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Wang T, Hu J, Hou Z, Yang H. Antifouling and Antioxidant Properties of PVDF Membrane Modified with Polyethylene Glycol Methacrylate and Propyl Gallate. MATERIALS (BASEL, SWITZERLAND) 2024; 17:1867. [PMID: 38673223 PMCID: PMC11052291 DOI: 10.3390/ma17081867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 04/13/2024] [Accepted: 04/17/2024] [Indexed: 04/28/2024]
Abstract
In this study, molecules of propyl gallate (PG) and polyethylene glycol methacrylate (PEGMA) were covalently bonded via a transesterification reaction and subsequently grafted onto polyvinylidene fluoride substrates using a homogeneous radiation grafting technique. The enhancement of the membranes' hydrophilicity with the increment of the grafting rate was corroborated by scanning electron microscopy imaging and measurements of the water contact angle. At a grafting degree of 10.1% and after a duration of 4 min, the water contact angle could decrease to as low as 40.1°. Cyclic flux testing demonstrated that the membranes modified in this manner consistently achieved a flux recovery rate exceeding 90% across varying degrees of grafting, indicating robust anti-fouling capabilities. Furthermore, these modified membranes exhibited significant antioxidant ability while maintaining antifouling performance over 30 days. The ability of the modified membranes to scavenge 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS+) free radicals remained nearly unchanged after being stored in pure water for 30 days, and the flux recovery rate remained above 95% after immersion in sodium hypochlorite solution for 30 days. Among the tested membranes, the PVDF-g-PEGMAG modified membrane with a grafting degree of 7.2% showed the best antioxidant effect.
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Affiliation(s)
- Ting Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; (T.W.); (J.H.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Hu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; (T.W.); (J.H.)
| | - Zhengchi Hou
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
| | - Haijun Yang
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
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Wang T, Hou Z, Yang H, Hu J. A PEGylated PVDF Antifouling Membrane Prepared by Grafting of Methoxypolyethylene Glycol Acrylate in Gama-Irradiated Homogeneous Solution. MATERIALS (BASEL, SWITZERLAND) 2024; 17:873. [PMID: 38399124 PMCID: PMC10890161 DOI: 10.3390/ma17040873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/07/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024]
Abstract
In this study, methoxypolyethylene glycol acrylate (mPEGA) served as a PEGylated monomer and was grafted onto polyvinylidene fluoride (PVDF) through homogeneous solution gamma irradiation. The grafting process was confirmed using several techniques, including infrared spectroscopy (FTIR), thermodynamic stability assessments, and rotational viscosity measurements. The degree of grafting (DG) was determined via the gravimetric method. By varying the monomer concentration, a range of DGs was achieved in the PVDF-g-mPEGA copolymers. Investigations into water contact angles and scanning electron microscopy (SEM) images indicated a direct correlation between increased hydrophilicity, membrane porosity, and higher DG levels in the PVDF-g-mPEGA membrane. Filtration tests demonstrated that enhanced DGs resulted in more permeable PVDF-g-mPEGA membranes, eliminating the need for pore-forming agents. Antifouling tests revealed that membranes with a lower DG maintained a high flux recovery rate, indicating that the innate properties of PVDF could be largely preserved.
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Affiliation(s)
- Ting Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; (T.W.); (J.H.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhengchi Hou
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
| | - Haijun Yang
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
| | - Jun Hu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; (T.W.); (J.H.)
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China;
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3
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Ozyilmaz E, Alhiali A, Caglar O, Yilmaz M. Preparation of regenerable magnetic nanoparticles for cellulase immobilization: Improvement of enzymatic activity and stability. Biotechnol Prog 2021; 37:e3145. [PMID: 33720529 DOI: 10.1002/btpr.3145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 03/11/2021] [Accepted: 03/11/2021] [Indexed: 11/10/2022]
Abstract
To obtain regenerable magnetic nanoparticles, triethoxy(3-isocyanatopropyl)silane and iminodiacetic acid (IZ) were used as the starting material and immobilized on Fe3 O4 nanoparticles. Copper ions (Cu2+ ions) were loaded on the Fe-IZ nanoparticles and used for cellulase immobilization. The support was characterized by spectroscopic methods (FTIR, NMR) and thermogravimetric analysis, transmission electron microscopy, scanning electron microscope, X-ray diffraction, energy dispersive X-ray analysis, and vibrating sample magnetometer techniques. As a result of experiments, the amount of protein bound to immobilized cellulase (Fe-IZ-Cu-E) and cellulase activity was found to be 33.1 mg/g and 154 U/g at pH 5, 50°C, for 3 h. The results indicated that the free cellulase had kept only 50% of its activity after 2 h, while the Fe-IZ-Cu-E was observed to be around 77%, at 60°C. It was found that the immobilized cellulase maintained 93% of its initial catalytic activity after its sixth use. Furthermore, the Fe-IZ-Cu-E retained about 75% of its initial activity after 28 days of storage. To reuse the support material (Fe-IZ-Cu), it was regenerated by thorough washing with ammonia or imidazole.
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Affiliation(s)
- Elif Ozyilmaz
- Department of Biochemistry, Selcuk University, Konya, Turkey
| | - Ahmet Alhiali
- Department of Chemistry, Selcuk University, Konya, Turkey
| | - Ozge Caglar
- Department of Chemistry, Selcuk University, Konya, Turkey
| | - Mustafa Yilmaz
- Department of Chemistry, Selcuk University, Konya, Turkey
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4
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Preparation of Chitosan/Magnetic Porous Biochar as Support for Cellulase Immobilization by Using Glutaraldehyde. Polymers (Basel) 2020; 12:polym12112672. [PMID: 33198227 PMCID: PMC7697689 DOI: 10.3390/polym12112672] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/11/2020] [Accepted: 11/11/2020] [Indexed: 11/17/2022] Open
Abstract
In this work, porous biochar was obtained from sugarcane bagasse by alkali activation and pyrolysis and then magnetized with γ-Fe2O3 by calcination. After functionalization with chitosan and activation with glutaraldehyde, the as-prepared chitosan/magnetic porous biochar served as a support to immobilize cellulase by covalent bonds. The immobilization amount of cellulase was 80.5 mg cellulase/g support at pH 5 and 25 °C for 12 h of immobilization. To determine the enzymatic properties, 1% carboxymethyl cellulose sodium (CMC) (dissolved in 0.1 M buffer) was considered as a substrate for hydrolysis at different pH values (3–7) and temperatures (30–70 °C) for 30 min. The results showed that the optimum pH and temperature of the free and immobilized cellulase did not change, which were pH 4 and 60 °C, respectively. The immobilized cellulase had a relatively high activity recovery of 73.0%. However, it also exhibited a higher Michaelis–Menten constant (Km) value and a slower maximum reaction velocity (Vmax) value compared to the free enzyme. In the reusability assay, the immobilized cellulase showed initial glucose productivity of 330.9 mg glucose/g CMC and remained at 86.0% after 10 uses. In conclusion, the chitosan/magnetic porous biochar has great potential applications as a support for enzyme immobilization.
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Kai Fan, Liu E, Zhou G, Li J. Preparation of Filtration Membrane by Grafting of Poly(N-vinylpyrrolidone) onto Polyethersulfone and Its Influence on Pollution Resistance of Membrane. POLYMER SCIENCE SERIES B 2020. [DOI: 10.1134/s156009042005005x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Alsharif N, Uzarski JR, Lawton TJ, Brown KA. High-Throughput Multiobjective Optimization of Patterned Multifunctional Surfaces. ACS APPLIED MATERIALS & INTERFACES 2020; 12:32069-32077. [PMID: 32551476 DOI: 10.1021/acsami.0c04202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The realization and optimization of multifunctional materials is difficult, especially when the functionalities are directly incompatible. For example, it is challenging to make surfaces both enzymatically active and water repellent, as these two properties are directly competitive because of the hydrophilic nature of the enzyme-laden surfaces. Patterning discrete domains of distinct functionalities can represent a path to multifunctionality, but the innumerable possible domain permutations present a major barrier to optimizing performance. Here, we develop a high-throughput approach for exploring patterned multifunctional surfaces that is inspired by the microtiter plate architecture. As a model system, patterned surfaces are realized with horseradish peroxidase-decorated domains amidst a background of hydrophobic fluorinated self-assembled monolayers. In experiments exploring effects of pattern geometry, the measured enzyme activity is dependent only on the surface coverage. In contrast, roll-off behavior strongly depends on the parameters of the pattern geometry. Importantly, this finding enables the precise tailoring of distinct wetting behavior of the surfaces in a manner that is independent of their enzymatic activity. The high-throughput nature of the platform facilitates multiobjective optimization of surface functionalities in a general and flexible manner.
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Affiliation(s)
- Nourin Alsharif
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - Joshua R Uzarski
- Soldier Protection and Survivability Directorate, US Army Combat Capabilities Development Command Soldier Center, Natick, Massachusetts 01760, United States
| | - Timothy J Lawton
- Soldier Protection and Survivability Directorate, US Army Combat Capabilities Development Command Soldier Center, Natick, Massachusetts 01760, United States
| | - Keith A Brown
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, United States
- Physics Department and Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, United States
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Han P, Zhou X, You C. Efficient Multi-Enzymes Immobilized on Porous Microspheres for Producing Inositol From Starch. Front Bioeng Biotechnol 2020; 8:380. [PMID: 32478043 PMCID: PMC7232586 DOI: 10.3389/fbioe.2020.00380] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 04/06/2020] [Indexed: 01/21/2023] Open
Abstract
In vitro synthetic enzymatic biosystem is considered to be the next generation of biomanufacturing platform. This biosystem contains multiple enzymes for the implementation of complicated biotransformatiom. However, the hard-to-reuse and instability of multiple enzymes limit the utilization of this biosystem in industrial process. Multi-enzyme immobilization might be a feasible alternative to address these problems. Herein, porous microspheres are used as carriers to co-immobilize multiple enzymes for producing inositol from starch. At first, all the enzymes (i.e., α-glucan phosphorylase aGP, phosphoglucose mutase PGM, inositol 1-phosphate synthase IPS, and inositol monophosphatase IMP) for converting starch to inositol were immobilized on porous microspheres individually to check the effect of immobilization, then all the enzymes are co-immobilized on porous microspheres. Compared to reaction system containing all the individual immobilized enzymes, the reaction system containing the co-immobilized enzymes exhibit ∼3.5 fold of reaction rate on producing inositol from starch. This reaction rate is comparable to that by free enzyme mixture. And the co-immobilized multi-enzyme system show higher thermal stability and recovery stability than free enzyme mixture. After 7 batches, the immobilized enzymes retain 45.6% relative yield, while the free enzyme mixture only retain 13.3% relative yield after 3 batches. Co-immobilization of multiple enzymes on porous microspheres for biomanufacturing would shed light on the application of in vitro synthetic enzymatic biosystem in industrial scale.
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Affiliation(s)
- Pingping Han
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Xigui Zhou
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
| | - Chun You
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China.,University of Chinese Academy of Sciences, Beijing, China
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8
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EIN ALI AFJEH M, POURAHMAD R, AKBARI-ADERGANI B, AZIN M. Characteristics of glucose oxidase immobilized on Magnetic Chitosan Nanoparticles. FOOD SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1590/fst.32618] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
| | | | | | - Mehrdad AZIN
- Iranian Research Organization for Science and Technology, Iran
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9
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Cen Y, Liu Y, Xue Y, Zheng Y. Immobilization of Enzymes in/on Membranes and their Applications. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900439] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yu‐Ke Cen
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and BioengineeringZhejiang University of Technology Hangzhou 310014 People's Republic of China
- Engineering Research Center of Bioconversion and Biopurification of Ministry of EducationZhejiang University of Technology Hangzhou 310014 People's Republic of China
| | - Yu‐Xiao Liu
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and BioengineeringZhejiang University of Technology Hangzhou 310014 People's Republic of China
- Engineering Research Center of Bioconversion and Biopurification of Ministry of EducationZhejiang University of Technology Hangzhou 310014 People's Republic of China
| | - Ya‐Ping Xue
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and BioengineeringZhejiang University of Technology Hangzhou 310014 People's Republic of China
- Engineering Research Center of Bioconversion and Biopurification of Ministry of EducationZhejiang University of Technology Hangzhou 310014 People's Republic of China
| | - Yu‐Guo Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and BioengineeringZhejiang University of Technology Hangzhou 310014 People's Republic of China
- Engineering Research Center of Bioconversion and Biopurification of Ministry of EducationZhejiang University of Technology Hangzhou 310014 People's Republic of China
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10
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Mondal P, Samanta NS, Meghnani V, Purkait MK. Selective glucose permeability in presence of various salts through tunable pore size of pH responsive PVDF-co-HFP membrane. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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11
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Barnes E, Jefcoat JA, Alberts EM, McKechnie MA, Peel HR, Buchanan JP, Weiss CA, Klaus KL, Mimun LC, Warner CM. Effect of Cellulose Nanofibrils and TEMPO-mediated Oxidized Cellulose Nanofibrils on the Physical and Mechanical Properties of Poly(vinylidene fluoride)/Cellulose Nanofibril Composites. Polymers (Basel) 2019; 11:polym11071091. [PMID: 31252644 PMCID: PMC6680576 DOI: 10.3390/polym11071091] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 06/24/2019] [Accepted: 06/25/2019] [Indexed: 11/16/2022] Open
Abstract
Cellulose nanofibrils (CNFs) are high aspect ratio, natural nanomaterials with high mechanical strength-to-weight ratio and promising reinforcing dopants in polymer nanocomposites. In this study, we used CNFs and oxidized CNFs (TOCNFs), prepared by a 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation process, as reinforcing agents in poly(vinylidene fluoride) (PVDF). Using high-shear mixing and doctor blade casting, we prepared free-standing composite films loaded with up to 5 wt % cellulose nanofibrils. For our processing conditions, all CNF/PVDF and TOCNF/PVDF films remain in the same crystalline phase as neat PVDF. In the as-prepared composites, the addition of CNFs on average increases crystallinity, whereas TOCNFs reduces it. Further, addition of CNFs and TOCNFs influences properties such as surface wettability, as well as thermal and mechanical behaviors of the composites. When compared to neat PVDF, the thermal stability of the composites is reduced. With regards to bulk mechanical properties, addition of CNFs or TOCNFs, generally reduces the tensile properties of the composites. However, a small increase (~18%) in the tensile modulus was observed for the 1 wt % TOCNF/PVDF composite. Surface mechanical properties, obtained from nanoindentation, show that the composites have enhanced performance. For the 5 wt % CNF/PVDF composite, the reduced modulus and hardness increased by ~52% and ~22%, whereas for the 3 wt % TOCNF/PVDF sample, the increase was ~23% and ~25% respectively.
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Affiliation(s)
- Eftihia Barnes
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA.
| | - Jennifer A Jefcoat
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | | | - Mason A McKechnie
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - Hannah R Peel
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - J Paige Buchanan
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - Charles A Weiss
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - Kyle L Klaus
- Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - L Christopher Mimun
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
| | - Christopher M Warner
- Environmental Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS, USA
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Jamwal S, Dautoo UK, Ranote S, Dharela R, Chauhan GS. Enhanced catalytic activity of new acryloyl crosslinked cellulose dialdehyde-nitrilase Schiff base and its reduced form for nitrile hydrolysis. Int J Biol Macromol 2019; 131:117-126. [DOI: 10.1016/j.ijbiomac.2019.03.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/28/2019] [Accepted: 03/04/2019] [Indexed: 12/27/2022]
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13
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Memon AH, Ding R, Yuan Q, Liang H, Wei Y. Coordination of GMP ligand with Cu to enhance the multiple enzymes stability and substrate specificity by co-immobilization process. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2018.04.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Han J, Luo P, Wang Y, Wang L, Li C, Zhang W, Dong J, Ni L. The development of nanobiocatalysis via the immobilization of cellulase on composite magnetic nanomaterial for enhanced loading capacity and catalytic activity. Int J Biol Macromol 2018; 119:692-700. [PMID: 30071227 DOI: 10.1016/j.ijbiomac.2018.07.176] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 07/27/2018] [Accepted: 07/28/2018] [Indexed: 10/28/2022]
Abstract
In this study, graphene oxide (GO) decorated with 4arm‑PEG‑NH2 (molecular weight (MW) 5 K or 10 K) was constructed on magnetic Fe3O4, denoted as GO@Fe3O4@4arm‑PEG‑NH2. The morphology, structure and magnetic property of GO@Fe3O4@4arm‑PEG‑NH2 were characterized by Fourier transform infrared (FTIR), vibrating-sample magnetometer (VSM), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) in details. The saturation loading capacity of GO@Fe3O4@4arm‑PEG‑NH2 (MW 5 K and 1 K) carriers toward cellulase was 429 and 575 mg/g, respectively. Additionally, the immobilized cellulase had exhibited enhanced thermostability, storability and reusability than free enzyme. The two kinds of immobilized cellulose (MW 5 K and 10 K) retained 57% and 60% of its initial activity after 3 h at 70 °C, and retained 47% and 50% of its initial activity after 30 days' storage at room temperature. After eight times reuse, immobilized cellulose (MW 5 K and 10 K) retained 40% and 45% of its initial activity, respectively. In practical application, glucose generated by the saccharification with the immobilized cellulase was much higher than free enzyme (immobilized enzyme is kept at 2.04-2.83 times of the free enzyme), when the loading amount of enzyme was 2-8 mg, indicating the potential of the prepared biocatalyst.
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Affiliation(s)
- Juan Han
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Peng Luo
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Yun Wang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Li Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Chunmei Li
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Wenli Zhang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Jian Dong
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Liang Ni
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
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15
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Preparation and characterization of Fe3O4-NH2@4-arm-PEG-NH2, a novel magnetic four-arm polymer-nanoparticle composite for cellulase immobilization. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2017.11.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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16
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Synthesis and characterization of a new poly(dithieno (3,2-b:2′, 3′-d) pyrrole) derivative conjugated polymer: Its electrochromic and biosensing applications. POLYMER 2018. [DOI: 10.1016/j.polymer.2017.11.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Ji J, Joh HI, Chung Y, Kwon Y. Glucose oxidase and polyacrylic acid based water swellable enzyme-polymer conjugates for promoting glucose detection. NANOSCALE 2017; 9:15998-16004. [PMID: 29022639 DOI: 10.1039/c7nr05545e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Glucose oxidase (GOx) and polyacrylic acid (PAA) based water swellable non-toxic enzyme-polymer conjugate (PAA-GOx) was immobilized on a substrate consisting of graphene oxide (GO) and polyethyleneimine (PEI) (GO-PEI) and the electrochemical performances of the new catalyst were investigated. According to the measurements, although the amount of GOx immobilized on PAA-GOx was lower than that on glutaraldehyde (GA)-GOx, which is a conventionally used conjugate, its catalytic activity was 9.6 times higher than that of GA-GOx. The superior catalytic activity (102.0 μA cm-2, 20 mM of glucose) and glucose sensitivity (6.9 μA cm-2 mM-1) were due to its high swellability in water. Due to this, the PAA-GOx absorbs a large amount of aqueous glucose molecules and rapidly transfers them to the active site of GOx. Desirable hydrogen peroxide and glucose oxidation reactions are accordingly promoted. In addition, since PAA has abundant free carboxylic acid groups, the PAA-GOx forms covalent bonds with the GO-PEI to curtail the leaching-out of GOx molecules.
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Affiliation(s)
- Jungyeon Ji
- Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea.
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18
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Kumari A, Datta S. Phospholipid bilayer functionalized membrane pores for enhanced efficiency of immobilized glucose oxidase enzyme. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.05.060] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Hoffmann C, Pinelo M, Woodley JM, Daugaard AE. Development of a thiol-ene based screening platform for enzyme immobilization demonstrated using horseradish peroxidase. Biotechnol Prog 2017; 33:1267-1277. [DOI: 10.1002/btpr.2526] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/07/2017] [Indexed: 12/21/2022]
Affiliation(s)
- Christian Hoffmann
- Dept. of Chemical and Biochemical Engineering, Danish Polymer Centre; Technical University of Denmark; Søltofts Plads Building 229, 2800 Kgs, Lyngby Denmark
| | - Manuel Pinelo
- Dept. of Chemical and Biochemical Engineering, Center for BioProcess Engineering; Technical University of Denmark; Søltofts Plads Building 229, 2800 Kgs, Lyngby Denmark
| | - John M. Woodley
- Dept. of Chemical and Biochemical Engineering, Process and Systems Engineering Center (PROSYS); Technical University of Denmark; Søltofts Plads Building 229, 2800 Kgs., Lyngby Denmark
| | - Anders E. Daugaard
- Dept. of Chemical and Biochemical Engineering, Danish Polymer Centre; Technical University of Denmark; Søltofts Plads Building 229, 2800 Kgs, Lyngby Denmark
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Vardar G, Altikatoglu M, Basaran Y, Işıldak İ. Synthesis of glucose oxidase-PEG aldehyde conjugates and improvement of enzymatic stability. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2017; 46:788-794. [PMID: 28679282 DOI: 10.1080/21691401.2017.1345920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
In this article, aldehyde derivative of poly(ethylene glycol) (PEG) was synthesized directly with sodium periodate agent. To obtain a conjugate which possesses better stability, PEG aldehyde was bonded to native enzyme with different molar ratios. The conjugation reaction turned out to be efficient and mild. Colorimetric method was applied to evaluate the enzymatic activity of native GOD and its derivatives by introducing another enzyme, horseradish peroxidase. The GOD-PEG aldehyde conjugate with polymeric chains exhibited reduced enzymatic activity towards the catalytical oxidation of glucose, but with significantly increased thermal stability and elongated lifetime. When GOD was modified with PEG aldehyde the enzymatic activity was decreased 40% at 30 °C. However, when incubated at 60 °C the GOD-PEG aldehyde conjugate still retained the enzyme bioactivity of 40% bioactivity left after 4 h, whereas the native GOD lost almost all the activity in 4 h. The polymer chain attached, the more reduction of the enzymatic activity resulted, however, the longer the lifetime and higher thermal stability of the enzyme obtained.
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Affiliation(s)
- Gökay Vardar
- a Department of Chemistry, Faculty of Arts and Sciences , Yildiz Technical University , Istanbul , Turkey
| | - Melda Altikatoglu
- a Department of Chemistry, Faculty of Arts and Sciences , Yildiz Technical University , Istanbul , Turkey
| | - Yeliz Basaran
- b Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering , Yildiz Technical University , Istanbul , Turkey
| | - İbrahim Işıldak
- b Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering , Yildiz Technical University , Istanbul , Turkey
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21
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Electrochemical Measurements of Glucose Using a Micro Flow-Through Immobilized Enzyme Reactor. ELECTROANAL 2017. [DOI: 10.1002/elan.201700038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Xu G, Xu Y, Li A, Chen T, Liu J. Enzymatic bioactivity investigation of glucose oxidase modified with hydrophilic or hydrophobic polymers via in situ RAFT polymerization. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28503] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Gengfang Xu
- Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering; Institute for Graphene Applied Technology Innovation; Laboratory of Fiber Materials and Modern Textiles, the Growing Base for State Key Laboratory; Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province; Qingdao University; Qingdao 266071 China
| | - Yuanhong Xu
- Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering; Institute for Graphene Applied Technology Innovation; Laboratory of Fiber Materials and Modern Textiles, the Growing Base for State Key Laboratory; Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province; Qingdao University; Qingdao 266071 China
| | - Aihua Li
- Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering; Institute for Graphene Applied Technology Innovation; Laboratory of Fiber Materials and Modern Textiles, the Growing Base for State Key Laboratory; Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province; Qingdao University; Qingdao 266071 China
| | - Tao Chen
- Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering; Institute for Graphene Applied Technology Innovation; Laboratory of Fiber Materials and Modern Textiles, the Growing Base for State Key Laboratory; Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province; Qingdao University; Qingdao 266071 China
| | - Jingquan Liu
- Center for Micro/Nano Luminescent and Electrochemical Materials, College of Materials Science and Engineering; Institute for Graphene Applied Technology Innovation; Laboratory of Fiber Materials and Modern Textiles, the Growing Base for State Key Laboratory; Collaborative Innovation Center for Marine Biomass Fibers Materials and Textiles of Shandong Province; Qingdao University; Qingdao 266071 China
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23
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Morthensen ST, Meyer AS, Jørgensen H, Pinelo M. Significance of membrane bioreactor design on the biocatalytic performance of glucose oxidase and catalase: Free vs. immobilized enzyme systems. Biochem Eng J 2017. [DOI: 10.1016/j.bej.2016.09.015] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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24
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Mathesh M, Liu J, Barrow CJ, Yang W. Graphene-Oxide-Based Enzyme Nanoarchitectonics for Substrate Channeling. Chemistry 2016; 23:304-311. [DOI: 10.1002/chem.201604348] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Motilal Mathesh
- Centre for Chemistry and Biotechnology; School of Life and Environmental Sciences; Deakin University; Geelong, Victoria 3217 Australia
| | - Jingquan Liu
- College of Materials Science and Engineering; Qingdao University; Qingdao 266071 P.R. China
| | - Colin J. Barrow
- Centre for Chemistry and Biotechnology; School of Life and Environmental Sciences; Deakin University; Geelong, Victoria 3217 Australia
| | - Wenrong Yang
- Centre for Chemistry and Biotechnology; School of Life and Environmental Sciences; Deakin University; Geelong, Victoria 3217 Australia
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25
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Sahin S, Ozmen I. Determination of optimum conditions for glucose-6-phosphate dehydrogenase immobilization on chitosan-coated magnetic nanoparticles and its characterization. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Hu D, Yang H, Liu J, Lei Z. Synthesis of pH-responsive β-CD-based star polymer and impact of its self-assembly behavior on pectinase activity. Biotechnol Appl Biochem 2016; 64:187-194. [PMID: 26749579 DOI: 10.1002/bab.1474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 12/30/2015] [Indexed: 01/30/2023]
Abstract
A novel type of pH-responsive star polymer based on β-cyclodextrin (β-CD) was synthesized and further covalently conjugated with enzyme. The impact of its self-assembly behavior on enzyme activity was investigated. In our design, azide containing the polymer (N3 )7 -β-CD-(PtBA)14 was synthesized via atom transfer radical polymerization of tert-butyl acrylate using (N3 )7 -β-CD-(Br)14 as the multifunctional initiator. The final product (N3 )7 -β-CD-(PAA)14 was obtained via hydrolysis and covalently conjugating pectinase onto pH-responsive polyacrylic acid (PAA) arms. PAA can change its conformation with the self-assembly by altered pH, leading its nanostructure into micellar nanoparticles in aqueous solution and further affecting the activity of immobilized pectinase. The results were proved by fluorescence spectroscopy and dynamic light scattering. This system proves that the activity of immobilized enzyme can be tailored predictably, and this pH-responsive polymer holds great potential for controllable delivery of enzymes.
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Affiliation(s)
- Dong Hu
- Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi, People's Republic of China
| | - Hong Yang
- Basic Experimental Teaching Center, Shaanxi Normal University, Xi'an, Shaanxi, People's Republic of China
| | - Jiangtao Liu
- College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, People's Republic of China
| | - Zhongli Lei
- Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi, People's Republic of China
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27
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Kumari S, Chauhan GS, Ahn JH, Reddy NS. Bio-waste derived dialdehyde cellulose ethers as supports for α-chymotrypsin immobilization. Int J Biol Macromol 2015; 85:227-37. [PMID: 26723248 DOI: 10.1016/j.ijbiomac.2015.12.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 11/24/2015] [Accepted: 12/17/2015] [Indexed: 02/01/2023]
Abstract
Enzyme immobilization is an important technique to enhance stability, storability and reusability of enzymes. In the present work, pine needles, a forest bio-waste, were used as a feedstock of cellulose to synthesize new materials as supports for immobilization of α-chymotrypsin (CT) enzyme. The extracted cellulose from pine needles was etherified with different alkyl bromides (RBr) and etherified products were further modified to dialdehyde via oxidation with NaIO4 to get the desired products, dialdehyde cellulose ethers (ROcellCHO). CT was then covalently immobilized onto as-synthesized dialdehyde cellulose ethers via Schiff-base formation, i.e., imine linkage. The synthesized products and enzyme immobilization were confirmed by different characterization techniques and the activity assay of the free and the immobilized CT was carried out using standard protocol with variation of different parameters such as temperature, pH and substrate concentration. The storage stability and reusability of the immobilized CT were also investigated. CT activity was also studied in simulated physiological conditions in the artificial gastric fluid and artificial intestinal fluid. Artificial neural network (ANN) model was employed to correlate the relationship with% relative activity and time, temperature and pH affecting enzyme activity. A good correlation of experimental data was predicted by ANN model.
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Affiliation(s)
- Sapana Kumari
- Himachal Pradesh University, Department of Chemistry, Summer Hill, Shimla, 171005 Himachal Pradesh, India
| | - Ghanshyam S Chauhan
- Himachal Pradesh University, Department of Chemistry, Summer Hill, Shimla, 171005 Himachal Pradesh, India.
| | - Jou-Hyeon Ahn
- Department of Chemical Engineering and Research Institute for Green Energy Convergence Technology, Gyeongsang National University, 501 Jinju-daero, Jinju 660-701, Republic of Korea
| | - N S Reddy
- School of Materials Science and Engineering and Engineering Research Institute, Gyeongsang National University, 900 Gajwa-Dong, Jinju 660-701, Republic of Korea.
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28
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Altun S, Çakıroğlu B, Özacar M, Özacar M. A facile and effective immobilization of glucose oxidase on tannic acid modified CoFe 2 O 4 magnetic nanoparticles. Colloids Surf B Biointerfaces 2015; 136:963-70. [DOI: 10.1016/j.colsurfb.2015.10.053] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 09/22/2015] [Accepted: 10/30/2015] [Indexed: 10/22/2022]
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29
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Zhu ML, Lu QL, Ma KZ, Meng YF, Jiang Y. Preparation and properties of controllable amphiphilic P(NIPAM-co-LMA) gel for drug delivery. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.08.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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30
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Effects of the immobilization of recombinant Escherichia coli on cyclodextrin glucanotransferase (CGTase) excretion and cell viability. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2015.02.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Temperature- and pH-sensitive membrane formed from blends of poly(vinylidene fluoride)-graft-poly(N-isopropylacrylamide) and poly(acrylic acid) microgels. REACT FUNCT POLYM 2014. [DOI: 10.1016/j.reactfunctpolym.2014.08.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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32
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Chen X, He Y, Shi C, Fu W, Bi S, Wang Z, Chen L. Temperature- and pH-responsive membranes based on poly (vinylidene fluoride) functionalized with microgels. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.07.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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33
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Zhang J, Wang Q, Wang Z, Zhu C, Wu Z. Modification of poly(vinylidene fluoride)/polyethersulfone blend membrane with polyvinyl alcohol for improving antifouling ability. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2014.05.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Chen X, Zhao B, Zhao L, Bi S, Han P, Feng X, Chen L. Temperature- and pH-responsive properties of poly(vinylidene fluoride) membranes functionalized by blending microgels. RSC Adv 2014. [DOI: 10.1039/c4ra02724h] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Chekin F, Yazdaninia M. A sensor based on incorporating Ni2+ into ZnO nanoparticles-multi wall carbon nanotubes-poly methyl metacrylat nanocomposite film modified carbon paste electrode for determination of carbohydrates. RUSS J ELECTROCHEM+ 2014. [DOI: 10.1134/s1023193514040041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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36
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37
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Estrada-Villegas G, Bucio E. Comparative study of grafting a polyampholyte in a fluoropolymer membrane by gamma radiation in one or two-steps. Radiat Phys Chem Oxf Engl 1993 2013. [DOI: 10.1016/j.radphyschem.2013.07.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Kuo CH, Peng LT, Kan SC, Liu YC, Shieh CJ. Lipase-immobilized biocatalytic membranes for biodiesel production. BIORESOURCE TECHNOLOGY 2013; 145:229-232. [PMID: 23357586 DOI: 10.1016/j.biortech.2012.12.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 12/10/2012] [Accepted: 12/11/2012] [Indexed: 06/01/2023]
Abstract
Microbial lipase from Candida rugosa (Amano AY-30) has good transesterification activity and can be used for biodiesel production. In this study, polyvinylidene fluoride (PVDF) membrane was grafted with 1,4-diaminobutane and activated by glutaraldehyde for C. rugosa lipase immobilization. After immobilization, the biocatalytic membrane was used for producing biodiesel from soybean oil and methanol via transesterification. Response Surface Methodology (RSM) in combination with a 5-level-5-factor central composite rotatable design (CCRD) was employed to evaluate the effects of reaction time, reaction temperature, enzyme amount, substrate molar ratio and water content on the yield of soybean oil methyl ester. By ridge max analysis, the predicted and experimental yields under the optimum synthesis conditions were 97% and 95%, respectively. The lipase-immobilized PVDF membrane showed good reuse ability for biodiesel production, enabling operation for at least 165 h during five reuses of the batch, without significant loss of activity.
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Affiliation(s)
- Chia-Hung Kuo
- Biotechnology Center, National Chung Hsing University, Taichung 402, Taiwan
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39
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Analytical Expressions for Steady-State Concentrations of Substrate and Oxidized and Reduced Mediator in an Amperometric Biosensor. INTERNATIONAL JOURNAL OF ELECTROCHEMISTRY 2013. [DOI: 10.1155/2013/812856] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A mathematical model of modified enzyme-membrane electrode for steady-state condition is discussed. This model contains a nonlinear term related to enzyme kinetics reaction mechanism. The thickness dependence of an amperometric biosensor is presented both analytically and numerically where the biological layer is immobilized between a solid substrate and permeable electrode. The analytical expressions pertaining to the concentration of species and normalized current are obtained using the Adomian decomposition method (ADM). Simple and approximate polynomial expressions of concentrations of an oxidized mediator, substrate, and reduced mediator are derived for all possible values of parametersϕO2(Thiele modulus),BO(normalized surface concentration of oxidized mediator), andBS(normalized surface concentration of substrate). A comparison of the analytical approximation and numerical simulation is also presented. A good agreement between theoretical predictions and numerical results is observed.
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40
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Qin Q, Hou Z, Lu X, Bian X, Chen L, Shen L, Wang S. Microfiltration membranes prepared from poly(N-vinyl-2-pyrrolidone) grafted poly(vinylidene fluoride) synthesized by simultaneous irradiation. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2012.09.059] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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41
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Xu C, Huang W, Lu X, Yan D, Chen S, Huang H. Preparation of PVDF porous membranes by using PVDF-g-PVP powder as an additive and their antifouling property. Radiat Phys Chem Oxf Engl 1993 2012. [DOI: 10.1016/j.radphyschem.2012.07.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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42
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Chen L, Hou Z, Lu X, Chen P, Liu Z, Shen L, Bian X, Qin Q. Antifouling microfiltration membranes prepared from poly(vinylidene fluoride)-graft-Poly(N- vinyl pyrrolidone) powders synthesized via pre-irradiation induced graft polymerization. J Appl Polym Sci 2012. [DOI: 10.1002/app.38625] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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43
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Graphene Oxide as a Matrix for the Immobilization of Glucose Oxidase. Appl Biochem Biotechnol 2012; 168:1635-42. [DOI: 10.1007/s12010-012-9884-4] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 08/28/2012] [Indexed: 10/27/2022]
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44
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Preparation and characterization of Ni(II)/polyacrylonitrile and carbon nanotube composite modified electrode and application for carbohydrates electrocatalytic oxidation. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1767-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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45
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Ashtari K, Khajeh K, Fasihi J, Ashtari P, Ramazani A, Vali H. Silica-encapsulated magnetic nanoparticles: Enzyme immobilization and cytotoxic study. Int J Biol Macromol 2012; 50:1063-9. [DOI: 10.1016/j.ijbiomac.2011.12.025] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Revised: 12/18/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
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46
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Luo X, Liu J, Liu G, Wang R, Liu Z, Li A. Manipulation of the bioactivity of glucose oxidase via raft‐controlled surface modification. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiong Luo
- College of Chemistry, Chemical and Environmental Engineering; Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
| | - Jingquan Liu
- College of Chemistry, Chemical and Environmental Engineering; Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
| | - Guozhen Liu
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Rui Wang
- College of Chemistry, Chemical and Environmental Engineering; Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
| | - Zhen Liu
- College of Chemistry, Chemical and Environmental Engineering; Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
| | - Aihua Li
- College of Chemistry, Chemical and Environmental Engineering; Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, China
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47
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Pekel N, Salih B, Güven O. Enhancement of stability of glucose oxidase by immobilization onto metal ion-chelated poly(N-vinyl imidazole) hydrogels. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 16:253-66. [PMID: 15794489 DOI: 10.1163/1568562053115453] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Poly(N-vinylimidazole), PVIm, gels were prepared by gamma-irradiation polymerization of N-vinylimidazole in aqueous solutions as an affinity gel for glucose oxidase (GOx). These affinity gels with a water swelling ratio of 1800% for plain polymeric gel and between 30-80% for Cu(II) and Co(II)-chelated gels at pH 6.0 in phosphate buffer were used in the GOx adsorption studies. Maximum metal ion adsorption capacity of these hydrogels was found to be 3.64 mmol/g dry gel for Cu(II) and 1.72 mmol/g dry gel for Co(II) leading to GOx adsorption capacities of 343 and 528 mg enzyme/g dry gel, respectively, as compared to 228 mg for the plain dry PVIm gel. Activity studies were carried out using plain and the metal ion-chelated form of this hydrogel to investigate the stability and retained activity of the GOx in different buffer solutions and at different temperatures. Activity of the enzyme, either in free or immobilized form on the gel, decreased dramatically in acetate buffer solutions. In phosphate buffer solution, however, stability of enzyme has been found to be significantly high reaching 90% retained activity at the end of a 40-day period at 4 degrees C for Co(II) chelated systems. After immobilization of the enzyme onto metal-chelated hydrogel, the thermal stability of enzyme was enhanced significantly showing 23% activity, even at 75 degrees C.
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Affiliation(s)
- Nursel Pekel
- Department of Chemistry, Hacettepe University, Beytepe, 06532 Ankara, Turkey
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48
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Mohy Eldin MS, El Enshasy HA, Hassan ME, Haroun B, Hassan EA. Covalent immobilization of penicillin G acylase onto amine-functionalized PVC membranes for 6-APA production from penicillin hydrolysis process. II. Enzyme immobilization and characterization. J Appl Polym Sci 2012. [DOI: 10.1002/app.36690] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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49
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Eldin MSM, El Enshasy HA, El Sayed M, El Sayed S, Haroun B, Hassan EA. Covalent immobilization of penicillin G acylase onto chemically activated surface of poly(vinyl chloride) membranes for 6-penicillic acid production from penicillin hydrolysis process I. Optimization of surface modification and its characterization. J Appl Polym Sci 2011. [DOI: 10.1002/app.35390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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A new immobilized glucose oxidase using SiO2 nanoparticles as carrier. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2011. [DOI: 10.1016/j.msec.2011.05.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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