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Wang C, Ji K, Jia W, Shao S, Liu Y, Jiang X, Yu L. Synthesis of Hydrophobically Associating Polymers with Natural Product Structures by a One‐Pot Method – Comparison of Ethanol Treatment and Freeze‐Drying. ChemistrySelect 2023. [DOI: 10.1002/slct.202300151] [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] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
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Liu H, Wang S, Shi H, Zhang R, Qu K, Hu Y, Qu X, Gan C, Chen J, Shi X, Zhang M, Zeng W. Gastric floating tablet improves the bioavailability and reduces the hypokalemia effect of gossypol in vivo. Saudi Pharm J 2021; 29:305-314. [PMID: 33994825 PMCID: PMC8093546 DOI: 10.1016/j.jsps.2021.03.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 03/01/2021] [Indexed: 11/16/2022] Open
Abstract
Gossypol (Gos) is a natural polyphenolic compound that has shown a number of valuable biological properties such as antifertility, antioxidation, and antitumor activities. However, the clinical application of Gos has been hindered by its notable adverse effects such as hypokalemia, hemolytic anemia, and so on. Using sustained-release dosage form provides a hopeful solution to this problem. In this study, a gastric floating tablet for sustained-release of Gos (Gos-GFT) was developed using polyvinylpyrrolidone, hydroxypropyl methyl cellulose, ethyl cellulose, lactose, sodium bicarbonate, and magnesium stearate. Gos-GFT had an average weight of around 200 mg with a drug content percentage of around 13.66%. The physicochemical properties of Gos-GFT satisfied the pharmacopoeial requirements for tablets. Gos-GFT was able to float in an acidic medium and had a sustained drug release for over 12 h. In vivo studies showed that the relative bioavailability of Gos-GFT, as compared with Gos powders, was larger than that of a non-gastric floating tablet which was a dosage form used for comparison with Gos-GFT. Furthermore, compared with the Gos powders and the non-gastric floating Gos tablets, Gos-GFT could prolong the in vivo action time of Gos, and significantly relieve hypokalemia which is a major adverse effect of Gos. These properties made Gos-GFT a promising Gos preparation that warrants further investigation for more extensive clinical applications of this natural compound.
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Affiliation(s)
- Hao Liu
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Sijiao Wang
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Houyin Shi
- Department of Orthopedics, The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Ruirui Zhang
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Kunyan Qu
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Yue Hu
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Xingyu Qu
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Chenyun Gan
- School of Clinical Medicine, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Jingjing Chen
- School of Clinical Medicine, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Xinyu Shi
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Mengwu Zhang
- School of Pharmacy, Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
| | - Weiling Zeng
- Department of Scientific Research, The Affiliated Traditional Chinese Medicine Hospital of Southwest Medical University, Luzhou City, Sichuan, People's Republic of China
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Scheiblbrandner S, Ludwig R. Cellobiose dehydrogenase: Bioelectrochemical insights and applications. Bioelectrochemistry 2019; 131:107345. [PMID: 31494387 DOI: 10.1016/j.bioelechem.2019.107345] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [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: 06/25/2019] [Revised: 08/01/2019] [Accepted: 08/01/2019] [Indexed: 12/17/2022]
Abstract
Cellobiose dehydrogenase (CDH) is a flavocytochrome with a history of bioelectrochemical research dating back to 1992. During the years, it has been shown to be capable of mediated electron transfer (MET) and direct electron transfer (DET) to a variety of electrodes. This versatility of CDH originates from the separation of the catalytic flavodehydrogenase domain and the electron transferring cytochrome domain. This uncoupling of the catalytic reaction from the electron transfer process allows the application of CDH on many different electrode materials and surfaces, where it shows robust DET. Recent X-ray diffraction and small angle scattering studies provided insights into the structure of CDH and its domain mobility, which can change between a closed-state and an open-state conformation. This structural information verifies the electron transfer mechanism of CDH that was initially established by bioelectrochemical methods. A combination of DET and MET experiments has been used to investigate the catalytic mechanism and the electron transfer process of CDH and to deduce a protein structure comprising of mobile domains. Even more, electrochemical methods have been used to study the redox potentials of the FAD and the haem b cofactors of CDH or the electron transfer rates. These electrochemical experiments, their results and the application of the characterised CDHs in biosensors, biofuel cells and biosupercapacitors are combined with biochemical and structural data to provide a thorough overview on CDH as versatile bioelectrocatalyst.
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Affiliation(s)
- Stefan Scheiblbrandner
- Biocatalysis and Biosensing Laboratory, Department of Food Science and Technology, BOKU - University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, 1190 Vienna, Austria.
| | - Roland Ludwig
- Biocatalysis and Biosensing Laboratory, Department of Food Science and Technology, BOKU - University of Natural Resources and Life Sciences, Vienna, Muthgasse 11, 1190 Vienna, Austria.
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Lopes A, Ferreira Filho E, Moreira L. An update on enzymatic cocktails for lignocellulose breakdown. J Appl Microbiol 2018; 125:632-645. [DOI: 10.1111/jam.13923] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 03/20/2018] [Accepted: 05/14/2018] [Indexed: 12/01/2022]
Affiliation(s)
- A.M. Lopes
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
| | - E.X. Ferreira Filho
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
| | - L.R.S. Moreira
- Laboratory of Enzymology; Department of Cellular Biology; University of Brasília; Brasilia DF Brazil
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Huber D, Tegl G, Mensah A, Beer B, Baumann M, Borth N, Sygmund C, Ludwig R, Guebitz GM. A Dual-Enzyme Hydrogen Peroxide Generation Machinery in Hydrogels Supports Antimicrobial Wound Treatment. ACS Appl Mater Interfaces 2017; 9:15307-15316. [PMID: 28429928 DOI: 10.1021/acsami.7b03296] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The aging population and accompanying diseases like diabetes resulted in an increased occurrence of chronic wounds. Topical wound treatment with antimicrobial agents to inhibit bacterial invasion and promote wound healing is often associated with difficulties. Here, we investigated the potential of succinyl chitosan (SC)-carboxymethyl cellulose (CMC) hydrogels which constantly release clinically relevant levels of hydrogen peroxide (H2O2). CMC hydrogel matrix was in situ converted by limited hydrolysis by a cellulase into substrates accepted by cellobiose dehydrogenase (CDH) for continuous production of H2O2 (30 μM over 24 h). This dual-enzyme catalyzed in situ H2O2 generation system proved its antimicrobial activity in a zone of inhibition (ZOI) assay best simulating the application as wound dressing and was found to be biocompatible toward mouse fibroblasts (95% viability). The hydrogels were thoroughly characterized regarding their rheological properties indicating fast gel formation (<3 min) and moderate cross-linking (1.5% strain, G' = 10 Pa). Cooling (fridge conditions) was found to be the simple on/off switch of the enzymatic machinery which is of great importance regarding storage and applicability of the bioactive hydrogel. This robust and bioactive antimicrobial hydrogel system overcomes dosing issues of common topical wound treatments and constitutes a promising wound healing approach for the future.
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Affiliation(s)
- Daniela Huber
- Institute of Environmental Biotechnology, BOKU-University of Natural Resources and Life Sciences , Konrad Lorenz Straße 20, 3430 Tulln an der Donau, Austria
| | - Gregor Tegl
- Institute of Environmental Biotechnology, BOKU-University of Natural Resources and Life Sciences , Konrad Lorenz Straße 20, 3430 Tulln an der Donau, Austria
| | - Anna Mensah
- Institute of Environmental Biotechnology, BOKU-University of Natural Resources and Life Sciences , Konrad Lorenz Straße 20, 3430 Tulln an der Donau, Austria
| | - Bianca Beer
- Institute of Environmental Biotechnology, BOKU-University of Natural Resources and Life Sciences , Konrad Lorenz Straße 20, 3430 Tulln an der Donau, Austria
| | - Martina Baumann
- ACIB-Austrian Centre of Industrial Biotechnology , Konrad Lorenz Straße 20, 3430 Tulln, Austria
| | - Nicole Borth
- ACIB-Austrian Centre of Industrial Biotechnology , Konrad Lorenz Straße 20, 3430 Tulln, Austria
- Department of Biotechnology, University of Natural Resources and Life Sciences (BOKU) , Muthgasse 18, 1190 Vienna, Austria
| | - Christoph Sygmund
- Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences , Muthgasse 18, 1190 Vienna, Austria
| | - Roland Ludwig
- Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences , Muthgasse 18, 1190 Vienna, Austria
| | - Georg M Guebitz
- Institute of Environmental Biotechnology, BOKU-University of Natural Resources and Life Sciences , Konrad Lorenz Straße 20, 3430 Tulln an der Donau, Austria
- ACIB-Austrian Centre of Industrial Biotechnology , Konrad Lorenz Straße 20, 3430 Tulln, Austria
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Lopez F, Ma S, Ludwig R, Schuhmann W, Ruff A. A Polymer Multilayer Based Amperometric Biosensor for the Detection of Lactose in the Presence of High Concentrations of Glucose. ELECTROANAL 2017; 29:154-61. [DOI: 10.1002/elan.201600575] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kielb P, Sezer M, Katz S, Lopez F, Schulz C, Gorton L, Ludwig R, Wollenberger U, Zebger I, Weidinger IM. Spectroscopic Observation of Calcium-Induced Reorientation of Cellobiose Dehydrogenase Immobilized on Electrodes and its Effect on Electrocatalytic Activity. Chemphyschem 2015; 16:1960-8. [PMID: 25908116 DOI: 10.1002/cphc.201500112] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [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: 02/09/2015] [Revised: 03/12/2015] [Indexed: 12/31/2022]
Abstract
Cellobiose dehydrogenase catalyzes the oxidation of various carbohydrates and is considered as a possible anode catalyst in biofuel cells. It has been shown that the catalytic performance of this enzyme immobilized on electrodes can be increased by presence of calcium ions. To get insight into the Ca(2+) -induced changes in the immobilized enzyme we employ surface-enhanced vibrational (SERR and SEIRA) spectroscopy together with electrochemistry. Upon addition of Ca(2+) ions electrochemical measurements show a shift of the catalytic turnover signal to more negative potentials while SERR measurements reveal an offset between the potential of heme reduction and catalytic current. Comparing SERR and SEIRA data we propose that binding of Ca(2+) to the heme induces protein reorientation in a way that the electron transfer pathway of the catalytic FAD center to the electrode can bypass the heme cofactor, resulting in catalytic activity at more negative potentials.
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Affiliation(s)
- Patrycja Kielb
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
| | - Murat Sezer
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
| | - Sagie Katz
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
| | - Francesca Lopez
- Department of Biochemistry and Structural Biology, Lund University, PO Box 124, 221 00 Lund (Sweden)
| | - Christopher Schulz
- Department of Biochemistry and Structural Biology, Lund University, PO Box 124, 221 00 Lund (Sweden)
| | - Lo Gorton
- Department of Biochemistry and Structural Biology, Lund University, PO Box 124, 221 00 Lund (Sweden)
| | - Roland Ludwig
- Department of Food Science and Technology, BOKU - University of Natural Resources and Life Science, Muthgasse 18, 1190 Vienna (Austria)
| | - Ulla Wollenberger
- Institüt für Biochemie und Biologie, Universität Potsdam, Karl Liebknecht Strasse 24-25, 14476 Golm (Germany)
| | - Ingo Zebger
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany)
| | - Inez M Weidinger
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany).
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Fischer C, Krause A, Kleinschmidt T. Optimization of production, purification and lyophilisation of cellobiose dehydrogenase by Sclerotium rolfsii. BMC Biotechnol 2014; 14:97. [PMID: 25407159 PMCID: PMC4241217 DOI: 10.1186/s12896-014-0097-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 10/30/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The enzyme cellobiose dehydrogenase (CDH) can be used to oxidize lactose to lactobionic acid. As Sclerotium rolfsii is known to be a good producer of CDH, the aim of this paper was to simplify its production and secondly to systematically study its purification aiming for a high yield. Two preservation methods (freezing and freeze-drying) and the influence of several protectants were investigated. RESULTS Production of cellobiose dehydrogenase was optimized leading to a more simplified medium composition. Purification of the enzyme was evaluated by determining breakthrough profiles on different ion exchange (IEX) and hydrophobic interaction (HIC) materials with regard to buffer composition. Highest purification with an acceptable loss during the capture step using IEX was obtained with a Q Sepharose XL medium and a 100 mM sodium acetate buffer at pH 4.5. Subsequent purification using hydrophobic interaction chromatography was done at 1.1 M ammonium sulfate concentration. Purification was moderate, yielding a specific activity of 11.9 U/mg (56% yield). However, as could be shown in a preliminary experiment, purity of the obtained enzyme solution was sufficient for its intended use to oxidize lactose to lactobionic acid. Various sugars and sugar alcohols were investigated to study their protective effect during lyophilisation and freezing at -20 °C. Glucose and lactulose could be identified to have a high lyoprotective effect while loss of enzyme activity was high (77%) when using no additives. CONCLUSION By simplifying the cultivation medium of Sclerotium rolfsii, the costs of cellobiose dehydrogenase production could be reduced. Simultaneously, CDH production was increased by 21%. The production of lactobionic acid from lactose is possible using partially purified and unpurified enzyme. Storage at -20 °C using 50% (w/v) glycerol was considered to be most suited for preservation of the enzyme.
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Affiliation(s)
- Christin Fischer
- Anhalt University of Applied Sciences, Department of Applied Biosciences and Process Engineering, Bernburger Str. 55, 06366, Köthen, Germany.
| | - Annett Krause
- Anhalt University of Applied Sciences, Department of Applied Biosciences and Process Engineering, Bernburger Str. 55, 06366, Köthen, Germany.
| | - Thomas Kleinschmidt
- Anhalt University of Applied Sciences, Department of Applied Biosciences and Process Engineering, Bernburger Str. 55, 06366, Köthen, Germany.
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Yarman A, Schulz C, Sygmund C, Ludwig R, Gorton L, Wollenberger U, Scheller FW. Third Generation ATP Sensor with Enzymatic Analyte Recycling. ELECTROANAL 2014. [DOI: 10.1002/elan.201400231] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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