MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Jiangru Wang,Qirui Shen,Xifeng Yu,Qi Kang,Dazhong Shen
Multi-signal assays offer the advantage to improve the accuracy and diversity by integrating the merits of each output. In the widely used colorimetric and fluorometric dual-mode, the fluorescent intensity and absorbance signals are usually measured by a lab spectrofluorometer and a spectrophotometer. Herein, a smartphone-based device which is able to measure simultaneously the ratiometric fluorescence and absorbance signals was designed. Its analytical performance is demonstrated by the determination of Rhodamine B (Rh B). In a three-channel cuvette, the detection cell (with test solution) was sandwiched between two light intensity measurement cells (with Rh B standard solution). Under the irradiation of the excitation light of 550 nm, the fluorescent images of the three cells were captured by the camera in a smartphone. The ratiometric fluorescence at 590 nm and the absorbance at 550 nm are obtained according to the brightness ratio of the middle cell and the third cell to the first one, respectively. The dual-mode of fluorescence and absorbance can widen the detection range, with the limit of detection for Rh B of 3.2 nM in ratiometric fluorescence mode and 0.38 μM in absorbance outputs, respectively. Importantly, the possible inner filter effect at the excitation wavelength of the fluorescence can be corrected according to the absorbance signal, improving the accuracy of determination. The dual-mode portable device was used to determine Rh B in combination with differential molecularly imprinting strategy to improve further the anti-interference ability.
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GOLD BULLETIN
·
2022
·Vol. 55
·期 1
·31-40
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IF 1.564
Wang Cuiping,Zhang Huan,Wang Chunrong
A simple template-free method was developed for the fabrication of fibers whose surfaces were covered by a three-dimensional interconnected network of Au nanostructures (3D-NW AuNSs) without additional stabilizer. The EDS and XPS measurements confirmed the metallic nature of the formed 3D gold nanowire networks on the fiber surface. The morphology of these 3D-NW AuNSs can be controlled by the experimental parameters, such as reaction time, roughness of the glass fiber surface, HAuCl 4 , and sodium citrate concentration. The 3D gold nanowire networks showed excellent uniformity. Additionally, the nanofiber was used to accurately and reliably detect methyl red (MR), crystal violet (CV), and acridine orange (AO), which can be detected as low as 1, 10, and 5 μg/L, respectively. Since the proposed strategy is simple, cost-effective, and reproducible for the mass production of network-like gold film–covered nanofiber, it is expected to play an important role in the development of trace analytical devices.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Xiaochun Ma,Zhaodong Zhu,Haichuan Zhang,Shenglong Tian,Xiaohong Li,Huiming Fan,Shiyu Fu
Deacidification and surface self-cleaning are of great significance for the long-term preservation of historic literature. Herein, a superhydrophobic self-cleaning coating, derived from nanocellulose coated with CaCO 3 particles is constructed via chemical vapor deposition (CVD) for the first time for the preservation of historic paper. The static contact angle of superhydrophobic paper reached more than 150° and the minimum sliding angle was 6.4°. Deacidification effect was achieved with a desired pH value in the range from 7.50 to 7.77 and the maximum alkali storage was up to 1.235 mol/kg. It is found that the low-cost CaCO 3 nanoparticles can not only remove the acid substances, but also gave the paper function of self-cleaning, which is very great significant for the protection of paper-based relics.
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MOLECULES
·
2022
·Vol. 27
·期 3
·1079
·
IF 4.927
Henghui Zhang,Zhijun Zhang,Dongliang He,Shuying Li,Yongping Xu
Botanical oils are staple consumer goods globally, but as a by-product of oil crops, meal is of low utilization value and prone to causing environmental problems. The development of proteins in meal into bioactive peptides, such asPerillapeptide, through biotechnology can not only solve environmental problems, but also create more valuable nutritional additives. In the present work, the hydrolysis process ofPerillameal protein suitable for industrial application was optimized with the response surface methodology (RSM) on the basis of single-factor experiments. Alcalase was firstly selected as the best-performing among four proteases. Then, based on Alcalase, the optimal hydrolysis conditions were as follows: enzyme concentration of 7%, hydrolysis temperature of 61.4 °C, liquid-solid ratio of 22.33:1 (mL/g) and hydrolysis time of 4 h. Under these conditions, the degree of hydrolysis (DH) ofPerillameal protein was 26.23 ± 0.83% and the DPPH scavenging capacity of hydrolysate was 94.15 ± 1.12%. The soluble peptide or protein concentration ofPerillameal protein hydrolysate rose up to 5.24 ± 0.05 mg/mL, the ideal yield of which was estimated to be 17.9%. SDS-PAGE indicated that a large proportion of new bands in hydrolysate with small molecular weights appeared, which was different from the originalPerillameal protein. The present data contributed to further, more specific research on the separation, purification and identification of antioxidant peptide from the hydrolysate ofPerillameal protein. The results showed that the hydrolysis ofPerillameal protein could yield peptides with high antioxidant activity and potential applications as natural antioxidants in the food industry.Keywords:Perillameal protein;hydrolysate;response surface methodology;antioxidant activity;peptide
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RSC Advances
·
2022
·Vol. 12
·期 8
·4550-4561
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IF 4.036
Yun Liu,Haihua Yang,Tao Chen
It is highly desirable to explore efficient catalysts for reducing toxic Cr6+ to benign Cr3+ under mild and eco-friendly conditions. This article describes a facile fabrication of nitrogen doped carbon (N@C-g-C3N4) as a metal-free catalyst for Cr6+ reduction using lignin as a carbon source and g-C3N4 nanosheets as a nitrogen source. The structural properties of the N@C-g-C3N4 catalyst are characterized by TEM, HR-TEM, XRD, TGA, Raman, EDS-mapping, XPS and BET techniques. The summation of these analyses sheds light on the high surface area (903 m2 g−1), mesopore size (17.3 nm) and defects (ID/IG = 0.97) of N@C-g-C3N4, which contribute to its excellent catalytic activity in HCOOH-mediated reduction of Cr6+ to Cr3+ with high rate constant (2.98 min−1) and turnover frequency (2.21 molK2Cr2O7 gcatalyst−1 min−1) and complete degradation (100%) within 5 min. The catalytic performance of the catalyst reveals that the reduction activity is significantly dependent on the concentration of Cr6+ and HCOOH, catalyst loading, pH, temperature, and foreign ions. Particularly, the N@C-g-C3N4 catalyst shows superior stability and renewability with little loss of activity (≥95%) after 8 months storage and five repeated uses. Furthermore, N@C-g-C3N4 can be applied in other hydrogenation reactions involving K3[Fe(CN)6], 4-NP and BPA using NaBH4 as a hydrogen donor, and the removal of organic dyes. These findings illustrate that N@C-g-C3N4 as a metal-free catalyst is effective, versatile and eco-friendly for the reduction of Cr6+ from contaminated environments.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Longming Jin,Lijie Hu,Songmiao Liang,Zhiliang Wang,Guoyang Xu,Xingsheng Yang
The organic solvent nanofiltration (OSN) membranes are an attractive candidate that enable carbon-neutral nature in both isolation and purification process. However, the application of current commercial available OSN membranes is severely hindered by their inferior permeability and selectivity. Here, using poly(m-phenylene isophthalamide) (PMIA) as support, a thin film composite (TFC) membrane with remarkably high permeability and ideal selectivity is fabricated in an industrial-scale manufacturing line and the relevant spiral-would module is successfully prepared. Optimization by the solvent activated, the TFC membrane with an extraordinary solvent permeation for acetone, methanol and acetonitrile are 63, 41 and 38 L m −2 h −1 ∙bar −1 , respectively. The nanofiltration performance of A-TFC membrane supports out-performs: at similar rejection (100%) the methanol and acetonitrile permeance increased dramatically at 10 and 5 times than current commercial OSN membranes, respectively. The spiral-would module is carried out in methanol and acetonitrile RB (1017 g mol −1 ) solution, which displays a high permeate fluxes and stable separation performances, methanol: 112 GPD, 98%; acetonitrile: 99 GPD, 99.3%. This work provided a large-scale facile process for high-performance PMIA based OSN membrane, and the fabrication of spiral-would module, which should be promising for manufacture of solvent-resistant TFC membrane in industrial scale-up.
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Soft Matter
·
2022
·Vol. 18
·期 20
·3856-3866
·
IF 4.046
Panpan Li,Aixin Song,Jingcheng Hao,Xu Wang
In biology, nonequilibrium assembly is characterized by fuel-driven switching between associating and nonassociating states of biomolecules. This dynamic assembly model has been used routinely to describe the nonequilibrium processes in synthetic systems. Here, we present a G-quartet-based nonequilibrium system based on fuel-driven co-assembly of guanosine 5′-monophosphate disodium salt hydrate and urease. Addition of lanthanum(III) ions to the system caused macroscopic dynamic switching between precipitates and hydrogels. Interestingly, combined analyses of the nonequilibrium systems demonstrated that molecules could switch between two distinct associating states without undergoing a nonassociating state. This finding suggested a nonequilibrium assembly mechanism of topological reconfiguration of molecular assemblies. We detailed quantitatively the nonequilibrium assembly mechanism to precisely control the phase behaviors of the active materials; thus, we were able to use the materials for transient-gel-templated polymerization and transient circuit connection. This work presents a new nonequilibrium system with unusual phase behaviors, and the resultant active hydrogels hold promise in applications such as fluid confinements and transient electronics.
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FOOD CHEMISTRY
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2022
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IF 9.231
Okon Johnson Esua,Da-Wen Sun,Jun-Hu Cheng,Huifen Wang,Chen Chen
Hybridising plasma functionalized water and ultrasound pretreatment for the enzymatic hydrolysis (HPUEH) of Larimichthys polyactis was evaluated by adopting Plackett-Burman design for parametric screening of six key variables, and Box-Behnken design for optimizing three most significant variables including plasma generating voltage (P V ), ultrasound treatment time (U T ), and enzyme concentration (E C ). The models developed for predicting the degree of hydrolysis (DoH), protein recovery (PVY), and soluble protein content (SPC) were sufficiently fitted to the experimental data (R 2 ≥ 0.966) with non-significant lack of fit and used for determining the optimum conditions as P V of 70 V, U T of 15 min, and E C of 1.787%, with predictive values of 27.74%, 85.62%, and 3.28 mg/mL for DoH, PVY, and SPC, respectively. HPUEH presented hydrolysates with smaller peptide sizes and molecular weights, enhanced DoH, PVY, SPC, amino acids and antioxidant activity, but reduced emulsifying and foaming properties when compared with conventional enzymatic hydrolysis.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Okon Johnson Esua,Da-Wen Sun,Jun-Hu Cheng,Ji-Lin Li
The effects of the treatment (UPFL) combining ultrasound (US) with plasma functionalized liquids (PFL) were evaluated on the quality of vacuum-packaged silver Pomfret stored at 4 ℃ for 15 days. Conformational modifications in myofibrillar proteins, improvements in nutritional value and biomedical index of fatty acids and lipids, reduced pH of 5.70, increased K -value, TBARS, and TVB-N at values of 12.05%, 0.576 mg MDA/kg, and 9.15 mg N/100 g, respectively, and 1.99 log reductions in spoilage microorganisms were evident immediately after treatments. UPFL presented better quality preservative effects when compared with individual applications of US or PFL, and vacuum packaging ensured optimal quality enhancement effects such as stability of myofibril fragmentation, inhibition of physicochemical quality degradation, and microbial growth control. The results also revealed the predominant cultivable spoilage microbiota of vacuum-packaged silver Pomfret treated with UPFL, providing valuable information towards developing broad-spectrum sanitisers and hurdle technology for the seafood industry.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Chengjiang Lu,Shuai Bian,Ke Hu,Caicai Li,Kaiwen Zheng,Qingfeng Sun
Preparing biomass-based epoxy resin with high temperature resistance and flame retardancy is still an appealing yet challenging task. Now, a high-temperature resistant and flame-retardant resveratrol-based epoxy (RESEP) has been synthesized through a facile one-step method. The structure of RESEP was established using FTIR and NMR spectroscopy . RESEP and petroleum-based epoxy diglycidyl ether of bisphenol A (DGEBA) were each cured with 4,4-diaminodiphenyl methane (DDM) to prepare RESEP/DDM and DGEBA/DDM. Differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile testing, thermogravimetric analysis (TGA), thermogravimetric analysis-infrared spectroscopy (TG-IR), scanning electron microscopy (SEM), limiting oxygen index (LOI) and the UL-94 vertical burning test were used to systematically evaluate the properties of RESEP and RESEP/DDM. The glass transition temperature (T g ) of RESEP/DDM is 335 ℃, which is significantly higher than that of DGEBA/DDM (168 ℃). In addition, RESEP/DDM displays good thermogravimetric performance and flame retardancy. Typically, it displays a UL-94 V-0 rating, an LOI value was as high as 31.8%, and a char yield as high as 38.6% (800 ℃). The results reported indicate the possibility of preparing biomass-based epoxy resin with high temperature resistance, flame retardancy and mechanical properties, which is potential to be utilized in the fields of electronics and aerospace.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Swati Mahato,Da-Wen Sun,Zhiwei Zhu
This work studied the effects of electromagnetic fields (EMF) with frequencies between 100 and 400 Hz and a fixed strength of 12 mT on cold storage of grass carp at 4 °C for 30 min, and Ca 2+ ATPase enzyme activities, and lipid and protein oxidations in samples were measured to assess changes in intracellular Ca 2+ concentration and oxidative stability. Results showed higher Ca 2+ ATPase activities in samples treated with EMF frequencies. Significant ( p < 0.05) decreases occurred in protein oxidation for samples treated between 100 and 300 Hz, but an increase was observed for treatment with 400 Hz. However, the lipid oxidation increased for samples treated up to 200 Hz and decreased with further increase in frequency to 300 and 400 Hz. Nuclear magnetic resonance analysis showed that exposure to different frequencies of EMF could reduce the association of water molecules with protein for both bound and immobilized water. Overall, treatments of EMF between 100 and 400 Hz could improve grass carp quality during cold storage.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Keke Li,Sen Li,Wule Zhang,Zhifeng Shi,Di Wu,Xu Chen,Pei Lin,Yongtao Tian,Xinjian Li
Photocatalytic applications of halide perovskites have attracted increasing attention. However, lack of stability and lead toxicity of lead halide perovskites have hindered their applications. Metal halide double perovskite (DP) Cs 2 AgInCl 6 is a stable, environment-friendly semiconductor with direct band gap, and then the best promising alternative to lead halide perovskites. Here, the applications of Cs 2 AgInCl 6 DP to photocatalytic degradation of organic pollutants have been developed, in which the octahedral Cs 2 AgInCl 6 DP particles (~3.33 eV) were prepared by precipitation from acid solutions. The as-prepared samples exhibit high photocatalytic activity, which can degrade about 98.5% of water-insoluble carcinogen Sudan Red III in only 16 min, and have a good stability for 5 cycle operations. Furthermore, the Cs 2 AgInCl 6 DP also can degrade Rhodamine B, Methyl orange and Methyl red efficiently, demonstrating a highly-efficient and stable ethanol solvent-based photocatalytic system for organic pollutants degradation. The high photocatalytic activity could be attributed to direct band gap and long carrier lifetime of Cs 2 AgInCl 6 DP. These unique features of Cs 2 AgInCl 6 DP indicate that it could have a good application prospect for photocatalytic degradation of organic pollutants.
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