TY  - JOUR 
T1  - Determination of protonation constants of some tetracycline antibiotics by potentiometry and lc methods in water and acetonitrile-water binary mixtures
JO  - Journal of the Brazilian Chemical Society
A1  - Şanli, Senem
A1  - Şanli, Nurullah
A1  - Alsancak, Güleren
SN  - 0103-5053
UL  - 10.1590/S0103-50532009000500020
VL  - 20 
Y1  - 2009
PB  - Brazil 
ER  -