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Chen X, Wang C, Wang C, Liu C, Yuan Y, Wang B, Wu G, Han Y, Zhao Y, Wu Z, Li X. The emulsification properties of alkaline-extracted polysaccharide conjugates from Apocynum venetum L. tea residues. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107315] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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2
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Duan T, Ma H, Dong Y, Yang F, Liu X. Microemulsion liquid chromatographic method for simultaneous separation and determination of five isoflavones in red clover. J LIQ CHROMATOGR R T 2021. [DOI: 10.1080/10826076.2020.1866599] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tianjiao Duan
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, People’s Republic of China
- School of Pharmacy, Lanzhou University, Lanzhou, People’s Republic of China
| | - Haixia Ma
- School of Pharmacy, Lanzhou University, Lanzhou, People’s Republic of China
| | - Yuming Dong
- School of Pharmacy, Lanzhou University, Lanzhou, People’s Republic of China
| | - Fatang Yang
- School of Pharmacy, Lanzhou University, Lanzhou, People’s Republic of China
| | - Xiaofeng Liu
- School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, People’s Republic of China
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3
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Pankajkumar-Patel N, Peris-García E, Schiopu O, Ruiz-Angel MJ, Baeza-Baeza JJ, García-Alvarez-Coque MC. Performance and modelling of retention in microemulsion liquid chromatography. J Chromatogr A 2020; 1634:461651. [PMID: 33166895 DOI: 10.1016/j.chroma.2020.461651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/23/2020] [Accepted: 10/24/2020] [Indexed: 10/23/2022]
Abstract
The capability of liquid chromatography with microemulsions (MEs) as mobile phases was studied for the analysis of four parabens (butylparaben, ethylparaben, methylparaben, and propylparaben) and seven β-adrenoceptor antagonists (acebutolol, atenolol, carteolol, metoprolol, oxprenolol, propranolol, and timolol). MEs were formed by mixing aqueous solutions of the anionic surfactant sodium dodecyl sulphate, the alcohol 1-butanol that played the role of co-surfactant, and octane as oil. In order to guarantee the formation of stable MEs, a preliminary study was carried out to determine the appropriate ranges of concentrations of the three components. For this purpose, mixtures of variable composition were prepared, and the possible separation of two phases (formation of an emulsion) was visually detected. The advantage offered by the addition of octane to micellar mobile phases, inside the concentration range that allows the formation of stable MEs, was evaluated by comparing the retention behaviour, peak profile and resolution of mixtures of the probe compounds, in the presence and absence of octane. The final aim of this work was the proposal of a mathematical equation to model the retention behaviour in microemulsion liquid chromatography. The derived global model that considered the three factors (surfactant, alcohol and oil) allowed the prediction of retention times at diverse mobile phase compositions with satisfactory accuracy (in the 1.1‒2.5% range). The behaviour was compared with that found with mobile phases without octane. The model also yielded information about the retention mechanism and revealed that octane, when inserted inside the micelle, modifies the interaction between solutes and micelles.
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Affiliation(s)
- N Pankajkumar-Patel
- Department of Analytical Chemistry, University of Valencia, c/Dr. Moliner 50, Burjassot, Spain
| | - E Peris-García
- Department of Analytical Chemistry, University of Valencia, c/Dr. Moliner 50, Burjassot, Spain
| | - O Schiopu
- Department of Analytical Chemistry, University of Valencia, c/Dr. Moliner 50, Burjassot, Spain
| | - M J Ruiz-Angel
- Department of Analytical Chemistry, University of Valencia, c/Dr. Moliner 50, Burjassot, Spain
| | - J J Baeza-Baeza
- Department of Analytical Chemistry, University of Valencia, c/Dr. Moliner 50, Burjassot, Spain
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Jalali-Jivan M, Garavand F, Jafari SM. Microemulsions as nano-reactors for the solubilization, separation, purification and encapsulation of bioactive compounds. Adv Colloid Interface Sci 2020; 283:102227. [PMID: 32781299 DOI: 10.1016/j.cis.2020.102227] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 07/28/2020] [Accepted: 07/28/2020] [Indexed: 02/06/2023]
Abstract
Bioactive components possess various functionalities and are most interested for different food, nutraceutical and pharmaceutical formulations. The current review will discuss the preparation methods and fabrication techniques to design microemulsions (MEs) for the solubilization, separation, encapsulation and purification of various agro-food bioactive compounds. ME systems have shown suitable potential in enhancing oil recovery, protein extraction, and isolation of bioactive compounds. Moreover, the capability of ME based systems as drug and nutraceutical delivery cargos, and synthesis of various organic and inorganic nanoparticles, especially using biopolymers, will be investigated. ME liquid membranes are also developed as nano-extractor/nano-reactor vehicles, capable of simultaneous extraction, encapsulation or even synthesis of hydrophilic and lipophilic bioactive compounds for food, nutraceutical and drug applications.
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Affiliation(s)
- Mehdi Jalali-Jivan
- Food Colloids and Rheology Lab, Department of Food Science and Technology, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran
| | - Farhad Garavand
- Department of Food Chemistry and Technology, Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Science and Natural Resources, Gorgan, Iran.
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5
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Feng Y, Jiang C, Yang F, Chen Z, Li Z. Apocynum venetum leaf extract protects against H 2O 2-induced oxidative stress by increasing autophagy in PC12 cells. Biomed Rep 2020; 13:6. [PMID: 32607235 PMCID: PMC7323456 DOI: 10.3892/br.2020.1313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/29/2020] [Indexed: 12/15/2022] Open
Abstract
The effect of Apocynum venetum leaf extract (AVLE) on the nervous system has been widely studied, but its effect on injured neurons is not fully understood. In the present study, the protective effect of AVLE on injured neurons was determined. H2O2 was used to induce oxidative stress in PC12 cells and cell viability assays were used to determine the optimum concentration range of AVLE and its protective effects against oxidative stress. A live-dead assay was performed to confirm the effects of AVLE on oxidative stress. Subsequently, expression of apoptotic proteins including Bax and cleaved-caspase-3 were evaluated to determine whether AVLE affected apoptosis, and reactive oxygen species (ROS) levels were detected to determine the role of AVLE in H2O2 exposure. Furthermore, expression of autophagic proteins including LC3-II and p62 were detected to evaluate the effects of AVLE on autophagic activity, and cells were treated with 3-methyladenine (3-MA), an autophagic inhibitor, to identify the underlying protective mechanism of AVLE. The results showed that the optimum conditions to induce oxidative stress were treatment with 40 µM H2O2 for 2 h, and the suitable range of AVLE concentrations was shown to be 1-100 µg/ml. AVLE improved cell viability in PC12 cells following treatment with H2O2. AVLE reduced the expression of Bax and cleaved-caspase-3, and decreased ROS production. Furthermore, AVLE upregulated LC3-II expression and downregulated p62 expression, whereas treatment with 3-MA increased the levels of ROS and apoptotic proteins. These results suggest that AVLE may protect injured neurons against oxidative stress-induced apoptosis, and this effect may be associated with the reduction of ROS by increasing autophagy.
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Affiliation(s)
- Yuelai Feng
- Department of International Baccalaureate Diploma Program, Shanghai Pinghe School, Shanghai 200127, P.R. China
| | - Chang Jiang
- Department of Orthopaedics, Zhongshan Hospital of Fudan University, Shanghai 200032, P.R. China
| | - Feng Yang
- Integrated Traditional and Western Medicine, Zhongshan Hospital of Fudan University, Shanghai 200032, P.R. China
| | - Zixian Chen
- Department of Orthopaedics, Zhongshan Hospital of Fudan University, Shanghai 200032, P.R. China
| | - Zheng Li
- Department of Orthopaedics, Zhongshan Hospital of Fudan University, Shanghai 200032, P.R. China
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6
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Shen J, Yang K, Jiang C, Ma XQ, Zheng MX, Sun CH. Development and application of a rapid HPLC method for simultaneous determination of hyperoside, isoquercitrin and eleutheroside E in Apocynum venetum L. and Eleutherococcus senticosus. BMC Chem 2020; 14:35. [PMID: 32391523 PMCID: PMC7196217 DOI: 10.1186/s13065-020-00687-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 02/29/2020] [Indexed: 02/05/2023] Open
Abstract
Apocynum venetum L. and Eleutherococcus senticosus have been used for hundreds of years to treat hypertension in China. In previous research, there was not a suitable quality control of method for the formulas of Apocynum venetum L. and Eleutherococcus senticosus. It is urgent and essential to develop modern analytical methods for Apocynum venetum L. and Eleutherococcus senticosus to ensure the quality of the formulas. A rapid approach for simultaneous determination of hyperoside, isoquercitrin and eleutheroside E in Apocynum venetum L. and Eleutherococcus senticosus by high-performance liquid chromatography with a diode array detector was described and validated. The full method validation, including the linearity, limits of detection and quantification, precision, repeatability, stability and recovery, was examined. All target components, including isomers of hyperoside and isoquercitrin, were baseline separated in 35 min. The developed method was sensitive, reliable and feasible. With this method, the optimal decoction conditions of Apocynum venetum L. and Eleutherococcus senticosus were selected, and their quality analysis was carried out. Furthermore, an herbal compatibility study of Apocynum venetum L. and Eleutherococcus senticosus based on detecting variations in the content of their active ingredients was performed by the developed HPLC method. It could be an alternative for the quantitative analysis of herbs that contain hyperoside, isoquercitrin or (and) eleutheroside E in the future.
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Affiliation(s)
- Jie Shen
- 1The First Affiliated Hospital of Zhejiang Chinese Medical University, No. 54 Youdian Road, Hangzhou, 310 006 Zhejiang Province China
| | - Kai Yang
- 2The First Affiliated Hospital of Medical School of Zhejiang University, Hangzhou, 310 003 Zhejiang Province China
| | - Cheng Jiang
- 3Department of pharmacy, Tongde Hospital of Zhejiang Province, Hangzhou, 310 012 Zhejiang Province China
| | - Xiao-Qiong Ma
- 1The First Affiliated Hospital of Zhejiang Chinese Medical University, No. 54 Youdian Road, Hangzhou, 310 006 Zhejiang Province China
| | - Min-Xia Zheng
- 1The First Affiliated Hospital of Zhejiang Chinese Medical University, No. 54 Youdian Road, Hangzhou, 310 006 Zhejiang Province China
| | - Cai-Hua Sun
- 1The First Affiliated Hospital of Zhejiang Chinese Medical University, No. 54 Youdian Road, Hangzhou, 310 006 Zhejiang Province China
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7
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Yan H, Zheng ZD, Wu HF, Liu XC, Zhou A. A microemulsion high-performance liquid chromatography (MELC) method for the separation and determination of hydrolyzed tenuifolin in Radix Polygalae. Sci Rep 2019; 9:19108. [PMID: 31836776 PMCID: PMC6910981 DOI: 10.1038/s41598-019-55416-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 11/27/2019] [Indexed: 11/09/2022] Open
Abstract
Tenuifolin was used as a reliable chemical marker for the quality control of Radix Polygalae. The determination of tenuifolin is challenging because the analyte molecule lacks a suitable chromophore. The aim of this study was to establish a microemulsion high-performance liquid chromatography (MELC) method which is robust and sensitive, and can separate and determine tenuifolin in Radix Polygalae using an oil-in-water (O/W) microemulsion mobile phase. The separations were performed on a C18 (4.6 × 250 mm, 5 μm) column at 25 °C using a flow rate of 1.0 mL/min, and an ultraviolet detection wavelength of 210 nm. The microemulsion mobile phase comprised 2.8% (w/v) sodium dodecyl sulfate (SDS), 7.0% (v/v) n-butanol, 0.8% (v/v) n-octane and 0.1% (v/v) aqueous orthophosphate buffer (H3PO4). The linearity analysis of tenuifolin showed a correlation coefficient of 0.9923 in the concentration range of 48.00-960.00 µg/mL. The accuracy of the method based on three concentration levels ranged from 96.23% to 99.28%; the limit of detection (LOD) was 2.34 µg/mL, and the limit of quantification (LOQ) was 6.76 µg/mL. The results of our study indicated that the optimized MELC method was sensitive and robust, and can be widely applied for the separation and determination of tenuifolin in Radix Polygalae.
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Affiliation(s)
- Hui Yan
- Department of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, 230012, P. R. China
| | - Zhuan-Di Zheng
- Department of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, 230012, P. R. China
| | - Hong-Fei Wu
- Department of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, 230012, P. R. China.
| | - Xiao-Chuang Liu
- The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, 230026, P. R. China
| | - An Zhou
- Department of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui, 230012, P. R. China.
- Anhui Province Key Laboratory of Chinese Medicinal Formula, Hefei, Anhui, 230012, P. R. China.
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8
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Nargis M, Ihsan AB, Koyama Y. Bolaamphiphilic properties and pH-dependent micellization of quercetin polyglycoside. RSC Adv 2019; 9:33674-33677. [PMID: 35528900 PMCID: PMC9073524 DOI: 10.1039/c9ra05711k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 10/14/2019] [Indexed: 12/19/2022] Open
Abstract
Quercetin polyglycoside as a new bolaamphiphile is prepared via a one-pot grafting polymerization technique using sugar-based cyclic sulfite. Micelles comprising quercetin polyglycoside exhibit special pH-effects, in which the polyglycoside moieties on the surface of the micelle serve as a steric protecting group to endow chemical stabilization.
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Affiliation(s)
- Mahmuda Nargis
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University 5180 Kurokawa Imizu Toyama 939-0398 Japan
| | - Abu Bin Ihsan
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University 5180 Kurokawa Imizu Toyama 939-0398 Japan
| | - Yasuhito Koyama
- Department of Pharmaceutical Engineering, Faculty of Engineering, Toyama Prefectural University 5180 Kurokawa Imizu Toyama 939-0398 Japan
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9
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Gao P, Nan ZB, Christensen MJ, Barbetti MJ, Duan TY, Liu QT, Meng FJ, Huang JF. Factors Influencing Rust (Melampsora apocyni) Intensity on Cultivated and Wild Apocynum venetum in Altay Prefecture, China. PHYTOPATHOLOGY 2019; 109:593-606. [PMID: 30307801 DOI: 10.1094/phyto-04-18-0145-r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Rust (Melampsora apocyni) on Apocynum venetum is the major constraint to the commercial development of this medicinal herb. To determine the factors influencing rust intensity (maximum disease index [DImax]), rust was investigated from 2011 to 2015 in both cultivated and wild A. venetum plants. Partial least squares path modeling (PLS-PM) was used to analyze the paths and extent of the factors related to pathogen, environment, and host that affect rust intensity. DImax exhibited considerable variations across years and study sites, with variations linked to various factors fostering disease development. PLS-PM explained 80.0 and 70.1% of variations in DImax in cultivated and wild plants, respectively. Precipitation was the key factor determining DImax in both cultivated and wild plants (path coefficient [PC] = 0.313 and 0.544, respectively). In addition, the topsoil water content in cultivated plants and the total vegetation coverage in wild plants were also critical determinants of DImax via their effects on the microclimatic factor (contribution coefficients [CC] = 0.681 and 0.989, respectively; PC = 0.831 and 0.231, respectively). In both cultivated and wild plants, host factors were mainly dominated by A. venetum density (CC = 0.989 and 0.894, respectively), and their effect on DImax via the microclimatic factor (PC = 0.841 and 0.862, respectively) exceeded that via the inoculum factor (PC = 0.705 and 0.130, respectively). However, the indirect effects led to DImax variation, while the dilution effect on host (CC = 0.154) from weed in wild plants led to the indirect effect size in wild plants of 0.200, which was lower than -0.699 in cultivated plants.
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Affiliation(s)
- P Gao
- 1 State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, P. R. China
- 2 College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi Province 030801, P. R. China
| | - Z B Nan
- 1 State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, P. R. China
- 3 Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, Lanzhou University
- 4 College of Pastoral Agricultural Science and Technology, Lanzhou University
| | - M J Christensen
- 1 State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, P. R. China
- 4 College of Pastoral Agricultural Science and Technology, Lanzhou University
| | - M J Barbetti
- 5 School of Agriculture and Environment and the UWA Institute of Agriculture, Faculty of Science, The University of Western Australia, Crawley, WA 6009, Australia; and
| | - T Y Duan
- 1 State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, P. R. China
- 3 Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, Lanzhou University
- 4 College of Pastoral Agricultural Science and Technology, Lanzhou University
| | - Q T Liu
- 6 Altay Gaubau Tea Co., Ltd., Altay 836500, P. R. China
| | - F J Meng
- 6 Altay Gaubau Tea Co., Ltd., Altay 836500, P. R. China
| | - J F Huang
- 6 Altay Gaubau Tea Co., Ltd., Altay 836500, P. R. China
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10
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Javed S, Ahsan W. Microemulsion based chromatographic techniques: Past lessons and future directions. J LIQ CHROMATOGR R T 2019. [DOI: 10.1080/10826076.2019.1584746] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Shamama Javed
- Department of Pharmaceutics, College of Pharmacy, Jazan University, Jazan, Saudi Arabia
| | - Waquar Ahsan
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jazan University, Jazan, Saudi Arabia
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11
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Pankajkumar-Patel N, Peris-García E, Ruiz-Angel MJ, Carda-Broch S, García-Alvarez-Coque MC. Modulation of retention and selectivity in oil-in-water microemulsion liquid chromatography: A review. J Chromatogr A 2019; 1592:91-100. [PMID: 30704775 DOI: 10.1016/j.chroma.2019.01.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 01/13/2019] [Accepted: 01/17/2019] [Indexed: 02/07/2023]
Abstract
Microemulsions (MEs) are stable, isotropically clear solutions consisting of an oil and water stabilized by a surfactant and a co-surfactant. Oil-in-water microemuslion liquid chromatography (MELC) is a relatively new chromatographic mode, which uses an O/W ME as mobile phase. Retention, selectivity and efficiency can be modified by changing the concentration of the ME components and the ratio between the aqueous and oil phases. This work makes a critical survey on the information found in the literature about the mobile phase compositions that lead to the creation of successful O/W ME mobile phases, as well as the effect of pH for ionizable compounds and temperature. The viability of performing the analyses using isocratic and gradient elution is also considered. The complexity of the composition of a successful ME, and the fact that the different factors interact each other, may require many manipulations during method development to achieve an acceptable separation for complex mixtures. This is the reason of the proposal from several authors of a standard ME as starting point when developing a method for a new separation with no previous reports. Based on these initial conditions, the interest of several authors in applying computer-assisted approaches to optimize the composition of ME mobile phases, and reduce significantly the time and reagent consumption for method development, is described. Some practical tips are given to prepare stable ME mobile phases that yield reproducible results.
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Affiliation(s)
- N Pankajkumar-Patel
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain
| | - E Peris-García
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain
| | - M J Ruiz-Angel
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain
| | - S Carda-Broch
- Department of Physical and Analytical Chemistry, University Jaume I, Av. Sos Baynat s/n, Castelló, Spain
| | - M C García-Alvarez-Coque
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot, Spain.
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Peris-García E, Pankajkumar-Patel N, Ruiz-Angel MJ, Carda-Broch S, García-Alvarez-Coque MC. Oil-In-Water Microemulsion Liquid Chromatography. SEPARATION AND PURIFICATION REVIEWS 2018. [DOI: 10.1080/15422119.2018.1524386] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Ester Peris-García
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot Spain
| | - Nikita Pankajkumar-Patel
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot Spain
| | - María José Ruiz-Angel
- Department of Analytical Chemistry, University of Valencia, Dr. Moliner 50, 46100 Burjassot Spain
| | - Samuel Carda-Broch
- Departament de Química Física i Analítica, Universitat Jaume I, Av. Sos Baynat s/n, Castelló Spain
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13
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Mathew S, Al Thani AA, Yassine HM. Computational screening of known broad-spectrum antiviral small organic molecules for potential influenza HA stem inhibitors. PLoS One 2018; 13:e0203148. [PMID: 30180218 PMCID: PMC6122827 DOI: 10.1371/journal.pone.0203148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Accepted: 08/15/2018] [Indexed: 12/26/2022] Open
Abstract
Background With the emergence of new influenza virus strains that are resistant to current inhibitors such as oseltamivir (anti-neuraminidase (NA)) and amantadine (anti-M2 proton channel), influenza A viruses continue to be a serious threat to the public health worldwide. With this in view, there is a persistent need for the development of broader and more effective vaccines and therapeutics. Identification of broadly neutralizing antibodies (bNAbs) that recognize relatively invariant structures on influenza haemagglutinin (HA) stem has invigorated efforts to develop universal influenza vaccines. Aim The current computational study is designed to identify potential flavonoid inhibitors that bind to the contact epitopes of HA stem that are targeted by broadly neutralizing antibodies (bNAb). Method In this study, we utilized the three-dimensional crystallographic structure of different HA subtypes (H1, H2, H5, H3, and H7) in complex with bNAb to screen for potential broadly reactive influenza inhibitors. We performed Quantitative Structure-Activity and Relationship (QSAR) for 100 natural compounds known for their antiviral activity and performed molecular docking using AutoDock 4.2 suite. Furthermore, we conducted virtual screening of 1413 bioassay hit compounds by using virtual lab bench CLC Drug Discovery. Results The results showed 18 lead flavonoids with strong binding abilities to bNAb epitopes of various HA subtypes. These 18 broadly reactive compounds exhibited significant interactions with an average of seven Hbonds, docking energy of -22.43 kcal·mol−1, and minimum interaction energy of -4.65 kcal·mol−1, with functional contact residues. Procyanidin depicted strong interactions with group 1 HAs, whereas both sorbitol and procyanidin exhibited significant interactions with group 2 HAs. Conclusion Using in silico docking analysis, we identified 18 bioactive flavonoids with potential strong binding cababilities to influenza HA-stems of various subtypes, which are the target for bNAb. The virtual screened bioassay hit compounds depicted a high number of Hbonds but low interaction and docking values compared to antiviral flavonoids. Using structure-based design and nanotechnology-based approaches, identified molecules could be modified to generate next generation anti-influenza drugs.
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Affiliation(s)
- Shilu Mathew
- Biomedical Research Center, Qatar University, Doha, Qatar
| | - Asmaa A. Al Thani
- Biomedical Research Center, Qatar University, Doha, Qatar
- College of Health Sciences, Qatar University, Doha, Qatar
| | - Hadi M. Yassine
- Biomedical Research Center, Qatar University, Doha, Qatar
- College of Health Sciences, Qatar University, Doha, Qatar
- * E-mail:
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14
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Apocynum venetum Leaf Extract Exerts Antidepressant-Like Effects and Inhibits Hippocampal and Cortical Apoptosis of Rats Exposed to Chronic Unpredictable Mild Stress. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2018; 2018:5916451. [PMID: 29576796 PMCID: PMC5822797 DOI: 10.1155/2018/5916451] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Accepted: 12/03/2017] [Indexed: 11/18/2022]
Abstract
We investigated the effects of Apocynum venetum leaf extract (AVLE) on depressive behaviors and neuronal apoptosis in a chronic unpredictable mild stress (CUMS) rat model of depression. Rats were randomly divided into six groups: control, chronic unpredictable mild stress, fluoxetine, AVLE30, AVLE60, and AVLE120. Except for the control group, all rats were submitted to chronic unpredictable mild stress paradigms for four weeks to induce depressive behavior. Neuronal apoptosis was assessed by the terminal deoxynucleotidyl transferase- (TDT-) mediated dUTP-biotin nick end-labeling (TUNEL) method. The expression levels of apoptosis-related proteins, such as B-cell lymphoma 2 (Bcl-2), Bcl-2 Associated X Protein (Bax), cysteine-aspartic acid protease-3 and protease-9 (caspase-3 and caspase-9), cytochrome c (cyt-C), brain-derived neurotrophic factor (BDNF), and cAMP-response element binding (CREB) protein, were evaluated by western blot. Treatment with AVLE (60 or 120 mg/kg/day) significantly improved depressive behavior. Increased apoptosis of hippocampus and cortical neurons were observed in CUMS rats, while 120 mg/kg/day of AVLE significantly reversed these changes and achieved the best antidepressant-like effects among the doses tested. Moreover, AVLE (120 mg/kg) significantly increased Bcl-2, BDNF, and CREB protein expression and decreased Bax, cyt-C, and caspase family protein expression. Our results indicate that AVLE has potent antidepressant activity, likely due to its ability to suppress neuronal apoptosis.
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Shetty SS, Koyama Y. One-pot synthesis of glycyrrhetic acid polyglycosides based on grafting-from method using cyclic sulfite. Tetrahedron Lett 2016; 57:3657-3661. [PMID: 32287447 PMCID: PMC7111874 DOI: 10.1016/j.tetlet.2016.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 06/27/2016] [Accepted: 07/01/2016] [Indexed: 12/02/2022]
Abstract
Glycyrrhetic acid polyglycosides were synthesized in one-pot via cationic ring-opening condensation polymerization of cyclic sulfite (4) initiated by glycyrrhetic acid as an aglycon. Sulfite 4 worked as a practical monomer for the preparation of (1 → 2)-linked polysaccharide skeletons. The chemical stability of 4 was evaluated by the comparison of thermodynamic parameters with those of conventional epoxide (2). The grafting reaction of 4 from glycyrrhetic acid (5) was performed in the presence of TfOH and MS 3A in CH2Cl2 at room temperature. The polymerization degree was moderately controllable by the change of feed ratio of initiator.
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Affiliation(s)
- Sangeetha S Shetty
- Institute for Catalysis, Hokkaido University, N21 W10, Kita-ku, Sapporo 001-0021, Japan
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Yasuhito Koyama
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
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Pirogov A, Sokolova L, Sokerina E, Tataurova O, Shpigun O. Determination of flavonoids as complexes with Al3+ in microemulsion media by HPLC method with fluorescence detection. J LIQ CHROMATOGR R T 2016. [DOI: 10.1080/10826076.2016.1147462] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Andrey Pirogov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Lidia Sokolova
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Ekaterina Sokerina
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Olga Tataurova
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | - Oleg Shpigun
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
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