Exponential Molecular Amplification by H2O2-Mediated Autocatalytic Deprotection of Boronic Ester Probes to Redox Cyclers - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Chemistry - A European Journal Année : 2019

Exponential Molecular Amplification by H2O2-Mediated Autocatalytic Deprotection of Boronic Ester Probes to Redox Cyclers

Justine Pallu
Geordie Creste
Mathieu Branca
Benoit Limoges

Résumé

Herein, we describe a new molecular autocatalytic reaction scheme based on a H2O2-mediated deprotection of a boronate ester probe into a redox cycling compound, generating an exponential signal gain in the presence of O2 and a reducing agent or enzyme. For such a purpose, new chemosensing probes built around a naphthoquinone/naphthohydroquinone redox-active core, masked by a self-immolative boronic ester protecting group, were designed. With these probes, typical autocatalytic kinetic traces with characteristic lags and exponential phases were obtained using either a UV-visible or fluorescence optical detection, or also using an electrochemical monitoring. Detection of concentrations as low as 0.5 µM H2O2 and 0.5 nM of a naphthoquinone derivative were achieved in a relatively short time (< 1 hr). From kinetic analysis of the two cross-activated catalytic loops associated to the autocatalysis, the key parameters governing the autocatalytic reaction network were determined, indirectly showing that the analytical performances are currently limited by the slow nonspecific self-deprotection of boronate probes. Collectively, the present results demonstrate the potential of this new exponential molecular amplification strategy, which, due to its generic nature and modularity, is quite promising for coupling to a wide range of bioassays involving H2O2 or redox cycling compounds, or for being used as a new building block in the development of more complex chemical reaction networks.
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Dates et versions

hal-02390846 , version 1 (06-12-2019)

Identifiants

Citer

Justine Pallu, Charlie Rabin, Geordie Creste, Mathieu Branca, François Mavré, et al.. Exponential Molecular Amplification by H2O2-Mediated Autocatalytic Deprotection of Boronic Ester Probes to Redox Cyclers. Chemistry - A European Journal, 2019, 25 (31), pp.7534-7546. ⟨10.1002/chem.201900627⟩. ⟨hal-02390846⟩
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