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. 2014 Nov 14;4:7057. doi: 10.1038/srep07057

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(A) Fluorescence intensity (λ = 477 nm) of ZG-20 NPs after overnight co-incubation with various amino acids and thiol compounds (5.0 mM) in PBS (pH = 7.4) at 37°C (λ_ex = 330 nm). Error bar: n = 3. Inset: Fluorescence images of the resulted NP solutions under UV lamp. From bottom left to top right: ZG-20 NPs treated with DTT, Cys, Hcy, GSH, Methionine (Met), Alanine (Ala), Glycine (Gly), Leucine (Leu), Histidine (His), Isoleucine (Ile), Tryptophan (Trp), Tyrosine (Tyr), Aspartic acid (Asp), Arginine (Arg), Asparagine (Asn), Lysine (Lys), Phenylalanine (Phe), Threonine (Thr), Proline (Pro), Serine (Ser), Valine (Val), Glutamine (Gln) and Glutamic acid (Glu). (B) Fluorescence spectra of the NP solution after overnight co-incubation with various concentrations of Cys in PBS (pH = 7.4) at 37°C.