INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ling Zheng,Farzad Seidi,Weibing Wu,Yuanfeng Pan,Huining Xiao
An effective way of improving the efficiency of agrochemicals and improving crop yield and quality is by slow or sustained release , which is conducive to environmental protection. Meanwhile, the excessive amount of heavy metal ions in soil can create toxicity in plants. Here, we prepared lignin-based dual-functional hydrogels containing conjugated agrochemical and heavy metal ligands through free-radical copolymerization. The content of the agrochemicals (including plant growth regulator 3-indoleacetic acid (IAC) and herbicide 2,4-dichlorophenoxyacetic acid (DCP)) in the hydrogels were tuned by changing the hydrogel composition. The conjugated agrochemicals could slowly release through the gradual cleavage of the ester bond. As a result of the release of the DCP herbicide, the growth of lettuce was effectively regulated, thus confirming the feasibility and effectiveness of this system in application. At the same time, due to the presence of metal chelating groups (such as COOH, phenolic OH, and tertiary amine) the hydrogels could act as adsorbents or stabilizers towards heavy metal ions for improving the soil remediation and preventing the adsorption of these toxic metals by plant roots. Specifically, Cu(II) and Pb(II) could be adsorbed >380 and 60 mg/g, respectively.
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高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Hua Huang,Hailun Liu,Ling Wang,Xu Xiang
Litchi fruit is susceptible to pericarp browning, which is largely due to the oxidation of phenols in pericarp. However, the response of cuticular waxes to water loss of litchi after harvest is less mentioned. In this study, litchi fruits were stored under ambient, dry, water-sufficient, and packing conditions, while rapid pericarp browning and water loss from the pericarp were observed under the water-deficient conditions. The coverage of cuticular waxes on the fruit surface increased following the development of pericarp browning, during which quantities of very-long-chain (VLC) fatty acids, primary alcohols, and n -alkanes changed significantly. Genes involved in the metabolism of such compounds were upregulated, including LcLACS2 , LcKCS1 , LcKCR1 , LcHACD, and LcECR for elongation of fatty acids, LcCER1 and LcWAX2 for n- alkanes, and LcCER4 for primary alcohols. These findings reveal that cuticular wax metabolism may take part in the response of litchi to water-deficient and pericarp browning during storage.
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POLYMER TESTING
·
2022
·
IF 4.931
Qing Li,Yujuan Guo,Chaoliu Ouyang,Shunmin Yi,Sheng Liu
Polydopamine (PDA), also known as artificial melanin, was adopted as ultraviolet absorbent to prepare a series of porous highly fluorinated polyimide/polydopamine (FPI/PDA) films by cyclodehydration via chemical and thermal imidization. The hydrogen bond and porous structure endowed the reinforced thermal, mechanical, UV-shielding and photostability. The initial decomposition and glass transition temperatures of FPI/PDA (1 wt %) film were as high as 461.5 °C and 341.5 °C, respectively beyond pure FPI by 54.1 °C and 26.0 °C. The stress-strain curves indicated that tensile strength and fracture elongation first increased and then decreased with the increase of PDA content, and reached the maximum at 0.5 wt % PDA content, which were 1.41 and 29.47 times of FPI, respectively. UV–vis transmittance spectra, curcumin photolysis and recyclability measurement confirmed the splendid UV-shielding properties with simultaneous excellent visible light transmittance and durability of porous FPI/PDA film. FTIR and AFM manifested its superior photostability with mild variation in carbonyl absorption peaks and surface roughness after 720 h UV irradiation. The above enhancement mechanisms included synergistic UV absorption of porous FPI and PDA, photothermal conversion in a stable FPI, and PDA's free radical trapping, promoting porous FPI/PDA film as an aerospace UV shielding material.
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ChemSusChem
·
2022
·Vol. 16
·期 5
·e202202071
·
IF 9.14
Xiaozhen Ma,Shuqi Li,Fan Wang,Jialong Wu,Yeyan Chao,Xun Chen,Peng Chen,Jin Zhu,Ning Yan,Jing Chen
Graphical A catalyst-free dynamic covalently cross-linking polyurethane was successfully prepared by a one-step method using untreated lignin. And by adjusting the lignin content and the isocyanate index, the properties of LPUs could be adjusted. Mechanical properties of LPUs could be significantly improved by extrusion. In addition, it exhibited editable shape memory function. Therefore, this paper can provide new ideas for the structural design of lignin-based polyurethanes. Here a new strategy of catalyst-free direct synthesis of covalent adaptable network polyurethanes (LPUs) from lignin with editable shape memory effect is reported. Using unmodified lignin, PEG, and isocyanate under the condition of the isocyanate index less than 1.0 (NCO/OH<1.0), a variety of LPUs are obtained. When NCO/OH=0.8, a stable cross-linked network can be formed (ex. the gel content of LPU50-0.8 was 98±0.3 %). The activation energy ( E a ) value of LPUs is similar to that of polyhydroxyurethanes (PHUs), at around 110 kJ mol −1 . With an increase of lignin content, the LPUs show a transition from ductile fracture to brittle fracture mode. And the mechanical properties of LPUs are significantly enhanced after extrusion processing, with the maximum modulus reaching 649±26 MPa and the maximum toughness up to 9927±111 kJ m −3 . The improvement in mechanical properties is due to the homogenization of complex cross-linked network under the powerful external force of the extruder and the lignin that originally was free in the system participated in the exchange reactions. Moreover, LPUs can also be prepared continuously in one step by using an extruder as the reactor. In addition, LPU50-0.8 has an editable shape memory effect. This study develops a novel method for the synthesis of LPU from lignin with NCO/OH<1.0, showcasing new possibilities for value-added utilization of lignin, and expands the bio-based products portfolio from biomass feedstock to help meet future green manufacturing demands.
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POLYMER TESTING
·
2022
·
IF 4.931
Zichao Wang,Xuan Zhang,Zhenzhen Wu,Tong Wang,Yan Li,Liusiyuan He,Xiuzhong Zhu,Xiaodong Fan
The synthesis, characterization and application of the polymers with functional pendant groups have always been hot topics in the polymer field. A kind of functional polybutadiene (HTPB) derivative containing anthryl and azide groups was synthesized by anthracenic acid and HTPB in the presence of N-bromosuccinimide (NBS) and sodium azide via an electrophilic reaction. Furthermore, the HTPB derivative N 3 -HTPB-AN as a macromolecular main chain was reacted with alkynyl-terminated polytetrahydrofuran (Alk-PTHF) and maleimide-terminated polyethylene glycol (Mal-PEG) through "azide-alkyne" and "Diels-Alder" click reaction to obtain a bottle-brush polymer with the HTPB as the main chain and polytetrahydrofuran and polyethylene glycol as the side chains by one-pot. The bottle-brush polymer could self-assemble into uniform nanommicelles in aqueous solution. Meanwhile, the photoregulated fluorescence resonance energy transfer (FRET) exhibited by the interaction of the micelles assembled by the bottle-brush polymer in water with the dye was studied.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jingyan Ming,Hongquan Fu,Guangxing Yang,Hongjuan Wang,Jiangnan Huang,Feng Peng,Yonghai Cao,Hao Yu
It is still an ongoing challenge to quantitatively determine the number of transferred electrons from carbon supports to metallic catalysts, which is highly related to their catalytic performance. In this work, a facile method combining electrochemical and spectroscopic technologies was proposed to evaluate the electron transfer (ET) reaction rate on carbon nanotubes (CNTs) with defects. Using 7,7,8,8-tetracyanoquinonedimethane (TCNQ) as an electron-accepting molecule, the transferred electrons from CNTs were quantitatively determined through the Beer-Lambert law and coulometric analysis. It was revealed that the edge defects on CNTs are beneficial for the ET reaction rate, due to the lower local work function. Hence, the defective CNTs supported Pt nanoparticles (Pt/ d -CNTs) performed the higher activity in the electrooxidation of glycerol, suggesting the influence of the ET ability of d -CNTs on the electronic metal-support interaction. This scenario is supported by density function theory calculation and X-ray photoelectron spectroscopy. Our results pave a new way to the facile evaluation of electronic metal–carbon interaction.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Lei Di,Shengyu Cheng,Yan Zhu,Yueying Jin,Chao Qi,Lingli Zhang,Minghui Zhang,Xin Wang,Yu Han,Xi-Ling Li,Jun Zhe Min
We developed a novel chiral mass spectrometry derivatization reagent (S)-(3-(4-carboxythiazolidin-3-yl)-3-oxopropyl) diphenylsulfonium (CTOD) with a positively charged sulfur-containing structure for high-sensitivity detection of the chiral resolution of amino acid enantiomers. CTOD reacted with DL-amino acids at 60 o C for 60 min to generate the corresponding diastereomers, fifteen chiral amino acid-derived products were separated. Resolution (Rs) values were of the range 1.54-4.36, except Asn 1.07, achieving good separation. A highly sensitive and selective UHPLC-MS/MS method for the simultaneous determination and chiral separation of five chiral amino acids (Pro, Ala, Glu, Asp, and Phe) based on CTOD derivatization was established and applied to the detection of chiral amino acids in different wines. The diastereomeric resolution of the five amino acids was 1.71–5.42, and an excellent linear relationship was obtained in the range of 0.25–500 pmol (R 2 ≥0.9993). The detection limit was 0.05–0.25 pmol. The intra- and inter-day precisions were 0.51–5.76% and 0.78–5.18%, respectively, and the average recovery was 90.03–99.99%. In addition, the metabolic concentration of chiral amino acids was monitored after drinking red wine and white wine, and the fitting curve of metabolic concentration was drawn.
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Frontiers in Plant Science
·
2022
·
IF 6.627
Chen Jiabao,Guo Long,Yang Guiya,Yang Aitong,Zheng Yuguang,Wang Lei
Ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS) and gas chromatography-mass spectrometry (GC-MS) were applied to analyze metabolites in perilla leaves (PLs) during its developmental process. In total, 118 metabolites were identified, including volatile and non-volatile compounds, such as terpenoids, sugars, amino acids, organic acids, fatty acids, phenolic acids, flavonoids, and others. Principal component analysis (PCA) indicated great variations of metabolites during PLs development. Clustering analysis (CA) clarified the dynamic patterns of the metabolites. The heatmap of CA showed that most of the detected metabolites were significantly accumulated at stage 4 which is the pre anthesis period, and declined afterwards. The results of the present study provide a comprehensive overview of the metabolic dynamics of developing PLs which suggested that pre anthesis period is the best harvest time for PLs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Haibo Huang,Long Mao,Wei Wang,Zhihan Li,Chengrong Qin
As a traditionally used packaging material, natural cellulose-based paper has poor barrier properties to water and oxygen, which severely limits its wide application in food packaging. In this study, we report a new sustainable approach to producing hydrophobic, high-barrier, and antibacterial packaging materials from cellulose paper. In this process, commercially available microcrystalline cellulose was first modified by long-chain stearic acid to form hydrophobic microcrystalline cellulose ester and then mixed with stearic acid as filler in the subsequent surface coating of bagasse fibre paper. The microcrystalline cellulose ester/stearic acid-coated paper (MSP) exhibited good water repellency and oxygen barrier activity due to a continuous hydrophobic film that formed, which completely covered the pores of the original bagasse fibre paper. The coated MSP sample also showed excellent dimensional stability in water and a good wet tensile strength of 16 MPa. In addition, poly(hexamethylene guanidine) (PHMG) was chemically grafted onto the free carboxyl groups of the MSP surface layer, and the resulting MSP- g -PHMG samples exhibited excellent antibacterial activity against Escherichia coli and Listeria monocytogenes . The biodegradable cellulose-based MSP- g -PHMG sample significantly delayed the decay of raspberry during storage, indicating its potential application in food packaging.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Qian Zhou,Bingxiao Feng,Lining Hao,Chao Pan,Hongbing Song,Hengjun Gai,Quanhong Zhu,Meng Xiao,Tingting Huang
The removal of oil from coal pyrolysis wastewater persists to be a challenging problem. Thus, this study proposes a new scheme that integrates the adsorption of oil using fibers and subsequent centrifugation or elution to achieve efficient oil–water separation. Based on their stable chemical property, PP and were selected as the substrates for drawing the fibers. In addition, PVDF and PTFE were explored to modify the wettability of PP and PE. The performances of as-prepared fibers were tested for removing oil from wastewater in both batch and continuous modes. Among all the fibers, the PVDF-modified PP fibers exhibited the best performance. For PP-based fibers with 5 wt% PVDF, the saturated oil-removal efficiency reached 92.24 % in case of the simulated wastewater and 81.10 % for the actual wastewater. Given that the oil content in coal pyrolysis wastewater was ~2000 ppm, the residual oil content in the outlet water would be ~380 ppm, which satisfies the requirement of the subsequent treatment process. Furthermore, the PVDF-modified PP fibers exhibited excellent reusability and stability to defy various environmental corrosions. The separation of oil and water based on the adsorption by fibers offers promising prospect to remove oil from coal pyrolysis wastewater. In addition, we derived a formula to calculate the oil contact angle under water based on Young's equation using several measurable parameters. As the calculation results were consistent with real scenarios, this derived formula can provide quantitative guidance for material modification in coal wastewater treatment .
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MEDICINAL CHEMISTRY RESEARCH
·
2022
·Vol. 32
·期 2
·288-313
·
IF 2.351
Zhang Yuanwen,Zheng Yueming,Wu Qingqing,Tian Fuyun,Ma Chuanjun,Xu Haiyan,Zhan Li,Gao Zhaobing,Zhao Guilong,Ti Huihui
A clinical therapy for chronic neuropathic pain is urgently needed, and the voltage-gated calcium channel (VGCC) α2δ subunit is among the most promising therapeutic targets. To intensively explore the structure-activity relationship (SAR) of the lipophilic moiety in VGCC α2δ subunit ligands (gabapentinoids), we designed and synthesized 11 bicyclic and monocyclic derivatives based on mirogabalin, a third-generation VGCC α2δ subunit ligand. The competitive binding of the synthesized compounds to the human VGCC α2δ-1 subunit was measured in vitro, and the results demonstrated that the lipophilic moiety size was strictly limited in gabapentinoids, in which conformationally rigid bicylo[3.2.0]heptane/heptene with a cis -fusion was the most preferred structure. In contrast, monocyclic cyclobutane was associated with a markedly decreased binding affinity except in 4 (IC 50 = 15.2 nM), in which the substituents could mimic the rigid conformation of bicylo[3.2.0]heptane/heptene; heteroatoms in the lipophilic moiety were detrimental to the binding affinity ( 2 , IC 50 > 729 nM). The SAR findings obtained in the present study will be valuable for designing novel gabapentinoid drugs to treat chronic neuropathic pain in the future. Graphical abstract
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JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
·
2022
·
IF 3.916
Yong Pan,Chaoqin Ren,Gan Wang,Yanjun Wang,Xin Zhang,Juncheng Jiang,Chi-Min Shu
Aiming at the green and sustainable energy substitution and supply, biomass valorization has become a potential strategy to face the energy crisis and increasing demand all over the world from long-term perspectives. Among the bio-based chemicals, γ-valerolactone (GVL) production from hydrogenation of levulinic acid (LA) and its esters has attracted great interests due to its wide applications, such as fuel, solvent, and additives. However, the safety evaluation for this hydrogenation reaction has received few attentions. To fill this gap, thermal hazard evaluation for GVL production from LA hydrogenation by using formic acid (FA) as hydrogen donor was first performed. The process conditions were optimized by using orthogonal experimental method for further calorimetry study. Thermal stability of chemicals and thermal risk of reaction process under adiabatic conditions were investigated by applying differential scanning calorimetry and accelerating rate calorimeter Phi-Tec II, respectively. The results revealed that the chemicals were stable in temperature range from 30 to 250 °C except FA due to its evaporation and decomposition with endothermic behaviors. The reaction process under isothermal and adiabatic conditions demonstrates that the decomposition of FA was rapid and followed by the hydrogenation of LA to GVL. Based on kinetic model under adiabatic conditions and risk matrix , the thermal runaway risk was found to be medium, indicating that certain safety measures should be properly designed and taken for loss prevention. This work could benefit the safety design and thermal risk prevention for GVL production by using FA as hydrogen donor.
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危险品化学品经营许可证（带存储）