Nitric Oxide-Releasing Alginates.
Nitric Oxide-Releasing Alginates.
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DOI:
10.1021/acs.biomac.8b00063
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发表时间:
2018-04-09
影响因子:
6.2
通讯作者:
Schoenfisch MH
中科院分区:
文献类型:
--
作者:
Ahonen MJR;Suchyta DJ;Zhu H;Schoenfisch MH
Low and high molecular weight alginate biopolymers were chemically modified to store and release potentially therapeutic levels of nitric oxide (NO). Carbodiimide chemistry was first used to modify carboxylic acid functional groups with a series of small molecule alkyl amines. The resulting secondary amines were subsequently converted to N-diazeniumdiolate NO donors via reaction with NO gas under basic conditions. NO donor-modified alginates stored between 0.4–0.6 µmol NO·mg−1. In aqueous solution, the NO-release kinetics were diverse (0.3–13 h half-lives), dependent on the precursor amine structure. The liberated NO showed bactericidal activity against Pseudomonas aeruginosa and Staphylococcus aureus with pathogen eradication efficiency dependent on both molecular weight and NO-release kinetics. The combination of lower molecular weight (~5 kDa) alginates with moderate NO-release durations (half-life of ~4 h) resulted in enhanced killing of both planktonic and biofilm-based bacteria. Toxicity against human respiratory epithelial (A549) cells proved negligible at NO-releasing alginate concentrations required to achieve a 5-log reduction in viability in the biofilm eradication assay.
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