqueous and organic phase.
What determines the log P of a hydrocarbon molecule?
If there are several haloganeted atoms in the molecule, logP is also determined by only Volume. Br or I have very large volume, though if I plot them with volume, the line is same with hydrocarbon’s line.