COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Hongfei Wang,Chao Li,Tie Geng,Na Du,Wanguo Hou
Layered double hydroxides (LDHs) are one type of potential emulsifiers for Pickering emulsions. Surface modification can regulate their surface properties, thereby affecting their emulsifying behavior. However, there is still a lack of full understanding of the impact of surface modification on their surface properties. In the current work, one Mg 3 Al-Cl LDH was modified using oleic acid (OA), obtaining six OA-modified products with different OA loadings. Their contact angles and relative dielectric constants were determined, and their surface properties including the interfacial free energies ( γ ) and solubility parameters ( δ ) were then estimated from the data. Their apparent molar volumes were estimated using the γ and δ data. OA molecules are coated on the LDH surface via the bidentate bonding mode to form monolayers. The OA modification has no obvious impact on the structure and morphology of LDH particles, but can significantly affect their surface properties. This work provides a better understanding of the dependence of surface properties of LDHs on the surface modification.
研究领域:
材料科学
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界面化学
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产品关联
DOI
高影响因子
Journal of Fungi
·
2024
·Vol. 10
·期 8
·521
·
IF 4.2
Guang Wang,Xu Zhang,Guangzu Du,Wenqian Wang,Yunhao Yao,Sitong Jin,Haosheng Cai,Yuejin Peng,Bin Chen
Metarhizium rileyiis a wide spread insect fungi with a good biocontrol potentiality to various pests, particularly noctuid insects. However, it is characterized by its slow growth, its sensitivity to abiotic stress, and the slow speed of kill to pests, which hinder its use compared with other entomopathogenic fungi. In this study, the responses ofM. rileyito eight types of lipids were observed; among the lipids, oleic acid and linoleic acid significantly promoted the growth and development ofM. rileyiand enhanced its stress tolerances and virulence. An additional mechanistic study demonstrated that exogenous oleic acid and linoleic acid significantly improved the conidial germination, appressorium formation, cuticle degradation, and cuticle infection, which appear to be largely dependent on the up-regulation of gene expression in growth, development, protective, and cuticle-degrading enzymes. In conclusion, exogenous oleic acid and linoleic acid enhanced the stress tolerances and virulence ofM. rileyivia protecting conidial germination and promoting cuticle infection. These results provide new insights for the biopesticide development ofM. rileyi.
研究领域:
昆虫学
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微生物学
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生物技术
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害虫管理
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Cuiping Zhu,Mingmei Jing,Zhenjie Guo,Xiaojin Shi,Yang Hu,Zhuohong Yang,Zhuangzhuang Chu
Based on the amino-functionalized corn straw cellulose-based porous material, a structurally stable and high-performance straw-based metal catalyst (PPCS@Ni) was prepared by depositing metal particles on the surface of porous straw (PCS) using an economical and environmentally friendly polymer-assisted metal deposition (PAMD) method. Due to the excellent structural stability of the metal material and the catalytic performance of nickel, PPCS@Ni exhibited outstanding catalytic efficiency, cyclic regeneration ability, and stability in the catalytic hydrogenation of oleic acid. Furthermore, after experimental screening and optimization (8 g oleic acid, 34.73 % Ni, 100 mg PPCS@Ni, 180 °C, 3 MPa H 2 , 6 h), PPCS@Ni demonstrated a yield and selectivity for stearic acid reaching 100 %. Finally, density functional theory calculations revealed the mechanism of PPCS@Ni in the hydrogenation reaction of oleic acid as well as elucidated the key role of the catalyst surface and selectivity trend of products. With these advantages, it is anticipated that the straw-based metal catalysts developed in this study will provide a new effective pathway for vegetable oil hydrogenation processes.
研究领域:
催化材料
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化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Miao Liu,Xu-long Cao,Yang-wen Zhu,Ying Tong,Lei Zhang,Lu Zhang,Sui Zhao
The dynamic interfacial tensions (IFTs) of three different types of surfactant solutions, cationic surfactant hexadecyl trimethylammonium (CTAB), anionic surfactant sodium dodecyl benzenesulfonate (SDBS), and non-ionic surfactant Triton X-100 (TX-100), against model oil containing oleic acid (OA) have been investigated by a spinning drop interfacial tensiometer. The influences of the OA concentration and addition of alkali have been studied. The experimental results show that OA added to the oil phase has a significant effect on interfacial behaviors of surfactant solutions. An obvious synergistic effect on reducing IFT can be observed for low-concentration cationic surfactant CTAB solution because the tight mixed adsorption films will be formed through electrostatic attraction between CTAB and OA molecules. However, the synergistic effect will disappear at a high surfactant concentration by the formation of mixed micelles. For the anionic surfactant SDBS system, the mixed adsorption of SDBS and OA molecules leads to a limited decrease of equilibrium IFT as a result of electrostatic repulsion. The hydrophilic group EO chain of TX-100 extends into the aqueous phase and the interfacial film becomes tight with an increasing bulk concentration. As a result, OA shows little effect on the equilibrium IFTs at a high TX-100 concentration. The alkali in the aqueous phase will react with OA in the oil and produce anionic surfactant sodium oleate (SO), which destroys the synergistic effect between CTAB and OA molecules. With an increase of the OA concentration, the dynamic characteristic of IFT has been enhanced and the transient IFTs decrease obviously because more SO molecules have been produced.
研究领域:
化学
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界面科学
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 297
·期 1
·125-132
·
IF 1.967
Li Chaowang,Xie Danhua,Pei Xiaomei,Song Binglei,Cui Zhenggang
Traditional tetrameric surfactants exhibit a variety of self-assembled aggregation behaviors and excellent rheological properties. In recent years, the use of non-covalent interactions to construct pseudo-oligomeric surfactants has attracted extensive attention. We constructed dynamic oleic acid-based pseudo-tetrameric surfactants through electrostatic interaction between tetrameric quaternary ammonium salts (3- n -3, n = 2, 3, 6, 8) and the environmentally friendly sodium oleate. The series of surfactants showed higher viscoelasticity with increasing concentration, which is similar to the traditional tetrameric surfactants. With the addition of the tetrameric salts, the zero-shear viscosity of the original sodium oleate solutions increased by a factor of more than 80,000. The rheological properties can be flexibly modulated by controlling the middle spacer length of the tetrameric quaternary ammonium salt. The wormlike micelles of dynamic oleic acid-based pseudo-tetrameric surfactants will expand the potential applications of ionic liquids in home care products, oil field stimulation fluids, and nanobiotechnology.
研究领域:
材料科学
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化学工程
·
表面科学
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产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2023
·Vol. 103
·期 7
·3489-3500
·
IF 4.1
Yihang Liu,Qingzhi Wang,Chen Liu,Haonan Yang,Li Jia,Litao Zhao,Fayong Gong,Chen Tan,Hongxun Tao,Wen-Sen He
BACKGROUND Oxidation is a major problem for oils and fats, which can be mitigated by antioxidants. Rutin has excellent antioxidant activity, but its poor lipid solubility greatly limits its practical application. In this study, an efficient enzymatic synthesis route of lipophilic rutin ester was established using oleic acid as an acyl donor, and the antioxidant potential of rutin oleate was evaluated for the first time by proton ( 1 H) nuclear magnetic resonance (NMR) spectroscopy. RESULTS The synthesized product was finally identified as rutin oleate by Fourier transform infrared, high-performance liquid chromatography–mass spectrometry, and 1 H, carbon-13, and DEPT-135 NMR analyses, and the acylation site was the 4‴-OH of the rhamnose group in the rutin molecule. The maximum conversion was over 93% after 48 h of reaction using Novozym 435 as catalyst under the best conditions among these tests. The conversion of rutin ester decreased with the increase of carbon chain length and the number of carbon–carbon double bonds of the fatty acid molecule. Most importantly, rutin oleate exhibited antioxidant capacity comparable to butylated hydroxytoluene and its counterparts (rutin and oleic acid) at low temperatures (60° C), but had a significant advantage at high temperatures (120° C). CONCLUSION The antioxidant activity of rutin was significantly enhanced by lipase-mediated esterification with oleic acid. Therefore, rutin oleate could be further developed as a novel antioxidant for use in oil‑ and fat-based foods. © 2023 Society of Chemical Industry.
研究领域:
食品科学
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生物化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2014
·
IF 3.406
Zhenhua Gao,Shaokun Tang,Xili Cui,Songjiang Tian,Minhua Zhang
Ordered mesoporous carbons (OMCs) with hexagonal structure and hydrophobic surface were synthesized via cooperative self-assembly of phenolic resol and surfactant F127 in ethanol, followed by sulfonation with 4-aminobenzenesulfonic acid and isoamyl nitrite. The sulfonated OMCs (S-OMCs) were used as the catalyst for the esterification of oleic acid and methanol to simulate the deacidification of oil materials with high acid values in biodiesel production. The influences of sulfonation conditions including temperature, mass ratio of the reactants and calcination temperature of OMCs on the conversion of oleic acid in the esterification reaction were investigated and the selectivity of this esterification was studied for the first time. It shows that the mesoporous carbon-based solid catalyst exhibits high activity and reusability. The conversion of oleic acid can reach up to 96.25% and the catalyst can be reused for at least nine times without remarkable loss of catalytic activity.
研究领域:
化学工程
·
催化材料
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 2
·51476
·
IF 3.125
Yu Zeng,Neng Zhou,Chenhan Xiong,Zhiyong Huang,Guoping Du,Zhaoyang Fan,Nan Chen
Silicone rubber composites have attracted wide attention due to their excellent thermal stability and climate resistance. However, it is still a challenge to synthesize these composites with high tensile property without external stimulation. Meanwhile, incorporation of superparamagnetic iron oxide nanoparticles to fabricate magnetic nanocomposites have a broad application prospect. In the present work, aiming to improve the mechanical and magnetic properties of the silicone rubber composite, fumed silica and different content of oleic acid-modified Fe 3 O 4 nanoparticles are well dispersed in the silicone rubber matrix. The synthesized nanocomposites exhibit excellent thermal stability, superelasticity, superparamagnetic property, and sensitive magnetic response. In particular, a high elongation at break of 1931%, a low storage modulus of 0.56 MPa and a deflection of 27 mm under an applied magnetic field of 1.31 Oe are obtained in the silicone rubber nanocomposite. The present work provides a feasible way to prepare silicone rubber matrix nanocomposites with excellent mechanical and magnetic performance.
研究领域:
材料科学
·
纳米技术
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Wang Ke,Shi Xiang,Yuan Hong
The utilization of biomass as a feedstock for aviation kerosene production serves to alleviate demand pressure on petroleum resources. In this work, commercial hydroxyapatite (HAP) was used as a support to fabricate a series of mono- and bimetallic Pt-Ni catalysts via impregnation. These catalysts were then evaluated for the decarboxylation of oleic acid under a non-hydrogen atmosphere. The XRD and TEM analyses revealed that the Pt metal particles were highly dispersed, whereas the Ni particles exhibited a tendency toward aggregation with increasing loading. Furthermore, Pt-Ni bimetallic particles exhibited aggregation with elevated Ni content. Combined NH 3 -TPD and Py-IR characterization indicated that the 1.5Pt2Ni/HAP bimetallic catalyst possessed appropriate acidity(5.18 cm 3 /g STP) and abundant Lewis acid sites, as evidenced by a Brønsted-to-Lewis ratio of 0.32. Catalytic results demonstrated that under CO 2 atmosphere at 340 °C and 18 bar for 6 h, the 1.5Pt2Ni/HAP catalyst achieved complete conversion of oleic acid and the yield of C 8 -C 17 alkanes reached as high as 85.0%.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Kexin Chang,Ruixia Duan,Suqin He,Hao Liu,Miao Ming Huang,Xu Wanlin,Chengshen Zhu,Zhe Chu,Tao Li,Wentao Liu
Polyvinyl Chloride (PVC) is widely utilized across various industries due to its outstanding comprehensive properties. However, the current reliance on harmful petroleum-based plasticizers, such as phthalates (PAEs), in PVC film processing poses significant environmental and health concerns, limiting its applications. To address this issue, we developed epoxidized isosorbide oleate (EIOA), a non-toxic, bio-based plasticizer with excellent plasticizing performance, as a sustainable alternative to conventional petroleum-derived plasticizers. EIOA was synthesized via esterification and epoxidation reactions using bio-derived raw materials, including isosorbide and oleic acid. When compared to the commercially available plasticizer di(2-ethylhexyl) terephthalate (DOTP), EIOA-plasticized PVC demonstrated superior performance, including: non-toxicity, high optical clarity (87% light transmittance), enhanced thermal stability (T50% was 70 °C higher than pure PVC), exceptional flexibility (~636.5% elongation at break), superior migration resistance (only 1.8% migration in n-hexane and 0.4% in ligroin), and improved compatibility with PVC. Therefore, EIOA-plasticized PVC is highly suitable for medical devices, food packaging, and other applications requiring direct human contact, eliminating safety concerns associated with traditional plasticizers.
✓ 已验证
产品关联
DOI
高影响因子
DNA AND CELL BIOLOGY
·
2022
·Vol. 41
·期 12
·1038-1052
·
IF 3.55
Qianyu Tang,Wenhui Liu,Xuefeng Yang,Yaying Tian,Jiacheng Chen,Yang Hu,Nian Fu
Despite activated autophagy ameliorating hepatocyte steatosis and metabolic associated fatty liver disease (MAFLD), mechanisms underlying the beneficial roles of autophagy in hepatic deregulation of lipid metabolism remain undefined. We explored whether autophagy can ameliorate oleic acid (OA)-induced hepatic steatosis by suppressing pyroptosis. Pyroptosis is involved in hepatocyte steatosis induced by OA. In addition, autophagy flux was blocked in OA-treated hepatocytes. Treatment with OA induced lipid accumulation in liver cell line L-02, which was attenuated by rapamycin (Rap), an autophagy agonist, while aggravated by autophagy inhibitor bafilomycin A1 (Baf A1). Inversely, treatment with pyroptotic agonist Nigericin aggravated OA-induced hepatic steatosis, while pyroptosis antagonist disulfiram ameliorated this effect. Mechanistically, treatment with Rap downregulated the expression of pyroptosis-related proteins, including NLRP3, Caspase-1, IL-18, GSDMD expression evoked by OA, thus improving pyroptosis in hepatic steatosis. Significantly, overexpression of ATG5 obviously downregulated cleaved caspase-1 expressions without altering the total caspase1 expressions in hepatic cell steatosis. Taken together, our studies strongly demonstrated that the activation of ATG5 inhibits pyroptosis to improve hepatic steatosis and suggest autophagy activation as a potential therapeutic strategy for pyroptosis-mediated MAFLD.
研究领域:
肝脏病学
·
细胞生物学
·
分子生物学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
Heliyon
·
2018
·
IF 0
Ningning Cheng,Jingjing Zhang,Jingmei Yin,Shenmin Li
The harm of trans-fatty acids to health has aroused public concern. It is believed that the main source of trans-fatty acids in diets is the isomerization of unsaturated fatty acids in edible oils during cooking. However, the information on the isomerization mechanism is very limited. In this paper, we used oleic acid, an unsaturated fatty acid, as a simplified model for edible oil and investigated the mechanism of cis/trans isomerization by computation and experiments. The computational results show that R c -O-O-H is a very important intermediate, and the cleavage of O-O bond in R c -O-O-H is the rate-controlling step during the cis/trans isomerization. Using the ATR-FTIR measurements, the contents of elaidic acid were measured quantitatively in sites. The experimental results indicate that the cis/trans isomerization of oleic acid can occur obviously only under oxidizing condition when the temperature is higher than 120 °C.
研究领域:
食品化学
·
计算化学
·
物理有机化学
·
营养科学
✓ 已验证
DOI
PubMed
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