Insects
·
2025
·Vol. 16
·期 2
·111
·
IF 2.9
Liuyang Wang,Yubo Wang,Xiaofang Zhang,Meijuan Fang,Xiangdong Mei,Tao Zhang
Simple SummaryPlant bugs’ locating of mates mainly relies on peculiar chemical signals known as sex pheromones, which can be utilized to develop environmentally friendly pest control methods. This study investigated the sex pheromones ofPolymerus pekinensis, a phytophagous insect of alfalfa crops in East Asia. By analyzing chemical extracts from both male and female insects, we identified two antenna-active compounds: octyl acetate (OA) and decyl acetate (DA). Females produced higher amounts of OA, while males produced greater quantities of DA. Field experiments demonstrated that lures loaded with solely OA strongly attracted maleP. pekinensis, making it a valuable tool for monitoring this pest. However, the addition of DA in larger amounts significantly decreased the attractivity of lures. Our findings offer new strategies for monitoring and managing these insects in a manner that does not harm non-target insects.Insect sex pheromones have been widely used in integrated pest control due to their efficiency, non-toxicity, specificity, and environmental sustainability. They are considered a key component of green pest management techniques.Polymerus pekinensisis a phytophagous plant bug on alfalfa (Medicago sativaL.) in East Asia. This study used gas chromatography–electroantennogram detection (GC–EAD) and gas chromatography–mass spectrometry (GC–MS) to analyze the whole-body extracts from male and femaleP. pekinensis. Octyl acetate (OA) and decyl acetate (DA) elicited the antennal response of males and were identified as the predominant components of female and male extracts, respectively. Subsequent field trials demonstrated that OA (>8 mg per lure) showed the strongest attraction to conspecific males. However, when DA was added in a lure (≥2 mg), a significant decline in captures occurred. These findings provide new insights into the understanding of sex pheromones in Miridae and benefit the development of sustainable management ofP. pekinensis.
研究领域:
昆虫学
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农业科学
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DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Changshen Ye,Xiaolian Dong,Wenjie Zhu,Dongren Cai,Ting Qiu
Isobaric vapor–liquid equilibrium (VLE) data for three binary systems (PM + PMA, MeAc + PM and MeOH + PMA) at 101.3 kPa were measured in a double circulating still of modified Othmer type. The thermodynamic consistency of the experimental data was checked by Herington method. The experimental data were correlated with NRTL and Wilson models. The binary interaction parameters of both models have been obtained by simplex method. The root mean square deviations (RMSD) for the vapor phase fraction and the boiling temperature are less than 0.01 and 0.5 K, respectively. The results indicate that the calculated values by NRTL and Wilson models are in good agreement with the experimental data and no azeotropic behavior has been found in the three binary systems. The research findings would provide basic data for the design and analysis of distillation process.
研究领域:
化学工程
·
热力学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Wang Jun,Zhu Tianlong,Deng Ziwen,Liu Haicheng,Huang Chunxiang,Li Na,Sun Xueni,Shao Hui,Qi Lv
Isobaric vapour-liquid equilibrium (VLE) data for binary systems containing methyl chloroacetate (MC) + methyl 2-chloropropionate (M2C), MC + methyl dichloroacetate (MDC), and M2C + MDC at 101.33 kPa and the saturated vapour pressure data of these components were measured by using a modified Othmer still. The VLE data showed that these binary systems were all slightly positive deviation solutions compared with the ideal system. Herington area and point tests were used to confirm the thermodynamic consistency for these binary systems, and the results showed good thermodynamic consistency. The interaction energy ( E inter ) between these components was calculated by molecular simulation to explain the normal boiling point and VLE behavior. The simulation results showed weak hydrogen bonds between these chlorinated esters. In addition, the binary VLE experimental data were correlated by the Wilson, NRTL, and UNIQAC models. The correlated results agreed well with the experimental values.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·Vol. 75
·期 3
·330-342
·
IF 0.84
Haishuang Jia,Liu Wenfang,Li Na,Wang Jun,Song Youtao
Abstract Two novel methods for spectrophotometric determination of Cu 2+ ion using synthesized and characterized furfuraldehyde fluorescein diacetate hydrazone ( FFDH ) and furfuraldehyde fluorescein hydrazone ( FFH ) have been proposed. Addition of Cu 2+ to FFDH and FFH solutions results in a rapid color change from colorless to dark yellow. Experimental results show that FFH and FFDH both can provide a rapid, selective and sensitive response to Cu 2+ within a linear dynamic range of 7–33 µM and the detection limits of 1.1 × 10 –7 and 7 × 10 –8 M, respectively. Apparently, the detection limit of FFDH is lower than that of FFH, which indicates that FFDH forms a more stable complex with Cu 2+ . In addition, the detection of Cu 2+ in water samples was also studied; as a result, the developed FFDH was found to be more applicable than FFH for spectrophotometric determination of Cu 2+ in environmental water samples. Particularly, as a lipid chemical compound, FFDH may be transported across the cell membrane to detect Cu 2+ in vivo. It is of great significance in many fields, such as biology, biochemistry, medicine and environment.
研究领域:
分析化学
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环境科学
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生物化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 7
·6451
·
IF 5.6
Yanning Wang,Boyou Hou,Liping Huang,Bingjian Li,Shi Liu,Mingyang He,Qun Chen,Jinchun Li
At present, the development and usage of degradable plastics instead of traditional plastics is an effective way to solve the pollution of marine microplastics. Poly (butylene adipate-co-terephthalate) (PBAT) is known as one of the most promising biodegradable materials. Nevertheless, the degradation rate of PBAT in water environment is slow. In this work, we successfully prepared four kinds of high molecular weight polyester copolyesters (PBATGA) via quaternary copolymerization. The results showed that the intrinsic viscosity of PBATGA copolymers ranged from 0.74 to 1.01 dL/g with a glycolic acid content of 0–40%. PBATGA copolymers had excellent flexibility and thermal stability. The tensile strength was 5~40 MPa, the elongation at break was greater than 460%, especially the elongation at break of PBATGA10 at 1235%, and the thermal decomposition temperature of PBATGA copolyesters was higher than 375 °C. It was found that PBATGA copolyester had a faster hydrolysis rate than PBAT, and the weight loss of PBATGA copolymers showed a tendency of pH = 12 > Lipase ≈ pH = 7 > pH = 2. The quaternary polymerization of PBAT will have the advantage of achieving industrialization, unlike the previous polymerization process. In addition, the polymerization of PBATGA copolyesters not only utilizes the by-products of the coal chemical industry, but also it can be promising in the production of biodegradable packaging to reduce marine plastic pollution.Keywords:methyl glycoacetate;glycolic acid;biodegradable;hydrolysis
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Jinbei Yang,Yichun Huang,Yang Wang,Jinyi Chen,Meiqiong Yu
Isobaric vapor–liquid equilibrium (VLE) data for the four binary systems of n-butyric acid with water, isopropyl acetate, n-propyl acetate, and n-methylpyrrolidone were measured experimentally by a modified Rose still at the local atmospheric pressure of 99.8 kPa. All of the experimental VLE data for the four binary systems passed the Van Ness thermodynamic consistency test. Two activity coefficient models, namely, the NRTL and Wilson models, were selected to correlate the VLE data, and the binary interaction parameters were regressed with the two models. The result indicates that a homogeneous azeotropic behavior can be found for the two binary systems of water + n-butyric acid and n-butyric acid + n-methylpyrrolidone, and the obtained VLE data correlate well with the two models. There is no binary azeotropic behavior between n-butyric acid and isopropyl acetate/n-propyl acetate, indicating that isopropyl acetate and n-propyl acetate can be used as extractants and azeotropic agents for the extraction–azeotropic distillation separation of n-butyric acid and water.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2015
·
IF 2.679
Zhixian Huang,Haiming Jiang,Ling Li,Hongxing Wang,Ting Qiu
The properties of ethyl trifluoroacetate (CF 3 COOCH 2 CH 3 ) were measured as a function of temperature: density (278.08 to 322.50) K, viscosity (293.45 to 334.32) K, saturated vapor pressure (293.35 to 335.65) K. The density data were fitted to a quadratic polynomial equation, and the viscosity data were regressed to the Andrade equation. The correlation coefficient ( R 2 ) of equations for density and viscosity are 0.9997 and 0.9999, respectively. The correlation between saturated vapor pressures and temperatures was achieved with a maximum absolute relative deviation of 0.142%. In addition, the molar evaporation enthalpy in the range of T = (293.35 to 335.65) K was estimated by the Clausius–Clapeyron equation.
研究领域:
化学
·
热力学
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DOI
高影响因子
Journal of Energy Chemistry
·
2015
·
IF 2.352
Wenfei Hu,Yan Zhang,Yizheng Huang,Jiaxi Wang,Jin Gao,Jie Xu
Glycerol can be obtained as a by-product during biodiesel manufacture. It is important to convert glycerol to value-added products. Glycerol esterification with acetic acid is one of the most promising approaches for glycerol utilization. It is usually difficult to obtain diacetin with good activity and selectivity. In this work, glycerol esterification with acetic acid over different metal oxides , such as Bi 2 O 3 , Sb 2 O 3 , SnO 2 , TiO 2 , Nb 2 O 5 and Sb 2 O 5 , was investigated. It was found that in the six investigated metal oxides, only Sb 2 O 5 resulted in good activity and selectivity to diacetin. Under the optimized conditions, the glycerol conversion reached 96.8%, and the selectivity to diacetin reached 54.2%, while the selectivity to monoacetin and triacetin was 33.2% and 12.6%, respectively. The catalysts were characterized with FT-IR spectra of adsorbed pyridine , which indicated that in the six investigated metal oxides, only Sb 2 O 5 possessed Brønsted acid sites strong enough to protonate adsorbed pyridine. The good catalytic activity and selectivity to diacetin might be mainly attributable to the Brønsted acid sites of Sb 2 O 5 . Reusability tests showed that with Sb 2 O 5 as catalyst, after six reaction cycles, no significant change in the glycerol conversion and the selectivity to diacetin was observed.
研究领域:
化学工程
·
催化剂科学
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DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2018
·
IF 2.616
Feng Cheng,Feifei Cheng,Jianyong Zheng,Guanzhong Wu,Yinjun Zhang,Zhao Wang
Only a few esterases have been used for the synthesis of optically pure fungicide. For example, ( R )-metalaxyl synthesized using esterase-involved bioreaction displays fungicide activity, whereas ( S )-enantiomer is redundant. However, the biosynthesis of ( R )-metalaxyl is currently hampered by the lower activity, selectivity and thermostability of esterase. Therefore, to obtain a better biocatalyst, several esterase genes were cloned from Pseudochrobactrum asaccharolyticum WZZ003. The esterase PAE07, among eight enzymes, was selected because it exhibited the highest hydrolysis activity toward ( R , S )-DMPM. The DNA and amino acid sequence analysis suggested that PAE07 is a new member of lipolytic enzyme family V. The enzymatic properties of PAE07 toward ( R , S )-DMPM and model substrate ( p- nitrophenyl acetate) were investigated. PAE07 was found to be a highly active esterase with excellent enantioselectivity . The reaction conditions including temperatureand pH were optimized, and the effects of metal ions, organic solvents and detergents were also investigated. Results indicated that PAE07 is a competitive candidate for ( R )-metalaxyl manufacturing.
研究领域:
生物化学
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酶工程
·
农药合成
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Caiyun Liu,Fujing Zheng,Huiying Li,Mario Prejanò,Guojie Jin,Yongsheng Tao,Yunkui Li
This study investigated molecular interactions between benzoic acids (gallic acid/protocatechuic acid) and acetate esters using thermodynamics and quantum mechanics, as well as the effects of benzoic acids on acetate esters release and perception in simplified and real wine systems, respectively. Results showed spontaneous binding (ΔG < 0) between benzoic acids and acetate esters (ethyl octanoate > ethyl hexanoate > isoamyl acetate > ethyl butyrate > ethyl acetate), with gallic acid exhibiting stronger affinities. The OH of benzoic acids and COO of acetate esters were the key groups, driven synergistically by hydrogen bonding, dispersion interactions, and hydrophobic effects, while electrostatic contributions dominated interaction energies (43–60 %). Benzoic acids significantly reduced acetate esters release, showing structure- and concentration-dependent trends. Aroma profile and perception revealed benzoic acids promoted formation and retention of fermentation aroma, enhancing flavor and fruitiness. These findings provided mechanistic insights for modulating wine aroma through benzoic acid- acetate ester interactions.
研究领域:
食品科学
·
化学
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xing-An Luo,Pei Zhao,Hai Zhang,Shu-Yi Feng,Ke-Xian Chen,Zhong-Xiu Chen
Dietary macromolecules are often used for food formulation. Most of the published literature usually focuses on a certain polysaccharide reducing lipid digestion, but the non-specific physical effects such as the excluded volume effect of the surrounding macromolecules, which will possibly enhance the hydrolysis of lipids, is rarely discussed. As the influence of polysaccharides on the gastrointestinal fate of α-tocopherol acetate (VE-A) encapsulated in emulsion have not been conducted so far, in this research, we study the effect of crowded medium created by polysaccharides (Ficoll400) on the hydrolysis of VE-A and its bioaccessibility. The results show that the presence of Ficoll400 increased the bioaccessibility and conversion of VE-A 1.6 times that of a dilute buffer. An enzyme-catalyzed kinetic reaction rate of VE-A hydrolysis is increased up to 3.5 times. Both the improved thermodynamic conversion yields and kinetic rates of the hydrolysis of the VE-A emulsion was further observed in a synthetic macromolecule PEG2000 medium. This research improves our understanding of the crowding effect of macromolecules on VE-A/lipid emulsion digestion.
研究领域:
食品科学
·
营养学
·
生物化学
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Qiang Lu,Yuefang Chen,Weipeng Song,Chaonan Tao,Junhua Zhang,Yong Sun,Lincai Peng,Huai Liu
Direct utilization of cellulosic material to produce specialty chemicals such as levulinate ester could greatly increase biorefinery profitability, but low-level efficiency due to its structural nature limits the strategy for industrial deployment. We report herein that adding γ-valerolactone (GVL) co-solvent during the acid-catalyzed conversion of cellulose in ethanol leads to a high reaction rate and improved catalytic activity towards ethyl levulinate (EL) production. With GVL as the co-solvent (the volume ratio of GVL to ethanol in 1:4), the yield of EL highly enhanced from 31% to 56% under mild operating conditions (170 °C for 2 h) over a low loading Al(OTf) 3 of 0.005 mol/L. The mechanistic role of GVL co-solvent to accelerate EL formation from cellulose has been fully elucidated via the combination of experimental and theoretical approaches. It demonstrates that GVL intervention not only favored the dissolution and depolymerization of cellulose, but also enabled the formation of Al species with higher acidity and catalytic activity by modulating the solvation environment, both of which are in charge of promoting cellulose conversion to EL. The activation energy barriers for cellulose depolymerization and glucoside alcoholysis have decreased by 30.8 kJ/mol and 24.8 kJ/mol, respectively. The understanding of this solvation effect can be employed to optimize the rate and yield for production of the versatile bio-based ester compound straight from cellulose valorization.
研究领域:
化学工程
·
可再生资源与环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）