体外研究
The MIC against
H. pylori
isolates ranged from 0.002-0.032 μg/mL (0.01-0.17 μM) in the agar dilution assay. HPi1 is effective against the clarithromycin-resistant strains ARHp172 (MIC of 0.004–0.016 μg/mL) and ARHp246 (MIC of 0.008–0.032 μg/mL).
HPi1 has some activity against the
Bacteroides species
, but at concentrations at least 18-fold higher than the
H. pylori
MIC. More potent activity is detected for
Campylobacter jejuni
with an MIC of 0.3 μg/mL.
HPi1 has good physicochemical and pharmacological properties, including determining the aqueous solubility (19 μg/mL), human plasma protein binding (93% bound), stability with human liver microsomes (T
1/2
of 1.3 hours) and the ability to passively permeate membranes.