Related Experiment Video
Updated: Feb 21, 2026
07:58
A Polyaniline-based Sensor of Nucleic Acids
Published on: November 1, 2016
8.5K
Poly(Ionic Liquid) Based Chemosensors for Detection of Basic Amino Acids in Aqueous Medium
Xinjuan Li1, Kai Wang1, Nana Ma1
1Key Laboratory of Green Chemical Media and Reactions, School of Chemistry and Chemical Engineering, State Education Ministry of China, Henan Normal University, Xinxiang, China.
Frontiers in Chemistry
|October 12, 2017
Summary
Researchers developed novel polymerized ionic liquids (PILs) for naked-eye detection of amino acids (AA) in water. This method offers high sensitivity and selectivity for key amino acids, advancing bioanalytical applications.
Area of Science:
- Analytical Chemistry
- Polymer Science
- Biochemistry
Background:
- Naked-eye detection of amino acids (AA) in aqueous solutions is crucial for bioanalytical applications.
- Existing methods may lack sensitivity, selectivity, or ease of use for real-time monitoring.
- Polymerized ionic liquids (PILs) offer tunable properties for molecular recognition.
Purpose of the Study:
- To synthesize and characterize PILs with controlled chain lengths for AA detection.
- To evaluate the performance of PILs in terms of sensitivity, selectivity, and detection limits for specific AAs.
- To elucidate the mechanisms underlying the biosensitivity of PILs in aqueous media.
Main Methods:
- Synthesis of PILs using reversible addition-fragmentation chain-transfer (RAFT) polymerization.
- Post-quaternization of PILs to introduce charged moieties.
- Evaluation of AA recognition via naked-eye colorimetric changes and UV-vis spectroscopy.
- Investigation of the influence of PIL molecular weight and alkyl chain length on performance.
Main Results:
- PILs with controlled molecular weights were successfully synthesized.
- Highly sensitive and selective naked-eye detection of arginine (Arg), lysine (Lys), and histidine (His) in water was achieved.
- Recognition performance correlated positively with PIL molecular weight.
- Biosensitivity was attributed to aggregation and polarization effects influenced by PIL structure.
Conclusions:
- Controlled RAFT polymerization enables the development of effective PIL-based sensors for amino acid detection.
- The synthesized PILs demonstrate significant potential for sensitive and selective bioanalytical applications in water.
- Understanding the role of molecular weight and aggregation effects is key to optimizing PIL sensor design.
More Related Videos
Related Concept Videos
01:25Basicity of Heterocyclic Aromatic Amines
7.0K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
7.0K
01:15High-Performance Liquid Chromatography: Types of Detectors
1.8K
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
1.8K
01:21Basicity of Aliphatic Amines
7.0K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
7.0K
01:16Titration in Nonaqueous Solvents
1.4K
Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
1.4K
01:18Basicity of Aromatic Amines
8.2K
The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
8.2K
01:15Potentiometry: Membrane Electrodes
1.9K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
1.9K