Recyclable europium functionalized metal-organic fluorescent probe for detection of tryptophan in biological fluids and food products

Zirconium Metal Organic Framework-Based Hybrid Sensors with Chiral and Luminescent Centers Fabricated by Postsynthetic Modification for the Detection and Recognition of Tryptophan Enantiomers

“…The liquid 1 H NMR spectra of l -His, l -Trp, and d -Trp are measured, and the interaction of l -His with d -Trp and l -Trp is studied (Figure S14a). As demonstrated in Figure S14b, compared with the 1 H NMR spectrum of l -His, the chemical shift of l -His after mixing with l -Trp moves to a high field, which is attributed to the increase in electron density caused by the π···π stacking. , On the other hand, the chemical shift of l -His mixed with d -Trp has no obvious change, which confirms that there is a difference in the degree of interaction between l -His and tryptophan enantiomers. It is also the reason why the fluorescence quenching rates of the two enantiomers to Eu@MOF-His are various.…”

“…In contrast, the fluorescent sensor can not only overcome the above-mentioned defects but also has a wide range of applications and strong selectivity. 14,17,18 Metal−organic frameworks (MOFs) are a type of porous material with the characteristics of both organic molecules and inorganic compounds, which has many advantages, such as high stability, structural diversity, and strong designability. 19,20 These fascinating properties make MOFs extremely valuable in the fields of catalysis, 21,22 bioimaging, 23,24 gas storage and separation, 25,26 and so forth.…”

“…However, these analysis methods require complex operation, expensive instruments, and high detection cost and do not have universality. In contrast, the fluorescent sensor can not only overcome the above-mentioned defects but also has a wide range of applications and strong selectivity. ,, …”

A portable test strip fabricated of luminescent lanthanide-functionalized metal–organic frameworks for rapid and visual detection of tetracycline antibiotics

“…[25][26][27][28][29] To date, Ln-MOFs have been reported to detect a variety of metal ions, [30][31][32][33][34] anions, 35,36 and biosignaling molecules. [37][38][39] Nevertheless, it must be considered that most studies on Ln-MOFs have been performed in a laboratory setting and are not practical for rapid and on-site visualization-based detection of TCs in actual samples. Therefore, developing real-time detection based on portable devices has been considered as the key point in the analytical eld.…”

A Review of Sensors and Biosensors Modified with Conducting Polymers and Molecularly Imprinted Polymers Used in Electrochemical Detection of Amino Acids: Phenylalanine, Tyrosine, and Tryptophan

“…Over the years, many scientific researchers have developed numerous methods through which these AAs can be detected rapidly and precisely, both in biological and in pharmaceutical products. From among these methods, mention must be made of the classical high-performance liquid chromatography (HPLC) [1][2][3][4][5], mass spectrometry [6][7][8][9], fluorimetry [10], colorimetry [7,11,12], chemiluminescence [13][14][15], Raman spectroscopy [16,17], UV-Vis spectroscopy [18], capillary electrophoresis [19][20][21], and atomic force spectroscopy [22]. Moreover, versatile methods for detecting AAs have been developed and used: electrochemical ones based on sensors and biosensors, which use cyclic voltammetry (CV) [23][24][25][26][27][28] as a detection method, chronoamperometry (CA) [29], differential pulse voltammetry (DPV) [30][31][32], square wave voltammetry (SWV) [33][34][35], and linear sweep voltammetry (LSV) [36,37].…”