Abstract
Salicylhydroxamic acid (SHA) is used as antimicrobic medicine and its concentration has to be monitored in urine. For the first time, silica xerogels doped with iron(III) have been proposed as sensor materials for SHA determination in biological samples. Three xerogels with iron(III) content in the range of 0.04–1.74% wt have been synthesized. BET surface area of these xerogels has varied in the range of 696–529 m2/g and total pore volume has varied in the range of 0.92–0.23 cm3/g. Complex formation between immobilized iron(III) and salicylhydroxamic acid has been investigated with solid phase spectrophotometry and IR spectroscopy. Orange-brown iron(III)-SHA complex with 1:1 stoichiometry is formed at pH 1–4 with half-reaction time of 17 min. Silica xerogel doped with 0.33% wt iron(III)) has been used as sensor material for SHA solid phase spectrophotometric determination (LOD 1.4 mg/L (n = 3), analytical range 4–230 mg/L). Proposed sensor material has been applied for SHA determination in biological samples of synthetic and human urine. The proposed procedure is characterized by a good level of accuracy (recovery values 97–120%) and precision (RSD values 4–9%) and can be recommended for pharmacokinetic–pharmacodynamic studies of hydroxamic acid-based medications.
Highlights
Hydroxamic acids (HA) are well-known for their outstanding complexation properties: complexes with 19 metals are known
Since Salicylhydroxamic acid (SHA) is known for forming colored complexes with iron(III), we decided to prepare silica xerogel doped with iron(III) for that purpose
In order to design the sensor material for salicylhydroxamic acid (SHA) determination, we have prepared silica xerogels doped with various content of iron(III) (0.04–1.74% wt)
Summary
Hydroxamic acids (HA) are well-known for their outstanding complexation properties: complexes with 19 metals are known. The biological and medical importance of HA is well recognized in processes such as microbial iron transport, the hem-dependent prostaglandin-H synthase, inhibition of the nickel-dependent urease enzymes, and the zinc-dependent matrix metalloproteinases [2]. HA are outstanding zinc chelating compounds that can be used to design potent and selective metalloenzyme inhibitors in various therapeutic areas [3]. Several HA have been reported to possess antibacterial or antiviral properties. The application of HA in the non-infectious diseases include inhibition of glutamate carboxypeptidase II in neuropathic pain, inhibition of insulin-degrading enzyme in type 2 diabetes, and inhibition of matrix metalloprotease in fibrinolysis control [3]
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