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Published on: August 17, 2016
A Dual-Responsive Julolidine-Barbituric Acid Platform for Environmental Hydrazine Detection
Ramalingam Manivannan1, Palanisamy Jayasudha1, Yoon Woo Choi1
1Department of Advanced Organic Materials Engineering, Chungnam National University, 220 Gung-dong, Yuseong-gu, Daejeon, 305-764, South Korea.
Journal of Fluorescence
|July 21, 2026
Summary
A new Julolidine-barbituric acid-based fluorescent chemosensor (JB) offers sensitive and selective detection of toxic hydrazine hydrate. This cost-effective sensor enables rapid, on-site environmental monitoring.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Hydrazine is a toxic and carcinogenic compound requiring sensitive detection for safety.
- Existing detection methods for hydrazine hydrate can be limited in sensitivity, selectivity, or portability.
- There is a need for efficient and rapid monitoring tools for environmental and industrial safety.
Purpose of the Study:
- To design and synthesize a novel fluorescent chemosensor for selective hydrazine hydrate detection.
- To evaluate the sensor's selectivity, sensitivity, and response mechanism.
- To demonstrate the practical applicability of the sensor for real-world environmental monitoring.
Main Methods:
- Synthesis of a Julolidine-barbituric acid-based fluorescent chemosensor (JB) using Knoevenagel condensation.
- Spectroscopic analysis (UV-Vis, fluorescence, 1H-NMR, HRMS) to characterize the sensor and elucidate the sensing mechanism.
- Testing selectivity against common interfering analytes and assessing sensitivity via limit of detection (LOD) determination.
- Application testing using JB-coated paper strips and analysis of real soil samples.
Main Results:
- The JB sensor exhibited high selectivity for hydrazine hydrate, showing a visible color change (orange to colorless) and fluorescence shift (yellow to blue) with enhanced emission.
- A linear response was observed in the concentration range of 0–2.0 × 10⁻⁵ M.
- The limits of detection were determined as 7.78 × 10⁻⁶ M (UV-Vis) and 508 nM (fluorescence), indicating high sensitivity.
- Mechanism confirmed as hydrazine-induced nucleophilic cleavage of the conjugated system.
- Successful application demonstrated on paper strips for on-site detection and in real soil samples.
Conclusions:
- The novel Julolidine-barbituric acid-based fluorescent chemosensor (JB) provides a sensitive, selective, and rapid method for hydrazine hydrate detection.
- The sensor's mechanism involves nucleophilic cleavage, confirmed by spectroscopic techniques.
- JB offers a cost-effective, portable, and efficient platform for real-time environmental monitoring of hydrazine hydrate.
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