Some chemical properties, structures and mas parameters of nine target antibiotics.
Drug pKa Log P
Tetracycline pKa1 3.3 pKa2 7.7 pKa3 9.7 1.3
Oxytetracycline pK a1 3.2 pKa2 7.5 pKa3 8.9 3.6
Chlortetracycline pKa1 4.5 pKa2 7.8 pKa3 9.8 0.62
Doxycycline pK a1 3.0 pKa2 7.9 pKa3 9.2 1.9
Ciprofloxacin pKa1 6.1 pKa2 8.6 0.28
Danofloxacin pK a1 6.0 pKa2 8.7 1.3
Enrofloxacin pKa1 6.4 pK a2 7.8 1.6
Pefloxacin pKa1 5.6 pK a2 6.5 0.88
Nalidixic acid pKa1 6.1 pKa2 8.6 1.5