Food Chemistry-X
·
2025
·
IF 8.2
Shi-Yi Wang,Chen Li,Yu-Jie Li,Guang-Qian Liu,Zhen-Ming Lu,Li-Juan Chai,Hong-Yu Xu,Jin-Song Shi,Song-Tao Wang,Cai-Hong Shen,Xiao-Juan Zhang,Zheng-Hong Xu
Soy sauce aroma type Baijiu (SSAB) is a complex blend of seven rounds of raw SSAB, each with distinct aroma profiles that evolve during maturation. Tracking the aging of individual rounds is crucial for understanding flavor development. The round 1–4 SSABs were analyzed by gas chromatography–mass spectrometry and an electronic tongue over one-year aging. Results showed that short/medium-chain esters decrease while long-chain esters, acids, aldehydes, pyrazines, ketones, and furans increase. Kinetic analysis showed that short/medium-chain ethyl esters reach equilibrium in the esterification-hydrolysis reactions, whereas long-chain ethyl esters favor esterification, with their reaction quotient (Qc) diverging from the equilibrium point. Linoleic acid ethyl ester, identified as a key aging marker, was found to reduce the volatilization rate of critical aroma compounds in the finished glass, thereby prolonged the duration of lingering aromas. These findings provide a foundation for improving SSAB blending and storage, highlighting aging's key role in enhancing Baijiu quality.
研究领域:
食品科学
·
发酵工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2024
·Vol. 24
·期 7
·2713-2723
·
IF 2.8
Hua Li,Dang Fanglin,Yu Lumengfei,Zhao Hui,Wei Ting,An Fengqiu
Purpose This study aimed to investigate the residual levels of representative organophosphorus and pyrethroid pesticides (chlorpyrifos, cypermethrin, deltamethrin, and lambda-cyhalothrin) in agricultural soils and crops in Shaanxi Province, and to reveal their accumulation characteristics and regional distribution characteristics in crops. Materials and methods The study was conducted using 115 soils and crops samples from typical agricultural areas in Shaanxi Province. The pesticide residues were measured using gas chromatography-mass spectrometry (GC-MS). The crops were analyzed based on the residue characteristics of fruits, vegetables, and field crops. Additionally, the pesticide residues in crops from the Guanzhong area (central part of Shaanxi), northern Shaanxi, and southern Shaanxi regions were analyzed. A correlation analysis was conducted to examine the influencing factors of pesticide residues in soil-crops, considering the physical and chemical properties of the soil in Shaanxi Province. Results and discussion The results indicate that there are differences in the detection rates and residual concentrations of different pesticides in soil. In the Guanzhong area, the pesticide residual levels in crops follow the trend of chlorpyrifos > deltamethrin > lambda-cyhalothrin > cypermethrin, with relatively high pesticide residues found in corn. In northern Shaanxi, the overall pesticide residual levels in crops show a trend of chlorpyrifos > deltamethrin > cypermethrin > lambda-cyhalothrin. In southern Shaanxi, all the pesticides were detected to varying degrees in crops, with chlorpyrifos showing the highest residual levels. Conclusions All four pesticides were detected in the soils of the study area and the enrichment capacity of different crops varied greatly. Pesticide enrichment is not only affected by temperature and climate conditions in different regions, but soil organic matter, pH, and CEC also have a significant effect on the enrichment of pesticides by crops.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Yao Yan,Zuanxin Yang,Songming Chen,Rong Yang
The flame-retardant modification of polymers, while preserving or enhancing their mechanical properties, is critical for engineering plastics. In this study, we develop flame-retardant polycarbonate (PC) composites with improved mechanical performance by incorporating cinnamate-containing liquid crystalline copolyester (CLCP). During the injection molding process, CLCP forms oriented microfibrils in situ, boosting the tensile strength of the composites by up to 66 %. The cinnamate groups in CLCP undergo radical-initiated thermal crosslinking, which increases melt viscosity, prevents dripping, and achieves a UL-94 V-0 rating. The primary flame retardancy mechanism occurs in the condensed phase: early decomposition of CLCP triggers thermal crosslinking, leading to the formation of a dense, graphitized char layer that reduces the peak heat release rate (PHRR) by 46.8 %, total smoke production by 17.9 %, and increases the limiting oxygen index (LOI) to 32.5 % (compared to 27.0 % for neat PC). This dual-functionality of CLCP addresses both the flammability and mechanical limitations of PC, making it a promising candidate for engineering applications requiring high-performance materials. This work introduces a novel molecular design strategy, integrating liquid crystallinity and cinnamate crosslinking, to enhance both flame resistance and mechanical properties in engineering plastics.
研究领域:
材料科学
·
高分子工程
·
消防安全工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52694
·
IF 3.057
Liang Chen,Zhuding Dai,Wenxue Lou,Pingping Jiang,Pingbo Zhang,Yanmin Bao,Xuewen Gao,Jialiang Xia
In order to endow water-based polyurethane with special functionality, vegetable oil-based waterborne polyurethane with self-healing properties is synthesized. Firstly, soybean oil-based emulsifier (GA-ESO) was prepared by epoxy soybean oil and glutaric acid without solvent and catalyst. Then, two Diels−Alder (DA) diols were prepared by the DA reaction between N , N ′-(4,4′-methyldiphenyl) bismaleimide, 4-maleimide phenol and furfuryl alcohol, respectively. Finally, GA-ESO and DA diols used as the raw material was reacted with isophorone diisocyanate to synthesize a series of soybean oil-based waterborne polyurethane with self-healing behavior. The effects of DA diol on the properties of polyurethane films and the self-healing process and mechanism of polyurethane membrane were investigated. The results showed that after the addition of DA diol, the particle size of polyurethane emulsion increased from 28.8 to 85.3 nm, the tensile strength was improved from 0.3 to 12.6 MPa, and the water contact angle was enhanced from 68.5° to 84.2°. In addition, it can be observed that with the addition of DAdiol, the polyurethane film had self-healing behavior at high temperature, and the highest self-healing efficiency can reach 100%.
研究领域:
材料科学
·
高分子化学
·
化工
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xinmiao Wang,Qian Wang,Dong Cai,Jinghan Yu,Xuan Chen,Xu Guo,Peiyong Tong,Xiaoyang Liu,Fawen Yin,Dayong Zhou
HPLC-UV analysis was used to evaluate the enzymatic degradation characteristics of tyrosol acyl esters (TYr-Es) and alkyl gallates (A-GAs). Among various hydrolytic enzymes, TYr-Es can be hydrolyzed by pancrelipase, while A-GAs cannot be hydrolyzed by pancrelipase. Interestingly, carboxylesterase-1b (CES-1b), carboxylesterase-1c (CES-1c) and carboxylesterase-2 (CES-2) are able to hydrolyze TYr-Es and A-GAs, and thus to liberate tyrosol (TYr) and gallic acid (GA). By contrast, the degrees of hydrolysis (DHs) of TYr-Es and A-GAs by CES-1b and CES-1c were significantly higher than those by CES-2. Meanwhile, the DHs of TYr-Es were much higher than those of A-GAs. Especially, the DHs firstly increased and then decreased with the increasing alkyl chain length. Besides, DHs positively correlated with the unsaturation degree at the same chain length. Through regulating carbon length, unsaturation degree and the ester bond structure, controlled-release of phenolic compounds and fatty acids (or fatty alcohols) from phenolic esters will be easily achieved.
研究领域:
生物化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Chao Zeng,JiaWei Ren,WuFeng Shen,ShengMing Zhang,Peng Ji,ChaoSheng Wang,HuaPing Wang
Developing green and sustainable polymers is one of the effective ways to limit carbon emissions and reduce dependence on petroleum resources. Therefore, polyester-polycarbonates based on carbon dioxide (CO2) have attracted extensive attention. However, polyester-polycarbonates with fully rigid structures are difficult to prepare by traditional transesterification methods, which result in low glass transition temperatures and insufficient mechanical properties. Here, a series of polyester-polycarbonates (PCCITs) with a fully rigid structure were prepared by end hydroxyl shielding using dimethyl carbonate derived from CO2 and biologically sourced isosorbide (IS), and the IS content is 0–60 mol %. The ester bond structure of polyester-polycarbonate was analyzed by two-dimensional correlation spectroscopy (2DCOS). Due to the V-shaped fused ring structure of IS, the heat resistance of the copolyester is significantly improved. The glass transition temperature of PCCITs ranges from 64.2 to 131.1 °C, and its heat distortion temperature can reach up to 120.1 °C. Furthermore, all copolyesters are entirely amorphous and exhibit good transparency (>88%) and low haze value (<4%). Notably, the mechanical properties of PCCITs are comparable to those of commercial heat-resistant polyethylene terephthalate glycol (PETG), with the tensile strength of PCCT to PCCIT60 increasing from 43.5 to 57.8 MPa, elongation at break ranging from 206.0 to 4.5%, and impact strength up to 820.3 J m–1. Life cycle assessment evaluation showed that the GWP value of PCCIT was significantly reduced, up to 41.5%, compared with commercial PETG. This work constructs sustainable IS-based polyester-polycarbonate with fully rigid through the terminal hydroxyl shielding method.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Hao Liu,Lu Wang,Xiaoxue Zhang,Junbo Zang,Song Xu,Chunhong Zhang,Yuhui Ao,Weifeng Du,Lei Shang
The preparation of environmentally friendly and efficient waterborne polyurethane sizing agents for carbon fiber (CF) is difficult, especially to avoid the use of isocyanates. Herein, ellagic acid and CO 2 were used to prepare a five-membered cyclic carbonate compound (EARBO). The polymerization between EARBO and diamines enabled the preparation of highly efficient and green aqueous non-isocyanate polyurethane (WNIPU) sizing agents. WNIPU sizing agent exhibits excellent heat resistance (T 5% :244.5 °C). The hydroxyl group and tertiary amine effectively enhance the polarity and wettability of CF (CF surface energy is as high as 55.42 mJ/m 2 ) and show excellent compatibility with epoxy resin. Carbon fiber/epoxy composites treated with this sizing agent showed exceptional interfacial properties, achieving interfacial shear strength, ply shear strength, flexural strength, and tensile strength of 116.84 MPa, 71.58 MPa, 1352.79 MPa, and 1719.27 MPa, respectively—representing 112.05 %, 42.05 %, 86.68 %, and 87.11 % improvements over traditional composites. The WNIPU sizing agent’s efficiency and environmental advantages indicate it as a promising alternative to commercial polyurethanes.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Jun Du,Qiankun Chang,Cui Xu,Bin Liu,Yamin Deng,Xiao Jia,Xiulan Huai
New requirements for thermal interface materials to combine both mechanical properties and heat dissipation have been proposed by long cruising range and lightweight cell-to-pack (CTP) battery system. Here we report an environment-friendly thermally conductive composite based on polyurethane (PU) as the matrix and alumina (Al 2 O 3 ) as the thermally conductive filler, which presented all of the thermally conductive, notable mechanical strength and toughness, and electrical insulation with a thermal conductivity of 0.84 W/(m·K), a tensile strength of 8.09 MPa, an elongation at break of 117.51 %, and a volume resistivity of 4.3 × 10 14 Ω·cm. Aluminum alloy 5052 adherends were used to manufacture the single-lap joints (SLJs) of composites with different isocyanate indices, and the single-lap shear test was used to investigate the tensile lap-shear strengths and failure modes of the joints. A critical discussion was conducted regarding the relationship between the isocyanate index (R index) and the bonding mechanism. It was found that changing the isocyanate index under the premise of fixed hard segment content enhanced the lap-shear strength of joints from 4.49 MPa to 8.24 MPa. Meanwhile, the failure mode transitioned from the adhesive failure mode to the adhesive/cohesive mixed failure mode, and then to the cohesive failure mode. Hence, the present study sheds light on the rational design of thermally conductive composites to promote the multi-functionality of thermal management applications in the new energy vehicle battery domains.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Sifan Chen,Tingting Zhao,Peiyuan Li,Shuanjin Wang,Dongmei Han,Sheng Huang,Wei Liu,Zhiheng Huang,Min Xiao,Yuezhong Meng
A completely new poly(carbonate-ester) macrodiol (PPCP-mDL), derived from direct copolymerization of carbon dioxide (CO 2 ), propylene oxide (PO), phthalic anhydride (PA) and 1, 4-butanediol (BDO) catalyzed by metal-free triethylborine (TEB)/1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) pairs has been developed. The molecular weight of PPCP-mDL produced varying from 1.1–2.3 kg mol −1 can be easily controlled through the regulation of reaction conditions. For the formulation of non-toxic, phthalate-free flexible PVC, novel and biodegradable ec-PPCP-mDL with high molecular weight may be obtained through end-capping the PPCP-mDL using benzoyl chloride. The ec-PPCP-mDL/PVC blends display better comprehensive plasticization performance than do comparable blends with commercial DEHP plasticizers. These blends exhibit high thermal stability, mechanical properies, plasticizer migration resistance and transmittance. The interaction between ec-PPCP-mDL and PVC has been characterized using FTIR spectroscopy. A possible mode of plasticization has been suggested. The rich ester groups in the structure of ec-PPCP-mDLs interact well with PVC via hydrogen bonding, resulting in excellent compatiblity with PVC. Overall, the novel ec-PPCP-mDL material, respects an attractive alternative to plasticizers as a green, non-toxic, biodegradable, partially sustainable for the preparation of flexible PVC formulations.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2025
·
IF 3.4
Mao Haiyan,Guo Yang,Han Qin,He Xuemei,Zheng Chenghui
Non-isocyanate polyurethanes have rapidly risen as an environmentally friendly substitute to traditional isocyanate-based polyurethanes. Here, a crosslinked non-isocyanate polyurethane (CNIPU) was prepared with cyclic carbonate, polyamine, and diglycidyl ether via simple ring-opening and transcarbamoylation methods. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy confirm the successful preparation of CNIPU. When the CNIPU is used as the pigment-dyeing binder for cotton fabric, the thermochromic microcapsules can be fixed on the fiber surface. The dyed fabric shows excellent thermochromic property and its color fastness can reach above 4 grade. This work offers an efficient strategy to utilize non-isocyanate polyurethane to fabricate pigment-dyed fabrics with green and sustainable route. Graphical abstract
Synthesis of a crosslinked non-isocyanate polyurethane binder and its application in pigment dyeing.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hui Wang,Guo Zhao,Dongfei Chen,Zhiqiang Wang,Gang Liu
Biosensor based on enzyme inhibition for the determination of organophosphate pesticides residue was developed and fabricated, which explored to modify screen-printed electrode (SPE) with acetylcholinesterase (AChE) and a composite membrane of magnetic nanoparticle (Fe 3 O 4 ) and graphene (GR). Due to the large specific surface area and high electron transfer of graphene and the strong absorbability and affinity of Fe 3 O 4 for the phosphoric group, the nanocomposite film provided much active site and suitable microenvironment to improve the combination with AChE and maintain the enzymatic activity. The AChE/Fe 3 O 4 /GR/SPE was characterized by different methods including cyclic voltammetry and differential pulse voltammetry, indicating the biosensor had some excellent properties, such as high sensitivity, reproducibility and repeatability. Under optimum conditions, the inhibition rates of AChE were proportional to the concentrations of chlorpyrifos in the range from 0.05 μg/L to 100 μg/L with the coefficients of 0.981 and the detection limits were found to be 0.02 μg/L (S/N=3). This proposed biosensor exhibited high accuracy, reproducibility and regeneration, which was suitable for trace detection of chlorpyrifos residue in vegetable.
研究领域:
生物传感技术
·
农药残留检测
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Jian He,Hu Li,Ye-Min Lu,Yan-Xiu Liu,Zhi-Bing Wu,De-Yu Hu,Song Yang
A series of Al–Zr mixed oxides with different molar ratios were prepared by co-precipitation method and utilized to catalyze conversion of ethyl levulinate (EL) to γ -valerolactone (GVL). Those as-prepared catalysts were characterized by XRD, SEM, N 2 adsorption–desorption, XPS, TG, NH 3 -TPD, CO 2 -TPD and pyridine-IR. The introduction of Al into ZrO 2 was demonstrated to enlarge surface areas, as well as increase the number of acid and base sites that were catalytically active for transfer hydrogenation. Effects of Al–Zr molar ratio, calcination temperature, reaction temperature and time, catalyst dosage, and alcohols used as hydrogen donors on the catalytic performance were investigated. A high GVL yield of 83.2% at EL conversion of 95.5% could be achieved at 220 °C in 4 h over Al 7 Zr 3 -300 using 2-propanol as hydrogen donor and solvent. Poisoning experiments verified that acid–base sites played a synergic role in producing GVL from EL. Moreover, the Al–Zr mixed oxide catalyst was able to be reused for several times with a slight loss in its catalytic activity.
研究领域:
催化化学
·
可再生化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）