1
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Salman F, Zengin A, Çelik Kazici H. Simple detection of gluten in commercial gluten-containing samples with a novel nanoflower electrosensor made of molybdenum disulfide with comparison of the ELISA method. J Food Sci 2024; 89:2747-2760. [PMID: 38563096 DOI: 10.1111/1750-3841.17043] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/17/2024] [Accepted: 03/06/2024] [Indexed: 04/04/2024]
Abstract
In this study, a new electrochemical sensor based on molybdenum disulfide (MoS2) nanoflowers/glassy carbon electrode (GCE was created for the sensitive detection of gluten. The prepared nanocatalysts were characterized using scanning electron microscopy with energy dispersive spectroscopy, x-ray diffraction, and x-ray photoelectron spectroscopy. The effects of the prepared nanocatalysts, pH value, and dropping amounts on the results were examined in detail. The electrochemical performance of the developed sensor (MoS2 nanoflowers/GCE) was then evaluated using differential pulse voltammetry, and the sensor was found to have significant electrochemical activity against gluten. A substantial linear connection was observed in the range of 0.5-100 ppm of gluten concentration under optimum experimental circumstances, and the detection limit between peak current and gluten concentration was determined as 1.16 ppm. The findings showed that the MoS2 nanoflowers/GCE gluten sensor has exceptional selectivity and stability. Finally, the generated electrochemical sensor was effectively utilized for gluten detection in commercial gluten-containing materials with a detection limit of 0.1652 ppm. Thus, the developed MoS2 nanoflowers/GCE sensor offers a potential method for the detection of other molecules and is a promising candidate for gluten detection in commercial samples.
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Affiliation(s)
- Fırat Salman
- Department of Chemical Engineering, Faculty of Engineering, Van Yüzüncü Yıl University, Van, Turkey
| | - Adem Zengin
- Department of Chemistry, Faculty of Science, Van Yüzüncü Yıl University, Van, Turkey
| | - Hilal Çelik Kazici
- Department of Chemistry, Faculty of Science, Van Yüzüncü Yıl University, Van, Turkey
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2
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Ding Y, Zengin A, Cheng W, Wang L, Ettelaie R. Emulsifying properties of plant-derived polypeptide and their conjugates: a self-consistent-field calculation study of the impact of hydrolysis. Soft Matter 2023; 19:7443-7458. [PMID: 37747041 DOI: 10.1039/d3sm00855j] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
By considering the hydrolysates of soy protein produced by trypsin as an example, the emulsion stabilizing properties of plant-based protein fragments have been investigated theoretically. We apply Self-Consistent-Field (SCF) calculations to determine the colloidal interactions induced between a pair of droplets stabilized by adsorbed layers of various soy protein fragments. The study is extended to conjugates of such polypeptides, formed by covalent bonding with a suitable hydrophilic sidechain (e.g. a polysaccharide). Our results show that the relatively longer fragments, with a greater number of hydrophobic amino acids, will display a stronger degree of adsorption affinity compared to the smaller hydrolysates, even where the latter may have a higher overall ratio of hydrophobic residues. This suggested that the degree of protein hydrolysis should be carefully controlled and limited to modest values to avoid the generation of a large number of short polypeptides, while still sufficient to improve solubility. While the emulsion stabilizing performance of a protein fragment type is strongly dependent on the conformation it adopts on the interface, we find this to be less critical for the conjugated polypeptides. However, we argue that with increasing degree of hydrolysis, many small fragments will not have the chance to form bonds with polysaccharides. It is demonstrated that the abundance of these unreacted polypeptides in the system severely reduces the efficiency of the conjugated longer protein fragments, preventing their presence on the surface of the droplets through competitive adsorption process.
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Affiliation(s)
- Yue Ding
- College of Food and Bioengineering, International Joint Laboratory of Food Processing and Quality Safety Control of Henan Province, Henan University of Science and Technology, Luoyang 471000, P. R. China.
- Food Colloids Group, School of Food Science and Nutrition, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.
| | - Adem Zengin
- Department of Food Engineering, Faculty of Engineering, Sakarya University, Serdivan Sakarya, Turkey
| | - Weiwei Cheng
- College of Food and Bioengineering, International Joint Laboratory of Food Processing and Quality Safety Control of Henan Province, Henan University of Science and Technology, Luoyang 471000, P. R. China.
| | - Libo Wang
- College of Food and Bioengineering, International Joint Laboratory of Food Processing and Quality Safety Control of Henan Province, Henan University of Science and Technology, Luoyang 471000, P. R. China.
| | - Rammile Ettelaie
- Food Colloids Group, School of Food Science and Nutrition, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.
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3
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Güler M, Zengin A, Alay M. Fabrication of glucose bioelectrochemical sensor based on Au@Pd core-shell supported by carboxylated graphene oxide. Anal Biochem 2023; 667:115091. [PMID: 36863551 DOI: 10.1016/j.ab.2023.115091] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 12/23/2022] [Revised: 02/20/2023] [Accepted: 02/24/2023] [Indexed: 03/04/2023]
Abstract
The study presents a novel electrochemical glucose biosensor based on glucose oxidase (GOx) immobilized on Au@Pd core-shell nanoparticles supported on carboxylated graphene oxide (cGO). The immobilization of GOx was achieved by cross-linking the chitosan biopolymer (CS) including Au@Pd/cGO and glutaraldehyde (GA) on a glassy carbon electrode. The analytical performance of GCE/Au@Pd/cGO-CS/GA/GOx was investigated using amperometry. The biosensor had fast response time (5.2 ± 0.9 s), a satisfactory linear determination range between 2.0 × 10-5 and 4.2 × 10-3 M, and limit of detection of 10.4 μM. The apparent Michaelis-Menten constant (Kapp) was calculated as 3.04 mM. The fabricated biosensor also exhibited good repeatability, reproducibility, and storage stability. No interfering signals from dopamine, uric acid, ascorbic acid, paracetamol, folic acid, mannose, sucrose, and fructose were observed. The large electroactive surface area of carboxylated graphene oxide is a promising candidate for sensor preparation.
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Affiliation(s)
- Muhammet Güler
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, 65080, Van, Turkey.
| | - Adem Zengin
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, 65080, Van, Turkey.
| | - Murat Alay
- Faculty of Medicine, Department of Endocrinology and Metabolism Van Yuzuncu Yil University, 65080, Van, Turkey
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4
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Ecer Ü, Şahan T, Zengin A, Gubbuk İH. Decolorization of Rhodamine B by silver nanoparticle-loaded magnetic sporopollenin: characterization and process optimization. Environ Sci Pollut Res Int 2022; 29:79375-79387. [PMID: 35710967 DOI: 10.1007/s11356-022-21416-2] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
Silver nanoparticles (Ag NPs) were reduced on the surface of magnetic sporopollenin (Fe3O4@SP) modified with poly-dopamine to enhance the degradation capability for Rhodamine B (RhB). The polydopamine-coated Fe3O4@SP (PDA@ Fe3O4@SP) acts as a self-reducing agent for Ag+ ions to Ag0. The structural properties of the synthesized nanocomposite were determined using Fourier transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and vibrating sample magnetometer (VSM). The systematic study of the degradation process was performed using Response Surface Methodology (RSM) to determine the relationship between the four process variables, namely, initial RhB concentration, NaBH4 amount, catalyst amount, and time. Optimum points were determined for these four parameters using both matrix and numerical optimization methods. Under optimum conditions, RhB was decolorized with a yield of 98.11%. The apparent activation energy (Ea) and rate constant (k) for the degradation were 24.13 kJ/mol and 0.77 min-1, respectively. The reusability studies of the Ag@PDA@Fe3O4@SP exhibited more than 85% degradation ability of the dye even after five cycles. As a result, Ag@PDA@Fe3O4@SP possessed high catalytic activity, fast reduction rate, good reusability, easy separation, and simple preparation, endowing this catalyst to be used as a promising catalyst for the decolorization of dyes in aqueous solutions.
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Affiliation(s)
- Ümit Ecer
- Department of Chemical Engineering, Institute of Natural and Applied Sciences, Van Yuzuncu Yil University, Van, 65080, Turkey
| | - Tekin Şahan
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, 65080, Van, Turkey.
| | - Adem Zengin
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, 65080, Van, Turkey.
| | - İlkay Hilal Gubbuk
- Faculty of Science, Department of Chemistry, Selcuk University, 42075, Konya, Turkey
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5
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Turan E, Zengin A, Suludere Z, Kalkan NÖ, Tamer U. Construction of a sensitive and selective plasmonic biosensor for prostate specific antigen by combining magnetic molecularly-imprinted polymer and surface-enhanced Raman spectroscopy. Talanta 2022; 237:122926. [PMID: 34736663 DOI: 10.1016/j.talanta.2021.122926] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/20/2021] [Accepted: 10/02/2021] [Indexed: 11/18/2022]
Abstract
Selective and sensitive detection of cancer biomarkers in serum samples is critical for early diagnosis of cancer. Prostate specific antigen is an important biomarker of prostate cancer, which ranks high among cancer-related deaths of men over 50 years old. Herein, a novel analytical method was introduced for detection of PSA by combining high selectivity of molecularly-imprinted polymers and high sensitivity of surface-enhanced Raman spectroscopy (SERS). Firstly, magnetic nanoparticles were grafted with an imprinted layer by using tannic acid as a functional monomer, diethylenetriamine as a cross-linker and prostate specific antigen as a template molecule. Detailed surface characterization and re-binding experiment results indicated that the imprinting of the antigen was successful with an imprinting factor of 5.58. The prepared magnetic molecularly imprinted polymers (MMIPs) were used as an antibody-free capture probe and labeled with gold nanoparticles that were modified with anti-PSA and a Raman reporter, namely 5,5'-dithiobis-(2-nitrobenzoic acid). Thus, a plasmonic structure (sandwich complex) was formed between MMIP and the SERS label. The limit of detection and limit of quantification of the designed sensor were 0.9 pg/mL and 3.2 pg/mL, respectively. The sensor also showed high recovery rates (98.0-100.1% for healthy person and 99.0-101.3% for patient) with low standard deviations (less than 4.3% for healthy person and less than 3.3% for patient) for PSA in serum samples. Compared with the traditional immunoassays, the proposed method has several advantages like low cost, reduced detection procedure, fast response, high sensitivity and selectivity. It is believed that the proposed method can be potentially used for selective and sensitive determination of tumor marker of prostate cancer in clinical applications.
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Affiliation(s)
- Eylem Turan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara Medipol University, 06050, Ankara, Turkey
| | - Adem Zengin
- Department of Chemistry, Faculty of Science, Van Yuzuncu Yil University, 65080, Van, Turkey.
| | - Zekiye Suludere
- Department of Biology, Faculty of Science, Gazi University, 06500, Ankara, Turkey
| | - Nurhan Önal Kalkan
- Department of Medical Oncology, Faculty of Medicine, Van Yuzuncu Yil University, 65080, Van, Turkey
| | - Uğur Tamer
- Department of Analytical Chemistry, Faculty of Pharmacy, Gazi University, 06500, Ankara, Turkey
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6
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Ahi EE, Torul H, Zengin A, Sucularlı F, Yıldırım E, Selbes Y, Suludere Z, Tamer U. A capillary driven microfluidic chip for SERS based hCG detection. Biosens Bioelectron 2022; 195:113660. [PMID: 34592500 DOI: 10.1016/j.bios.2021.113660] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 08/10/2021] [Accepted: 09/20/2021] [Indexed: 02/06/2023]
Abstract
In this study, a capillary driven microfluidic chip-based immunoassay was developed for the determination of Human Chorionic Gonadotropin (hCG) protein, which is prohibited by the World Anti-Doping Agency (WADA). Here, we used antibody modified magnetic metal organic framework nanoparticles (MMOFs) as a capture prob in urine sample. MMOF captured hCG was transferred in a capillary driven microfluidic chip consisting of four chambers, and the interaction of MMOF with gold nanorods labelled with 5,5'-Dithiobis-(2-nitrobenzoic acid) (DTNB) as a Raman label was carried out in the capillary driven microfluidic chip. The movement of MMOF through first chamber to the last chamber was achieved with a simple magnet. In the last chamber of capillary driven microfluidic chip, SERS signals of DTNB molecules from the sandwich complex were recorded using a Raman spectrophotometer. The selectivity of the developed method was demonstrated by applying the same procedure for the detection of Human Luteinizing Hormone (hLH), Human Chorionic Gonadotropin Hormone (hGH) and Immunoglobulin G (IgG) protein. The regression coefficient and limit of detection obtained from the standard addition method were found as 0,9985 and 0,61 IU/L, respectively. Furthermore, the conventional ELISA method confirmed that the results obtained by the presented method were acceptable with the similarity of 97.9% in terms of average recovery value, for the detection of hCG in urine samples. The analysis system developed for target proteins will be an alternative technique such as Western Blot used in routine analysis that is expensive and time consuming.
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Affiliation(s)
- Elçin Ezgi Ahi
- Gebze Technical University, Faculty of Science, Department of Chemistry, 41400, Kocaeli, Turkey
| | - Hilal Torul
- Gazi University, Faculty of Pharmacy, Department of Analytical Chemistry, 06330, Ankara, Turkey
| | - Adem Zengin
- Van Yüzüncü Yıl University, Faculty of Science, Department of Chemistry, 65080, Van, Turkey
| | - Ferah Sucularlı
- Aselsan A.Ş., Radar, Electronic Warfare Systems Business Sector, 06200, Ankara, Turkey
| | - Ender Yıldırım
- Department of Mechanical Engineering, Faculty of Engineering, Middle East Technical University, 06800, Ankara, Turkey
| | - Yeşim Selbes
- Hacettepe University, Doping Control Center, 06100, Ankara, Turkey
| | - Zekiye Suludere
- Gazi University, Faculty of Science, Department of Biology, 06500, Ankara, Turkey
| | - Uğur Tamer
- Gazi University, Faculty of Pharmacy, Department of Analytical Chemistry, 06330, Ankara, Turkey.
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7
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Ecer Ü, Zengin A, Şahan T. Magnetic clay\zeolitic imidazole framework nanocomposite (ZIF-8@Fe3O4@BNT) for reactive orange 16 removal from liquid media. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127558] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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8
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Yılmaz Ş, Zengin A, Şahan T. Bentonite grafted with poly(N-acryloylglycineamide) brush: A novel clay-polymer brush hybrid material for the effective removal of Hg(II) and As(V) from aqueous environments. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125979] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Meydan İ, Bilici M, Turan E, Zengin A. Selective Extraction and Determination of Citrinin in Rye Samples by a Molecularly Imprinted Polymer (MIP) Using Reversible Addition Fragmentation Chain Transfer Precipitation Polymerization (RAFTPP) with High-Performance Liquid Chromatography (HPLC) Detection. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.1892125] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- İsmet Meydan
- Health Services Vocational High School, Van Yuzuncu Yil University, Van, Turkey
| | - Mustafa Bilici
- Faculty of Medicine, Department of Basic Medical Sciences, Van Yuzuncu Yil University, Van, Turkey
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, Van, Turkey
| | - Eylem Turan
- Faculty of Pharmacy, Department of Analytical Chemistry, Ankara Medipol University, Ankara, Turkey
| | - Adem Zengin
- Faculty of Science, Department of Chemistry, Van Yuzuncu Yil University, Van, Turkey
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10
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Zengin A, Castro JPO, Habibovic P, van Rijt SH. Injectable, self-healing mesoporous silica nanocomposite hydrogels with improved mechanical properties. Nanoscale 2021; 13:1144-1154. [PMID: 33400753 PMCID: PMC8100892 DOI: 10.1039/d0nr07406c] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 12/18/2020] [Indexed: 05/08/2023]
Abstract
Self-healing hydrogels have emerged as promising biomaterials in regenerative medicine applications. However, an ongoing challenge is to create hydrogels that combine rapid self-healing with high mechanical strength to make them applicable to a wider range of organs/tissues. Incorporating nanoparticles within hydrogels is a popular strategy to improve the mechanical properties as well as to provide additional functionalities such as stimuli responsiveness or controlled drug delivery, further optimizing their use. In this context, mesoporous silica nanoparticles (MSNs) are promising candidates as they are bioactive, improve mechanical properties, and can controllably release various types of cargo. While commonly nanoparticles are added to hydrogels as filler component, in the current study we developed thiol surface-functionalized MSNs capable of acting as chemical crosslinkers with a known hydrophilic polymer, polyethylene glycol (PEG), through dynamic thiol-disulfide covalent interactions. Due to these dynamic exchange reactions, mechanically strong nanocomposites with a storage modulus of up to 32 ± 5 kPa compared to 1.3 ± 0.3 kPa for PEG hydrogels alone, with rapid self-healing capabilities, could be formed. When non-surface modified MSNs were used, the increase in storage modulus of the hydrogels was significantly lower (3.4 ± 0.7 kPa). In addition, the nanocomposites were shown to degrade slowly over 6 weeks upon exposure to glutathione while remaining intact at physiological conditions. Together, the data argue that creating nanocomposites using MSNs as dynamic crosslinkers is a promising strategy to confer mechanical strength and rapid self-healing capabilities to hydrogels. This approach offers new possibilities for creating multifunctional self-healing biomaterials for a wider range of applications in regenerative medicine.
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Affiliation(s)
- A Zengin
- Department of Instructive Biomaterials Engineering (IBE), MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, the Netherlands.
| | - J P O Castro
- Department of Instructive Biomaterials Engineering (IBE), MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, the Netherlands.
| | - P Habibovic
- Department of Instructive Biomaterials Engineering (IBE), MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, the Netherlands.
| | - S H van Rijt
- Department of Instructive Biomaterials Engineering (IBE), MERLN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, the Netherlands.
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11
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Panhwar S, Ilhan H, Hassan SS, Zengin A, Boyacı IH, Tamer U. Dual Responsive Disposable Electrode for the Enumeration of
Escherichia coli
in Whole Blood. ELECTROANAL 2020. [DOI: 10.1002/elan.202060185] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Sallahuddin Panhwar
- Department of Analytical Chemistry Faculty of Pharmacy Gazi University, Etiler 06330 Ankara Turkey
- U.S.-Pakistan Center for Advanced Studies in Water (US-PCAS-W) Mehran University of Engineering and Technology, Jamshoro 76062 Sindh Pakistan
| | - Hasan Ilhan
- Department of Chemistry Faculty of Science Ordu University, Altinordu 52200 Ordu Turkey
| | - Syeda Sara Hassan
- U.S.-Pakistan Center for Advanced Studies in Water (US-PCAS-W) Mehran University of Engineering and Technology, Jamshoro 76062 Sindh Pakistan
| | - Adem Zengin
- Van Yüzüncü Yil University Department of Chemical Engineering 65090 Tuşba/Van Turkey
| | - Ismail Hakkı Boyacı
- Department of Food Engineering Faculty of Engineering Hacettepe University, Beytepe 06800 Ankara Turkey
| | - Ugur Tamer
- Department of Analytical Chemistry Faculty of Pharmacy Gazi University, Etiler 06330 Ankara Turkey
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12
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Bilici M, Badak MU, Zengin A, Suludere Z, Aktas N. Synthesis of magnetic halloysite nanotube-based molecularly imprinted polymers for sensitive spectrophotometric detection of metoclopramide in urine samples. Materials Science and Engineering: C 2020; 106:110223. [DOI: 10.1016/j.msec.2019.110223] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/02/2019] [Accepted: 09/17/2019] [Indexed: 01/31/2023]
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13
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Yılmaz Ş, Zengin A, Ecer Ü, Şahan T. Conversion from a natural mineral to a novel effective adsorbent: Utilization of pumice grafted with polymer brush for methylene blue decolorization from aqueous environments. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123961] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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14
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Yılmaz Ş, Zengin A, Akbulut Y, Şahan T. Magnetic nanoparticles coated with aminated polymer brush as a novel material for effective removal of Pb(II) ions from aqueous environments. Environ Sci Pollut Res Int 2019; 26:20454-20468. [PMID: 31102228 DOI: 10.1007/s11356-019-05360-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
In the present study, a poly (vinylbenzyl chloride) grafted Fe3O4 nanoparticle (Fe3O4@PVBC) was prepared by surface-initiated reversible addition fragmentation chain transfer (SI-RAFT) polymerization and subsequently coated with tris (aminoethyl) amine (TAEA). Then, Fe3O4@PVBC-TAEA nanoparticles were utilized as a novel adsorbent for removal of Pb(II) from aqueous media and optimal adsorption conditions were determined with response surface methodology (RSM). The used adsorbent was characterized by using X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and vibrating sample magnetometer (VSM). RSM with central composite design (CCD) was carried out to evaluate the effect of initial pH, initial Pb(II) concentration (C0, mg/L), adsorbent dosage (mg), and contact time (min). The optimum initial pH, C0, adsorbent dosage, and contact time were found to be 5.88, 46.51 mg/L, 17.41 mg, and 108.21 min, respectively. The maximum removal efficiency and adsorption capacity were 97.07% and 129.65 mg/g under these conditions, respectively. The kinetic data revealed that the adsorption mechanism could be best explained by the pseudo-second-order and Weber-Morris models. The isotherm studies found that both the Langmuir and Freundlich isotherm models fitted the experimental data well. The thermodynamic analysis indicated that the adsorption nature is exothermic, applicable, and spontaneous.
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Affiliation(s)
- Şakir Yılmaz
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, 65080, Van, Turkey
| | - Adem Zengin
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, 65080, Van, Turkey
| | - Yeliz Akbulut
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, 65080, Van, Turkey
| | - Tekin Şahan
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, 65080, Van, Turkey.
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15
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Zengin A, Badak MU, Aktas N. Selective separation and determination of quercetin from red wine by molecularly imprinted nanoparticles coupled with HPLC and ultraviolet detection. J Sep Sci 2018; 41:3459-3466. [DOI: 10.1002/jssc.201800437] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 07/04/2018] [Accepted: 07/05/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Adem Zengin
- Department of Chemical Engineering; Faculty of Engineering; Van Yuzuncu Yil University; Van Turkey
| | - M. Utku Badak
- Department of Chemical Engineering; Faculty of Engineering; Van Yuzuncu Yil University; Van Turkey
| | - Nahit Aktas
- Department of Chemical Engineering; Faculty of Engineering; Van Yuzuncu Yil University; Van Turkey
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16
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Bilici M, Zengin A, Ekmen E, Cetin D, Aktas N. Efficient and selective separation of metronidazole from human serum by using molecularly imprinted magnetic nanoparticles. J Sep Sci 2018; 41:2952-2960. [PMID: 29813175 DOI: 10.1002/jssc.201800428] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 04/19/2018] [Revised: 05/14/2018] [Accepted: 05/16/2018] [Indexed: 01/24/2023]
Abstract
Magnetic molecularly imprinted nanoparticles were prepared through surface-initiated reversible addition fragmentation chain transfer polymerization by using metronidazole as a template. The molecularly imprinted magnetic nanoparticles were characterized by attenuated total reflection Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, X-ray diffraction, and vibrating sample magnetometry. The adsorption characteristics were also investigated and the kinetics of the adsorption of metronidazole on the imprinted nanoparticles were described by the second-order kinetic model with the short equilibrium adsorption time (30 min). The adsorption isotherm was well matched with the Langmuir isotherm in which the maximum adsorption capacity was calculated to be 40.1 mg/g. Furthermore, the imprinted magnetic nanoparticles showed good selectivity as well as reusability even after six adsorption-desorption cycles. The imprinted magnetic nanoparticles were used as a sorbent for the selective separation of metronidazole from human serum. The recoveries of metronidazole from human serum changed between 97.5 and 99.8% and showed similar sensitivity as an enzyme-linked immunoassay method. Therefore, the molecularly imprinted magnetic nanoparticles might have potential application for the selective and reliable separation of metronidazole from biological fluids in clinical applications.
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Affiliation(s)
- Mustafa Bilici
- Department of Chemistry, Faculty of Science and Arts, Van Yuzuncu Yil University, Van, Turkey
| | - Adem Zengin
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, Van, Turkey
| | - Elvan Ekmen
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, Van, Turkey
| | - Demet Cetin
- Department of Mathematics and Science Education, Gazi Faculty of Education, Gazi University, Ankara, Turkey
| | - Nahit Aktas
- Department of Chemical Engineering, Faculty of Engineering, Van Yuzuncu Yil University, Van, Turkey
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Zengin A, Caykara T. A novel route to prepare a multilayer system via the combination of interface-mediated catalytic chain transfer polymerization and thiol-ene click chemistry. Mater Sci Eng C Mater Biol Appl 2017; 74:103-109. [PMID: 28254273 DOI: 10.1016/j.msec.2017.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 09/09/2016] [Accepted: 02/06/2017] [Indexed: 11/29/2022]
Abstract
Herein, we have designed a novel multilayer system composed of poly(methyl methacrylate) [poly(MMA)] brush, biotin, streptavidin and protein-A on a silicon substrate to attach onanti-immunoglobulin G (anti-IgG). poly(MMA) brush with vinyl end-group was first synthesized by the interface-mediated catalytic chain transfer polymerization. The brush was then modified with cysteamine molecules to generate the polymer chains with amine end-group via a thiol-ene click chemistry. The amine end-groups of poly(MMA) chains were also modified with biotin units to ensure selective connection points for streptavidin molecules. Finally, a multilayer system on the silicon substrate was formed by using streptavidin and protein-A molecules, respectively. This multilayer system was employed to attach anti-IgG molecules in a highly oriented manner and provide anti-IgG molecular functional configuration on the multilayer. High reproducibility of the amount of anti-IgG adsorption and homogeneous anti-IgG adsorption layer on the silicon surface could be provided by this multilayer system. The multilayer system with protein A may be opened the door for designing an efficient immunoassay protein chip.
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Affiliation(s)
- Adem Zengin
- Department of Chemical Engineering, Faculty of Engineering and Architecture, Yuzuncu Yil University, TR-65080 Van, Turkey
| | - Tuncer Caykara
- Department of Chemistry, Faculty of Science, Gazi University, 06500 Besevler, Ankara, Turkey.
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18
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Duzgun SA, Bayhan Z, Zeren S, Zengin A. Comment to: "No enterocutaneous fistula development in a cohort of 695 patients after incisional hernia repair using intraperitoneal uncoated polypropylene mesh" by Brandi, C.D., Roche, S., Bertone, S. et al. Hernia (2017) 21: 101. Hernia 2017; 21:825-826. [PMID: 28417278 DOI: 10.1007/s10029-017-1616-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 04/07/2017] [Indexed: 10/19/2022]
Affiliation(s)
- S A Duzgun
- Department of Surgery, Jimer Hospital, Odunluk mh Mihraplı cd., Nilüfer, Bursa, Turkey.
| | - Z Bayhan
- Department of Surgery, School of Medicine, Dumlupinar University, Kütahya, Turkey
| | - S Zeren
- Department of Surgery, School of Medicine, Dumlupinar University, Kütahya, Turkey
| | - A Zengin
- Department of Surgery, School of Medicine, Dumlupinar University, Kütahya, Turkey
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20
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Zengin A, Pye SR, Cook MJ, Adams JE, Wu FCW, O'Neill TW, Ward KA. Ethnic differences in bone geometry between White, Black and South Asian men in the UK. Bone 2016; 91:180-5. [PMID: 27457689 PMCID: PMC5004623 DOI: 10.1016/j.bone.2016.07.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 07/14/2016] [Accepted: 07/21/2016] [Indexed: 12/21/2022]
Abstract
Relatively little is known about the bone health of ethnic groups within the UK and data are largely restricted to women. The aim of this study was to investigate ethnic differences in areal bone mineral density (aBMD), volumetric bone mineral density (vBMD), bone geometry and strength in UK men. White European, Black Afro-Caribbean and South Asian men aged over 40years were recruited from Greater Manchester, UK. aBMD at the spine, hip, femoral neck and whole body were measured by DXA. Bone geometry, strength and vBMD were measured at the radius and tibia using pQCT at the metaphysis (4%) and diaphysis (50% radius; 38% tibia) sites. Adjustments were made for age, weight and height. Black men had higher aBMD at the whole body, total hip and femoral neck compared to White and South Asian men independent of body size adjustments, with no differences between the latter two groups. White men had longer hip axis lengths than both Black and South Asian men. There were fewer differences in vBMD but White men had significantly lower cortical vBMD at the tibial diaphysis than Black and South Asian men (p<0.001). At the tibia and radius diaphysis, Black men had larger bones with thicker cortices and greater bending strength than the other groups. There were fewer differences between White and South Asian men. At the metaphysis, South Asian men had smaller bones (p=0.02) and lower trabecular vBMD at the tibia (p=0.003). At the diaphysis, after size-correction, South Asian men had similar sized bones but thinner cortices than White men; measures of strength were not broadly reduced in the South Asian men. Combining pQCT and DXA measurements has given insight into differences in bone phenotype in men from different ethnic backgrounds. Understanding such differences is important in understanding the aetiology of male osteoporosis.
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Affiliation(s)
- A Zengin
- Medical Research Council Human Nutrition Research, Cambridge, UK.
| | - S R Pye
- Arthritis Research UK Centre for Epidemiology, Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK
| | - M J Cook
- Arthritis Research UK Centre for Epidemiology, Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK
| | - J E Adams
- Radiology and Manchester Academic Health Science Centre (MAHSC), Manchester Royal Infirmary, Central Manchester University Hospitals NHS Foundation Trust and University of Manchester, Manchester, UK
| | - F C W Wu
- Andrology Research Unit, Manchester Academic Health Science Centre (MAHSC), The University of Manchester, Manchester, UK
| | - T W O'Neill
- Arthritis Research UK Centre for Epidemiology, Centre for Musculoskeletal Research, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK; NIHR Manchester Musculoskeletal Biomedical Research Unit, Central Manchester NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK; Department of Rheumatology, Salford Royal NHS Foundation Trust, Salford, UK
| | - K A Ward
- Medical Research Council Human Nutrition Research, Cambridge, UK; MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK.
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Karaca M, Tatlisu MA, Ozcan KS, Gungor B, Bozbeyoglu E, Yildirimturk O, Arugaslan E, Zengin A, Calik AN, Nurkalem Z, Cam N. Prognostic significance of fragmented QRS in acute pulmonary embolism. Acta Cardiol 2016; 71:443-8. [PMID: 27594360 DOI: 10.2143/ac.71.4.3159697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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22
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Yildirim E, Cimen D, Zengin A, Caykara T. Synthesis of poly(N-(2-hydroxypropyl) methacrylamide) brushes by interface-mediated RAFT polymerization. RSC Adv 2016. [DOI: 10.1039/c6ra04189b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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] Open
Abstract
A novel poly(N-(2-hydroxypropyl) methacrylamide) [poly(HPMA)] brush with a moderate density polymer brush (0.52 chains per nm2) was synthesized by an interface-mediated RAFT polymerization.
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Affiliation(s)
- Ertan Yildirim
- Department of Chemistry
- Faculty of Science
- Gazi University
- Ankara
- Turkey
| | - Dilek Cimen
- Department of Chemistry
- Faculty of Science
- Gazi University
- Ankara
- Turkey
| | - Adem Zengin
- Department of Chemical Engineering
- Faculty of Engineering
- Yuzuncu Yil University
- Van
- Turkey
| | - Tuncer Caykara
- Department of Chemistry
- Faculty of Science
- Gazi University
- Ankara
- Turkey
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23
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Rodoplu D, Boyaci I, Bozkurt A, Eksi H, Zengin A, Tamer U, Aydogan N, Özcan S, Tugcu-Demiröz F. Quantitative Characterization of Magnetic Mobility of Nanoparticle in Solution-Based Condition. Curr Pharm Des 2015; 21:5389-400. [DOI: 10.2174/1381612821666150917092327] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 09/16/2015] [Indexed: 11/22/2022]
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24
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Zengin A, Tamer U, Caykara T. A new plasmonic device made of gold nanoparticles and temperature responsive polymer brush on a silicon substrate. J Colloid Interface Sci 2015; 448:215-21. [DOI: 10.1016/j.jcis.2015.02.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 02/07/2015] [Accepted: 02/09/2015] [Indexed: 10/24/2022]
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Abstract
Poly(N-acryoyl-l-valine, AVAL) brushes were grafted onto a silicon substrateviaRAFT polymerization, and then ricin B aptamer was covalently conjugated to the poly(AVAL) brushes to recognize and detect ricin B toxinviaSERS-based sandwich assay.
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Affiliation(s)
- Adem Zengin
- Faculty of Science
- Department of Chemistry
- Gazi University
- Ankara
- Turkey
| | - Ugur Tamer
- Faculty of Pharmacy
- Department of Analytical Chemistry
- Gazi University
- Ankara
- Turkey
| | - Tuncer Caykara
- Faculty of Science
- Department of Chemistry
- Gazi University
- Ankara
- Turkey
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26
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Akyuz S, Zengin A, Arugaslan E, Yazici S, Onuk T, Ceylan US, Gungor B, Gurkan U, Kemaloglu Oz T, Kasikcioglu H, Cam N. Echo-guided pericardiocentesis in patients with clinically significant pericardial effusion. Outcomes over a 10-year period. Herz 2014; 40 Suppl 2:153-9. [PMID: 25491665 DOI: 10.1007/s00059-014-4187-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 11/06/2014] [Accepted: 11/07/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND The purpose of the present study is to evaluate current echocardiographically (echo)-guided pericardiocentesis practice with regard to procedural success, complication rate, etiological causes, and outcomes of patients with clinically significant pericardial effusion. PATIENTS AND METHODS Patients who underwent echo-guided pericardiocentesis between January 2004 and February 2014 were identified using an institutional code for the procedure. Other complementary data were obtained by interviewing patients or their relatives (directly or by telephone) and by searching the social security death index. RESULTS A total of 301 patients were identified. The pericardium was approached via the subcostal (85 %) or apical (15 %) route under echo guidance in all procedures. The success rate was 97 %, with an intervention-requiring complication rate of 1.3 %. No patient died from complications. The most common etiology was malignancy (n = 84, 28 %). Patients were followed-up for a median of 35 months. Median survival for patients with malignant effusion was 5.9 months compared with 54 months for those with nonmalignant effusion. CONCLUSIONS Echo-guided pericardiocentesis has a high success and low complication rate in current practice. Among etiologies, malignancy remains the most common cause of clinically significant pericardial effusion and is associated with a poor prognosis.
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Affiliation(s)
- S Akyuz
- Department of Cardiology, Siyami Ersek Thoracic and Cardiovascular Surgery Training and Research Hospital, Tibbiye cad. No:13, Istanbul, Turkey,
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27
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Baldock PA, Lin S, Zhang L, Karl T, Shi Y, Driessler F, Zengin A, Hörmer B, Lee NJ, Wong IPL, Lin EJD, Enriquez RF, Stehrer B, During MJ, Yulyaningsih E, Zolotukhin S, Ruohonen ST, Savontaus E, Sainsbury A, Herzog H. Neuropeptide y attenuates stress-induced bone loss through suppression of noradrenaline circuits. J Bone Miner Res 2014; 29:2238-49. [PMID: 24535841 DOI: 10.1002/jbmr.2205] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 02/09/2014] [Accepted: 02/12/2014] [Indexed: 12/23/2022]
Abstract
Chronic stress and depression have adverse consequences on many organ systems, including the skeleton, but the mechanisms underlying stress-induced bone loss remain unclear. Here we demonstrate that neuropeptide Y (NPY), centrally and peripherally, plays a critical role in protecting against stress-induced bone loss. Mice lacking the anxiolytic factor NPY exhibit more anxious behavior and elevated corticosterone levels. Additionally, following a 6-week restraint, or cold-stress protocol, Npy-null mice exhibit three-fold greater bone loss compared to wild-type mice, owing to suppression of osteoblast activity. This stress-protective NPY pathway acts specifically through Y2 receptors. Centrally, Y2 receptors suppress corticotropin-releasing factor expression and inhibit activation of noradrenergic neurons in the paraventricular nucleus. In the periphery, they act to control noradrenaline release from sympathetic neurons. Specific deletion of arcuate Y2 receptors recapitulates the Npy-null stress response, coincident with elevated serum noradrenaline. Importantly, specific reintroduction of NPY solely in noradrenergic neurons of otherwise Npy-null mice blocks the increase in circulating noradrenaline and the stress-induced bone loss. Thus, NPY protects against excessive stress-induced bone loss, through Y2 receptor-mediated modulation of central and peripheral noradrenergic neurons.
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Affiliation(s)
- P A Baldock
- Neurological Disease Division, Garvan Institute of Medical Research, St Vincent's Hospital, Sydney, Australia; Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, St Vincent's Hospital, Sydney, Australia; Faculty of Medicine, University of New South Wales, Sydney, Australia
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Tatlisu M, Ozcan K, Gungor B, Cekirdekci E, Ekmekçi A, Arugaslan E, Zengin A, Karaca M. Can the t-peak to t-end interval be a predictor of mortality in patients with st-elevation myocardial infarction? Atherosclerosis 2014. [DOI: 10.1016/j.atherosclerosis.2014.05.166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Ettelaie R, Zengin A, Lee H. Fragmented proteins as food emulsion stabilizers: A theoretical study. Biopolymers 2014; 101:945-58. [DOI: 10.1002/bip.22487] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 03/11/2014] [Accepted: 03/14/2014] [Indexed: 01/19/2023]
Affiliation(s)
- Rammile Ettelaie
- Food Colloids Group; School of Food Science and Nutrition, University of Leeds; Leeds LS2 9JT UK
| | - Adem Zengin
- Food Colloids Group; School of Food Science and Nutrition, University of Leeds; Leeds LS2 9JT UK
| | - Hazel Lee
- Food Colloids Group; School of Food Science and Nutrition, University of Leeds; Leeds LS2 9JT UK
- Food Innovation Department, Leatherhead Food Research; Randalls Road Leatherhead Surrey KT22 7RY UK
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30
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Zengin A, Bozkurt A, Boyaci IH, Özcan S, Daniel P, Lagarde F, Gibaud A, Cetin D, Suludere Z, Guttmann P, Tamer U. Anisotropic core-shell Fe3 O4 @Au magnetic nanoparticles and the effect of the immunomagnetic separation volume on the capture efficiency. PURE APPL CHEM 2014. [DOI: 10.1515/pac-2013-0915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe aim of this study was to synthesize in high product yield of anisotropic core-shell Fe3 O4@Au magnetic nanoparticles and to investigate the effect of the immunomagnetic separation (IMS) volume on the capture efficiency. For these purposes and for the first time, we synthesized polyhedral magnetic nanoparticles composed of Fe3 O4 core Au shell. To synthesize magnetic gold anisotropic core-shell particles, the seed-mediated synthetic method was carried out. By choosing an appropriate amount of iron particles and growth solution the fine control of the seed-mediated approach is enabled. This led to the high product yield of anisotropic nanoparticles. The magnetic separation of these nanoparticles was easily accomplished, and the resulting nanoparticles were characterized with transmission electron microscopy (TEM), ultraviolet visible spectroscopy (UV–vis), near edge absorption fine structure (NEXAFS) spectroscopy, and X-ray diffraction (XRD). Additionally, the magnetic properties of the nanoparticles were examined. The magnetic nanoparticles (MNPs) were modified with antibody and interacted with Escherichia coli (E. coli). The high capture efficiency between the magnetic nanoparticles and E. coli is evidenced by SEM images. The capture efficiency decreases with an increase of volumes, and the highest capture efficiency was observed for E. coli in an experiment volume of 100 μL for magnetic nanoparticles. The percentage of captured E. coli for polyhedral nanoparticles was found to be approximately 95 % and for spherical nanoparticles 88 %, respectively.
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Affiliation(s)
| | - Akif Bozkurt
- 2Department of Food Engineering, Faculty of Engineering, Hacettepe University, Beytepe 06800 Ankara, Turkey
| | - Ismail Hakki Boyaci
- 2Department of Food Engineering, Faculty of Engineering, Hacettepe University, Beytepe 06800 Ankara, Turkey
| | - Sadan Özcan
- 3Department of Engineering Physics, Faculty of Engineering, Hacettepe University, Beytepe 06800 Ankara, Turkey
| | - Philippe Daniel
- 4LUNAM Université, Université du Maine, Institut des Molécules et des Matériaux du Mans – IMMM – UMR CNRS 6283, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Fabienne Lagarde
- 4LUNAM Université, Université du Maine, Institut des Molécules et des Matériaux du Mans – IMMM – UMR CNRS 6283, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Alain Gibaud
- 4LUNAM Université, Université du Maine, Institut des Molécules et des Matériaux du Mans – IMMM – UMR CNRS 6283, Av. O. Messiaen, 72085 Le Mans Cedex 9, France
| | - Demet Cetin
- 5Science Teaching Programme, Gazi Faculty of Education, Gazi University, 06500 Ankara, Turkey
| | - Zekiye Suludere
- 6Department of Biology, Faculty of Science, Gazi University, 06500 Ankara, Turkey
| | - Peter Guttmann
- 7Helmholtz-Zentrum Berlin für Materialien Energie, Institute of Soft Matter and Functional Materials, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Ugur Tamer
- 8Department of Analytical Chemistry, Faculty of Pharmacy, Gazi University, Etiler, 06330 Ankara, Turkey
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Zengin A, Tamer U, Caykara T. Extremely sensitive sandwich assay of kanamycin using surface-enhanced Raman scattering of 2-mercaptobenzothiazole labeled gold@silver nanoparticles. Anal Chim Acta 2014; 817:33-41. [DOI: 10.1016/j.aca.2014.01.042] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 01/09/2014] [Accepted: 01/19/2014] [Indexed: 01/11/2023]
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Zengin A, Tamer U, Caykara T. A SERS-Based Sandwich Assay for Ultrasensitive and Selective Detection of Alzheimer’s Tau Protein. Biomacromolecules 2013; 14:3001-9. [DOI: 10.1021/bm400968x] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Adem Zengin
- Department of Chemistry, Faculty
of Science, Gazi University, 06500 Besevler,
Ankara, Turkey
| | - Ugur Tamer
- Department
of Analytical Chemistry,
Faculty of Pharmacy, Gazi University, 06330
Etiler, Ankara, Turkey
| | - Tuncer Caykara
- Department of Chemistry, Faculty
of Science, Gazi University, 06500 Besevler,
Ankara, Turkey
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33
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Zengin A, Tamer U, Caykara T. Synthesis of superparamagnetic and thermoresponsive hybrid nanoparticles via surface-mediated RAFT polymerization of di(ethylene glycol) ethyl ether acrylate and (oligoethylene glycol) methyl ether acrylate. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26739] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Adem Zengin
- Department of Chemistry, Gazi University, Faculty of Science; 06500 Besevler Ankara Turkey
| | - Ugur Tamer
- Department of Analytical Chemistry, Gazi University, Faculty of Pharmacy; 06330 Etiler Ankara Turkey
| | - Tuncer Caykara
- Department of Chemistry, Gazi University, Faculty of Science; 06500 Besevler Ankara Turkey
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Zengin A, Horngacher A, Meurer S, Bielohuby M, Bidlingmaier M. Low carbohydrate/high fat energy intake increases intramyocellular lipid content in skeletal muscle in rats. Exp Clin Endocrinol Diabetes 2013. [DOI: 10.1055/s-0033-1336731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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35
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Zengin A, Yildirim E, Tamer U, Caykara T. Molecularly imprinted superparamagnetic iron oxide nanoparticles for rapid enrichment and separation of cholesterol. Analyst 2013; 138:7238-45. [DOI: 10.1039/c3an01458d] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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36
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Temur E, Zengin A, Boyacı İH, Dudak FC, Torul H, Tamer U. Attomole sensitivity of staphylococcal enterotoxin B detection using an aptamer-modified surface-enhanced Raman scattering probe. Anal Chem 2012; 84:10600-6. [PMID: 23140575 DOI: 10.1021/ac301924f] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this report, we present a new homogeneous detection method for staphylococcal enterotoxin B (SEB) utilizing core-shell-structured iron-gold magnetic nanoparticles and a gold nanorod surface-enhanced Raman scattering (SERS) probe in solution. Peptide ligand (aptamer) functionalized magnetic gold nanorod particles were used as scavengers for target SEB. After the SEB molecules were separated from the matrix, the sandwich assay procedure was tested by gold nanorod particles that act as SERS probes. The binding constant between SEB and peptide-nanoparticle complex was determined as 8.0 × 10(7) M(-1). The correlation between the SEB concentration and SERS signal was found to be linear within the range of 2.5 fM to 3.2 nM. The limit of detection for the homogeneous assay was determined as 224 aM (ca. 2697 SEB molecules/20 μL sample volume). Also, gold-coated surfaces were used as capture substrates and performances of the two methods were compared. Furthermore, the developed method was evaluated for investigating the SEB specificity on bovine serum albumin (BSA) and avidin and detecting SEB in artificially contaminated milk, blood, and urine.
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Affiliation(s)
- Erhan Temur
- Department of Analytical Chemistry, Faculty of Pharmacy, Gazi University, 06330 Ankara, Turkey
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Zengin A, Yildirim E, Caykara T. RAFT‐mediated synthesis and temperature‐induced responsive properties of poly(2‐(2‐methoxyethoxy)ethyl methacrylate) brushes. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26460] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Adem Zengin
- Department of Chemistry, Faculty of Science, Gazi University, 06500 Ankara, Turkey
| | - Ertan Yildirim
- Department of Chemistry, Faculty of Science, Gazi University, 06500 Ankara, Turkey
| | - Tuncer Caykara
- Department of Chemistry, Faculty of Science, Gazi University, 06500 Ankara, Turkey
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38
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Zengin A, Caykara T. RAFT-mediated synthesis of poly[(oligoethylene glycol) methyl ether acrylate] brushes for biological functions. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26250] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Zengin A, Nguyen AD, Wong IPL, Zhang L, Enriquez RF, Eisman JA, Herzog H, Baldock PA, Sainsbury A. Neuropeptide Y mediates the short-term hypometabolic effect of estrogen deficiency in mice. Int J Obes (Lond) 2012; 37:390-8. [PMID: 22565420 DOI: 10.1038/ijo.2012.71] [Citation(s) in RCA: 12] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Estrogen deficiency increases body weight or total and central adiposity and decreases energy expenditure. Hypothalamic neuropeptide Y (NPY) expression is altered by estrogen deficiency in rodents, but the long-term consequences on energy homeostasis are unknown. OBJECTIVE To investigate the role of NPY in the changes in energy expenditure and physical activity, as well as the associated changes in body weight and composition in response to short-term and long-term estrogen deficiency. DESIGN Sham and ovariectomy (OVX) operations were performed at 8 weeks of age in wild-type (WT) and NPY(-/-) mice. Energy expenditure, physical activity, body composition and weight, as well as food intake were measured at 10-18 days (short-term) and 46-54 days (long-term) after OVX. RESULTS OVX influences energy homeostasis differently at early compared with later time-points. At the early but not the late time point, OVX in WT mice reduced oxygen consumption and energy expenditure and tended to reduce resting metabolic rate. Interestingly, these effects of short-term estrogen deficiency were ablated by NPY deletion, with NPY(-/-) mice exhibiting significant increases in energy expenditure and resting metabolic rate. In addition to these hypermetabolic effects, OVX NPY(-/-) mice exhibited significantly lower body weight and whole-body fat mass relative to OVX WT controls at the short-term but not the long-term time point. Food intake and physical activity were unaltered by OVX, but NPY(-/-) mice exhibited significant reductions in these parameters relative to WT. CONCLUSION The effects of estrogen deficiency to reduce energy metabolism are transient, and NPY is critical to this effect as well as the early OVX-induced obesity.
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Affiliation(s)
- A Zengin
- Osteoporosis and Bone Biology, Garvan Institute of Medical Research, St Vincent's Hospital, Sydney, New South Wales, Australia
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Wang Q, Zengin A, Ying W, Newell KA, Wang P, Yeo W, Wong PTH, Yenari MA, Huang XF. Chronic treatment with simvastatin upregulates muscarinic M1/4 receptor binding in the rat brain. Neuroscience 2008; 154:1100-6. [PMID: 18501522 DOI: 10.1016/j.neuroscience.2008.04.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2008] [Revised: 04/10/2008] [Accepted: 04/10/2008] [Indexed: 10/22/2022]
Abstract
Statins are increasingly being used for the treatment of a variety of conditions beyond their original indication for cholesterol lowering. We previously reported that simvastatin affected the dopaminergic system in the rat brain. This study aims to investigate regional changes of muscarinic M1/4 receptors in the rat brain after 4-week administration of simvastatin (1 or 10 mg/kg/day). M1/4 receptor distribution and alterations in the post-mortem rat brain were detected by [(3)H]pirenzepine binding autoradiography. Simvastatin (1 mg/kg/day) increased [(3)H]pirenzepine binding, predominantly in the prefrontal cortex (171%, P<0.001), primary motor cortex (153%, P=0.001), cingulate cortex (109%, P<0.001), hippocampus (138%, P<0.001), caudate putamen (122%, P=0.002) and nucleus accumbens (170%, P<0.001) compared with controls; while lower but still significant increases of [(3)H]pirenzepine binding were observed in the examined regions following simvastatin (10 mg/kg/day) treatment. Our results also provide strong evidence that chronic simvastatin administration, especially at a low dosage, up-regulates M1/4 receptor binding, which is likely to be independent of its muscarinic agonist-like effect. Alterations in [(3)H]pirenzepine binding in the examined brain areas may represent the specific regions that mediate the clinical effects of simvastatin treatment on cognition and memory via the muscarinic cholinergic system. These findings contribute to a better understanding of the critical roles of simvastatin in treating neurodegenerative disorders, via muscarinic receptors.
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Affiliation(s)
- Q Wang
- Neurobiology Research Centre, School of Health Sciences and Graduate School of Medicine, University of Wollongong, Wollongong, NSW 2522, Australia.
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Abstract
Cholelithiasis in neonates and infants has been rarely reported. With the current widespread use of diagnostic ultrasonography, more neonates may be found with gallstones and common bile duct stones. We describe a case of asymptomatic gallstones detected incidentally at the age of four days who presented with early onset of neonatal sepsis and dehydration.
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Affiliation(s)
- E C Citak
- Department of Pediatrics, Gazi University and Faculty of Medicine, Ankara, Turkey.
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Abstract
A new triterpenoid saponin, coumoside A, has been isolated from the whole plant of Cyclamen coum and the structure of this novel saponin (C58H92O27) has been deduced by NMR methods based on 1H, 13C, DEPT, 1H-1H COSY, HETCOR, NOESY-NMR experiments and the FAB-mass spectrum. It has the structure 3 beta-O-[beta-D-glucopyranosyl-(1-6)-[alpha-L-arabinopyranosyl- (1-2)]-beta-D-glucopyranosyl-(1-4)-[beta-D-glucopyranosyl-(1-2)]-alpha-L -arabinopyranosyl]-16 alpha-hydroxy-30,28 beta-lactone-olean-12-ene and is called coumoside.
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Affiliation(s)
- N Yayli
- Karadeniz Technical University, Department of Chemistry, Trabzon, Turkey
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Yayli N, Baltaci C, Zengin A, Küçükislamoğlu M, Genç H, Küçük M. Pentacyclic triterpenoid saponin from Cyclamen coum. Planta Med 1998; 64:382-384. [PMID: 9619124 DOI: 10.1055/s-2006-957459] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A new triterpenoid saponin, coumoside B, has been isolated from the whole plant of Cyclamen coum. The structure of the compound 3 (C58H92O27) has been deduced by NMR (400 MHz) methods based on the 1H, 13C, DEPT, 1H-1H COSY, HETCOR, NOESY-NMR experiments, and FAB-mass spectrum. Compound 3 was shown to have the structure 16 alpha-hydroxy-3 beta-[[[[beta-xylopyranosyl-(1-->2)]-[beta-glucopyranosyl-(1-->4)]- [beta-glucopyranosyl-(1-->2)]- alpha-arabinopyranosyl]-oxy]olean-12-eno-30,28-lactone and is named coumoside B.
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