ENVIRONMENTAL RESEARCH
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2020
·
IF 5.715
Zhenlan Xu,Xiaoting Qian,Chao Wang,Chunrong Zhang,Tao Tang,Xueping Zhao,Lingxiangyu Li
Microplastics (MPs) as a type of emerging contaminant in the environment have attracted extensive attentions in recent years, and understanding the impacts of MPs on soil biodiversity and functioning are thus increasingly urgent. Nevertheless, few studies were performed to investigate potential effects of MPs on decay of soil organic pollutants in particular pesticides and enzyme activities . Herein, three types of MPs including polystyrene fragments (PS-50) and polyvinyl chloride beads (PVC-42000 and PVC-10) were added to soil at environmentally relevant concentrations (0.2 and 1.0%) to study their impacts on dissipation of thiacloprid and activities of urease, acid phosphatase , invertase and catalase . MPs exhibited negligible impacts on thiacloprid dissipation regardless of MPs type and content, being probably attributed to the unaltered bioavailability of thiacloprid in soil even after an addition of MPs, which was documented by using the hydroxypropyl-β- cyclodextrin (HPCD) extraction method. Batch sorption experiments also exhibited the comparable adsorption capacity of thiacloprid to soil with and without MPs, along with K f valuses of 3.44–3.77. Besides, MPs exerted negligible effects on enzyme activities of soil. Taken together, this study showed negligible impacts of MPs at environmentally relevant concentrations on thiacloprid dissipation and enzyme activity, expanding our knowledge on impacts of MPs at the environmentally relevant concentrations on pesticide dissipation in soil.
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CHEMOSPHERE
·
2020
·
IF 5.778
Yingjie Wu,Luyao Ma,Qizhen Liu,Olivera Topalović,Qiong Wang,Xiaoe Yang,Ying Feng
Plant growth-promoting bacteria (PGPB) can promote root uptake and shoot accumulation of cadmium (Cd) in hyperaccumulator plants, but the mechanisms by which PGPB accelerate root-to-shoot transport of Cd is still unknown. A better understanding of these mechanisms is necessary to develop the strategies that can promote the practical phytoextraction of Cd-polluted soils. In this study, we found that Pseudomonas fluorescens accelerates a reversed and a long-distance transport of Cd and sucrose in Sedum alfredii , by examining the xylem and phloem sap and by quantifying the concentrations of Cd and sucrose in shoot and root. The transcriptome sequencing has revealed the up-regulated expressions of starch metabolism and sucrose biosynthesis related genes in the shoots of Cd hyperaccumulator plant S. alfredii that was inoculated with PGPB P. fluorescens . In addition, the genes of sugar, cation and anion transporters were also up-regulated by bacterial treatment, showing a complicated co-expression network with sucrose biosynthesis related genes. The expression levels of Cd transporter genes, such as ZIP1 , ZIP2 , HMA2 , HMA3 and CAX2 , were elevated after PGPB inoculation. As a result, the PGPB successfully colonized the root, and promoted the sucrose shoot-to-root transport and Cd root-to-shoot transport in S. alfredii. Since non-photosynthetic root-associated bacteria usually obtain sugars from photosynthetic plants, our results highlight the importance of PGPB-induced changes in hyperaccumlator plants for both the host and the PGPB.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Yaoping Hu,Zhijin Gao
In this paper, we exploit an innovative strategy to reuse waste rubber tires as a low-cost source for the fabrication of a high-value material, fluorescent carbon dots (CDs). In the hydrothermal condition, ammonium persulphate is utilized to oxidize the tires and offer nitrogen atom for doping, to produce CDs with a high quantum yield (QY) of up to 23.8%. Such a QY is outstanding among the reported waste-derived CDs. It is found that the fluorescence of CDs can be remarkably quenched by Sudan I–IV with negligible interference from other substances. The corresponding linear ranges are 0.5–60, 0.5–60, 1–70, and 1–70 μM, and limits of detection are 0.17, 0.21, 0.53, and 0.62 μM for Sudan I, II, III, and IV, respectively. Systematic investigations reveal that the fluorescence quenching mainly stems from the inner filter effect. Moreover, the CD-based sensor shows an excellent applicability for the assay of Sudan dyes in chili powder sample.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Na Li,Yong Qing Zhong,Shi Gang Liu,Yong Qin He,Yu Zhu Fan,Jian Hua Hu,Xi Mai
Ascorbic acid (AA) is an important diet-derived antioxidant to human body. Thus, efficient and accurate detection of AA is of considerable significance in food analysis. Herein, smartphone assisted colorimetric and fluorescent triple-channel signal sensor has been developed for AA monitoring based on oxidase-like CoOOH nanoflakes . CoOOH nanoflakes can efficiently catalyze the oxidation of p -phenylenediamine (p-PD) into reddish brown p-PDox. The carbon dots (C-dots) are further introduced, of which the fluorescence can be quenched by p-PDox. However, in the presence of AA, the CoOOH nanoflakes is reduced and thus collapsed. As a result, the oxidation of p-PD is restrained, and thus the fluorescence of C-dots keeps strong. Based on AA induced light color, low absorbance, and strong fluorescence, triple-channel signal sensor has been proposed for AA determination. The AA assay shows a dynamic response range from 0.5 to 10 μM with a detection limit of 0.09 μM. The method assay allows detection of AA in real samples such as fruit juices. Combination with portable smartphone, the developed sensor is potential for AA determination in resource-poor settings.
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JOURNAL OF FOOD PROCESS ENGINEERING
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2020
·Vol. 43
·期 7
·e13419
·
IF 1.703
Qingyi Wei,Ting Liu,Hongbin Pu,Da-Wen Sun
Tea polyphenols (TPs) are a major functional ingredient in tea, but current traditional detection methods for TPs are generally time-consuming and involve a lot of organic chemicals. In this study, carbon dots (CDs) with a high quantum yield of 73.66% was prepared using a rapid, safe, and economical way. The synthesized CDs had an average particle size of 5 nm in diameter and showed a strong emission peak at 445 nm when the excitation wavelength was 350 nm. Additionally, a fluorescent CDs/Cu 2+ probe was employed for detection of TPs. This fluorescent sensing approach allowed for detecting TPs in the range between 1 and 30 μg/mL with a low detection limit of 0.31 μg/mL. Besides, satisfactory recoveries of 101.11–106.97% in spiked real tea samples were obtained by this present probe. The outcomes confirmed the applicability of the fluorescent CDs/Cu 2+ probe for TPs measurements in spiked real samples. Moreover, as compared with the standard Folin–Ciocalteu method, the probe was facile and time-saving for the detection of TPs. Therefore, it is hoped that this effective way could also be employed to quantify phenolic compounds from other herbal plants in future studies. Practical Applications In this paper, low toxicity, low cost, simple synthetic, and water solubility of carbon dots (CDs) coupled with Cu 2+ was applied as a fluorescent probe to detect TPs. Compared with the traditional method, good applicability was shown with the proposed method for TPs measurements in real tea samples, indicating great potential for monitoring the content of TPs in tea. In the future, it could provide a sensitive and effective way of detecting phenolic compounds from other herbal plants for the industry.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Shuang Sun,Lijie Zhao,Jirui Yang,Xiaoqi Wang,Xiaoya Qin,Xinhua Qi,Feng Shen
A green, efficient, and facile ball-milling-assisted strategy was proposed to design an SO3H-containing solid acid for biomass valorization, where −SH groups were grafted on a natural clay attapulgite by wet ball milling with 3-mercaptopropyltrimethoxysilane (MTPS), followed by the oxidation of −SH to −SO3H with H2O2 at room temperature. The mechanism of the −SO3H functionalization by the ball-milling process was investigated, and the investigation indicated that the MTPS was grafted on the attapulgite through hydrolysis and condensation, which was induced by the mechanical forces of ball milling. Characterization, including SEM, EDX (energy-dispersive X-ray spectrometry), NH3-TPD, TGA, FT-IR, elemental analysis, and XPS, confirmed the success of −SO3H modification on attapulgite with a total acidity of 1.81 mmol/g. Harsh conditions involving a corrosive sulfonating agent, organic solvent, or high temperature in traditional methods are avoided in the developed approach. The prepared catalyst displayed a high activity toward the transformation of biomass-derived carbohydrates (glucose, fructose, cellobiose, sucrose, starch, and cellulose) into the more valuable chemical 5-hydroxymethylfurfural due to the synergy effect of MgO and −SO3H sites on the catalyst. Moreover, the catalyst showed excellent stability and recyclability for five recycles without loss of activity. This study provides a novel green method for the preparation of an SO3H-containing heterogeneous catalyst, which should have great application potential in other processes of biomass valorization.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 13
·3091-3101
·
IF 3.637
Liu Yongquan,Xue Ahui,Ding Lili,Hao Yingbin,Liu Huihui,Cui Meng,Liu Lihua,Nie Zongxiu,Luo Liping
Citrus Huanglongbing (HLB) is one of the most destructive citrus diseases worldwide, and is associated with the phloem-limited plant pathogenic bacteria Candidatus Liberibacter species. However, there is a latency period during which newly infected trees do not show symptoms, creating challenges for the early detection of HLB. In order to establish a method for rapid detection and to assess the metabolite differences between healthy and HLB-affected Newhall navel oranges, we used matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) to study asymptomatic and symptomatic leaf extracts compared with healthy leaves. The results showed that healthy, asymptomatic, and symptomatic leaves were distinguishable using MALDI-TOF-MS combined with multivariable analysis. Discriminant analysis (DA) results showed that the accuracy of discrimination of the training set and the success rate of cross-validation analysis were both 100%. Blind testing revealed that nine validation samples were correctly classified to their corresponding group. In addition, 32 MS peaks of metabolites had significant differences between healthy and different HLB-affected navel orange leaves. Among 32 MS peaks, the relative content of nine substances showed an upward trend, and 19 metabolites showed a downward trend, including a significant decrease in malate and citrate, with an increase in HLB bacterial populations. Malate and citrate were found to be specifically reduced in infected leaves regardless of whether symptoms appeared. Thus, they could be used as potential biomarkers for early detection of HLB, reducing false-negative results caused by uneven distribution of the HLB bacterial pathogen. This novel method can efficiently differentiate HLB-affected samples from the host population and provide new information for early detection of HLB in citrus. The entire process from metabolite extraction to the collection of mass spectra of citrus leaves was a simple operation, with no need for sterile conditions. We believe this strategy has significant implications for rapid and effective HLB screening.
Graphical abstract
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Nanoscale
·
2020
·Vol. 12
·期 12
·6852-6860
·
IF 6.895
E. Shuang,Quan-Xing Mao,Jian-Hua Wang,Xu-Wei Chen
Regulating the fluorescence of carbon dots (CDs) is important but highly challenging. Here, carbon dots with tunable dual emissions were facilely fabricated via modulating the polymerization and carbonization processes of o-phenylenediamine (OPD) with lysine (Lys) as the co-precursor and modulator, respectively. The self-polymerization/carbonization of the OPD molecules contributed to the blue/green emission of the OPD-derived CDs. The introduction of Lys in the CD fabrication process efficiently suppressed the carbonization of the OPD polymer chains and enhanced the self-polymerization of the OPD molecules. Meanwhile, the formed OPD-Lys co-polymer chains endowed the final CD product with a new green emission center. The dual-emissive CDs were distinctly sensitive to polarity fluctuations, providing a ratiometric fluorescence response towards solution polarity. Due to their specific distribution in the endoplasmic reticulum (ER), the as-prepared dual-emissive CDs successfully distinguished the polarity variations in ER under stress, which offers a new approach for the early diagnosis of cell injury.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 7
·1-9
·
IF 1.81
Nguyen Hung H.,To Nguyen V.,Tran Thu V.,Nguyen Ky V.,Luong Son T.,Nguyen Nga N. T.,Hoang Chung V.,Nguyen Hieu S.,Nguyen Nghia V.
The NiCo 2 O 4 ternary transition metal oxide (NCO) has been received a great interest as anode material for sodium-ion batteries, recently. Here we show that a composite material composed of NCO nanoparticles (NCO-NPs) and amorphous carbon (NCO/C composite) displayed a superior electrochemical performance over the NCO-NPs. The NCO-NPs delivered a capacity of 172 mAh g −1 at the current density of 50 mA g −1 , and the capacity was reduced to 29 mAh g −1 after 50 cycles. The NCO/C composite showed a capacity of 213 mAh g −1 at 50 mA g −1 ; the capacity was lowered to 119 mAh g −1 after 100 cycles. The capacity of the composite at 100 mA g −1 , 200 mA g −1 and 300 mA g −1 was ca. 123 mAh g −1 , 93 mAh g −1 and 62 mAh g −1 , respectively. This improvement is ascribed to the presence of the activated hard carbon of high electronic conductivity. Our work suggests that the combination of amorphous carbon with the NCO-NPs can serve as anodes for sodium-ion batteries.
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Advanced Materials Technologies
·
2020
·Vol. 5
·期 7
·2000138
·
IF 5.969
Junjie Hao,Yiwen Li,Xiaoqian Xu,Fenghuan Zhao,Ruikun Pan,Junzi Li,Haochen Liu,Kai Wang,Jiagen Li,Xi Zhu,Marie-Hélène Delville,Ming Zhang,Tingchao He,Jiaji Cheng
Chiral transition metal oxides nanoparticles (NPs) with tunable optical properties are widely accepted as promising toolbox for chiral recognition, stereoselective synthesis, and chiroptical devices. Herein, chirality-based strategy is presented for discrimination of d -glucose from its enantiomer through a cooperative synergy between chiral cysteine capped MoO 2 NPs and the glucose oxidase nanosystem. The valence-state-dependent chirality induced by metal-ligand charge transfer effect is found to be ultrasensitive to its redox environment such as the presence of hydrogen peroxide, which is a key indicator of the stereoselective enzymatic reaction between glucose oxidase and d -glucose. With this know-how, glucose enantiomers can be precisely quantified with a limit of detection of 0.446 µ m . Such a chiral bio-nanosystem would be an ideal platform for a rational design of new types of biosensors, photocatalysts, and chirality-based nanodevices.
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TALANTA
·
2020
·
IF 5.339
Yuting Li,Xing Guo,Yonghui Tian,Tianlong Zhang,Zewei Luo,Xiaojiao Liu,Cheng Qian,Jianxiong Dai,Yixiang Duan
Obtaining the fingerprints of polysaccharides was known to be notoriously difficult by ambient mass spectrometry due to their resistance for desorption and ionization. Ambient mass spectrometry technology has recently been recognized as a quick analysis tool for obtaining fingerprints, which is attributed to its characteristics of no sample pretreatment and easy operation under atmospheric pressure. However, it still remains a challenge for accurate identification of the fingerprints of macromolecular polysaccharides by ambient micro-fabrication glow discharge plasma (MFGDP). In this study, a simplified methylation method was introduced to realize rapid analysis of polysaccharide mixture by MFGDP with the assistance of a temperature-programmed system (TPS). At the optimal temperature of TPS, oligosaccharides , plant polysaccharides and polysaccharide mixtures were all well characterized by TPS-MFGDP. In the proposed method, the characteristic [M + NH 4 ] + adduct ions of oligosaccharides ions of oligosaccharides that are difficult for other ambient mass spectrometric methods were abundantly produced, making it possible to simultaneously identify a mixture of five or more polysaccharides. In addition, a supervised classification model which based on MS spectra, was used to classify seven typical hypoglycemic polysaccharides with excellent sensitivity, specificity and accuracy, indicating the good classification performance of the RF model constructed. Thus, the proposed mass spectroscopic method provides a cost effective, accurate and high throughput tool for identification and classification of polysaccharides, which is beneficial for studying the biological activity of polysaccharides.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Dong An,Xiaoyuan Duan,Shuaishuai Cheng,Zhiyi Zhang,Bo Yang,Qingsong Lian,Jiaxiong Li,Zhijian Sun,Yaqing Liu,Ching-Ping Wong
With the rapid development of electronic integration technology, the timely and efficient heat dissipation capacity has become increasingly important to ensure reliability and lifetime of electronics. Thermal interface materials (TIMs) were considered as the best candidate to tackle this issue. In this work, the three-dimensional structures with covalent bond connections of boron nitride/natural rubber (BN/NR) thermal interface composites were successfully prepared and its possessed an ameliorated through-plane thermal conductivity of 0.79 W m −1 K −1 when BN content were 25 wt%. The results demonstrated that three-dimensional network structures and chemical interactions between BN and NR had a significant contribution in reducing interfacial thermal resistance. Meanwhile, the sensitive thermal response, satisfactory electrical insulation and good mechanical properties made its own high probability for the TIMs applications. Importantly, this tactics created a new means to construct elastomer-based thermal management materials and applied for the electronic packing materials.
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危险品化学品经营许可证（带存储）