Insects
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2020
·Vol. 11
·期 11
·777
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IF 2.22
Chengfeng Lei,Jian Yang,Jia Wang,Jia Hu,Xiulian Sun
Simple SummaryThe fall armyworm is a notorious lepidopteran pest that consumes many economically important crops. Its recent invasion into China threatens crops in over 19 provinces. This species is susceptible to its homologous nucleopolyhedrovirus (Spodoptera frugiperdamultiple nucleopolyhedrovirus, or SfMNPV). Selection of indigenous isolates that are adaptable in each geographical region is important for developing a virus-based pesticide. In this study, an SfMNPV field isolate was obtained from a natural population of the fall armyworm in Hubei, China. Two genotypes were cloned from the field isolate, and one genotype, SfHub-A, which had similar activity to the field isolate and produced significantly more progeny viruses, was considered to be a suitable strain for the commercial production of SfMNPV. This information will be valuable for developing a virus-based pesticide against fall armyworm in China.AbstractThe fall armyworm,Spodoptera frugiperda, is a new invading pest in China. The baculovirusSpodoptera frugiperdamultiple nucleopolyhedrovirus (SfMNPV) is a pathogenic agent of the fall armyworm and a potential agent for its control in integrated pest management strategies. In this work, we analyze the molecular and biological characteristics of an SfMNPV isolate collected from maize in China (SfMNPV-Hub). Two genotypes were further isolated from SfMNPV-Hub by an in vivo cloning method. The PstI profile of one genotype (SfHub-A) was similar to genotype A of the SfMNPV Colombian isolate, and the other (SfHub-E) was similar to genotype E of the Colombian isolate. The bioactivity of SfHub-A against second-instarS. frugiperdalarvae was not significantly different from that of SfMNPV-Hub, whereas SfHub-E was 2.7–5.5 fold less potent than SfMNPV-Hub. The speed of kill of SfHub-E was quicker than SfMNPV-Hub, while SfHub-A acted slower than SfMNPV-Hub. Occlusion body (OB) production of SfHub-A in anS. frugiperdacadaver was significantly higher than that of SfMNPV-Hub, while SfHub-E yielded far fewer occlusion bodies (OBs) in the host larvae. These results provide basic information for developing a virus-based pesticide against the invading pestS. frugiperda.Keywords:SfMNPV;field isolate;genotype;molecular characterization;biological activity;OB yield
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FOOD CHEMISTRY
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2021
·
IF 7.514
Qing Han,Ying Sun,Kangwei Shen,Yan Yan,Xuejun Kang
Based on packed-fiber solid-phase extraction and HPLC-DAD, a simple analytical method for the determination of seven synthetic dyes has been successfully developed. Polystyrene/polypyrrole (PS/PPy) fibers were obtained via electro-spinning of polystyrene skeletal nanofibers , followed by the oxidation with FeCl 3 to trigger the polymerization of pyrrole and the deposition of polypyrrole coatings on PS fibrous skeleton fibers. The relationship between the extraction performance of the fibers and the electrospinning process at different humidities was investigated based on morphologic study and BET surface area. In the extraction process, purification , concentration, and desorption could be accomplished in one step. The established method exhibited good sensitivity, selectivity, reproducibility, and good efficiency for synthetic dyes in casual snacks (preserved fruit, flavored yogurt, and fruity hard candy) samples. With optimal conditions, the LODs (S/N = 3) were 2.4 to 21.09 ng mL −1 , and linearities were acceptable in liquid matrix and solid matrices. The recoveries were 93.9–103.9%.
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TALANTA
·
2020
·
IF 5.339
Biao Ma,Junjie Chi,Chengtao Xu,Ying Ni,Chao Zhao,Hong Liu
Perspiration contains valuable information indicating physiological health. For most wearable perspiration sensors, the sensing element contacts with skin directly. Yet lack of precise fluidic manipulation unit limits accurate and continuous analysis considering perspiration aggregation, evaporation loss and electrolyte reabsorption by sweat glands. The potential skin irritation caused by the chemicals in the sensor is also a safety concern. In this work, we report a wearable microfluidic device with fluidic manipulation unit based on capillary force to address these issues. Inspired by wicking materials for wiping perspiration in our daily life, herein, we use biocompatible threads to collect perspiration by capillary absorption. Then the collected perspiration was spontaneously delivered to a hydrophilic microfluidic channel, forming a continuous flow. Electrodes were embedded in the microfluidic channel for continuous electrochemical analysis and to avoid the direct skin contact. On-body tests demonstrated that continuous perspiration collection, transportation and analysis of Na + as a proof-of-concept analyte can be achieved using the pump-free epidermal microfluidic device.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 18
·9160-9167
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IF 11.301
Jingjing Chen,Jie Zhang,Xiaoli Wu,Xulin Cui,Wenpeng Li,Haoqin Zhang,Jingtao Wang,Xing-Zhong Cao,Peng Zhang
Interfacial polymerization is a classical method for the preparation of thin-film composite (TFC) membranes. However, facile and controllable fabrication remains a grand challenge. Here, a dual-needle electrostatic atomization strategy is presented to atomize aqueous and organic phases into droplets respectively, and then a polymerization reaction occurs at interfaces. This method shows excellent controllability over the membrane nanostructure: the monomer ratio determines compactness and the monomer amount governs thickness. Particularly, a hierarchically structured IP layer is developed by regulating the monomer ratio, where the loose layer, a low-resistance region, supports the formation of an ultrathin dense layer for rejection. And the hierarchical nanostructure is proved by positron annihilation spectroscopy, CO2 adsorption, etc. We demonstrate that an IP layer with a 13.8 nm-thick dense layer readily realizes ultrafast solvent permeance (56.9 and 23.7 L m−2 h−1 bar−1 for acetone and water, respectively) and complete rejection for acid yellow 14 (1.9 nm). Such a performance is superior to that of most reported TFC membranes and overcomes the general permeation–rejection trade-off effect. Moreover, this hierarchically structured membrane displays excellent operating stability, pressure stability and cycle stability, especially solvent resistance over 30 days. Briefly, such a strategy endows the membrane with accurate regulation from chemical components to the physical structure, paving the way for the design of next-generation TFC membranes.
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ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Shengyang Pan,Min Chen,Limin Wu
Although self-healing superhydrophobic surfaces have aroused much attention due to their repairable wetting properties and wide applications, the realization of dual healing of both microstructure and surface chemistry remains challenging. Herein, we develop a novel superhydrophobic surface composed of a shape memory micropillar array decorated by pH-responsive capsules encapsulated with fluoroalkylsilane. Owing to the shape memory effect of micropillar and the encapsulated surface chemistry healing agent fluoroalkylsilane, the obtained surface can not only repair the damaged surface chemistry after acid stimuli, but also restore the crushed surface microstructures by heat.
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CHEMICAL ENGINEERING SCIENCE
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2020
·
IF 3.871
Qi Wang,Xiaoli Wu,Jingjing Chen,Wenpeng Li,Haoqin Zhang,Jingtao Wang
Two-dimensional (2D) lamellar membranes hold a broad prospect for separation applications. However, their design and development need controllable fabrication of ultrathin and stable lamellar membranes. Here, an organic-inorganic lamellar composite membrane with layer-by-layer graphene oxide (GO) and polyethyleneimine (PEI) structure was fabricated through a dual-needle electrostatic atomization strategy. The GO nanosheets work as skeleton to ensure ultrathin and defect-free membrane structure, while PEI cross-links adjacent GO nanosheets for structure stability. Importantly, this membrane achieves fast polar solvent permeance: 46.2 and 146.8 L m −2 h −1 bar −1 for water and acetone, outperforming most reported GO-based membranes. Meanwhile, the ordered and cross-linked interlayer channels provide accurate size sieving for industrial dyes (larger than 1.6 nm) with the rejection of above 96%. Significantly, this lamellar composite membrane displays excellent structure, operation, pressure, and cycling stabilities, which are difficult for traditional lamellar membranes.
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AICHE JOURNAL
·
2019
·Vol. 66
·期 4
·e16879
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IF 3.463
Xue-Li Cao,Jia-Lin Guo,Jing Cai,Mei-Ling Liu,Susilo Japip,Weihong Xing,Shi-Peng Sun
The considerable performance enhancement of small molecule-sieving nanofiltration membrane has been achieved by the functional combination between host–guest chemistry and interfacial polymerization (IP) for the first time in this work. First, the water-insolubility of cucurbit[6]uril (CB6) was ameliorated by constructing host–guest complex (CB6-PIP) with piperazine. Second, the incorporation of water-soluble CB6-PIP in the selective layer via IP leads to the generation of not only the enlarged conventional polyamide network tunnels but also rotaxane tunnels. Such enrichment of solvent transport tunnels contributes to an amazing pure water permeability of 15.5–25.4 Lm −2 bar −1 h −1 , three times higher than that of traditional polyamide membranes, with a high R/MgSO 4 of 99.5–92.5%, perfect SO 4 2− /Cl − selectivity due to the electronegative contribution of CB6, as well as untapped potential in organic solvent nanofiltration. This work not only provides a fire-new strategy to design new type of NF materials but also promotes the application of CBs in many other fields.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Baoyi Wu,Yukun Jian,Xiaoxia Le,Han Lin,Shuxin Wei,Wei Lu,Jiawei Zhang,Afang Zhang,Chih-Feng Huang,Tao Chen
Inspired by the high importance of hollow structures in nature such as blood vessels and bamboos in matter transportation, properties enhancement, or even survival of living creatures, the creation of hollow materials remains of considerable interest. However, constructing hollow unique living-like soft and wet polymeric hydrogels with desirable structures and functionalities is still a big challenge. Here, we reported a robust and effective strategy to fabricate complex three-dimensional (3D) hollow polymeric hydrogel with designed shape and function diversity on the basis of supramolecular interactions. By placing a Ca2+ included gelatin core into the solution of alginate, hydrogel shell could be formed along with the shape of the gelatin core via coordination between alginate chains and Ca2+ diffused from gelatin. The hollow hydrogel could finally be obtained by dissolving the gelatin core. Various complex 3D hollow structures could be achieved by designing/constructing assembled gelatin core as a building block with adjustable supramolecular metal coordination position and strength. Moreover, hollow hydrogels with function diversity could be developed by introducing functional polymers or nanoparticles into the hydrogel wall. This work has made important progress in developing hollow polymeric hydrogel with desirable structures, shapes, and various functional applications including soft actuators and chemical reaction containers.
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PEST MANAGEMENT SCIENCE
·
2019
·Vol. 76
·期 4
·1363-1370
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IF 3.255
Chengfeng Lei,Shili Yang,Wenxiao Lei,Innocent Nyamwasa,Jia Hu,Xiulian Sun
BACKGROUND Baculoviruses provide long-lasting control of crop pests and are harmless to humans and non-target animals, making them attractive bioinsecticides. Autographa californica multiple nucleopolyhedrovirus (AcMNPV) has a wide-host range and is one such commercial bioinsecticide, but its low infectivity to older larvae and less-sensitive species precludes its large-scale application. We sought to improve the infectivity of AcMNPV. RESULTS Two enhancing factors, the truncated enhancin from Agrotis segetum granulovirus and GP37 from Cydia pomonella granulovirus, were expressed in fusion with the N-terminal and middle domain of the polyhedrin envelope protein of AcMNPV. Western blotting and immunoelectron microscopy analysis indicated that the enhancing factors were expressed on the occlusion bodies of the resulting AcMNPV variants. Bioassays showed that the median lethal doses of the recombinant viruses were 3.9-fold to 7.4-fold lower than those of the wild-type virus against the second and fourth instar of Spodoptera exigua larvae. The yields of occlusion bodies from the two recombinants in S. exigua larvae were comparable with those of the wild-type virus both in vitro and in vivo . Further bioassays showed that the AcMNPV variants fusing the enhancing factors were incapable of infecting the second instar larvae of S. litura , Helicoverpa armigera , and Pyrausta nubilalis , which were not sensitive to the wild-type AcMNPV. CONCLUSION These genetically modified AcMNPV variants exhibited an enhanced infectivity and may offer better baculovirus control of crop pests. © 2019 Society of Chemical Industry
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2026
·
IF 4.1
Qi Junfeng,Liu Junhe,Hu Chanjuan,Wang Qingqing,Guo Yanhong,Zhang Mengdie,Hu Li,Lin Bin,Li Wansen
Excessive addition of ethyl maltol (EMA) to foods poses potential health risks, highlighting the need for reliable monitoring. Herein, an integrated Fe(III)-driven liquid-phase microextraction (LPME)–spectrophotometry system was developed for selective and high-throughput EMA determination. Fe(III) in the acceptor phase served dual roles: as a chemical trap achieving >90% extraction efficiency and as an in situ chromogenic probe enabling direct detection. This unique design combines membrane-mediated matrix exclusion with coordination-assisted extraction, resulting in enhanced sensitivity and improved resistance to matrix interference. Density functional theory calculations revealed that Fe(III) facilitated the forward extraction by reducing the transmembrane transfer free energy barrier while suppressing back-extraction via weakening EMA–membrane solvent interactions. Under the evaluated conditions, the system offered a broad linear range (7.8–1500 μM, R 2 > 0.999), low detection limit (0.67 μM), and satisfactory selectivity toward structural analogues. Validation in diverse food matrices yielded recoveries of 88–107% with good agreement with HPLC–UV ( R 2 > 0.99). The minimal solvent consumption, high throughput, and favorable greenness further highlight its practical utility. More than an EMA detection method, this work provides a proof-of-concept for the coordination-driven LPME strategy that intrinsically integrates sample preparation with in situ signal generation, offering new insights into the design of a mechanism-driven microextraction system. Graphical abstract
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Abdul Ghaffar,Muhammad Hassan,Oleksiy V. Penkov,Cafer T. Yavuz,Kemal Celebi
Molecular separations involving solvents and organic impurities represent great challenges for environmental and water-intensive industries. Novel materials with intrinsic nanoscale pores offer a great choice for improvement in terms of energy efficiency and capital costs. Particularly, in applications where gradient and ordered separation of organic contaminants remain elusive, smart materials with switchable pores can offer efficient solutions. Here, we report a hierarchically networked porous organic cage membrane with dynamic control over pores, elucidating stable solvent permeance and tunable dye rejection over different molecular weights. The engineered cage membrane can spontaneously modulate its geometry and pore size from water to methanol and DMF in a reversible manner. The cage membrane exhibits ≥585.59 g mol–1 molecular weight cutoff preferentially in water and is impeded by methanol (799.8 g mol–1) and DMF (≈1017 g mol–1), reflecting 36 and 73% change in rejection due to self-regulation and the flexible network, respectively. Grazing incidence X-ray diffraction illustrates a clear peak downshift, suggesting an intrinsic structural change when the cage membranes were immersed in methanol or DMF. We have observed reversible structural changes that can also be tuned by preparing a methanol/DMF mixture and adjusting their ratio, thereby enabling gradient molecular filtration. We anticipate that such cage membranes with dynamic selectivity could be promising particularly for industrial separations and wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wenjing Geng,Zechen Zhang,Qi Guo,Yuchen Liu,Xinxin Ye,Hui Zhang,Chen Fu,Fengguang Liu,Yujun Zhu,Cheng Chen
Graphene oxide (GO) nanosheet-based membranes have attracted attention for molecular separation, yet the challenge of balancing permeance and rejection limits practical use. We report a method that involves MoS 2 nanosheets assembly onto GO nanosheets to create a tailoring GO-based nanofiltration membrane. This strategy aims to enhance the high-performance molecular separation capabilities of the GO membrane. The resulting tailoring nanofiltration membrane demonstrates significant improvements: a 27-fold permeance increase (744 L m −2 h −1 bar −1 ) with 98% rejection for Brilliant Yellow in water, and a 55-fold permeance increase (436 L m −2 h −1 bar −1 ) with 99% rejection for Rose Bengal in acetone compared to GO membranes at the same mass density. Incorporating MoS 2 nanosheets enhances interconnections and introduces extra nanochannels, improving permeability without sacrificing separation efficiency. Materials studio simulations confirm stable and enhanced nanochannels in facilitating effective molecular separation. This technique holds promise for enhancing purification processes using GO-based membranes.
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