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  • Halloysite Nanotube-Based H2O2-Responsive Drug Delivery System with a Turn on Effect on Fluorescence for Real-Time Monitoring
  • 来源:张海磊副教授个人网站 2020-08-29
  • In this paper, a

    novel halloysite-based hydrogel with a “turn-on” fluorescence character upon H2O2

    was facilely prepared and used to construct the H2O2-responsive

    drug delivery system, in which a coprecipitation

    method was proposed to afford the drug-loaded halloysite

    nanotubes

    (DHNTs). DHNTs were carefully characterized by

    FTIR, TGA, XPS, XRD and TEM to demonstrate that the drugs were mainly loaded

    into the cavity rather than attached on the external surface of halloysite nanotubes (HNTs). The B-C linkage in the

    as-prepared hydrogel was broken in the presence of H2O2,

    resulting in the degradation and thereby a responsive

    release. The drug release was almost not occurred under the

    physiological concentration ([H2O2] = 0.02 μM), while a

    complete release (>90%) can be achieved under pathological concentration

    ([H2O2] = 200 μM). Moreover, the broken of B-C linkage

    triggered a transformation from arylboronates to phenols,

    in which the formed fluorescein gave rise to the change from non-fluorescent

    to fluorescent of the hydrogels.

    The fluorescence intensity enhanced

    with the increase of release rate, in which a good linear relationship can be

    achieved. The attractive properties make the halloysite-based

    hydrogels a promising

    application in the field of biomedicine.

  • [来源:中国聚合物网]
  • 了解更多请进入: 张海磊副教授个人网站
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