Canadian Journal of Chemistry
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2017
·Vol. 96
·期 1
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IF 1.08
Guoqiang Xiang,Yue Ren,Heng Zhang,Huanhuan Fan,Xiuming Jiang,Lijun He,Wenjie Zhao
A simple and effective strategy for designing a ratiometric fluorescent nanosensor was described. A carbon dots (CDs) based dual-emission nanosensor for chromium speciation analysis was developed by coating CDs on the surface of dye-doped silica nanoparticles. The fluorescence of the resulting dual-emission silica nanoparticles was quenched in acetic acid through potassium bromate (KBrO3) oxidation. Cr(VI) was able to catalyze KBrO3 oxidation, resulting in ratiometric fluorescence accelerated quenching response of the dual-emission silica nanoparticles. Several important parameters affecting the nanosensor performance, including acid type, concentrations of KBrO3, and reaction temperature and time were examined. Under the optimized conditions, the detection limit of the nanosensor towards Cr(VI) reached 1.3 ng mL−1, and pretty good linearity was obtained between 20 to 500 ng mL−1. More importantly, the sensor was found suitable for speciation analysis of both Cr(III) and Cr(VI) in different water samples with satisfactory results.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Qiusha Li,Shuzhen Peng,Yun Chang,Mujing Yang,Dandan Wang,Xiaoshun Zhou,Yong Shao
G-triplex (G3), as an intermediate of G-quardruplex (G4), is a typical non-classical DNA topology with three G-tracts, formed by folding guanine-riched DNA sequences. The flexibility and tunability of G3-folding structures can provide a versatile platform for analytes sensing. However, current researches about G3s on sensing applications, especially on metal ion sensing, are relatively rare. Herein, we first develop a label-free fluorescence switch-on sensing platform based on the G-triplex topology (HtG3) for the specific qualitative identification of chromium species. Coralyne (COR), a molecule probe whose fluorescence can be inhibited by HtG3, is employed to monitor the Cr 3+ binding events with the principle that Cr 3+ could break the parallel HtG3-folding structure to result in COR releasing from HtG3 and its fluorescence recovery. Furthermore, this HtG3 sensing platform we constructed also can be used to indirectly identify CrO 4 2- through reducing it to Cr 3+ with ascorbic acid (AA). Our work will extend the practical application of G3 as a biosensor and inspire wide interests in exploring more non-classical DNA structures.
研究领域:
分析化学
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生物传感器
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材料科学
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DOI
高影响因子
Energy Technology
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2017
·Vol. 6
·期 9
·1633-1641
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IF 2.789
Fei Li,Guang Zhang,Yinghua Song
Herein, a facile method for constructing acid-base and Cr III species multi-functionalized multi-walled carbon nanotubes (CNTs) catalyst was reported. Acid and base, i.e., −SO 3 H and −NH 2 groups, were first grafted on CNTs to synthesize CNTs−SO 3 H−NH 2 bi-functional catalyst. Then the obtained CNTs−SO 3 H−NH 2 catalyst was further functionalized with Cr III species for further enhancement of acidity. The catalytic activity of fabricated catalysts were systematically studied for the one-pot conversion of cellulose to 5-hydroxymethylfurfural (HMF) in an ionic liquid solvent system. Results indicated that in the one-pot cellulose to HMF reaction, acidic sites were necessary for dissolved cellulose hydrolysis and fructose dehydration process, and the isomerization of glucose to fructose can be regarded as rate determining step. Co-existed base and Lewis acid sites were found to promote glucose isomerization to fructose, and Brønsted acid sites direct the dehydration of reactively formed fructose to HMF. And under the optimal conditions, the highest HMF yield of 40.2 % was achieved by multi-functional CNTs−SO 3 H−NH 2 −Cr III catalyst. Moreover, the fabricated catalyst in this study revealed excellent stability for recycle use in HMF production from cellulose.
研究领域:
化学工程
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材料科学
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可再生能源
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Ningyi Chen,Shuang Wu,Ying Xu,Sijie Lv,Xianhua Wang,Qingrui Zhang,Bingjun Pan
High-resolution identification of chromium (Cr) species, especially various organic-Cr complexes, in a convenient and economically-feasible manner is the prerequisite for achieving the advanced treatment of chromium wastewater. To this end, a colorimetric nano-Au sensor array was developed by taking advantage of the UV-spectra shift of gold nanoparticles (Au NPs) upon interaction with Cr species; specifically, four molecular modifiers [i.e., iminodiacetic acid (IDA), tripolyphosphate (TPP), cetyltrimethylammonium bromide (CTAB), and 1,5-diphenylcarbazide (DPC)] were intentionally employed for assembling nano-Au array receptors, which showed respective responses toward different Cr species through the formation of coordination, hydrophobic interaction, electrostatic attraction, and redox reaction , respectively; the “fingerprint” differences of the unique optical properties were then integrated for semi-quantitatively recognizing Cr species by pattern recognition techniques. Eleven ubiquitous Cr species [i.e., Cr(III), Cr(VI), and various Cr(III)-organic complexes] served as the model samples, which could be sensitively identified, no matter in individual or mixture mode, by the developed nano-Au sensor array on the basis of the colorimetric responses resulted from diverse nano-Au-aggregation behaviors, with excellent anti-interference ability in the simulated or actual water scenario. Attractively, the nano-Au sensor array can achieve very sensitive detection limit of the quantitative analyses of Cr species in a prompt in-situ manner, which usually requires a two-step process of separation and detection for the conventional analytical methods. Such a convenient strategy of Cr species discrimination conduces to rationally designing specific protocols for the advanced treatment of chromium wastewater.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
BIOMETALS
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2023
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IF 3.5
Li Ye,Ma Yanxuan,Mu Chunyu,Gu Jiali,Li Zimu
The binding process between three species of chromium and serum albumin (SA) was investigated, as well as the interaction between K 2 Cr 2 O 7 and bovine serum albumin (BSA) under coexistence of different chromium forms. CrCl 3 , K 2 Cr 2 O 7 and Crpic bound to SA spontaneously through Van der Waals force, and their binding constants were 10 3 –10 4 M −1 at 298 K, respectively. K 2 Cr 2 O 7 and Crpic both had strong binding affinity for BSA, and significantly affected the secondary structure of BSA and the microenvironment surrounding amino acid residues. Chromium exhibited a greater fluorescence quenching constant towards HSA than toward BSA, and K 2 Cr 2 O 7 induced greater conformational changes in human serum albumin (HSA) than in BSA. A weak binding of CrCl 3 to BSA had no significant effect on the binding affinity of K 2 Cr 2 O 7 to BSA. K 2 Cr 2 O 7 and BSA have a greater binding affinity when coexisting with Crpic, and K 2 Cr 2 O 7 induces a greater conformational change in BSA.
研究领域:
化学
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生物化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
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