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Ratiometric Detection of Propyl Gallate Based on Two Zn(II)-Tb(III) Coordination Polymers Modulated by Metal-Ligand
Fang-Hua Zhao1, Shu-Qi Li1, Zhan-Peng Song1
1Key Laboratory of Life-Organic Analysis of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China.
Inorganic Chemistry
|April 3, 2026
Summary
Researchers developed novel coordination polymers for accurate propyl gallate (PG) detection. These materials offer a sensitive and selective method for identifying PG, enhancing food safety. This advancement is crucial for monitoring antioxidant levels in food products.
Area of Science:
- Materials Science
- Analytical Chemistry
- Food Science
Background:
- Propyl gallate (PG) is a widely used food antioxidant.
- Excessive PG consumption may pose health risks.
- Accurate PG detection methods are essential for food safety.
Purpose of the Study:
- To synthesize novel heterometallic coordination polymers (CPs).
- To develop a ratiometric fluorescence sensor for PG detection.
- To establish a portable detection platform for PG in food samples.
Main Methods:
- Synthesis of two heterometallic Zn(II)-Tb(III) coordination polymers (CPs) with varying metal-ligand ratios.
- Characterization of CP structures and dual-emission properties.
- Development of a ratiometric fluorescence sensing method for PG detection.
- Establishment of a smartphone-integrated RGB analysis platform.
Main Results:
- Two distinct 0D + 1D ionic pair CPs, {[Zn(tpy)2][Tb3(DCA)11]·H2O}n (1) and {[Zn(tpy)2][Tb4(DCA)14]}n (2), were synthesized.
- CPs exhibited intrinsic dual-emission and acted as selective ratiometric fluorescence sensors for PG.
- Low detection limits (0.38 μM for 1, 0.35 μM for 2) were achieved.
- Successful PG detection in edible oil samples with good recovery rates.
Conclusions:
- The synthesized heterometallic CPs are effective ratiometric fluorescence sensors for PG.
- The developed method offers high selectivity, anti-interference, rapid response, and recyclability.
- The smartphone-based platform enables portable and on-site PG detection.
- These CPs show significant potential for ensuring food safety.
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