☆ 4.5 Review

Nanoextraction based on surface nanodroplets for chemical preconcentration and determination

BIOMICROFLUIDICS (2022)

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Interfacial Partitioning Enhances Microextraction by Multicomponent Nanodroplets

Zixiang Wei et al.

Summary: This work demonstrates that colorimetric chemical reactions in surface nanodroplets can alter the partitioning of acid analytes, resulting in increased acidity within the droplets. The distribution coefficient of the acid can be shifted by 3-11 times compared to the bulk solution. Such enhanced extraction and partitioning in droplets may be leveraged for highly sensitive chemical detection.

JOURNAL OF PHYSICAL CHEMISTRY C (2022)

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In-syringe dispersive liquid-liquid microextraction

Valfredo Azevedo Lemos et al.

Summary: Dispersive liquid-liquid microextraction (DLLME) is widely used for the separation and preconcentration of various chemical species, with some systems using a syringe as an extraction environment. This review discusses methods utilizing this approach, critical aspects like dispersion promotion, analytical characteristics, and the pros and cons of the methods, as well as future trends in in-syringe microextraction systems.

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Review Chemistry, Analytical

Use of green alternative solvents in dispersive liquid-liquid microextraction: A review

Jose Grau et al.

Summary: Dispersive liquid-liquid microextraction is a widely used technique in analytical chemistry field due to its simplicity and rapidity. The operational mode has evolved over time, with changes mainly related to the nature of solvents used. Low-density solvents, ionic liquids, and other alternatives have been proposed as greener options for this method.

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Review Chemistry, Analytical

Dispersive liquid-liquid microextraction: Evolution in design, application areas, and green aspects

Muhammad Sajid

Summary: Since 2006, dispersive liquid-liquid microextraction (DLLME) has undergone several improvements in various aspects, including extraction device design, extractant dispersion strategies, solvent selection, and phase separation approaches. It has also been combined with other extraction techniques for wider applications. This review critically evaluates the advancements in simultaneous derivatization, automation, and instrumental coupling.

TRAC-TRENDS IN ANALYTICAL CHEMISTRY (2022)

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Biphasic Microdroplet-Microdroplet Extraction for Ultra-Trace Enriching Analysis

Xiaonan Zhang et al.

Summary: This study demonstrates a biphasic microdroplet-microdroplet extraction method using a mini-pillar platform for enrichment analysis. The method shows high efficiency and good linear relationships, and addresses the deficiencies of traditional liquid phase extraction technology.

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Sequential droplet reactions for surface-bound gold nanocrater array

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Summary: This study demonstrates the unique stability of femtoliter droplet arrays in contact with a flow. Using sequential reactions, reactive femtoliter droplets simplify the production process for surface-bound materials. Gold nanocraters are formed on a planar substrate by reacting water-insoluble thiol droplets with two aqueous solutions. The resulting gold nanoparticles exhibit stable catalytic activity in degrading azo dyes.

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Surface Nanodroplet-Based Extraction Combined with Offline Analytic Techniques for Chemical Detection and Quantification

Zhengxin Li et al.

Summary: Liquid-liquid extraction based on surface nanodroplets is a green and sustainable technique used to extract and concentrate analytes from a sample flow. However, only a few in situ analytical techniques are applicable for online detection and analysis based on nanodroplet extraction. In this study, the versatility of surface nanodroplet-based extraction was demonstrated, and the collected surface droplets were successfully analyzed using offline analytical techniques. The technique showed potential for streamlining the process of sample pretreatment for sensitive chemical detection and quantification using common analytic tools.

LANGMUIR (2022)

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Hydrophobic deep eutectic solvent-based ultrasonic-assisted dispersive liquid-liquid microextraction for preconcentration and determination of trace cadmium and arsenic in wine samples

Yinghe Ji et al.

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Elicia L. S. Wong et al.

Summary: Nanozymes are advanced nanomaterials that mimic natural enzymes and are ideal candidates for real-time and remote environmental monitoring and remediation due to their better structural stability. Through innovative nano-architectural design and transduction methodologies, Nanozymes have made significant progress in detecting heavy metal ions, pesticides, and organic pollutants. Strategies for remediating persistent organic pollutants are also discussed in this review.

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Strategies of dispersive liquid-liquid microextraction for coastal zone environmental pollutant determination

Yixiao Wang et al.

Summary: Coastal zones are exposed to pollutants from both land-based and sea-based activities, making it challenging to detect coastal pollutants quickly and sensitively. Dispersive liquid-liquid microextraction (DLLME) is an important sample preparation technique for environmental analysis due to its high enrichment ability, low reagent consumption, and wide applicability.

JOURNAL OF CHROMATOGRAPHY A (2021)

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Review Chemistry, Analytical

Applications of single-drop microextraction in analytical chemistry: A review

Suresh Kumar Kailasa et al.

Summary: SDME is recognized as a simple miniaturized sample preparation tool for the isolation and preconcentration of various analytes from complex sample matrices. The use of nanoparticles in SDME enables rapid analysis of trace-level target analytes. Introduction of new extracting solvent systems like ionic liquids, deep eutectic solvents, and SUPRAS improves the selectivity and sensitivity of various analytical techniques towards analytes.

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Emerging core-shell nanostructures for surface-enhanced Raman scattering (SERS) detection of pesticide residues

Ting Wang et al.

Summary: Pesticide residues pose a significant threat to human health and the environment, driving the need for rapid and effective detection methods. Core-shell nanostructures as novel SERS substrates have been widely utilized in rapid pesticide detection research. Understanding and monitoring pesticide residues can be improved through the classification and evaluation of different core-shell nanostructures and early-warning analysis.

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Dispersive liquid-liquid microextraction using a low transition temperature mixture and liquid chromatography-mass spectrometry analysis of pesticides in urine samples

Valeria Gallo et al.

Summary: Biomonitoring is an effective tool for controlling health risks in populations exposed to various chemicals. The study presents a new approach using dispersive liquid-liquid microextraction (DLLME) with a low transition temperature mixture as the extraction solvent for analyzing pesticides in urine samples. The method offers advantages in terms of rapidity, simplicity, efficiency, and cost-effectiveness compared to other methods, and has been successfully applied in analyzing urine samples from volunteers.

JOURNAL OF CHROMATOGRAPHY A (2021)

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Article Chemistry, Multidisciplinary

Spontaneous Ouzo Emulsions Coexist with Pre-Ouzo Ultraflexible Microemulsions

Sylvain Prevost et al.

Summary: The study reveals that the spontaneous emulsions produced by dilution with water can be stable over days even without surfactants, polymers, or particles. The Ouzo effect, obtained by rapid dilution from an identified pre-Ouzo domain, involves weak aggregates and a surface layer enriched in a hydrotrope. Investigations show that when the emulsion is stable, coexisting phases are ternary solutions structured at the nanometer scale.

LANGMUIR (2021)

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Application of chemometrics for modeling and optimization of ultrasound-assisted dispersive liquid-liquid microextraction for the simultaneous determination of dyes

Siroos Shojaei et al.

Summary: The study investigated the efficiency of ultrasound-assisted dispersive liquid-liquid microextraction (UA-DLLME) for extracting malachite green (MG) and rhodamine B (RB) dyes from water samples. The method proved to be fast, economical, and simple, with high extraction efficiency and accuracy.

NPJ CLEAN WATER (2021)

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A natural deep eutectic solvent as a novel dispersive solvent in dispersive liquid-liquid microextraction based on solidification of floating organic droplet for the determination of pesticide residues

Laura Carbonell-Rozas et al.

Summary: By utilizing natural deep eutectic solvents (NADES) as extracting solvents, combined with dispersive liquid-liquid microextraction (DLLME-SFO) method, pesticide residues in environmental water and white wine samples were successfully extracted and preconcentrated, achieving high recoveries and low detection limits. This method demonstrates a new application for NADES in sample preparation and highlights its greenness compared to other reported approaches.

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Tuning Composition of Multicomponent Surface Nanodroplets in a Continuous Flow-In System

Jae Bem You et al.

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Yajing Zheng et al.

Summary: Functional materials from microfluidic-based droplet techniques are diverse in sizes, shapes, and components, allowing unprecedented control over interacting cells without the use of complicated devices.

LAB ON A CHIP (2021)

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Article Biochemical Research Methods

Surface nanodroplet-based nanoextraction from sub-milliliter volumes of dense suspensions

Jae Bem You et al.

Summary: The article introduces a green, fast one-step method called nanoextraction for extraction and detection of target analytes from dense suspensions, achieving a limit of detection for a fluorescent model analyte obtained from particle suspension samples. Research shows that high particle concentration in suspension samples does not reduce extraction efficiency.

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Article Materials Science, Multidisciplinary

One-Step Nanoextraction and Ultrafast Microanalysis Based on Nanodroplet Formation in an Evaporating Ternary Liquid Microfilm

Jiasheng Qian et al.

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Direct Immersion Single-Drop Microextraction and Continuous-Flow Microextraction for the Determination of Manganese in Tonic Drinks and Seafood Samples

Leane Santos Nunes et al.

FOOD ANALYTICAL METHODS (2020)

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Integrated Nanoextraction and Colorimetric Reactions in Surface Nanodroplets for Combinative Analysis

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Encapsulated Nanodroplets for Enhanced Fluorescence Detection by Nano-Extraction

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Speeding up biphasic reactions with surface nanodroplets

Zhengxin Li et al.

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Physicochemical hydrodynamics of droplets out of equilibrium

Detlef Lohse et al.

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Hexafluoroisopropanol-based hydrophobic deep eutectic solvents for dispersive liquid-liquid microextraction of pyrethroids in tea beverages and fruit juices

Wenwen Deng et al.

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Emerging Point-of-care Technologies for Food Safety Analysis

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Controlled addition of new liquid component into surface droplet arrays by solvent exchange

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Determination of acrylamide in brewed coffee by dispersive liquid-liquid microextraction (DLLME) and ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS)

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Deep eutectic solvent as a novel disperser in dispersive liquid-liquid microextraction based on solidification of floating organic droplet (DLLME-SFOD) for preconcentration of steroids in water samples: Assessment of the method deleterious impact on the environment using Analytical Eco-Scale and Green Analytical Procedure Index

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Quantitative analysis of glyphosate, glufosinate and AMPA in irrigation water by in situ derivatization-dispersive liquid-liquid microextraction combined with UPLC-MS/MS

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Growth dynamics of surface nanodroplets during solvent exchange at varying flow rates

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SOFT MATTER (2018)

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Dispersive liquid-liquid microextraction coupled with derivatization: A review of different modes, applications, and green aspects

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Dynamic microwave-assisted extraction combined with continuous-flow microextraction for determination of pesticides in vegetables

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Dispersive liquid-liquid microextraction for metals enrichment: A useful strategy for improving sensitivity of laser-induced breakdown spectroscopy in liquid samples analysis

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Ternary composites of nanocellulose, carbonanotubes and ionic liquids as new extractants for direct immersion single drop microextraction

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Implementation of droplet-membrane-droplet liquid-phase microextraction under stagnant conditions for lab-on-a-chip applications

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Headspace single-drop microextraction for the analysis of chlorobenzenes in water samples

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