Polydiacetylene-based colorimetric and fluorometric sensors for lead ion recognition

Abstract

In this study two colorimetric and fluorometric sensors were prepared for lead ions based on conjugated polydiacetylenes.

Highly Sensitive Colorimetric Ammonia Sensors Based on Polydiacetylene/Zinc Oxide Nanopellet-Embedded PDMS Films for Meat Spoilage Detection

“…Polydiacetylene (PDA) is one of the promising materials for colorimetric sensing applications owing to its ability of blue-to-red color transition upon exposure to environmental stimuli such as pH, − temperature, , ions, and volatile organic compounds. − The color change of PDA relies on the conformational changes in the PDA backbone and side chain from planar to nonplanar after disturbance by external stimuli. − These structural changes cause the widening of the electronic states of the conjugated backbone, leading to the blue shift of the absorption band. One of strategies to enhance the colorimetric sensitivity of the PDA-based sensor is the chemical modification of PDA side chains by attaching nanomaterials such as metal oxides − and metal nanoparticles. , These composite materials not only change the strength of intrachains but also influence the interchain interactions.…”

“…Therefore, the development of low cost, simple-to-use, reliable, and intuitive colorimetric sensors is of great interest for real-time and onsite monitoring of food spoilage. 16−18 Polydiacetylene (PDA) is one of the promising materials for colorimetric sensing applications owing to its ability of blue-tored color transition upon exposure to environmental stimuli such as pH, 19−21 temperature, 22,23 ions, 24 and volatile organic compounds. 25−27 The color change of PDA relies on the conformational changes in the PDA backbone and side chain from planar to nonplanar after disturbance by external stimuli.…”

Alendronate-Modified Polydiacetylene (PDA) Dual-Mode Sensor for the Selective Detection of Lead(II) Ions up to the nM Level in Solutions and Agarose Films

“…57 However, the dipicolyl unit has been reported to form a complex with other metal ions such as Fe 3+ and Zn 2+ , compromising the selectivity of the sensing system. 63,64 Likewise, PDA-based probes incorporating aza-crown ether 58 and thymine-1-acid 59 as the recognition unit for Pb 2+ ions exhibit similar limitations due to the possibility of complex formation with various other metal ions. 65−67 Other PDAbased probes often exhibit poor sensitivity or require an expensive solid matrix for solid-phase sensing.…”

“…So far, a diverse array of PDA-based sensors has been developed for the detection of various metal ions, , anions, organic solvents, − surfactants, , enzymes, , proteins, , and viruses . PDA-based colorimetric sensors are also designed for the detection of Pb 2+ ions (Figure ). − For example, Yoon and co-workers reported a dipicolyl amine-modified PDA probe for the detection of Pb 2+ ions . However, the dipicolyl unit has been reported to form a complex with other metal ions such as Fe 3+ and Zn 2+ , compromising the selectivity of the sensing system. , Likewise, PDA-based probes incorporating aza-crown ether and thymine-1-acid as the recognition unit for Pb 2+ ions exhibit similar limitations due to the possibility of complex formation with various other metal ions. − Other PDA-based probes often exhibit poor sensitivity or require an expensive solid matrix for solid-phase sensing.…”

“…PDA-based colorimetric sensors are also designed for the detection of Pb 2+ ions (Figure ). − For example, Yoon and co-workers reported a dipicolyl amine-modified PDA probe for the detection of Pb 2+ ions . However, the dipicolyl unit has been reported to form a complex with other metal ions such as Fe 3+ and Zn 2+ , compromising the selectivity of the sensing system. , Likewise, PDA-based probes incorporating aza-crown ether and thymine-1-acid as the recognition unit for Pb 2+ ions exhibit similar limitations due to the possibility of complex formation with various other metal ions. − Other PDA-based probes often exhibit poor sensitivity or require an expensive solid matrix for solid-phase sensing. Molecules bearing phosphate group exhibit a strong affinity for lead ions and are frequently utilized in the detection and removal of lead ions. , Herein, we report the design and development of a selective and sensitive sensor for Pb 2+ ions based on the high affinity of lead ions with a phosphate group.…”