Acta Crystallographica Section C-Structural Chemistry
·
2014
·Vol. 70
·期 11
·1050-1053
·
IF 0.535
Li X.,Wang Z.-G.,Chen H.-H.,Liu S.-G.
The title compound, C18H28O3, was prepared by the reaction of 2,6-di-tert-butylphenol with methyl acrylate under basic conditions using dimethyl sulfoxide as the promoter. The structure of this antioxidant indicates significant strain between the ortho tert-butyl substituents and the phenolic OH group. In spite of the steric crowding of the OH group, it participates in intermolecular hydrogen bonding with the ester carbonyl O atom.
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RSC Advances
·
2026
·Vol. 16
·期 25
·22641-22646
·
IF 6.1
Yining Xuan,Lianbao Ye,Lilan Jin,Weiqi Li
The reaction of α, β-epoxy esters with N-alkyl-1-phenylmethanimine oxides in the presence of a Lewis acid was explored in this study. A substrate sustained-release strategy was successfully employed to overcome the inherent conflict between substrate activation and catalyst poisoning, allowing for the efficient synthesis of a variety of substituted isoxazolidin-3-ones. The reaction employs inexpensive and readily available starting materials, proceeds under mild conditions, and demonstrates broad substrate compatibility. Moreover, when chiral epoxy substrates were used, the products were obtained with high retention of enantiomeric purity.
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TOXICOLOGY AND APPLIED PHARMACOLOGY
·
2026
·
IF 3.6
Shangxiang Feng,Kun Song,Hao Zhang,Zhuoqun Wang,Yuchi Zhao,Zhongyuan Zhao,Chao Wan
This study investigated the effects of Aureusidin on extracellular matrix (ECM) degradation and pyroptosis of chondrocytes in osteoarthritis. Network pharmacology, molecular docking, and pull-down assays were initially conducted to explore the target of Aureusidin. Subsequently, Sprague-Dawley rats underwent anterior cruciate ligament transection (ACLT) received oral administration of Aureusidin. Cartilage damage was evaluated histopathologically by H&E and Safranin O-fast green staining. Primary rat chondrocytes were treated with Aureusidin under IL-1β stimulation. Pyroptotic morphology was observed under light microscopy. Propidium iodide staining and flow cytometry were conducted to evaluate membrane rupture. The expression of markers associated with ECM degradation and pyroptosis was analyzed by qRT-PCR, Western blot, immunohistochemistry, and ELISA. Caspase-3 was identified as a target for Aureusidin. Aureusidin (5, 10, 20 mg/kg) alleviated ACLT-induced cartilage damage and ECM degradation. It reduced the OARSI score and serum levels of CTX-II and COMP, while upregulating the expression of Col2a1 and Acan , and downregulating Adamts5 , Mmp13 , and Mmp3 . Aureusidin also mitigated atypical pyroptosis, evidenced by inhibited expression of GSDME-N, Caspase-3, and Cleaved-Caspase-3, and decreased levels of IL-1β and IL-18. In IL-1β-stimulated primary chondrocytes, Aureusidin (5, 10, 20 μM) attenuated ECM degradation and Caspase-3/GSDME-mediated pyroptosis. Treating chondrocytes with the Caspase-3 inhibitor Z -DEVD-FMK under IL-1β-stimulated conditions alleviated ECM degradation and pyroptosis, but the additional application of Aureusidin did not provide further inhibition. Aureusidin has the potential to inhibit ECM degradation and Caspase-3/GSDME-mediated chondrocyte pyroptosis during osteoarthritis progression. Its therapeutic effects are dependent on binding to and modulating the Caspase-3.
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POLYHEDRON
·
2025
·
IF 2.6
Runqing Liu,Yuntian Zhao,Jiming Huang,Shibo Guan,Senling Leng
A new mixed rare-earth metal borate, Cd 3 Sc(BO 3 ) 3 was synthesized via a high-temperature solution method. Single-crystal X-ray diffraction reveals that it crystallizes in the trigonal space group R 3 ¯ (No. 148) with lattice parameters a = 11.5902(19) Å, c = 9.4230(14) Å, and Z = 6. The structure exhibits 1D ∞ [ScB 6 O 18 ] chains comprised of Sc-centered O octahedra and BO 3 triangles, and Cd atoms located in the space to balance charge. The synthesis, single crystal growth, thermal behavior, IR, Raman and UV–vis-NIR diffuse reflectance spectrums, luminescent property of the title compound have been characterized and analyzed. First-principles simulations for Cd 3 Sc(BO 3 ) 3 have been employed to rationalize the correlations between the molecular structure and optical properties.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Jin Han,Maowen Xu,Yubin Niu,Min Jia,Ting Liu,Chang Ming Li
A novel cubic KTi 2 (PO 4 ) 3 is successfully synthesized via a facile hydrothermal method combined with a subsequent annealing treatment and further used as electrode material for sodium-ion batteries for the first time. For comparison, carbon-coated KTi 2 (PO 4 ) 3 obtained by a normal cane sugar-assisted method reveals superior electrochemical performances in sodium-ion battery. Besides of the high coulombic efficiency of nearly 100% after 100 cycles, a stable capacity of 112 mA h g −1 can be achieved at 0.5 C after 100 cycles, and still maintains to 105 mA h g −1 after 500 cycles with capacity retention of approximately 90%.
研究领域:
材料科学
·
电化学
·
储能
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CHEMOSPHERE
·
2021
·
IF 7.086
LingYan Liu,ChunHong Zhang,ShuangRong Chen,Lan Ma,YingMei Li,YiFeng Lu
La(OH) 3 -modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO 3 − , HCO 3 − , and CO 3 2− ), and the presence of NH 4 + has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
研究领域:
环境科学
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材料科学
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水处理
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吸附技术
·
生物炭改性
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Frontiers in Microbiology
·
2022
·
IF 6.064
Olasunkanmi Oluwatayo Israel,Mageto James,Avala Ntsigouaye Juval,Yi Ming,Fei Yanru,Chen Yang,Chen Sijia,Xu Weizhen,Lin Lexun,Zhao Wenran,Wang Yan,Zhong Zhao-Hua
Coxsackievirus group B (CVB) is a member of the genus Enterovirus in the family Picornaviridae. CVB infection has been implicated as a major etiologic agent of viral myocarditis, dilated cardiomyopathy, meningitis, and pancreatitis among children and young adults. Until date, no antiviral agent has been licensed for the treatment of Coxsackievirus infection. In an effort to identify antiviral agents against diseases caused by the CVB, we found that ethyl 3-hydroxyhexanoate (EHX), a volatile compound present in fruits and food additives, is a potent antiviral compound. In this study, we demonstrated that EHX treatment significantly inhibits CVB replication both in vivo and in vitro. Furthermore, EHX possesses antiviral activity at 50% effective concentration (EC50) of 1.2 μM and 50% cytotoxicity (CC50) of 25.6 μM, yielding a selective index (SI) value as high as 20.8. Insights into the mechanism of antiviral activity of EHX showed that it acts at the step of viral RNA replication. Since EHX has received approval as food additives, treatment of CVB-related infections with EHX might be a safe therapeutic option and may be a promising strategy for the development of semi-synthetic antiviral drugs for viral diseases.
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JOURNAL OF CHEMICAL CRYSTALLOGRAPHY
·
2022
·Vol. 53
·期 1
·145-151
·
IF 0.582
Zhang Lirong,Qi Feiyan,Shele Muge,Namila E.,Qi Liming,Baiyin Menghe
One quaternary selenidoantimonate of [Mn(en) 3 ]CdSb 2 Se 5 ( 1 ) (en = ethylenediamine) was prepared under 1,2-propanediamine condition by mild solvothermal method. Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in the monoclinic space group C 2/c. Its structure consists of infinite 1D [CdSb 2 Se 5 ] n 2n− anionic chains and [Mn(en) 3 ] 2+ cations. Meanwhile, “Z” shaped eight-membered [Cd 2 Sb 2 Se 4 ] and six-membered [CdSb 2 Se 3 ] rings are alternately found. As estimated from UV–Vis absorption spectrum, the band gap of 1 is 2.58 eV. Compound 1 also showed rapid response and excellent reproducibility based on photoelectric test. In addition, the magnetic and other properties of 1 were studied. Graphical Abstract The manuscript describes the synthesis, crystal structure, single-crystal X-ray diffraction, elemental analysis, photoelectric response, thermogravimetric analysis, magnetic properties, infrared spectroscopy and UV-Vis diffuse reflectance spectroscopy of [Mn(en) 3 ]CdSb 2 Se 5 . The photoelectric response of compound 1 was explored, and a highly repetitive and stable photocurrent curve was found, indicating that 1 is a typical p-type semiconductor. In addition, the magnetism of compound 1 was also studied, which showed that 1 had antiferromagnetic behavior.
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RSC Advances
·
2022
·Vol. 12
·期 38
·25068-25080
·
IF 4.036
Fen-Fen Yang,Ming-Shan Shuai,Xiang Guan,Mao Zhang,Qing-Qing Zhang,Xiao-Zhong Fu,Zong-Qin Li,Da-Peng Wang,Meng Zhou,Yuan-Yong Yang,Ting Liu,Bin He,Yong-Long Zhao
Multi-drug-resistant microbial pathogens are a serious global health problem. New compounds with antibacterial activity serve as good candidates for developing novel antibacterial drugs which is very urgent and important. In this work, based on the unique scaffold of indirubin, an active ingredient of traditional Chinese medicine formulation Danggui Luhui Wan, we synthesized 29 indirubin-3′-monoximes and preliminarily evaluated their antibacterial activities. The antibacterial activity results demonstrated that the synthesized indirubin-3′-monoximes 5a–5z and 5aa–5ad displayed good potency against S. aureus ATCC25923 (MIC = 0.4–25.6 μg mL−1). Among them, we found that the 5-F, 5-Cl and 7-CF3 substituted indirubin-3′-monoximes 5r, 5s and 5aa also showed better antibacterial efficiency for S. aureus (MICs up to 0.4 μg mL−1) than the prototype natural product indirubin (MIC = 32 μg mL−1). More importantly, indirubin-3′-monoxime 5aa has certain synergistic effect with levofloxacin against clinic multidrug-resistant S. aureus (fractional inhibitory concentration index: 0.375). In addition, relevant experiments including electron microscopy observations, PI staining and the leakage of extracellular potassium ions and nucleic acid (260 nm) have been performed after treating S. aureus with indirubin-3′-monoxime 5aa, and the results revealed that indirubin-3′-monoximes could increase the cell membrane permeability of S. aureus. Although indirubin-3′-monoxime 5aa showed some cytotoxicity toward SH-SY5Y cells relative to compounds 5r and 5s, the skin irritation test of male mice after shaving showed that compound 5aa at a concentration of 12.8 μg mL−1 had no toxicity to mouse skin, and it could be used as a leading compound for skin antibacterial drugs.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Di Wu,Ran Duan,Lan Tang,Xia Hu,Fang Geng,Qiaomei Sun,Yin Zhang,Hui Li
The interaction between lipase and quercetin 3-rhamnoside was studied by fluorescence spectroscopy, enzyme kinetics, and molecular dynamics simulation. The results showed that quercetin 3-rhamnoside had a strong quenching effect on the intrinsic fluorescence of lipase. The binding constant decreased with increasing temperature, and the number of binding sites approached 1. Thermodynamic parameters indicated that hydrogen bonding and van der Waals forces are the dominant forces when the interaction occurs. Circular dichroism spectroscopy and infrared spectroscopy proved that the ligand perturbed the structure of lipase. Enzyme kinetics results showed that quercetin 3-rhamnoside inhibited lipase, and the inhibitory effect was dose-dependent. Molecular dynamics simulation further explained the interaction mechanism and inhibitory effect. This study confirmed the inhibitory effect of quercetin 3-rhamnoside on lipase explained their binding mechanism, which will contribute to guiding the development of fat-reducing functional foods.
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BMC Complementary Medicine and Therapies
·
2021
·Vol. 21
·期 1
·1-11
·
IF 0
Lou Hai-xia,Fu Wen-cheng,Chen Jia-xiang,Li Tian-tian,Jiang Ying-ying,Liu Chun-hui,Zhang Wen
Background Alisol A 24-acetate (AA-24-a), one of the main active triterpenes isolated from the well-known medicinal plant Alisma orientale (Sam.) Juz., exhibits multiple biological activities including hypolipidemic activity. However, its effect on lipid metabolism in adipocytes remains unclear. The present study aimed to clarify the effect of AA-24-a on adipocyte lipolysis and to determine its potential mechanism of action using 3 T3-L1 cells. Methods We assayed the release of glycerol into culture medium of 3 T3-L1 cells under treatment with AA-24-a. Protein and mRNA expression and phosphorylation levels of the main lipases and kinases involved in lipolysis regulation were determined by quantitative polymerase chain reaction and western blotting. Specific inhibitors of protein kinase A (PKA; H89) and extracellular signal-regulated kinase (ERK; PD98059), which are key enzymes in relevant signaling pathways, were used to examine their roles in AA-24-a-stimulated lipolysis. Results AA-24-a significantly stimulated neutral lipolysis in fully differentiated adipocytes. To determine the underlying mechanism, we assessed the changes in mRNA and protein levels of key lipolysis-related genes in the presence or absence of H89 and PD98059. Both inhibitors reduced AA-24-a-induced lipolysis. Moreover, pretreatment with H89 attenuated AA-24-a-induced phosphorylation of hormone-sensitive lipase at Ser660, while pretreatment with PD98059 attenuated AA-24-a-induced downregulation of peroxisome proliferator-activated receptor-γ and perilipin A. Conclusions Our results indicate that AA-24-a promoted neutral lipolysis in 3 T3-L1 adipocytes by activating PKA-mediated phosphorylation of hormone-sensitive lipase and ERK- mediated downregulation of expression of perilipin A.
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PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2021
·
IF 4.27
Xuqiu He,Ronghao Huang,Lipeng Liu,Yingying Li,Wenzhao Wang,Qingshan Xu,Youben Yu,Tianshan Zhou
Anthocyanins are a group of natural water-soluble pigments in plants that contribute to the pink-purple color of a range of tissues. Because anthocyanins have various biological activities in human health, there is great research interest in the development of anthocyanin-rich foods and beverages, including purple shoot tea. Anthocyanidin 3- O -galactosides have been identified as one of the main anthocyanin components in purple shoot tea, but the enzyme responsible for their biosynthesis remains unclear. UDP-galactose anthocyanidin 3- O -galactosyltransferase (UA3GalT) is presumed to catalyze the galactosylation of anthocyanidin. Therefore, we assayed the UA3GalT activity in five tea samples with varying degrees of purple color and found that its activity was strongly positively correlated (r = 0.929, p < 0.05) with anthocyanin content. Phylogenetic analysis and sequence alignment suggested that CsUGT78A15 encoded a UA3GalT enzyme. Enzymatic assays indicated that r Cs UGT78A15 could catalyze the synthesis of cyanidin 3- O -galactoside and delphinidin 3- O -galactoside using UDP-galactose as a sugar donor, and it showed higher catalytic efficiency towards delphinidin than cyanidin. These results indicate that Cs UGT78A15 acts as a UA3GalT in vitro . Subcellular localization showed that Cs UGT78A15 was located in the endoplasmic reticulum (ER) and nucleus, consistent with the location of anthocyanin synthesis. Transient overexpression of CsUGT78A15 in the fruit of mature ‘Granny Smith’ apples showed that the upregulation of CsUGT78A15 promoted cyanidin 3- O -galactoside accumulation in apple skins. These results suggested that Cs UGT78A15 could catalyze galactosylation of anthocyanidins in planta . Our findings provide insight into the biosynthesis of anthocyanins in tea plants .
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