Convolution Neural Network-Assisted Smart Fluorescent-Tongue Based on Lanthanide Ion-Induced Forming MOF/HOF Composite for Differentiation of Flavor Compounds and Wine Identification

Abstract

Wine flavor is a vital quality characteristic in wine, influenced by those flavor components with low sensory thresholds. It is crucial to recognize and classify the wine components related to their flavor contribution. The integration of fluorescent sensors and artificial intelligence shows huge potential in flavor recognition by emulation of the gustatory perception system. Meanwhile, achieving information identification of wine based on multiple information barcodes has hopeful applications in anticounterfeiting. In this study, we present a simple method in which organic linkers are weaved into a hydrogen-bonded organic framework (HOF) for the available transformation of a metal-bonded organic framework (MOF) induced by lanthanide ions (Ln 3+ ). The fluorescent Ln-MOF/HOF composite exhibits high sensitivity, rapid response, and good recyclability for detecting seven flavor compounds in wine, including tannic acid, ionone, vanillin, anethole, anisaldehyde, hydroxybenzaldehyde, and 4-hydroxy-2-methylacetophenone. Depending on its satisfactory detectability, a novel strategy is provided in which a fluorescent sensor is able to function as a smart fluorescent-tongue (F-tongue) by the aid of convolutional neural network to differentiate these seven flavor compounds. In addition, the Ln-MOF/ HOF composite has been used to prepare multiple information barcodes for wine information identification on the basis of dynamic fluorescence response toward tannic acid. The mimetic gustatory perception system developed in this study may offer a promising strategy for flavor recognition in food and further food anticounterfeiting.

Multicolor Fluorescent Inks Based on Lanthanide Hybrid Organogels for Anticounterfeiting and Logic Circuit Design

“…Over the past few decades, a variety of technologies, such as hologram, watermarking, security code, , and fluorescent pattern, , have been developed for anticounterfeiting application. Among the existing anticounterfeiting technology, the fluorescent materials are widely used because of their color luminescence, good visibility, and simple design. − With the development of anticounterfeiting technology, the main manifestation is the continuous preparation of luminescent materials with highly designable properties, which include organic dyes, , nanoparticles and carbon dots, − and lanthanide luminescent materials, − enabling the fluorescent color diversity of anticounterfeit marks. Among them, lanthanide photoluminescent materials have unique luminescent properties such as high color purity, unique narrow emission, and long luminescence lifetime .…”

Subtle Structural Variations within Solvent-Free D–A-Type Organic Crystals for Tuning Emission Wavelength up to 47 nm Shift

“…The precise control of luminescence wavelengths in organic crystal materials is of paramount importance to meet the diverse demands across various domains. − Through the careful selection of construction units, adjustment of donor–acceptor distances, − control over crystal structure, codoping, , and manipulation of external conditions, such as temperature, , pressure, and solvent type, ,− arises the precise modulation of the fluorescence wavelength . In particular, solvents usually play a significant role in determining the lattice composition of porous HOFs and can act as structure-directing agents, resulting in distinct crystal structures with different luminescent properties. − Although the luminescence regulation strategies of organic crystal materials have been extremely extensive, the control of luminescence shifts in solvent-free dense isomorphism frameworks through the manipulation of the crystallization mother liquor is exceptionally rare.…”

Two dye-encapsulated triple-emitting naphthalene-based Zr-MOFs for tunable white-light emission and dual mode detection of inorganic ions

“…Compared to the complex and strong competence of chromatography methods, fluorescence detection methods exhibit many advantages such as affordability, convenience, fast response and visualization. 10–13 To cope with the increasingly complex detection environment, the preparation of fluorescent sensors with high stability, sensitivity, selectivity and convenience has become crucial.…”