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Peptide-Based Drug Design

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138 Hilpert et al.<br />

Table 2<br />

(Continued)<br />

Descriptor<br />

Ref. symbols a (number) Explanation<br />

log P Hydration potential or free energy of<br />

transfer from vapor phase to water<br />

logD Salt chromotography<br />

dG Partition coefficient for amino acids in<br />

octanol/water<br />

— Partition coefficient for acetylamide<br />

derivatives ofamino acids in octanol/water<br />

dG = RTln f; f = fraction buried/accessible<br />

amino acids<br />

HPLC retention times for nine combinations<br />

of three different pH and three eluent<br />

mixtures (9 descriptors)<br />

Lejon et al.,<br />

2001<br />

(3) a<br />

Lejon et al.,<br />

2004<br />

Jenssen et al., z1 First principal component of Hellberg et al.,<br />

2005<br />

1987, related to hydrophilicity<br />

z2 Second principal component of Hellberg<br />

et al., 1987, related to bulk<br />

z3 Second principal component of Hellberg<br />

et al., 1987, related to electronic<br />

properties<br />

Frecer et al.,<br />

2004<br />

(3)<br />

Qm<br />

Total charge<br />

AI<br />

�<br />

o/w<br />

Amphipathicity<br />

Lipophilicity index<br />

Frecer, 2006 (25)<br />

Q Total charge<br />

L Overall lipophilicity<br />

P, N Lipophilicity of polar and nonpolar faces<br />

Sp,Sn<br />

Surface area of polar and nonpolar faces<br />

Mw, MwP,MwN Molecular mass of polar and nonpolar faces<br />

CSL, CHL ,CAR Count of small lipophilic, highly lipophilic<br />

and aromatic residues forming the<br />

nonpolar face total number of hydrogen<br />

bond donor and acceptor centers

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