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Tang MP, Zhu L, Deng Y, Shi Y, Lai SKM, Mo X, Pang XY, Liu C, Jiang W, Tse ECM, Au-Yeung HY. Water and Air Stable Copper(I) Complexes of Tetracationic Catenane Ligands for Oxidative C-C Cross-Coupling. Angew Chem Int Ed Engl 2024:e202405971. [PMID: 38661248 DOI: 10.1002/anie.202405971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 04/24/2024] [Accepted: 04/25/2024] [Indexed: 04/26/2024]
Abstract
Aqueous soluble and stable Cu(I) molecular catalysts featuring a catenane ligand composed of two dicationic, mutually repelling but mechanically interlocked macrocycles are reported. The ligand interlocking not only fine-tunes the coordination sphere and kinetically stabilizes the Cu(I) against air oxidation and disproportionation, but also buries the hydrophobic portions of the ligands and prevents their dissociation which are necessary for their good water solubility and a sustained activity. These catenane Cu(I) complexes can catalyze the oxidative C-C coupling of indoles and tetrahydroisoquinolines in water, using H2O2 as a green oxidant with a good substrate scope. The successful use of catenane ligands in exploiting aqueous Cu(I) catalysis thus highlights the many unexplored potential of mechanical bond as a design element for exploring transition metal catalysis under challenging conditions.
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Affiliation(s)
| | - Lihui Zhu
- University of Hong Kong, Chemistry, HONG KONG
| | - Yulin Deng
- University of Hong Kong, Chemistry, HONG KONG
| | - Yixiang Shi
- University of Hong Kong, Chemistry, HONG KONG
| | | | - Xiaoyong Mo
- University of Hong Kong, Chemistry, HONG KONG
| | - Xin-Yu Pang
- South University of Science and Technology of China, Chemistry, CHINA
| | - Chunyu Liu
- Jiangnan University, Key Laboratory of Eco-Textiles, CHINA
| | - Wei Jiang
- South University of Science and Technology of China, Chemistry, CHINA
| | | | - Ho Yu Au-Yeung
- The University of Hong Kong, Department of Chemistry, Chong Yuet Ming Chemistry Building, Pokfulam Road, NA, Hong Kong, HONG KONG
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2
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Li MS, Dong YW, Pang XY, Chai H, Wang X, Jiang W. The Influence of Small Biomolecules, Salts and Buffers on the Molecular Recognition of Amide Naphthotube in Aqueous Solutions. Chemistry 2023; 29:e202202972. [PMID: 36196913 DOI: 10.1002/chem.202202972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Indexed: 11/18/2022]
Abstract
We found the binding affinities of amide naphthotube to neutral organic molecules in water are not influenced by most of small biomolecules, inorganic salts, and PBS and Tris buffers but are reduced in HEPES buffer through competitive binding. Nevertheless, salts do change the binding affinities of amide naphthotube to charged molecules through a screening effect.
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Affiliation(s)
- Ming-Shuang Li
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China
| | - Yi-Wei Dong
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China
| | - Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China
| | - Hongxin Chai
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China.,Shenzhen Xinhua Middle School, Shenzhen, 518109, P. R. China
| | - Xiaoping Wang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, P. R. China
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3
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Yao H, Li SY, Zhang H, Pang XY, Lu JL, Chen C, Jiang W, Yang LP, Wang LL. Tetralactam macrocycle based indicator displacement assay for colorimetric and fluorometric dual-mode detection of urinary uric acid. Chem Commun (Camb) 2023; 59:5411-5414. [PMID: 37063081 DOI: 10.1039/d2cc06622j] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
An indicator displacement assay for colorimetric and fluorometric dual-mode detection of urinary uric acid was constructed by water-soluble naphthalene-based tetralactam macrocycle and phenoxazine dye resorufin. The visual detection of uric...
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Affiliation(s)
- Huan Yao
- School of Pharmaceutical Science, Postdoctoral Research Station of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Shi-Yao Li
- School of Pharmaceutical Science, Postdoctoral Research Station of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Hong Zhang
- Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Xin-Yu Pang
- Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Jia-Le Lu
- School of Pharmaceutical Science, Postdoctoral Research Station of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Cong Chen
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China
| | - Wei Jiang
- Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Liu-Pan Yang
- School of Pharmaceutical Science, Postdoctoral Research Station of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
| | - Li-Li Wang
- School of Pharmaceutical Science, Postdoctoral Research Station of Basic Medicine, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, China.
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4
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Quan M, Pang XY, Jiang W. Circular Dichroism Based Chirality Sensing with Supramolecular Host-Guest Chemistry. Angew Chem Int Ed Engl 2022; 61:e202201258. [PMID: 35315199 DOI: 10.1002/anie.202201258] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Indexed: 12/12/2022]
Abstract
Optical methods are promising to address the ever-increasing demands for chirality analysis in drug discovery and related fields because they are amenable to high-throughput screening. Circular dichroism-based chiroptical sensing using host-guest chemistry is especially appealing due to the fast equilibrium kinetics, wide substrate scope, and potential for sustainable development. In this Minireview, we give an overview on this emerging field. General aspects of molecular recognition and chirality transfer are analyzed. Chirality sensors are discussed by dividing them into three classes according to their structural features. Applications of these chirality sensors for chirality analysis of the products of asymmetric reactions and for the real-time monitoring of reaction kinetics are demonstrated with selected examples. Moreover, challenges and research directions in this field are also highlighted.
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Affiliation(s)
- Mao Quan
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology (SUSTech), Xueyuan Blvd 1088, Shenzhen, 518055, China
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5
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Wang X, Quan M, Yao H, Pang XY, Ke H, Jiang W. Switchable bifunctional molecular recognition in water using a pH-responsive Endo-functionalized cavity. Nat Commun 2022; 13:2291. [PMID: 35484144 PMCID: PMC9051166 DOI: 10.1038/s41467-022-30012-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 04/08/2022] [Indexed: 11/09/2022] Open
Abstract
The construction of water-soluble synthetic hosts with a stimuli-responsive endo-functionalized cavity is challenging. These hosts feature a switchable cavity and may bring new properties to the fields of self-assembly, molecular machines, and biomedical sciences. Herein, we report a pair of water-soluble naphthotubes with a pH-responsive endo-functionalized cavity. The inward-directing secondary amine group of the hosts can be protonated and deprotonated. Thus, the hosts have different cavity features at the two states and show drastically different binding preference and selectivity in water. We reveal that the binding difference of the two host states is originated from the differences in charge repulsion, hydrogen bonding and the hydrophobic effects. Moreover, the guest binding can be easily switched in a ternary mixture with two guest molecules by adjusting the pH value of the solution. These pH-responsive hosts may be used for the construction of smart self-assembly systems and water-soluble molecular machines.
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Affiliation(s)
- Xiaoping Wang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China
| | - Mao Quan
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China
| | - Huan Yao
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China
| | - Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China
| | - Hua Ke
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, 518055, Shenzhen, China.
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6
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Zhang H, Wang LL, Pang XY, Yang LP, Jiang W. Molecular recognition and photoprotection of riboflavin in water by a biomimetic host. Chem Commun (Camb) 2021; 57:13724-13727. [PMID: 34871338 DOI: 10.1039/d1cc05818e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A water-soluble tetralactam macrocycle with 2,6-diethoxynaphthalene groups as side walls is able to strongly bind riboflavin (Ka >107 M-1) in water through hydrogen bonding and the hydrophobic effect. The encapsulated riboflavin can be stabilized by the host against photo-degradation under UV-vis irradiation, which may be harnessed to extend the shelf life of riboflavin.
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Affiliation(s)
- Hong Zhang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China.
| | - Li-Li Wang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China. .,Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study&Department of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, China.
| | - Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China.
| | - Liu-Pan Yang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China.
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China.
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7
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Zhou H, Pang XY, Wang X, Yao H, Yang LP, Jiang W. Biomimetic Recognition of Quinones in Water by an Endo-Functionalized Cavity with Anthracene Sidewalls. Angew Chem Int Ed Engl 2021; 60:25981-25987. [PMID: 34569134 DOI: 10.1002/anie.202112267] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Indexed: 12/27/2022]
Abstract
Selective molecular recognition in water is the foundation of numerous biological functions but is a challenge for most synthetic hosts. We employ the concept of endo-functionalized cavity and the strategy of simultaneous construction to address this issue. The concept and the strategy were demonstrated in the construction of a biomimetic host for selectively recognizing quinones in water. The host was synthesized by joining two pieces of bent anthracene dimer through amide bond formation, affording a deep hydrophobic cavity and inward-directing hydrogen bonding sites. The host can recognize quinones over their close analogues in water, and its association affinity to p-benzoquinone is the highest among all the known hosts and is even comparable to that of the bioreceptor. The binding with an anthraquinone reaches nanomolar affinity. Shielded hydrogen bonding, C-H⋅⋅⋅π, and charge transfer interactions, and the hydrophobic effect are responsible for the high binding affinity and selectivity.
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Affiliation(s)
- Hang Zhou
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Xiaoping Wang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Huan Yao
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Liu-Pan Yang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
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8
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Abstract
A molecular box with an electron-rich cavity, namely naphthobox, was contructed and showed selective binding to planar aromatic cations.
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Affiliation(s)
- Xin-Yu Pang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Hang Zhou
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Huan Yao
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
| | - Wei Jiang
- Shenzhen Grubbs Institute, Guangdong Provincial Key Laboratory of Catalysis, and Department of Chemistry, Southern University of Science and Technology, Xueyuan Blvd 1088, Shenzhen, 518055, China
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9
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Ragab ES, Lu J, Pang XY, Nassar KS, Yang BY, Zhang SW, Lv JP. Effect of thermosonication process on physicochemical properties and microbial load of goat's milk. J Food Sci Technol 2019; 56:5309-5316. [PMID: 31749478 DOI: 10.1007/s13197-019-04001-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 06/05/2019] [Accepted: 07/31/2019] [Indexed: 10/26/2022]
Abstract
In this study, thermosonication was used as a combined treatment of raw goat milk (RGM) using pasteurization (72 °C for 15 s) and ultrasound treatments (20 kHz at the power variance of 150 W, 200 W, 300 W and 400 W for 10 min). Investigation on the impact of the microbial load, protein content, protein aggregation, the particle size of fat and casein micelles, pH, viscosity, turbidity, color, and soluble calcium and phosphorus contents were carried out, whiles RGM and PGM served as the control. Our results revealed that at 400 W, that thermosonication resulted in a significant reduction (α = 0.05) in the microbial load of the samples to less than 2.3 log cfu/mL in comparison to those of RGM and pasteurized goat milk (PGM) at 5.94 log cfu/mL and 4.76 log cfu/mL respectively. In RGM, the fat size (3.5 µm) decreased to 0.4 µm at 300 W; while those of casein micelles also decreased from 406 to 256.4 nm at 400 W. However, no significant effect was observed in the color and soluble calcium and phosphorus contents of all samples. The effect on the microbial load and fat homogenization would promote thermosonication process in the dairy industry.
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Affiliation(s)
- E S Ragab
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China.,2Faculty of Agriculture, Damanhour University, Damanhour, 22516 Egypt
| | - J Lu
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China
| | - X Y Pang
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China
| | - K S Nassar
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China.,2Faculty of Agriculture, Damanhour University, Damanhour, 22516 Egypt
| | - B Y Yang
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China
| | - S W Zhang
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China
| | - J P Lv
- 1Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, No.2 Yuan Ming Yuan West Road, Haidian District, Beijing, 100193 China
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10
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Abstract
Strong positive allosteric cooperativity was achieved in a low-symmetry ternary complex with two different hosts on one guest.
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Affiliation(s)
- Hongxin Chai
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
- College of Chemistry, Nankai University
| | - Liu-Pan Yang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
| | - Hua Ke
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
| | - Xin-Yu Pang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
| | - Wei Jiang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
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11
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Yao H, Yang LP, Pang XY, Li JR, Jiang W. Self-assembly of two-dimensional structures in water from rigid and curved amphiphiles with a low molecular weight. Chem Commun (Camb) 2018; 54:10847-10850. [DOI: 10.1039/c8cc04570d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rigid and curved amphiphiles with very low molecular weight (MW < 500 Da) self-assemble into two-dimensional structures in water.
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Affiliation(s)
- Huan Yao
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
- College of Chemistry and Chemical Engineering
| | - Liu-Pan Yang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
| | - Xin-Yu Pang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
| | - Jia-Rong Li
- College of Chemistry and Chemical Engineering
- Beijing Institute of Technology
- Beijing
- China
| | - Wei Jiang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- China
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12
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Chang HH, Cao RX, Yang CC, Wei WL, Pang XY, Qiao Y. Interactions of acylated methylglucoside derivatives with CO2: simulation and calculations. J Mol Model 2016; 22:39. [PMID: 26781667 DOI: 10.1007/s00894-015-2903-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Accepted: 12/28/2015] [Indexed: 10/22/2022]
Abstract
Carbohydrates have drawn considerable interest from researchers recently due to their affinity for CO2. However, most of the research in this field has focused on peracetylated derivatives. Compared with acetylated carbohydrates, which have already been studied in depth, methyl D-glucopyranoside derivatives are more stable and could have additional applications. Thus, in the present work, ab initio calculations were performed to elucidate the characteristics of the interactions of methylglucoside derivatives with CO2, and to investigate how the binding energy (ΔE) is affected by isomerization or the introduction of various acyl groups. Four methyl D-glucopyranosides (each with two anomers) bearing acetyl, propionyl, butyryl, and isobutyryl moieties, respectively, were designed as substrates, and the 1:1 complexes of a CO2 molecule with each of these sugar substrates were modeled. The results indicate that ΔE is mainly influenced by interaction distance and the number of negatively charged donors or interacting pairs in the complex; the structure of the acyl group present in the substrate is a secondary influence. Except in the case of methyl 2-O-acetyl-D-glucopyranose, the ΔE values of the α- and β-anomers of each methylglucoside were found to be almost the same. Therefore, we would expect the CO2 affinities of the four derivatives studied here to be as strong as or even stronger than that of peracetylated D-glucopyranose. Graphical Abstract The binding energy between methyl D-glucopyranoside derivatives with various substituted acyl groups and CO2 are evaluated by ab initio calculations. The strong interaction between these methyl dglucopyranoside derivatives and CO2 showed the potential of their application for CO2 capture.
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Affiliation(s)
- H H Chang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - R X Cao
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - C C Yang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - W L Wei
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
| | - X Y Pang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.
| | - Y Qiao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, Shanxi, China.
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13
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Abstract
Abstract
Our aim was to investigate whether renal impairment induced by cisplatin altered the pharmacokinetics of antofloxacin. Antofloxacin (7.5 mg kg−1, i.v.) was given to normal or renally impaired rats (induced by cisplatin). Concentrations of antofloxacin in plasma and urine were measured using HPLC. Pharmacokinetic parameters were estimated. The plasma concentrations of antofloxacin in the renally impaired rats were significantly higher than those in the normal rats, accompanied by significant increase of the area under the plasma concentration-time curve (AUC) (968.78 ± 259.39 μg min mL−1 versus 509.84 ± 46.19 μg min mL−1 in normal rats P < 0.05). The system clearance (CL) and renal clearance (CLR) of antofloxacin decreased from 12.66 ± 1.15 mL kg−1 min−1 and 3.21 ± 1.80 mLkg−1 min−1 in normal rats, to 6.63 ± 2.82 mLkg−1 min−1 and 0.31 ± 0.15 mLkg−1 min−1, respectively. No differences between two treatments in half-life and mean residence time were found. We concluded that renal impairment induced by cisplatin significantly altered the pharmacokinetics of antofloxacin and resulted in decrease of the renal elimination.
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Affiliation(s)
- X Y Pang
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
| | - L Liu
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
| | - D M Zhang
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
| | - G J Wang
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
| | - L Xie
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
| | - X D Liu
- Jiangsu Key Laboratory for Drug Metabolism and Pharmacokinetics, China Pharmaceutical University, No. 24 Tongjiaxiang, Nanjing 210009, PR China
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14
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He XP, Li XX, Bi YW, Yue WM, Sun WY, Pang XY, Gu XH. The proteasome inhibitor bortezomib inhibits intimal hyperplasia of autologous vein grafting in rat model. Transplant Proc 2008; 40:1722-6. [PMID: 18589180 DOI: 10.1016/j.transproceed.2008.01.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2007] [Revised: 12/21/2007] [Accepted: 01/16/2008] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Increasing evidence indicates that inflammation plays an important role in intimal hyperplasia (IH) induced by autologous vein grafts. The proteasome inhibitor bortezomib shows anti-inflammatory effects, so we used an autologous vein transplantation model to test whether bortezomib inhibits neointimal formation in transplant-induced vasculopathy. MATERIALS AND METHODS We subjected 88 rats to autologous external jugular vein grafting surgery randomly assigned to be treated with bortezomib or vehicle. After 24 or 72 hours, rats were humanely killed and vein grafts processed for real-time RT-PCR (24 and 72 hours), ELISA (24 hours), or neutrophil chemotaxis assay (24 hours). Subsequently, rats were humanely killed at 1 and 2 weeks after grafting with samples processed for morphometric analysis. RESULTS Bortezomib significantly inhibited IH at 2 weeks compared with untreated controls (P < .05). Expression of mRNA for vascular cell adhesion molecule-1, intercellular adhesion molecule-1, cytokine-induced neutrophil chemoattractant 2beta, monocyte chemoattractant-1, interleukin (IL)-1, IL-6, and tumor necrosis factor-alpha markedly increased in injured vessels during the first day after surgery declining over the following 3 days. Bortezomib significantly attenuated gene expression and protein levels of most inflammatory mediators (P < .05), simultaneously inhibiting neutrophil chemotactic activity of vessel homogenates. CONCLUSIONS Bortezomib inhibited neointimal formation at least partially by attenuating the inflammatory response in transplant-induced vasculopathy. It may become a novel vasoprotective agent in the clinical field.
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Affiliation(s)
- X P He
- Department of Cardiovascular Surgery, Qi Lu Hospital of Shandong University, Jinan, Shandong Province, China
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Pang XY, Wang JY, Zhao FS. [Construction of yeast fusants of directly transform starch into ethanol]. Sheng Wu Gong Cheng Xue Bao 2001; 17:165-9. [PMID: 11411224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
To obtain strains that are able to efficiently produce ethanol directly from starchy material, we have used the protoplast fusion technique to construct hybrids between Saccharomyces cerevisiae and Candida tropicalis. The isolation of fusants used a selective system by a irreversible biochemical inhibitor-Iodoacetic Acid(ID), and the fusion frequency was 9.2 x 10(-6). The cell size and DNA content of the fusants were determined. Through testing some productive properties such as specific growth rate, saccharification ability, ethanol tolerance and the activities of alpha-amylase, saccharogen amylase, we selected two fusants--F-1 and F-5. They were more superior and their ethanol production came up to 8.8% and 11.5%.
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Affiliation(s)
- X Y Pang
- College of Science & Technology, Shanghai Jiaotong University, Shanghai 200240, China
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