Blue-light emitting aminated pectin for detecting Cu²⁺ ion.

Area of Science:

• Materials Science
• Analytical Chemistry
• Biochemistry

Background:

• Pectin modification is crucial for advanced applications.
• Amination enhances pectin properties like crystallinity and solubility.
• Developing cost-effective and efficient chemosensors is a key research area.

Purpose of the Study:

• To synthesize aminated pectin (PE) using a facile, low-temperature calcination method with ammonia gas.
• To investigate the chemo-sensing capabilities of the modified pectin for detecting metal ions, particularly Cu2+ and Fe3+.
• To enhance the photoluminescence (PL) quenching efficiency and selectivity for Cu2+ detection.

Main Methods:

• Facile calcination of pectin under ammonia gas at ≤175°C.
• Characterization of aminated pectin properties (crystallinity, solubility, light absorption).
• Photoluminescence (PL) quenching studies for Cu2+ and Fe3+ detection.
• Optimization of PL quenching using H2O2 and UV illumination.

Main Results:

• Aminated pectin (PE) synthesized with enhanced crystallinity and solubility compared to conventionally treated pectin.
• Blue fluorescent aminated pectin demonstrated linear PL quenching with Cu2+ and Fe3+ concentrations.
• Highest sensitivity was observed for Cu2+ detection.
• A method using H2O2 and UV light improved Cu2+ quenching and reduced Fe3+ interference.

Conclusions:

• Low-cost aminated pectin is a promising material for selective and sensitive chemo-sensing of metal ions.
• The N-incorporation and structural modifications are key to the photoluminescent properties.
• The developed method offers a new pathway for pectin modification and its application in chemosensing.