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• W2029580015 abstract "Alginate gels are widely used for drug delivery and implanted devices. The rate at which these gels break down is important for controlling drug release. Since the de-gelation may be different in vivo, monitoring this process in situ is essential. However, it is challenging to monitor the gel through tissue due to optical scattering and tissue autofluorescence. Herein we describe a method to detect through tissue the chemically-induced changes in viscosity and de-gelation process of alginate gels using magnetically modulated optical nanoprobes (MagMOONs). The MagMOONs are fluorescent magnetic microspheres coated with a thin layer of opaque metal on one hemisphere. The metal layer prevents excitation and emission light from passing through one side of the MagMOONs, which creates orientation-dependent fluorescence intensity. The magnetic particles also align in an external magnetic field and give blinking signals when they rotate to follow an external modulated magnetic field. The blinking signals from these MagMOONs are distinguished from background autofluorescence and can be tracked on a single particle level in the absence of tissue, or for an ensemble average of particles blinking through tissue. When these MagMOONs are dispersed in calcium alginate gel, they become sensors for detecting gel degradation upon addition of either ammonium ion or alginate lyase. Our results show MagMOONs start blinking approximately 10 minutes after 2 mg/mL alginate lyase addition and this blinking is clearly detected even through up to 4 mm chicken breast. This approach can potentially be employed to detect bacterial biofilm formation on medical implants by sensing specific proteases that either activate a related function or regulate biofilm formation. It can also be applied to other biosensors and drug delivery systems based on enzyme-catalyzed breakdown of gel components." @default.
• W2029580015 created "2016-06-24" @default.
• W2029580015 creator A5023555418 @default.
• W2029580015 creator A5033062773 @default.
• W2029580015 date "2014-12-01" @default.
• W2029580015 modified "2023-10-01" @default.
• W2029580015 title "Detecting de-gelation through tissue using magnetically modulated optical nanoprobes (MagMOONs)" @default.
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• W2029580015 doi "https://doi.org/10.1016/j.snb.2014.08.073" @default.
• W2029580015 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4530635" @default.
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