JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Zhengjun Cheng,Yucong Fan,Lei Zhang,Chen Wang
A water-soluble, stable, simple, and dual ligands (bovine serum albumin and lysozyme) and Ag doping co-enhanced Au nanoclusters (Lys/BSA-Ag/AuNCs) was synthesized by one-step wet chemical synthesis. The introduction of Lys-and Ag could improve significantly the quantum yields of AuNCs (QYs, 2.54% to 12.73%). A new ratio fluorescent probe (RF-probe) was successfully obtained for sensitively and selectively mensurating 4-hexylresorcinol (4-HR) and Cr 6+ . That is, the fluorescence (FL) intensity of nanoclusters at 610 nm was used as the built-in reference, while dopamine (DA) reacting with 4-HR could produce a new fluorescent substance, and its FL intensities at 490 nm were enhanced gradually with increasing the concentrations of 4-HR. On the other hand, Cr 6+ will react with DA and consume the amount of DA reacting with 4-HR, resulting in the weakening of FL intensity at 490 nm, so the ratiometric fluorescence detection of Cr 6+ was also realized. The contents of 4-HR and Cr 6+ could be monitored by the RF-probe with linear ranges of 1.0–140.0 and 3.0–110.0 nM, and corresponding values of LOD (limit of detection) were calculated to be 0.16 and 0.37 nM (3σ/slope). Moreover, the proposed method was extended to the detections 4-HR and Cr 6+ in practical samples, and the results were consistent with those of the standard HPLC and UV–vis spectrophotometric methods. In addition, Lys/BSA-Ag/AuNCs exhibited an excellent temperature sensing performance in the range of 10.0–64.0 ℃.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2023
·Vol. 33
·期 3
·849-858
·
IF 2.7
Hu Qingqing,Yu Weihua,Fan Yucong,Kuang Jianhua,Cheng Zhengjun
In the study, silicon doped carbon quantum dots (Si-CQDs) was prepared by one-pot hydrothermal method with (3-aminopropyl) triethoxysilane (APTES) and o-phenylenediamine (OPD) as raw materials. Then a new ratiometric fluorescent probe (RF-probe) was successfully established for sensitively and selectively monitoring proanthocyanidins (PAs) with a linear range of 10–500 nM and limit of detection (LOD) of 5.6 nM. that is, the fluorescence (FL) intensity of Si-CQDs at 570 nm was used as the built-in reference, while dopamine (DA) reacting with 4-hexylresorcinol (4-HR) could produce a new fluorescent substance (named as azamonardine, AZMON), and its FL intensity at 480 nm was reduced because Cr(VI) could oxidize DA to generate quinone without fluorescence. In the presence of PAs, Cr(VI) was reduced to Cr(III), which caused that the amount of DA reacting with 4-HR was increased, thus the FL intensity of AZMON was recovered. Furthermore, the RF-probe was successfully used for the determination of PAs in black goji berry from two different areas and PAs capsule with satisfactory results compared to the standard HPLC method.
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PubMed
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ACS Nano
·
2020
·
IF 14.588
Guangyu Chu,Chunlei Zhang,Yifei Liu,Zanxia Cao,Lirui Wang,Yunfeng Chen,Wenjie Zhou,Guo Gao,Kan Wang,Daxiang Cui
The development of modular strategies for programming self-assembled supramolecular architectures with distinct structural and functional features is of immense scientific interest. We reported on the intrinsic antibacterial capability of anionic amphiphilic gold nanoclusters (GNCs) capped by para-mercaptobenzoic acid, which was closely related to the protonation level of terminal carboxylate groups. By using of the metal–ligand coordination-driven and solvent evaporation-induced self-assembly, we constructed GNCs-based mixed-metal metal–organic network (MM-MON) films on titanium disks as antibacterial nanocoatings. Taking the reasonable utilization of tetravalent metal ions M4+ (Ti, Zr, Hf; hard Lewis acid) and bactericidal divalent metal ions M2+ (Cu, Zn; borderline acid) co-incorporated metal–carboxylate coordination bonds, the MM-MON films exhibited superior stability due to the robust M4+–O bonds and M2+ releasing behavior resulting from the labile M2+–O coordinating. Together, the MM-MON films integrated the bacteria-responsive character of GNCs, exceptional chemical stability, and greatly enhanced antibacterial activity, ultimately killing adherent bacteria and initiating a self-defensive function. In a rat model for subcutaneous implant-associated infection, the MM-MON nanocoating showed an approximately 2 and 1 log lower multidrug-resistant Staphylococcus aureus implant and tissue colonization, respectively. The generalizable modular strategy of the GNC–metal networks is amenable to facilitate the functionalization of metal surfaces for combating implant-associated infections.
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Analytical Methods
·
2022
·Vol. 14
·期 28
·2754-2760
·
IF 3.532
Yuling Li,Xiaotong Wu,Zixuan Wu,Mingmin Zhong,Xiaoping Su,Youai Ye,Yan Liu,Lei Tan,Yong Liang
The identification of synthetic antioxidants has considerable significance in food safety. Here, we described the development of a colorimetric sensor array for rapid detection of eight antioxidants in food through the redox reaction between CoOOH and antioxidants in the presence of colorimetric signal indicators. The CoOOH nanoflakes exhibited high catalytic oxidation activity and can independently catalyze oxidation signal indicators showing different colors. The color reaction was inhibited to different degrees in the presence of antioxidants, which resulted in distinct signal response patterns for their discrimination. The method showed good linearity in the range from 50 to 1000 nM for butylated hydroxytoluene (BHT), butylhydroxyanisole (BHA), propyl gallate (PG) and tert-butyl hydroquinone (TBHQ). Moreover, different proportions of antioxidants were located in the middle pattern of each single antioxidant, and showed certain linear relationships among different concentration ratios. Finally, the proposed colorimetric sensor array was used for practical applications where TBHQ and BHT were detected in biscuits and sausages, and BHA and PG were detected in fried pork kebabs, respectively. The results were further confirmed by high-performance liquid chromatography, which demonstrated the great potential of the colorimetry sensor array for practical applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Jingna Liu,Bingqing Chen,Qianyi Hu,Qiong Zhang,Bingqing Huang,Peng Fei
To augment the functional attributes of pectin and expand its prospective utilization in food preservation, this research explored the enzymatic grafting of resorcinol and 4-hexylresorcinol onto pectin. Structural analysis verified the successful grafting of both resorcinol and 4-hexylresorcinol to pectin via esterification , with the 1-OH of resorcinol and 4-hexylresorcinol and the carboxyl group of pectin functioning as grafting sites. The grafting ratios of resorcinol-modified pectin (Re-Pe) and 4-hexylresorcinol-modified pectin (He-Pe) were 17.84 % and 10.98 %, respectively. This grafting modification notably enhanced the antioxidative and antibacterial properties of pectin. Specifically, DPPH clearance and the inhibition ratio in the β-carotene bleaching assay increased from 11.38 % and 20.13 % (native pectin, Na-Pe) to 41.15 % and 36.67 % (Re-Pe), and 74.72 % and 53.40 % (He-Pe). Moreover, the inhibition zone diameter against Escherichia coli and Staphylococcus aureus rose from 10.12 and 10.08 mm (Na-Pe) to 12.36 and 11.52 mm (Re-Pe), and 16.78 and 14.87 mm (He-Pe). Additionally, the application of native and modified pectin coatings effectively impeded pork spoilage, with the modified pectins demonstrating a more potent effect. Among the two modified pectins, He-Pe exhibited the most significant enhancement in pork shelf life.
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