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      A high-throughput plasmonic tongue using an aggregation assay and nonspecific interactions: classification of taste profiles in maple syrup

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          Abstract

          A simple colorimetric test detects off-flavour profiles of maple syrups in minutes, which are detectable by the naked eye.

          Abstract

          A simple colorimetric test detects off-flavour profiles of maple syrups in minutes, which are detectable by the naked eye. As flavour profiles are due to complex mixtures of molecules, the test uses nonspecific interactions for analysing the aggregation and color change of Au nanoparticles (AuNPs) induced by the different organic molecules contained in off-flavour maple syrup. The test was optimal with 13 nm citrate-capped AuNPs reacting 1 : 1 with pure maple syrup diluted 10 times. Under these conditions, normal flavour maple syrups did not react and the solution remained red, while off-flavoured maple syrups aggregated the AuNPs and the solution turned blue. Different classes of molecules were then tested to evaluate the types of compounds typically found in maple syrups reacting in the test, showing that sulfur- and amine-containing amino acids and aromatic amines caused aggregation of the AuNPs. The test was validated with 1818 maple syrup samples from the 2018 harvest in Quebec and 98% of the off-flavoured maple syrups were positively identified against the standard taste test. Preliminary tests were performed on site in maple sugar shacks to validate the applicability of the test on the production site.

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          Most cited references32

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          Gold nanoparticles in chemical and biological sensing.

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            The synthesis of SERS-active gold nanoflower tags for in vivo applications.

            This paper reports a simple, one-pot, template-free synthesis of flower-like Au nanoparticles (three-dimensional branched nanoparticles with more than 10 tips) with high yield and good size monodispersity at room temperature. The size of the Au nanoflowers could be tuned by controlling the composition of the starting reaction mixture. The key synthesis strategy was to use a common Good's buffer, HEPES, as a weak reducing and particle stabilizing agent to confine the growth of the Au nanocrystals in the special reaction region of limited ligand protection (LLP). Time-course measurements by UV-vis spectroscopy and TEM were used to follow the reaction progress and the evolution of the flower-like shape. The Au nanoflowers exhibited strong surface-enhanced effects which were utilized in the design of an efficient, stable, and nontoxic Raman-active tag for in vivo applications.
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              Seedless, Surfactantless, High-Yield Synthesis of Branched Gold Nanocrystals in HEPES Buffer Solution

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                Author and article information

                Journal
                AMNECT
                Analytical Methods
                Anal. Methods
                Royal Society of Chemistry (RSC)
                1759-9660
                1759-9679
                2020
                2020
                Affiliations
                [1 ]Département de Chimie
                [2 ]Centre Québécois des Matériaux Fonctionnels (CQMF)
                [3 ]Regroupement Québécois des Matériaux de Pointe (RQMP)
                [4 ]Université de Montréal
                [5 ]Montréal
                Article
                10.1039/C9AY01942A
                b4c49b02-99a0-4f19-a239-d6a1ab5613bd
                © 2020

                http://rsc.li/journals-terms-of-use

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