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Miranda FC, Oliveira KSGC, Tardioli PW, Fernandez-Lafuente R, Guimarães JR. Insights on the role of blocking agent on the properties of the lipase from Thermomyces lanuginosus immobilized on heterofunctional support for hydroesterification reactions. Int J Biol Macromol 2024; 275:133555. [PMID: 38960240 DOI: 10.1016/j.ijbiomac.2024.133555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 06/06/2024] [Accepted: 06/27/2024] [Indexed: 07/05/2024]
Abstract
Here, we report a study of the effect of the blocking agent on the properties of the lipase from Thermomyces lanuginosus (TLL) immobilized on a heterofunctional support (Purolite C18-ethylnediamina (EDA)- vinyl sulfone (VS)-TLL-blocking agent) in different reactions. The performance of the biocatalysts was compared to those immobilized on standard hydrophobic support (Purolite C18-TLL) and the commercial one (TLL-IM). The nature of the blocking agent (Cys, Gly and Asp) altered the enzyme features. TLL-IM always gave a comparatively worse performance, with its specificity for the oil being very different to the Purolite biocatalysts. Under optimized conditions, Purolite C18-TLL yielded 97 % of hydrolysis conversion after 4 h using a water/waste cooking soybean oil (WCSO) mass ratio of 4.3, biocatalyst load of 6.5 wt% and a temperature of 44.2 °C (without buffer or emulsification agent). In esterification reactions of the purified free fatty acids (FFAs) obtained from WCSO, the best TLL biocatalysts depended on the utilized alcohol: linear amyl alcohol was preferred by Purolite C18-TLL and Purolite C18-EDA-VS-TLL-Gly, while higher activity was achieved utilizing isoamyl alcohol as nucleophile by Purolite C18-EDA-VS-TLL-Cys, Purolite C18-EDA-VS-TLL-Asp and IM-TLL as catalysts. All the results indicate the influence of the blocking step on the final biocatalyst features.
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Affiliation(s)
- Felipe Cardoso Miranda
- Institute of Natural Resources, Federal University of Itajubá, Av. Benedito Pereira dos Santos, 1303, Itajubá, Minas Gerais 37500-903, Brazil
| | | | - Paulo Waldir Tardioli
- Department of Chemical Engineering, Federal Institute of Education, Science and Technology of the South of Minas Gerais, Av. Maria da Conceição Santos, 900, 37560-260 Pouso Alegre, Minas Gerais, Brazil
| | - Roberto Fernandez-Lafuente
- Department of biocatalysis, Institute of Catalysis and Petrochemistry (ICP-CSIC), Campus UAM -CSIC, 28049 Madrid, Spain.
| | - José Renato Guimarães
- Institute of Natural Resources, Federal University of Itajubá, Av. Benedito Pereira dos Santos, 1303, Itajubá, Minas Gerais 37500-903, Brazil.
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2
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Morellon-Sterling R, Tavano O, Bolivar JM, Berenguer-Murcia Á, Vela-Gutiérrez G, Sabir JSM, Tacias-Pascacio VG, Fernandez-Lafuente R. A review on the immobilization of pepsin: A Lys-poor enzyme that is unstable at alkaline pH values. Int J Biol Macromol 2022; 210:682-702. [PMID: 35508226 DOI: 10.1016/j.ijbiomac.2022.04.224] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 04/28/2022] [Accepted: 04/29/2022] [Indexed: 11/05/2022]
Abstract
Pepsin is a protease used in many different applications, and in many instances, it is utilized in an immobilized form to prevent contamination of the reaction product. This enzyme has two peculiarities that make its immobilization complex. The first one is related to the poor presence of primary amino groups on its surface (just one Lys and the terminal amino group). The second one is its poor stability at alkaline pH values. Both features make the immobilization of this enzyme to be considered a complicated goal, as most of the immobilization protocols utilize primary amino groups for immobilization. This review presents some of the attempts to get immobilized pepsin biocatalyst and their applications. The high density of anionic groups (Asp and Glu) make the anion exchange of the enzyme simpler, but this makes many of the strategies utilized to immobilize the enzyme (e.g., amino-glutaraldehyde supports) more related to a mixed ion exchange/hydrophobic adsorption than to real covalent immobilization. Finally, we propose some possibilities that can permit not only the covalent immobilization of this enzyme, but also their stabilization via multipoint covalent attachment.
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Affiliation(s)
- Roberto Morellon-Sterling
- Departamento de Biocatálisis, ICP-CSIC, Marie Curie 2, Campus UAM-CSIC Cantoblanco, 28049 Madrid, Spain; Student of Departamento de Biología Molecular, Universidad Autónoma de Madrid, Darwin 2, Campus UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Olga Tavano
- Faculty of Nutrition, Alfenas Federal Univ., 700 Gabriel Monteiro da Silva St, Alfenas, MG 37130-000, Brazil
| | - Juan M Bolivar
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Ave., Madrid 28040, Spain
| | - Ángel Berenguer-Murcia
- Departamento de Química Inorgánica e Instituto Universitario de Materiales, Universidad de Alicante, Alicante, Spain
| | - Gilber Vela-Gutiérrez
- Facultad de Ciencias de la Nutrición y Alimentos, Universidad de Ciencias y Artes de Chiapas, Lib. Norte Pte. 1150, 29039 Tuxtla Gutiérrez, Chiapas, Mexico
| | - Jamal S M Sabir
- Centre of Excellence in Bionanoscience Research, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Veymar G Tacias-Pascacio
- Facultad de Ciencias de la Nutrición y Alimentos, Universidad de Ciencias y Artes de Chiapas, Lib. Norte Pte. 1150, 29039 Tuxtla Gutiérrez, Chiapas, Mexico; Tecnológico Nacional de México, Instituto Tecnológico de Tuxtla Gutiérrez, Carretera Panamericana Km. 1080, 29050 Tuxtla Gutiérrez, Chiapas, Mexico.
| | - Roberto Fernandez-Lafuente
- Departamento de Biocatálisis, ICP-CSIC, Marie Curie 2, Campus UAM-CSIC Cantoblanco, 28049 Madrid, Spain; Center of Excellence in Bionanoscience Research, External Scientific Advisory Academics, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
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3
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Aggarwal S, Ikram S. Zinc oxide nanoparticles-impregnated chitosan surfaces for covalent immobilization of trypsin: Stability & kinetic studies. Int J Biol Macromol 2022; 207:205-221. [PMID: 35259431 DOI: 10.1016/j.ijbiomac.2022.03.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/31/2022] [Accepted: 03/03/2022] [Indexed: 11/25/2022]
Abstract
Trypsin (Try, EC. 3.4.21.4) was effectively immobilized on the surface of glutaraldehyde(GA)-activated ZnO/Chitosan nanocomposite through covalent attachment via Schiff-base linkages. Size, structure, surface morphology, & percentage elemental composition of the prepared ZnO nanoparticles and chitosan-coated ZnO nanocomposite were studied by UV-Visible spectroscopy, Fourier-transform infrared spectroscopy (FTIR), X-Ray diffraction analysis (XRD), transmission electron microscopy (TEM), Scanning electron microscopy (SEM), and Energy-Dispersive X-Ray Microanalysis (EDAX) techniques. Optimal immobilization conditions (incubation time (16 h), enzyme concentration (1.8 mg/ml), and pH (7.8)) were investigated to obtain the maximum expressed activity of the immobilized trypsin. Immobilized & solubilized trypsin exhibited the optimum catalytic activity at pH 8.5, 60 °C, and pH 7.8, 45 °C respectively. Kinetic parameters (Km, Vmax) of immobilized (27.12 μM, 8.82 μM/min) & free trypsin (25.76 μM, 4.16 μM/min) were determined, indicating that efficiency of trypsin improves after immobilization. Immobilized trypsin preserved 67% of initial activity at 50 °C during 2 h of incubation & sustained nearly 50% of catalytic activity until the 9th repeated cycle of utilization. Moreover, immobilized trypsin retained 50% of enzymatic activity after 90 days of storage at 4 °C. Hence, the current findings suggest that ZnO/Chitosan-GA-Trypsin would be a promising biocatalyst for large-scale biotechnological applications.
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Affiliation(s)
- Shalu Aggarwal
- Bio/Polymers Research Laboratory, Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Saiqa Ikram
- Bio/Polymers Research Laboratory, Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110025, India.
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Rodrigues RC, Berenguer-Murcia Á, Carballares D, Morellon-Sterling R, Fernandez-Lafuente R. Stabilization of enzymes via immobilization: Multipoint covalent attachment and other stabilization strategies. Biotechnol Adv 2021; 52:107821. [PMID: 34455028 DOI: 10.1016/j.biotechadv.2021.107821] [Citation(s) in RCA: 222] [Impact Index Per Article: 74.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/26/2021] [Accepted: 08/21/2021] [Indexed: 12/22/2022]
Abstract
The use of enzymes in industrial processes requires the improvement of their features in many instances. Enzyme immobilization, a requirement to facilitate the recovery and reuse of these water-soluble catalysts, is one of the tools that researchers may utilize to improve many of their properties. This review is focused on how enzyme immobilization may improve enzyme stability. Starting from the stabilization effects that an enzyme may experience by the mere fact of being inside a solid particle, we detail other possibilities to stabilize enzymes: generation of favorable enzyme environments, prevention of enzyme subunit dissociation in multimeric enzymes, generation of more stable enzyme conformations, or enzyme rigidification via multipoint covalent attachment. In this last point, we will discuss the features of an "ideal" immobilization protocol to maximize the intensity of the enzyme-support interactions. The most interesting active groups in the support (glutaraldehyde, epoxide, glyoxyl and vinyl sulfone) will be also presented, discussing their main properties and uses. Some instances in which the number of enzyme-support bonds is not directly related to a higher stabilization will be also presented. Finally, the possibility of coupling site-directed mutagenesis or chemical modification to get a more intense multipoint covalent immobilization will be discussed.
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Affiliation(s)
- Rafael C Rodrigues
- Biocatalysis and Enzyme Technology Lab, Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, P.O. Box 15090, Porto Alegre, RS, Brazil
| | | | - Diego Carballares
- Departamento de Biocatálisis, ICP-CSIC, Campus UAM-CSIC Cantoblanco, Madrid, Spain
| | | | - Roberto Fernandez-Lafuente
- Departamento de Biocatálisis, ICP-CSIC, Campus UAM-CSIC Cantoblanco, Madrid, Spain; Center of Excellence in Bionanoscience Research, External Scientific Advisory Academics, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
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Dal Magro L, Kornecki JF, Klein MP, Rodrigues RC, Fernandez-Lafuente R. Optimized immobilization of polygalacturonase from Aspergillus niger following different protocols: Improved stability and activity under drastic conditions. Int J Biol Macromol 2019; 138:234-243. [DOI: 10.1016/j.ijbiomac.2019.07.092] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/05/2019] [Accepted: 07/13/2019] [Indexed: 12/22/2022]
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6
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Rodrigues RC, Virgen-Ortíz JJ, dos Santos JC, Berenguer-Murcia Á, Alcantara AR, Barbosa O, Ortiz C, Fernandez-Lafuente R. Immobilization of lipases on hydrophobic supports: immobilization mechanism, advantages, problems, and solutions. Biotechnol Adv 2019; 37:746-770. [DOI: 10.1016/j.biotechadv.2019.04.003] [Citation(s) in RCA: 287] [Impact Index Per Article: 57.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 04/02/2019] [Accepted: 04/03/2019] [Indexed: 12/13/2022]
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7
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de Andrades D, Graebin NG, Ayub MAZ, Fernandez-Lafuente R, Rodrigues RC. Preparation of immobilized/stabilized biocatalysts of β-glucosidases from different sources: Importance of the support active groups and the immobilization protocol. Biotechnol Prog 2019; 35:e2890. [PMID: 31374157 DOI: 10.1002/btpr.2890] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/22/2019] [Accepted: 07/26/2019] [Indexed: 11/07/2022]
Abstract
β-Glucosidases from two different commercial preparations, Pectinex Ultra SP-L and Celluclast® 1.5L, were immobilized on divinylsulfone (DVS) supports at pH 5.0, 7.0, 9.0, and 10. In addition, the biocatalysts were also immobilized in agarose beads activated by glyoxyl, and epoxide as reagent groups. The best immobilization results were observed using higher pH values on DVS-agarose, and for Celluclast® 1.5L, good results were also obtained using the glyoxil-agarose immobilization. The biocatalyst obtained using Pectinex Ultra SP-L showed the highest thermal stability, at 65°C, and an operational stability of 67% of activity after 10 reuses cycles when immobilized on DVS-agarose immobilized at pH 10 and blocked with ethylenediamine. The β-glucosidase from Celluclast® 1.5L produced best results when immobilized on DVS-agarose immobilized at pH 9 and blocked with glycine, reaching 7.76-fold higher thermal stability compared to its free form and maintaining 76% of its activity after 10 successive cycles. The new biocatalysts obtained by these protocols showed reduction of glucose inhibition of enzymes, demonstrating the influence of immobilization protocols, pH, and blocking agent.
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Affiliation(s)
- Diandra de Andrades
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Natália G Graebin
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Marco A Z Ayub
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Rafael C Rodrigues
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
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8
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Pinheiro BB, Rios NS, Rodríguez Aguado E, Fernandez-Lafuente R, Freire TM, Fechine PB, dos Santos JC, Gonçalves LR. Chitosan activated with divinyl sulfone: a new heterofunctional support for enzyme immobilization. Application in the immobilization of lipase B from Candida antarctica. Int J Biol Macromol 2019; 130:798-809. [DOI: 10.1016/j.ijbiomac.2019.02.145] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/19/2019] [Accepted: 02/24/2019] [Indexed: 10/27/2022]
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9
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Szałapata K, Osińska-Jaroszuk M, Bryjak J, Jaszek M, Jarosz-Wilkołazka A. NOVEL APPLICATION OF POROUS AND CELLULAR MATERIALS FOR COVALENT IMMOBILIZATION OF PEPSIN. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2016. [DOI: 10.1590/0104-6632.20160332s20140111] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
| | | | - J. Bryjak
- Wroclaw University of Technology, Poland
| | - M. Jaszek
- Maria Curie-Sklodowska University, Poland
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10
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Covalently immobilized lipase on aminoalkyl-, carboxy- and hydroxy-multi-wall carbon nanotubes in the enantioselective synthesis of Solketal esters. Enzyme Microb Technol 2016; 87-88:61-9. [DOI: 10.1016/j.enzmictec.2016.02.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 02/15/2016] [Accepted: 02/29/2016] [Indexed: 11/23/2022]
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11
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Santos-Moriano P, Monsalve-Ledesma L, Ortega-Muñoz M, Fernandez-Arrojo L, Ballesteros AO, Santoyo-Gonzalez F, Plou FJ. Vinyl sulfone-activated silica for efficient covalent immobilization of alkaline unstable enzymes: application to levansucrase for fructooligosaccharide synthesis. RSC Adv 2016. [DOI: 10.1039/c6ra14046g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Vinyl sulfone-silica was efficient to covalently immobilize levansucrase at neutral pH. LEV-VS showed altered selectivity towards FOS and good operational stability.
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Affiliation(s)
| | | | | | | | | | | | - F. J. Plou
- Instituto de Catalisis y Petroleoquimica
- CSIC
- 28049 Madrid
- Spain
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12
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13
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dos Santos JC, Rueda N, Barbosa O, Millán-Linares MDC, Pedroche J, del Mar Yuste M, Gonçalves LR, Fernandez-Lafuente R. Bovine trypsin immobilization on agarose activated with divinylsulfone: Improved activity and stability via multipoint covalent attachment. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcatb.2015.04.008] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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dos Santos JC, Rueda N, Torres R, Barbosa O, Gonçalves LR, Fernandez-Lafuente R. Evaluation of divinylsulfone activated agarose to immobilize lipases and to tune their catalytic properties. Process Biochem 2015. [DOI: 10.1016/j.procbio.2015.03.018] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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15
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Sun X, Cai X, Wang RQ, Xiao J. Immobilized trypsin on hydrophobic cellulose decorated nanoparticles shows good stability and reusability for protein digestion. Anal Biochem 2015; 477:21-7. [DOI: 10.1016/j.ab.2015.02.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 02/07/2015] [Accepted: 02/09/2015] [Indexed: 01/25/2023]
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16
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Atacan K, Özacar M. Characterization and immobilization of trypsin on tannic acid modified Fe3O4 nanoparticles. Colloids Surf B Biointerfaces 2015; 128:227-236. [DOI: 10.1016/j.colsurfb.2015.01.038] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 01/01/2015] [Accepted: 01/23/2015] [Indexed: 10/24/2022]
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dos Santos JCS, Rueda N, Sanchez A, Villalonga R, Gonçalves LRB, Fernandez-Lafuente R. Versatility of divinylsulfone supports permits the tuning of CALB properties during its immobilization. RSC Adv 2015. [DOI: 10.1039/c5ra03798k] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Properties of CALB has been modulated by immobilization on divinylsulfone (DVS) activated agarose beads under different conditions (pH 5–10).
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Affiliation(s)
| | - Nazzoly Rueda
- Departamento de Biocatálisis
- Instituto de Catálisis-CSIC
- ICP-CSIC
- 28049 Madrid
- Spain
| | - Alfredo Sanchez
- Department of Analytical Chemistry
- Faculty of Chemistry
- Complutense University of Madrid
- 28040 Madrid
- Spain
| | - Reynaldo Villalonga
- Department of Analytical Chemistry
- Faculty of Chemistry
- Complutense University of Madrid
- 28040 Madrid
- Spain
| | - Luciana R. B. Gonçalves
- Departamento de Engenharia Química
- Universidade Federal do Ceará
- Campus do Pici
- Fortaleza
- Brazil
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18
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dos Santos JCS, Rueda N, Barbosa O, Fernández-Sánchez JF, Medina-Castillo AL, Ramón-Márquez T, Arias-Martos MC, Millán-Linares MC, Pedroche J, Yust MDM, Gonçalves LRB, Fernandez-Lafuente R. Characterization of supports activated with divinyl sulfone as a tool to immobilize and stabilize enzymes via multipoint covalent attachment. Application to chymotrypsin. RSC Adv 2015. [DOI: 10.1039/c4ra16926c] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
DVS supports are very suitable to stabilize enzymes via multipoint covalent attachment.
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Affiliation(s)
| | - Nazzoly Rueda
- ICP-CSIC
- Departamento de Biocatálisis
- Instituto de Catálisis-CSIC
- 28049 Madrid
- Spain
| | - Oveimar Barbosa
- Facultad de Ciencias
- Departamento de Química
- Universidad del Tolima
- Ibagué
- Colombia
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Peng G, Zhao C, Liu B, Sun Z, Luo R. Chitosan Modified PSt-GMA Microspheres With/Without Spacer-Arms as Carriers: Their Influences on Kinetics, Stability, Optimal pH, Adsorption Behavior of Immobilized Trypsin. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2012. [DOI: 10.1080/10601325.2012.714678] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Rekuć A, Bryjak J, Szymańska K, Jarzębski AB. Laccase immobilization on mesostructured cellular foams affords preparations with ultra high activity. Process Biochem 2009. [DOI: 10.1016/j.procbio.2008.10.007] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Gai L, Wu D. A Novel Reversible pH-Triggered Release Immobilized Enzyme System. Appl Biochem Biotechnol 2008; 158:747-60. [DOI: 10.1007/s12010-008-8373-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Accepted: 09/15/2008] [Indexed: 11/29/2022]
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