A Facile Strategy for the Preparation of Carboxymethylcellulose‐Derived Polymer Dots and Their Application to Detect Tetracyclines

Abstract

Developing nonconjugated fluorescent polymer dots based on cellulose materials through a simple and economical method is of high value for sensing or imaging. However, great challenges are still being suffered. Herein, strong blue‐green emission water‐soluble cellulose polymer dots (CPDs) are synthesized with excellent stability using carboxymethyl cellulose (CMC) and citric acid (CA) as precursors via a mild reaction and facile synthesis process. Near‐spherical nanoparticles with an average size of approximately 11.3 nm and quantum yield of 11.5% are obtained. Importantly, CPDs can be utilized as an excellent fluorescent probe for the detection of tetracyclines (TCs) in aqueous solutions through fluorescence quenching via the inner filter effect. The detection limit for fluorescent CPDs for TC detection is found to be as low as 4.1 × 10‐9 m, and two good linear relationships for TC concentration ranging from 51.8 × 10‐9 to 256.8 × 10‐9 m (R2 = 0.996) and 0 × 10‐6 to 15.3 × 10‐6 m (R2 = 0.997) are obtained. Finally, the fluorescent CPD fluorescent probe is successfully utilized to detect TC in real samples, including tap water, milk, and river water.

Polymer-Derived Carbon Nanofiber and Its Photocurrent-Switching Responses of Carbon Nanofiber/Cu Nanocomposite in Wide Ranges of Excited Light Wavelength

“…Therefore, the preparation and tailoring of carbon dots showed diverse selection for different applications because of abundant precursors (containing carbon resources). Some representative studies are as follows: Zhang and co-workers [6] prepared carboxymethyl cellulose-derived polymer dots and used it to detect tetracyclines. Bazazi and co-workers [7] introduced polysaccharide-based carbon dots and polysaccharide/carbon-dots nanocomposites.…”

Fluorescein-Functionalized Conjugated Polydiacetylenes with Excellent Reversible Thermochromic Properties under Thermal and 980 nm Near-Infrared Light Stimuli

“…In nature, chromism is a significant phenomenon found in many biological systems, such as chameleons, Kallima inachus, Pacific tree frogs, and octopuses, which can adjust the colors of the skin in response to external stimuli. , Therefore, scientists have been inspired by enormous interest in the development of stimulus-responsive colorimetric materials. Among these materials, conjugated polymers have been widely investigated owing to their extensively delocalized π-electron networks as well as unique optical and electric properties. − The special structures endow the conjugated material with excellent sensitive properties to environmental stimuli, which make them ideal candidates in the design of chemical and biological sensors. − …”

A New Cellulose-Based Fluorescent Probe for Specific and Sensitive Detection of Cu2+ and Its Applications in the Analysis of Environmental Water

“…Carboxymethyl cellulose (CMC), as a kind of water-soluble natural polymer, is usually found in the form of sodium salts with the advantages of excellent biocompatibility, nontoxicity, good biodegradability and easy modification [ 20 ]. Due to the presence of many active oxygen-containing groups (carboxyl and hydroxyl), CMC is also an ideal carrier in the field of multifunctional modifications and constructing diverse fluorescent materials [ 21 , 22 , 23 , 24 ], For example, Fan prepared fluorescent hydrogels and aerogel hybrid materials by covalent coordination of lanthanide ions (Eu 3+ or Tb 3+ ) with carboxyl groups of CMC, which can be used to the detection of Fe 3+ [ 23 ]. Ye synthesized a fluorescent probe CMC/Tb(III) for detecting Mn 2+ in aqueous solution [ 24 ].…”