JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 10
·13581-13587
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IF 2.478
Chen Junzhe,Du Haiying,Xu Yifeng,Ma Boyu,Zheng Zhihong,Li Pengchan,Jiang Yuqiu
Carbon quantum dots (CQDs) were synthesized by coffee grounds as the carbon source under hydrothermal carbonization treatment for the first time. The obtained turn-on CQDs showed a strong emission at the wavelength of 460 nm, with an optimum excitation of 370 nm, and enrichment of the surface functional groups (–OH, –NH 2 ). Sodium cyclamate in an aqueous solution and the turn-on CQDs could form a core–shell structure by hydrogen bonding and van der waals bonding to enhance the fluorescent emission. With such a design, turn-on CQD-based fluorescence detection techniques towards sodium cyclamate could be realized. Under optimal conditions, a linear relationship was found in the range of 2.8–56 µmol/L sodium cyclamate with the detection limit (3 δ/k ) of 3.16 µmol/L which is lower than the national standard detection limit of 49.7 µmol/L. The sensitive method has a great application prospect in detection of sodium cyclamate in real samples owing to its low detection limit, simplicity and rapidity.
研究领域:
分析化学
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食品科学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
An electrolyte solution incorporating sodium saccharin and an alkynyl compound was provided to electroform Ni-P-PTFE mold inserts with both low internal stress and good self-lubricating properties. The results showed that with 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound, the internal stress reached a minimum of −114 MPa, an 82 % reduction from the −646 MPa observed without additives. The presence of sodium saccharin and alkynyl compound in the electrolyte solution reduced the hydrogen evolution reaction current from 15.2 to 12.9 mA at the operating cathode potential of −1 V and decreased the RTC (111) from 100 % to 90 %. The reduction of internal stress in the electrodeposited Ni-P-PTFE composites was attributed to the decreased hydrogenation strain, diminished Ni (111) texture intensity, and the partial incorporation of alkynyl compound reaction products into the deposits, which weakened the connections between crystallites. Finally, 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound was applied to electroform Ni-P-PTFE mold insert with micro features. Only slightly pile-up defects at the corner of grooves were observed on the polymer chips demolded from Ni-P-PTFE mold insert, demonstrating its good self-lubricating property.
研究领域:
材料科学
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电化学工程
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产品关联
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 35
·4524-4532
·
IF 3.1
Huipeng Deng,Zakir H. Talpur,Kaijun Wang,Yan Kang,Yiping Du,Dongmei Xu,Xinglong Fan,Wei Li
A novel magnetic agitating heater powered by a USB port has been developed and applied to synthesize silver colloid substrate for surface-enhanced Raman scattering (SERS) detection of sodium saccharin content on the tipping paper of cigarettes. The heater device allows the convenient synthesis of the Ag colloid, and the reaction can be completed on-site in 15 min under mild conditions. The on-site synthesis of SERS substrate effectively avoided the need for storage and concerns regarding the poor stability and short lifespan of colloid substrates. The results demonstrated that the substrate obtained with the device could achieve SERS detection of Rhodamine 6G (R6G) at as low as 10−9 mol L−1 while maintaining a stable intensity with a relative standard deviation (RSD) of 5.52% (n = 5). Using the prepared substrate at the optimal conditions, the limit of detection of sodium saccharin (SS) was 1 mg L−1. By introducing an internal standard KSCN, a linear relationship was observed between the relative intensity at 708 cm−1 and the concentration of the SS in a range of 20–100 mg L−1 (R2 = 0.98). With the developed method, SS was directly extracted from the cigarette paper by immersing it in water, and the extracted solution was subsequently detected. The quantitative spike-recoveries were in the range of 95.5–116.7%, with RSD between 2.3–12.6%. The whole detection procedure including the on-site substrate preparation, took only about 30 min. This work opens new avenues for colloidal synthesis, and the detection method of SS on the cigarette paper also holds great promise in food safety applications.
研究领域:
分析化学
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食品安全检测
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Weiwei Zheng,Wentao Tian,Xiaojun Liu,Qingquan Zhang,Chenghua Zong,Jia-Ping Lai,Wenfeng Zhao
Flexible surface-enhanced Raman scattering (SERS) substrates, specifically paper-based SERS substrates, are generally employed in many practical applications. However, paper-based SERS substrate quantitation is still challenging because of the inferior uniformity originating from the irregular morphology of the paper. The present study synthesized Ag nanoparticles (NPs) via the in situ photochemical reduction of Ag + ions on a titanium dioxide (TiO 2 ) film at the polyester fiber membranes (PFMs) surface. This generated many “hot spots” that presented significant SERS activity with an enhancement factor of 2.1 × 10 9 . Sodium saccharin (SS) bonded to the Ag NPs surface via the carbonyl oxygen and ring nitrogen atoms. A SERS sensor with photochemically deposited Ag NPs was prepared for the sensitive and rapid detection of SS in soft drinks with a limit of detection of 0.3 mg/L. The recovery rate ranged from 93% to 103%, indicating that this method is reliable in actual sample detection with simple pretreatment steps and can be potentially applied for the on-site detection of food additives for food safety.
研究领域:
材料科学
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分析化学
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食品安全
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Guowen Zhang,Langhong Wang,Xiaoyue Zhou,Yu Li,Deming Gong
The binding characteristics of sodium saccharin (SSA), an artificial sweetener, with calf thymus DNA (ctDNA) were investigated by multispectroscopic techniques, chemometrics, and molecular simulation. A combined fluorescence and UV–vis spectroscopic data matrix was resolved by the multivariate curve resolution–alternating least-squares (MCR–ALS) chemometrics algorithm. The MCR–ALS analysis extracted simultaneously the concentration profiles and spectra for the three components (SSA, ctDNA, and SSA–ctDNA complex) to quantitatively monitor the SSA–ctDNA interaction, which is difficult to perform by conventional spectroscopic approach. The binding mode of SSA to ctDNA was principally through groove binding as revealed by ctDNA melting temperature studies, viscosity measurements, and iodide and salt quenching effects. Analysis of the Fourier transform infrared and circular dichroism spectra as well as molecular docking indicated that SSA preferentially bound to the guanine base of ctDNA and led to a transformation from B-like DNA structure to A-like conformation. Moreover, gel electrophoresis results suggested that SSA did not induce any significant cleavage in plasmid DNA.
研究领域:
生物化学
·
分子生物学
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分析化学
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生物物理学
✓ 已验证
DOI
PubMed
高影响因子
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