HSP Application note #57
logP, logKow estimation accuracy
HSPiP Team Senior Developer, Dr. Hiroshi Yamamoto
If you have the Smiles or InChI molecular structure, you can estimate logP (logKow) very easily with HSPiP.
HSPiP(Hansen Solubility Parameters in Practice)
The first edition of HSPiP that appeared in November, 2008, greatly enhanced the usefulness of the Hansen solubility parameters (HSP).
The HSP values of over 1200++ chemicals and 500 polymers are provided in convenient electronic format and have been revised and updated using the latest data sources in the second edition (March, 2009).
A third edition of the HSPiP appeared in March, 2010. There are now 10,000 compounds in the HSP file which also includes data on density, melting point, boiling point, critical parameters, Antoine constants and much more. The user is able to carry out many different sorts of optimisations of solubility, evaporation, diffusion, adhesion, create their own datasets (automatically if required) and explore the huge range of applications for HSP in coatings, paints, nanoparticles, cosmetics, pharma, organic photovoltaics and much more.
The 3rd Edition v3.1 was released on 12 December 2010. Current users can upgrade free (now v3.1.09) by downloading the latest .msi installer from http://hansen-solubility.com
The 4th Edition v4.0.x was released on 2 Jan. 2013. The Current users can upgrade with free charge.
2013.1.28 The Visual How to manual of HSPiP. You can understand what HSPiP can do.
Smiles(Simplified Molecular Input Line Entry Syntax)
SMILES is a string obtained by printing the symbol nodes encountered in a depth-first tree traversal of a chemical graph.
Just input Smiles structure in TextField
Push calculate button
Program break molecule into functional groups and estimate properties.
Now I finished build new Y-MB ver. 3.1 and checking the accuracy.
I found the logP data for hormonally active agents (endocrine disrupting chemicals).
At first, I need to get the Smiles molecular structures. I searched in our HSPiP database. Almost all these compounds are already exist in our database and determined HCode (Hansen Code).
Once I get the Smiles molecular structures, I can easily get all estimated properties.
The only one molecule (HCode=21051) is out of the Line.
Compare with the similar compounds' logP, 3.18 is too small and predicted value 6.27 is very reasonable.
Above the HP, they listed SciQSAR and ScilogP estimation result. (I don't know which version they use)
But I can say, Y-MB ver. 3.1 have very good accuracy.
If you have other papers that list molecules and logP, please send me.
I will confirm my method.
If you are interested in logP and Hansen Solubility parameters, then please refer to this article.
If you are interested in hormonally active agents (endocrine disrupting chemicals), please refer to this article
Volatile Organic Compounds (VOC) Prediction Result.