In Situ Fabrication
of Photoluminescent Hydrogen-Bonded
Organic Framework-Functionalized Ca (II) Hydrogel Film for the Tetracyclines
Visual Sensor and Information Security
posted on 2024-02-14, 12:03authored byGuanghua Li, Sha Liu, Yalan Bian, Ruipeng Chen, Shuang Li, Weijun Kang, Zhixian Gao
A facilely in situ fabricated hydrogen-bonded organic
framework
(HOF) hydrogel film with perfect photoluminescent performance was
designed for visual sensing of tetracycline antibiotics (TCs) and
information security. Luminescent HOF (MA-IPA) was combined with sodium
alginate (SA) through hydrogen bonding actions and electrostatic interactions,
then cross-linked with Ca2+ ions to form HOF hydrogel film
(Ca@MA-IPA@SA). The HOF hydrogel film exhibited exceptional mechanical
robustness along with stable blue fluorescence and ultralong green
phosphorescence. After exposure to TCs, Ca2+ was combined
with TCs to generate a new green fluorescence exciplex (TC-Ca2+) in hydrogel films. Due to fluorescence resonance energy
transfer, the fluorescence of MA-IPA was quenched, and the fluorescent
color of the HOF hydrogel film was changed from blue to green. This
dichromatic fluorescent response is convenient for the visual and
rapid detection of TCs. The detection limits of tetracycline (TC),
oxytetracycline (OTC), and chlortetracycline (CTC) were 5.1, 7.7,
and 32.7 ng mL–1, respectively. Importantly, this
hydrogel sensing platform was free of tedious operation and enabled
the ultrasensitive and selective detection of TCs within 6 min. It
has been successfully applied to TC detection in pork and milk samples.
Based on the stable photoluminescence performance of HOF hydrogel
films and fluorescent-responsive properties to TCs, two types of anticounterfeiting
arrays were fabricated for information encryption and decryption.
This work provides a novel approach for on-site detection of TCs and
offers valuable insights into information security.