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A nitrogen-doped hollow carbon nanospheres-based aptasensor for non-invasive salivary detection of progesterone
In this study, an ultrasensitive electrochemical aptasensor is fabricated for monitoring P4 in human biofluids. The sensing interface was designed based on the porous nitrogen-doped hollow carbon spheres (N-HCSs). The N-HCSs covalently immobilized high-dense aptamer (Apt) sequences as the bioreceptor of P4. The electron transfer of the redox probe was hindered by incubating P4 on the aptasensor surface and forming the P4-Apt complexes. Meanwhile, the signaling was decreased under two wide linear dynamic ranges (LDRs) from 10 fM to 5.6 μM with a limit of detection (LOD) value of 3.33 fM. The aptasensor presented satisfacto...
Source: Talanta - March 23, 2024 Category: Chemistry Authors: Mahsa Ghanbarzadeh Ali Ghaffarinejad Faezeh Shahdost-Fard Source Type: research

Combined fabrication of zeolitic imidazolate framework-8 and lanthanide towards coordination polymers: A dual-signal fluorescent probe for sensing Cu 2+ based on synergistic e ﬀect of aggregation-induced emission and antenna effect
Talanta. 2024 Mar 18;273:125941. doi: 10.1016/j.talanta.2024.125941. Online ahead of print.ABSTRACTCopper ion (Cu2+) detection remains an important task for monitoring water quality because of its specific toxicity. Herein, a new dual-signal fluorescent probe was developed by combining zeolitic imidazolate framework-8 (ZIF-8) and lanthanide for the detection of Cu2+ for the ﬁrst time. The lanthanide coordination polymer (guanosine monophosphate and Eu3+, GMP/Eu) was initially incorporated into ZIF-8 to yield ZIF-8/GMP/Eu nanomaterials with extremely weak single emission fluorescence at 618 nm. It was found that the resul...
Source: Talanta - March 22, 2024 Category: Chemistry Authors: Yanmei Si Yanli Li Jianli Guo Hua Wang Xinfang Wang Jia Fu Source Type: research

Ultrasensitive detection of tyrosinase with click reaction-combined dark-field imaging platform
In this study, we developed an ingenious and powerful method for the ultrasensitive detection of TYR by click reaction-combined dark-field microscopy. This method begins with the formation of cuprous ions (Cu+) based on the reduction of copper ions (Cu2+) by ascorbic acid (AA). Subsequently, the formed Cu+ can catalyze the crosslinking between azide- and alkyne-functionalized gold nanoparticles, causing a significant red-shift in the scattering spectrum. However, AA can chelate with TYR, which inhibits the generation of Cu+ and subsequent click reaction, thus achieving TYR-controlled scattering spectral shift. The proposed...
Source: Talanta - March 22, 2024 Category: Chemistry Authors: Zi-Yue Jin Cai-Hong He Cheng-Ye Xi Yi Wang Eshtiag Abdalla Bin-Bin Chen Da-Wei Li Source Type: research

Development and validation of a versatile non-invasive urinary steroidomics method for wildlife biomonitoring
This study presents a validated steroidomics method for the (un)targeted screening of a wide range of sex and stress steroids and related molecules in urine using ultra-high performance liquid chromatography coupled to high-resolution mass spectrometry (UHPLC-HRMS). In total, 50 steroids (conjugated and non-conjugated androgens, estrogens, progestogens and glucocorticoids) and 6 prostaglandins could be uniquely detected. A total of 45 out of 56 compounds demonstrated a detection limit below 0.01 ng μL-1. Excellent linearity (R2 > 0.99), precision (CV < 20 %), and recovery (80-120 %) were observed for 46, 41, and 39 ...
Source: Talanta - March 22, 2024 Category: Chemistry Authors: Tom Cools Kirsten S Wilson Desheng Li Catherine Vancsok Baptiste Mulot Antoine Leclerc Jos é Kok Marko Haapakoski Mads F Bertelsen Andreas Ochs Simon J Girling Yingmin Zhou Rengui Li Lynn Vanhaecke Jella Wauters Source Type: research

An electrochemiluminescence sensor based on lanthanide bimetallic MOFs with a "cascade sensitization mechanism" for the sensitive detection of CA242
Talanta. 2024 Mar 21;273:125956. doi: 10.1016/j.talanta.2024.125956. Online ahead of print.ABSTRACTLanthanide metal-organic frameworks (Ln-MOFs) broaden the optical sensing applications of lanthanide ions due to the antenna effect between organic ligands and metals. However, the sensitization ability of the ligand to metal ions is limited, and maximizing the sensitization of the electrochemiluminescence behavior of Eu3+ is still a challenge for the application of Ln-MOFs. Therefore, under the guidance of the "cascade sensitization mechanism" based on the antenna effect sensitizing the electrochemiluminescence of bimetallic...
Source: Talanta - March 22, 2024 Category: Chemistry Authors: Fengqian Xie Chaoqun Shen Xinli Li Ping Xiao Shujun Wang Yueyuan Li Hongzhen Sun Ping Wang Yueyun Li Qing Liu Source Type: research

A luminescent organic cocrystal for detecting 2,4-dinitroaniline
This study not only provided an environmentally friendly gram-level preparation strategy to synthesize the fluorescent material but also investigated their application in chemical detection.PMID:38513470 | DOI:10.1016/j.talanta.2024.125919 (Source: Talanta)
Source: Talanta - March 21, 2024 Category: Chemistry Authors: Yanxiong Liu Ruiying Zhang Na Zou Hao Li Xin Hu Wenwen Fan Yi Cheng Li-Yan Zheng Qiu-E Cao Source Type: research

Development of reusable electrochemiluminescence sensing microchip for detection of vomitoxin
Talanta. 2024 Mar 19;273:125942. doi: 10.1016/j.talanta.2024.125942. Online ahead of print.ABSTRACTIn this work, a reusable DNA sensing microchip was developed for detection of vomitoxin (deoxynivalenol, DON) in sorghum using Cd-based core-shell CdSe@CdS quantum dots (QDs) as promising electrochemiluminescence (ECL) emitter. The size-adjustable aqueous phase CdSe@CdS QDs were prepared through homogeneous method, exhibiting strong cathodic ECL emission with a central wavelength of 520 nm in S2O82- coreactant. And gold nanoparticles-modified iron cobalt cyanide hydrate (Fe-Co-Au) was introduced as an accelerator to amplify t...
Source: Talanta - March 21, 2024 Category: Chemistry Authors: Huan Wang Yue Jia Tao Feng Bing An Hongmin Ma Xiang Ren Nuo Zhang Faying Li Qin Wei Source Type: research

Fabrication of a novel HKUST-1/CoFe 2 O 4 /g-C 3 N 4 electrode for the electrochemical detection of ciprofloxacin in physiological samples
Talanta. 2024 Mar 20;273:125882. doi: 10.1016/j.talanta.2024.125882. Online ahead of print.ABSTRACTIn this work, a novel HKUST-1/CoFe2O4/g-C3N4 electrode was successfully prepared via the hydrothermal method and the high-temperature calcination method, which can be applied as an electrochemical sensor for the precise detection of ciprofloxacin (CIP) in physiological samples. The novel electrode was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR), and its electrochemical performance was further evaluated via the cyclic voltammetry (CV) and diff...
Source: Talanta - March 21, 2024 Category: Chemistry Authors: Rui Liu Chaojun Zhang Tianheng Wu Rijia Liu Yuan Sun Jing Ma Source Type: research

Glutathione ligand self-assembly enables luminescence from Au 15 nanoclusters for highly sensitive and selective monitoring of blood Pb(II) ions
Talanta. 2024 Mar 11;273:125905. doi: 10.1016/j.talanta.2024.125905. Online ahead of print.ABSTRACTLead Pb(II) ions is a cumulative toxicant that impacts several biological systems and poses severe harm to young children. Accurate Pb(II) ions monitoring is thus of paramount importance. Here, we present the synthesis and application of glutathione-capped Au15 nanoclusters (Au15(SG)13) as a luminescence probe for the accurate and selective monitoring of blood Pb(II). The introduction of Pb(II) ions triggers orderly self-assembly of Au15 nanoclusters, resulting in the formation of rigid shell around Au nuclei. This limits the...
Source: Talanta - March 21, 2024 Category: Chemistry Authors: Chang Yuan Zhanjun Guo Shubo Tian Ningning Song Minmin Liang Source Type: research

A dual-core 3D DNA nanomachine based on DNAzyme positive feedback loop for highly sensitive MicroRNA imaging in living cells
Talanta. 2024 Mar 20;273:125952. doi: 10.1016/j.talanta.2024.125952. Online ahead of print.ABSTRACTA double 3D DNA walker nanomachine by DNAzyme self-driven positive feedback loop amplification for the detection of miRNA was constructed. This method uses two gold nanoparticles as the reaction core, and because of the spatial confinement effect the local concentration of the reactants increase the collision efficiency was greatly improved. Meanwhile, the introduction of positive feedback loop promotes the conversion efficiency. In presence of miRNA-21, a large amount of DNAzyme was released and hydrolyze the reporter probe,...
Source: Talanta - March 21, 2024 Category: Chemistry Authors: Jinshen Li Shixiu Xiao Xin Wang Xiaomei Mu Shulin Zhao Jianniao Tian Source Type: research