If you copy the relevant data file (psa.txt) to a local directory and
edit it, then the TPSA can be computed however you wish.

- Noel

On 6 January 2012 10:38, Pascal Muller <pascal.jm.mul...@gmail.com> wrote:
> Dear all,
>
> I just become aware that TPSA could be computed taking in account only N and
> O, or N/O/P/S. I always thought that the polar surface takes all polar atoms
> in account...
>
> I think that OpenBabel takes all atoms in account, but it seems that
> "correlation of TPSA with various ADME properties is better if only
> contributions from oxygen and nitrogen are used".
>
> http://sourceforge.net/tracker/?func=detail&aid=3015574&group_id=160139&atid=814650
> Journal of Medicinal Chemistry, 2010, Vol. 53, No. 13, p4830,
> "Cheminformatic Tools for Medicinal Chemists", Muchmore et al.
>
> Does OpenBabel have an option for outputing PSA for N/O only?
>
> If you have any other references for TPSA and ADME properties correlations,
> I'll be glad to hear about them.
>
> Regards,
> Pascal
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