SCIENTIA HORTICULTURAE
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2022
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IF 4.342
Xiaoya Tao,Qiong Wu,Suqing Huang,Beiwei Zhu,Feng Chen,Bin Liu,Luyun Cai,Linchun Mao,Zisheng Luo,Li Li,Tiejin Ying
Primary metabolites play crucial roles during fruit development and ripening. Phytohormone abscisic acid (ABA) has been reported to regulate postharvest tomato fruit ripening. However, knowledge about ABA in regulating primary metabolism in tomato fruit is obscure. In the present research, cherry tomato fruit were infiltrated with 1.0 mM ABA or deionized water under vacuum, and kept in darkness for 15 d. The changes of the relative contents of sugars, organic acids, and amino acids, as well as the expression levels of key genes involved in sugar and organic acid metabolisms, were analyzed. Results showed exogenous ABA accelerated tomato fruit ripening, accompanying with the enhanced changes of fruit color and firmness, the higher levels of respiration rate and ethylene production. Meanwhile, exogenous ABA enhanced the relative levels of some primary metabolites, such as glucose, lyxose and fructose; citric acid, citramalic acid, ascorbic acid and gluconic acid; also serine, pyroglutamic acid, GABA, glutamic acid, aspartic acid, asparagine and glutamine (1.69-3.25 folds). Furthermore, exogenous ABA stimulated the expression levels of most key genes (such as SPSs, SPP2, TIV1, Lins, SUSs, PPCs, MDH and CS ) (log 2 fold change ranged from 1.06 to 3.64). Results indicate ABA is systematically involved in the regulation of primary metabolism, which may provide valuable information for exploring technical means to improve tomato taste and flavor.
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Green Energy & Environment
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2022
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IF 12.781
Bolin Wang,Chunxiao Jin,Shujuan Shao,Yuxue Yue,Yuteng Zhang,Saisai Wang,Renqin Chang,Haifeng Zhang,Jia Zhao,Xiaonian Li
Rational design of catalytic sites to activate the C C bond is of paramount importance to advance acetylene hydrochlorination. Herein, Cu sites with electron-rich and electron-deficient states were constructed by controlling the impregnation solutions. The π electrons flowing from acetylene to Cu site are facilitated over the electron-deficient Cu sites, achieving high activation of C C bond. The contradiction between the increased activation of acetylene required for enhanced catalytic activity and the resistance of Cu site to reduction by acetylene required for maintaining catalytic stability can be balanced by establishing strong interactions of Cu site with pyrrolic-N species. The catalytic activity displays a volcano shape scaling relationship as a function of Cu particle size. Tribasic copper chloride is concomitantly generated with the construction of electron-deficient Cu sites. The H–Cl bond of HCl can be activated over the tribasic copper chloride, accelerating the surface reaction of vinyl chloride production. This strategy of inducing electron deficiency provides new insight into the rational design of catalysts for the synthesis of vinyl chloride with a high catalytic performance.
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FUEL
·
2022
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IF 8.035
Linjie Guan,Chengming Huang,Dingmei Han,Binbin He,Linhua Zhu,Dedong He,Yi Mei,Yun Zu
A series of HZSM-5 zeolites are fabricated to make it cross-link with an external ultrathin siliceous layer by chemical liquid deposition and the corresponding thickness is measured by TEM and XPS analysis. In situ FTIR experiments disclose that the external surface acidic sites of HZSM-5 zeolite can be covered even by siliceous monolayer (0.7 ∼ 1.3 nm, HZ5-S1). In comparison to parent HZSM-5, the catalytic cracking performance of n-butane over the modified zeolites are evidently enhanced. In particular, the n-butane conversion rate per Brønsted acid site over the HZ5-S2 (16.02 min −1 ) at 550 °C is 2.82 times than that over the HZSM-5 (5.68 min −1 ). Meanwhile, the diffusion properties of n-butane over the zeolites are quantified by in situ FTIR spectroscopic analysis. Negative correlation between steady-state diffusivity and n-butane conversion rate per Brønsted acid site can be found, which unravels the origin of the progressive decrease in the catalytic stability. Under comparable conditions, more advantages can be greatly achieved by HZ5-S1 catalyst in the catalytic activity and the yields to light olefins due to the benign diffusivity and the elimination of external surface acidic sites. This study can provide a guidance for the understanding of diffusion intensification and the rational design of superior catalyst for the catalytic cracking reactions of alkanes.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Yin Yan,Lihe Zhang,Xi Zhao,Siyu Zhai,Qian Wang,Cui Li,Xu Zhang
The study presents the preparation of novel biocomposites based on different lignin fractions and polylactic acid (PLA). Based on the improvement of PLA mechanical properties, we proposed a process to assemble a series of lignin samples and PLA matrix using melt blending to investigate the effects on PLA properties from the perspective of the structure and molecular weight for lignin. The lignin was extracted from pine residue using deep eutectic solvent (DES) and was subjected to fractionation with ethanol and acetone as well as esterification modification with succinic anhydride (SAn). The treated lignin samples were used as additives, which not only improved the mechanical properties of PLA on the basis of retaining its thermal stability , but also granted excellent antimicrobial and biocompatibility properties. The results showed that the molecular weight of lignin was negatively correlated with the phenolic hydroxyl content, and the mechanical properties of the composites were also significantly affected by different molecular weights of lignin, indicating that the inhomogeneity of lignin affects its value-added utilization. The enhanced mechanical properties, antibacterial effect, and steady biocompatibility provide potential possibilities for lignin-based composites in biomedical applications.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2022
·Vol. 24
·期 4
·1570-1577
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IF 11.034
Ruixue Yangcheng,Jiansu Ran,Zhaohui Liu,Yuntong Cui,Jianjian Wang
Efficient production of high value-added chemicals and biofuels via low-temperature chemoselective HDO of lignin derivatives in water is still a challenge. Here, we construct a low-cost, active and stable Pd/PCE catalyst using phosphoric acid-modified commercial Celite (PCE) as the support, and this catalyst exhibits excellent activity in low-temperature HDO of vanillin as well as other lignin derivatives in water. The superior catalytic performance is due to the presence of P species on the surface of Pd/PCE, accelerating the selective conversion of the intermediate into the final product. Detailed experimental and mechanistic studies reveal that the rapid conversion of the intermediate to the final product proceeds via a free-radical process in an interfacial microenvironment created by intimate interacting between the P species and Pd NPs. The insights of this work provide a new low-cost catalytic system for efficient production of valuable chemicals and future biofuels from lignin derivatives.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Weidong Niu,Yunfeng Guo,Wei Huang,Lili Song,Zefang Xiao,Yanjun Xie,Yonggui Wang
To promote the replacement of nondegradable petrochemical-based polymers with green polylactic acid (PLA) materials, aliphatic chains-grafted cellulose nanocrystals (ECNCs) were prepared and used as nanofillers to overcome the disadvantage of poor toughness of PLA. ECNCs with core-corona structures were obtained by modifying cellulose nanocrystals (CNC) with valeryl chloride, octanoyl chloride, dodecanoyl chloride, and stearoyl chloride. ECNCs consists of a cellulose crystalline core and a soft esterified corona layer with aliphatic chains. Among the diverse ECNCs, the obtained EOCNC by esterification of octanoyl chloride exhibited most efficient enhancement of the toughness of PLA. Specifically, PLA/EOCNC-1% film displayed the best elongation at breakage of 108%, which was 6.4 times that of pure PLA. The esterified outer layer of ECNCs, which improves the interfacial compatibility, is one of the key factors contributing to toughening of PLA. These ECNCs with core-corona structure open up new directions for the application of PLA advanced composites.
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LANGMUIR
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2022
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IF 4.331
Xin Kou,Yutian Ma,Congming Pan,Yong Huang,Yulai Duan,Ying Yang
Ionic polymers have been proven to be promising adsorbents in recovering Au(III) due to their advantages of simple synthesis and high adsorption efficiency. However, the unclarity of the relationship between the adsorption ability of ionic polymers and their cationic structures hinders further optimization of their adsorption performance. This study synthesized a series of ionic polymers with pyridinium, imidazolium, piperidinium, pyrrolidinium, and triethylammonium cations to discover the effects of the cationic structure on their adsorption properties. Experimental results show that the existence of anion−π interaction between aromatic cations and [AuCl4]− makes the aromatic cations–anion interaction stronger, which does not enhance the adsorption performance of the aromatic-based ionic polymer. This is due to the charge delocalization in the aromatic ring, resulting in a lower electrostatic potential (ESP) of aromatic cations than that of aliphatic cations with a localized charge. The higher the ESP of cations, the better the adsorption performance of the corresponding ionic polymer. This study serves as a deep understanding of the cationic structure–adsorptive performance relationship of the ionic polymer at the molecular level and further provides a theoretical guidance to optimize the adsorption performance of ionic polymers.
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Journal of Materials Chemistry B
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2022
·Vol. 10
·期 16
·3039-3047
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IF 7.571
Si Yu Zheng,Yifeng Ni,Jiahui Zhou,Yucong Gu,Yiting Wang,Jingfeng Yuan,Xiaoyu Wang,Dong Zhang,Shanqiu Liu,Jintao Yang
Bacterial infections from biomedical devices pose a great threat to the health of humans and thus place a heavy burden on society. Therefore, developing efficient antibacterial surfaces has attracted much attention. However, it is a challenge to identify or develop a combination that efficiently integrates multiple functions via topological tailoring and on-demand function-switch via non-contact and noninvasive stimuli. To resolve this issue, a highly hydrophilic comb polymer brush was constructed here based on supramolecular host–guest recognition. Azobenzene (azo)-modified antifouling and antibacterial polymers were incorporated into cyclodextrin (CD)-modified antifouling polymer brushes grafted on the surface. The surface thus obtained possessed excellent antifouling performance with a low bacterial density of ∼6.25 × 105 cells per cm2 after 48 h and exhibited a high efficiency of ∼88.2% for killing bacteria. Besides, irradiation with UV light resulted in the desorption of the azo-polymers and a release of ∼85.1% attached bacteria. Irradiating visible light led to the re-adsorption of azo-polymers, which regenerated the fresh surface; the process could be repeated for at least three cycles, and the surface still maintained low bacterial attachments with a cell density of ∼7.10 × 105 cells per cm2, high sterilization efficiency of ∼93.8%, and a bacteria release rate of ∼83.1% in the 3rd cycle. The photo-switchable antibacterial surface presented in this research will provide new insights into the development of smart biomedical surfaces.
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CELLULOSE
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2022
·Vol. 29
·期 4
·2497-2511
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IF 6.123
Xu Dezhong,Cheng Yanan,Wu Shuai,Zou Qiuxia,Mondal Ajoy Kanti,Ning Dengwen,Huang Fang
In this work, tunicate cellulose nanocrystals (tCNCs) were extracted from the tunicate by bleaching and acid hydrolysis. They were used as filler in the preparation of sodium alginate-based enteric capsules. The addition of tCNCs with a high aspect ratio (65) rendered the enteric capsule excellent physical properties. Compared with the control sample, when the addition of tCNCs were 10% (wt), the water contact angle of the capsule was enhanced by 46.0%, the opacity was increased by 356.8%, the maximum tensile stress was increased by 142.6%, the modulus of elasticity was increased by 240.3%, and the elongation at break was increased by 133.8%. In the in vitro degradation experiments, the capsule hardly degraded in the gastric environment (pH 1.2), while in the intestinal environment (pH 6.8), the degradation became slower with the increase of tCNC content, which was consistent with the properties of the enteric capsule. This research developed a new direction for the application of tCNCs in the pharmaceutical material productions. Graphical abstract
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
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2022
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IF 6.51
Yu Zou,Quan Zhou,Yinan Zhao,Defu Zhi,Huiying Chen,Rui Wang,Benzhi Ju,Shubiao Zhang
Ionizable lipids are the leading vectors for gene therapy. Understanding the effects of molecular structure on efficient gene delivery is one of the most important challenges for maximizing the utility of such lipid vectors. We synthesized an array of pH-responsive and ionizable lipids to investigate the relationship between lipid structure and activity. The optimized lipid (EDM) has double tertiary amines in the headgroup and an ester linker. EDM exhibited efficient DNA and siRNA delivery to, and gene silencing of, A549 cells. EDM has a p K a value of 6.67, which enabled it to quickly escape from the endosome after entering the cell; the ester linkages rapidly degraded and enabled gene release into the cytoplasm. EDM also delivered IGF-1R siRNA to inhibit tumor growth and induce cancer cell apoptosis by efficient inhibition of IGF-1R expression in mice. Our study on the structure–activity relationships of ionizable lipids will facilitate clinical applications.
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Journal of Water Process Engineering
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2022
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IF 7.34
Yunfen Shi,Yinyan Zhong,Zhong Sun,Xiaozhen Ma,Shuqi Li,Fan Wang,Yupeng An,Qing Luo,Jin Zhu,Jing Chen,Ning Yan
Taking effective measures to remove oil and organic pollutants from water has become a top priority. In this study, we developed a novel superhydrophobic and magnetic lignin-based polyurethane foam for highly efficient adsorption of organic pollutants and removal of viscous crude oil from water. The superhydrophobic bio-based magnetic foam was prepared by the addition of Fe 3 O 4 nanoparticles during the foaming process followed by the immersion in an octadecyltrimethoxysilane (OTMS) solution. After modification by OTMS, the water contact angle (WCA) of the foam adsorbent was increased by 37.1°, exhibiting a high WCA of 156°. Fe 3 O 4 nanoparticles endowed the foam with excellent photo-thermal performance, allowing the efficient adsorption of both crude oil and a wide range of organic solvents. The foam adsorbent had a high adsorption capacity up to 18.8 times of its own weight. The bio-based adsorbent could still retain a high adsorption capacity after over ten cycles. The magnetic property facilitated control and recycling of the foam adsorbent by using a magnetic field. Moreover, the bio-based foam adsorbent was fully degraded in a methanol/sodium hydroxide solution (0.5 mol/L) at 60 °C after 8 h. The outstanding mechanical stability, reusability, and environmental friendliness make these bio-based foam adsorbent highly promising for cleaning up pollutions in water.
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COMBUSTION AND FLAME
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2022
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IF 5.767
Ling-Nan Wu,Zhen-Yu Tian,Kai-Ru Jin,Zhi-Hao Zheng,Du Wang,Bing-Zhi Liu,Qiang Xu,Zhan-Dong Wang
Pyridine is an important model compound of fuel-nitrogen during the coal combustion process . The lean oxidation of pyridine was studied over 800–1100 K at atmospheric pressure with the equivalence ratio of 0.4 in a jet-stirred reactor. Pyridine and its oxidation products were measured by tunable synchrotron vacuum ultraviolet photoionization molecular-beam mass spectrometry and gas chromatography analyzer. Three-stage consumption phenomenon of pyridine and O 2 was observed including a fast consumption stage at 910–920 K, a moderate consumption stage at 920–1000 K, and a slow consumption stage at 1000–1100 K. HCN, N 2, N 2 O, and HNCO are the major nitrogenous oxidation products of pyridine. CO, CO 2 , HCN, and HNCO are the dominant carbonaceous products. HNCO is uniquely detected in the lean oxidation of pyridine compared with rich oxidation. A new pyridine LTO 2.0 model comprising 210 species and 1349 reactions was proposed, providing a good prediction of pyridine and its major oxidation products against experimental data. N 2 O emission is larger than NO at 1100 K. HCN is the dominant nitrogenous intermediate under both fuel-lean and fuel-rich conditions. Results of this work provide a detailed analysis of the nitrogen evolution mechanism of pyridine oxidation under the fuel-lean condition, which is close to the real industrial low-temperature coal combustion processes including the MILD combustion, fluidized bed combustion , etc.
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