Yellow emission N-doped fluorescent carbon dots as fluorescent nanoprobes for the detection of L-threonine in real samples

Abstract

L-threonine, as a methylamino acid with side chains forming hydrogen bonds and nonpolar interactions, is an important amino acid in cosmetics, foods, and veterinary drugs. However, up to now, there...

Machine learning guided microwave-assisted quantum dot synthesis and an indication of residual H2O2 in human teeth

“…3(a)) shows a clear crystal lattice with a lattice fringe distance of 0.21 nm, which corresponds to the (100) lattice plane of graphite carbon. 46 The X-ray diffractometer (XRD) pattern of the CDs (Fig. 3(c)) displays a broad peak centered at ∼18°, which may be related to the small size of the CDs.…”

“…The peak at 3445 cm −1 is attributed to the –OH/–NH group, which gives them high solubility in water. 46 The –NH and CN stretching vibrations (at about 3445 and 1642 cm −1 ) indicate that there are a huge number of –NH groups on the surface of CDs. 49,50 The peak at 1725 cm −1 is attributed to the CO stretching vibration due to abundant hydroxyl groups in the precursor, 43 and the peak at 1650 cm −1 is a direct result of N–H and –COO stretching vibrations.…”

Recent developments in carbon dot-based green analytical methods: new opportunities in fluorescence assays of pesticides, drugs and biomolecules

“…The developed SNCD-based analytical device was demonstrated to detect bilirubin in spiked urine and human serum samples. Zhu et al 152 prepared yellow emissive CDs via a hydrothermal method for the detection of l -threonine. The detection of l -threonine was based on the fluorescence quenching via the FRET mechanism.…”

Mn3+/Mn4+ ion-doped carbon dots as fenton-like catalysts for fluorescence dual-signal detection of dopamine

“…In recent years, researchers have developed a variety of fluorescent materials, including AIE dyes, upconversion nanoparticles, fluorescent metal nanoclusters, carbon dots (CDs), and other fluorescent materials (Wang et al, 2010;Tu and Wang, 2013;Yang et al, 2015;Anjali Devi et al, 2017;Luo et al, 2019). Therein, CDs are widely used in biosensing and bioimaging due to their excellent photostability and biocompatibility (Xu et al, 2021;Liu et al, 2013;He et al, 2018). For example, Xu et al constructed a fluorescence resonance energy transfer (FRET) detection platform based on the synthesized yellow fluorescent CDs.…”

“…For example, Xu et al constructed a fluorescence resonance energy transfer (FRET) detection platform based on the synthesized yellow fluorescent CDs. This platform had high selectivity and sensitivity, and could specifically detect L-threonine in samples with the detection range of 0.1-0.5 mM (Xu et al, 2021). Based on the FRET effect, Liang et al prepared a novel hybrid proportional fluorescence probe of CDs-gold nanoclusters that could detect DA in the 5-180 nM range (He et al, 2018).…”