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Elegbede JA, Lateef A, Gueguim-Kana EB, Beukes LS, Matyumza N. Multi-functional xylanase from Aspergillus sydowii: biosynthesis of nanoconjugates, optimization by Taguchi approach and biodeinking potential. Prep Biochem Biotechnol 2024; 54:622-636. [PMID: 37772603 DOI: 10.1080/10826068.2023.2261037] [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] [Indexed: 09/30/2023]
Abstract
The search for effective production of xylanase which is an important industrial enzyme led to the present study that explored xylanase production by Aspergillus sydowii SF through Taguchi optimization that incorporated nanoconjugates in submerged fermentation. Calcium and zinc oxide nanoconjugates biosynthesized by xylanase were characterized via UV-Vis spectroscopy, Fourier transform infrared spectroscopy, and Transmission electron microscopy (TEM). The xylanase-mediated calcium oxide and zinc oxide nanoconjugates with λmax of 374 and 316 nm, respectively, and were 5.32-17.69 nm in size. Xylanase production was improved by 2.90-10.58 folds (64.24-234.15 U/mL) through Taguchi optimization cum nanoconjugates, and ANOVA showed that nanoconjugates contributed 13.62-65.97% to improved production. The xylanase had up to 88.38% deinking activity, with 49.60-84.64% removal of blue color. The remarkable xylanase production, its use to biosynthesize nanoconjugates and biodeinking potentials contribute to the development of versatile biocatalysts with applications in biotechnology, nanotechnology, and sustainable paper production. To the best of our knowledge, this represents the first report of xylanase for biosynthesis of calcium oxide and zinc oxide nanoparticles, as well as nanosupplementation to induce xylanase production, which can open new vista in bioprocess optimization.
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Affiliation(s)
- J A Elegbede
- Laboratory of Industrial Microbiology and Nanobiotechnology, Department of Pure and Applied Biology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | - A Lateef
- Laboratory of Industrial Microbiology and Nanobiotechnology, Department of Pure and Applied Biology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
- Nanotechnology Research Group (NANO+), Laboratory of Industrial Microbiology and Nanobiotechnology, Department of Pure and Applied Biology, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
| | - E B Gueguim-Kana
- Department of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Scottsville, PieterMaritzburg, South Africa
| | - L S Beukes
- Department of Microbiology, School of Life Sciences, University of KwaZulu-Natal, Scottsville, PieterMaritzburg, South Africa
| | - N Matyumza
- Microscopy and Microanalysis Unit, School of Life Sciences, University of KwaZulu-Natal, Scottsville, PieterMaritzburg, South Africa
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Ketsakhon P, Thammasittirong A, Thammasittirong SNR. Adding value to rice straw waste for high-level xylanase production using a new isolate of Bacillus altitudinis RS3025. Folia Microbiol (Praha) 2023; 68:87-99. [PMID: 35945409 DOI: 10.1007/s12223-022-00998-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 07/27/2022] [Indexed: 11/04/2022]
Abstract
An investigation was carried out using rice straw as a low-cost substrate to study the optimization of xylanase production using a newly identified endospore-forming bacterium, Bacillus altitudinis RS3025. The highest xylanase activity was achieved using 2% rice straw (pretreated with 2% NaOH at 100 °C) at pH 7.0, 37 °C temperature, and with 72-h incubation time. Under the optimized conditions, xylanase activity reached 2518.51 U/mL, which was 11.56-fold higher than the activity under the initial conditions using untreated rice straw as substrate. Enzymatic hydrolysis of the rice straw using crude xylanase of B. altitudinis RS3025 demonstrated the hydrolyzation efficiency of the rice straw waste, especially alkaline rice straw. The highest level of released reducing sugars was 149.78 mg/g substrate. The study demonstrated the successful utilization of rice straw waste for high-level xylanase production using B. altitudinis RS3025 and reducing sugar production using low-cost crude enzyme, which has the advantages of reducing the processing cost and environmental concerns associated with rice straw waste management.
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Affiliation(s)
- Punpaporn Ketsakhon
- Department of Microbiology, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand
| | - Anon Thammasittirong
- Department of Microbiology, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand.,Microbial Biotechnology Unit, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand
| | - Sutticha Na-Ranong Thammasittirong
- Department of Microbiology, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand. .,Microbial Biotechnology Unit, Faculty of Liberal Arts and Science, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom, 73140, Thailand.
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Omisore SO, Fabunmi TB, Ayodeji AO, Olaniyi OO, Arotupin DJ. Production and biochemical characterization of partially purified cellulase-free, thermo-acidophilic endoxylanase from Lysinibacillus fusiformis strain TB7 using kolanut husk as feedstock. Heliyon 2022; 8:e11106. [PMID: 36281386 PMCID: PMC9586915 DOI: 10.1016/j.heliyon.2022.e11106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 03/25/2022] [Accepted: 10/11/2022] [Indexed: 10/29/2022] Open
Abstract
Xylanases have become very important enzymes in many industrial processes for the valorization of xylan-rich lignocellulosic wastes. Here, some physicochemical and kinetic properties of a purified endoxylanase produced on kolanut husk-based medium by Lysinibacillus fusiformis are presented. The crude enzyme solution was first subjected to precipitation with solid ammonium sulphate and further purified on DEAE-Sephadex A-50 anion-exchange and Sephadex G-100 gel filtration columns chromatography prior to biochemical characterization. The purified endoxylanase was 21 kDa as determined by sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE) and was thermostable, exhibiting optimum activity at 60 °C and pH 5.0. The K m and V max were respectively estimated to be 29.5 mg/ml and 125 μmol/min/ml using Birchwood xylan as substrate. Activity of the enzyme was enhanced by Na+, Ca2+, Mn2+, Mg2+ and K+ at concentration of 5 mM but inhibited by Hg2+, Cu2+, Pb2+, Fe3+, EDTA, SDS and Urea. The purified endoxylanase showed high hydrolytic activity on Birchwood xylan and kolanut husk but extremely poor or no activity on carboxymethyl cellulose, starch or pectin. This L. fusiformis strain TB7 endoxylanase has desirable properties useful for biotechnological applications in laundry, fuels, feeds, paper and pulp industries.
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Affiliation(s)
| | - Temitope Bukola Fabunmi
- Department of Microbiology, Federal University of Technology, P.M.B. 704, Akure, Nigeria
- Department of Biological Sciences, Achievers University, P.M.B. 001, Owo, Nigeria
| | - Adeyemi Oluwadare Ayodeji
- Department of Biochemistry, Federal University of Technology, P.M.B. 704, Akure, Nigeria
- Department of Chemical Sciences, Biochemistry Unit, Joseph Ayo Babalola University, Ikeji-Arakeji, P.M.B. 5006, Ilesha, Nigeria
| | | | - Daniel Juwon Arotupin
- Department of Microbiology, Federal University of Technology, P.M.B. 704, Akure, Nigeria
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Agrawal S, Nagpal R, Sharma D, Bhardwaj N, Mahajan R. An eco-friendly biocatalytic process for producing better quality paper from sugarcane bagasse using ultrafiltered enzymes concoction. Bioprocess Biosyst Eng 2022; 45:741-747. [PMID: 35113232 DOI: 10.1007/s00449-022-02695-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 01/17/2022] [Indexed: 11/30/2022]
Abstract
In the current study, pretreatment of sugarcane bagasse has been carried out with ultrafiltered xylano-pectinolytic enzymes, before conventional chemical bleaching process. Optimized enzymatic dose (4 IU xylanase and 1.2 IU pectinase per g of oven dried pulp) and retention time (180 min) were determined on the basis of maximum decrement in kappa number (from 20.93 to 15.32), release of maximum sugars (7.4 mg/g) as well as attainment of maximum brightness (25.1% ISO), whiteness (from - 57.3 to - 41.9) and minimum yellowness (from 48.7 to 35.3) of the pulp samples. Enzymatically treated samples also showed release of phenolic, lignin and hydrophobic compounds in their filtrates. Nearly 30% decrement in the exhaustion of bleaching chemical dose was detected as compared to control samples. The physical properties such as tear index, burst index, double fold number, breaking length, gurley porosity and viscosity of enzymo-chemically treated bagasse pulp samples were improved by 6.68%, 33.86%, 22.92%, 13.43%, 17.5% and 9.64%, respectively. Additionally, a decrement of 36.75% and 28.29% in the values of BOD and COD of the effluents was also noted, which demonstrated the fact that, inclusion of enzymes in chemical based protocols of paper and pulp industries could be a highly beneficial and eco-friendly approach in upcoming decades. This is the first report mentioning the effect of ultrafiltered xylano-pectinolytic enzymes concoction on sugarcane bagasse pulp.
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Affiliation(s)
- Sharad Agrawal
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India.,Department of Life Sciences, Sharda University, Greater Noida, India
| | - Raksha Nagpal
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India
| | - Divya Sharma
- Department of Life Sciences, IAMR College, Ghaziabad, India
| | - Nishikant Bhardwaj
- Avantha Centre for Industrial Research and Development, Paper Mill Campus, Yamuna Nagar, India
| | - Ritu Mahajan
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India.
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Bankeeree W, Prasongsuk S, Lotrakul P, Abd‐Aziz S, Punnapayak H. Enzymes for Hemicellulose Degradation. BIOREFINERY OF OIL PRODUCING PLANTS FOR VALUE‐ADDED PRODUCTS 2022:199-220. [DOI: 10.1002/9783527830756.ch11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Isolation and Screening of Microorganisms for the Effective Pretreatment of Lignocellulosic Agricultural Wastes. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5514745. [PMID: 34604384 PMCID: PMC8481070 DOI: 10.1155/2021/5514745] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 08/21/2021] [Accepted: 09/02/2021] [Indexed: 11/17/2022]
Abstract
Lignocellulosic waste is the most abundant biorenewable biomass on earth, and its hydrolysis releases highly valued reducing sugars. However, the presence of lignin in the biopolymeric structure makes it highly resistant to solubilization thereby hindering the hydrolysis of cellulose and hemicellulose. Microorganisms are known for their potential complex enzymes that play a dominant role in lignocellulose conversion. Therefore, the current study was designed to isolate and screen potential microorganisms for their selective delignification ability for the pretreatment of lignocellulosic biomass. An extensive isolation and screening procedure yielded 36 desired isolates (22 bacteria, 7 basidiomycete fungi, and 7 filamentous fungi). Submerged cultivation of these desired microorganisms revealed 4 bacteria and 10 fungi with potent lignocellulolytic enzyme activities. The potent isolates were identified as Pleurotus, Trichoderma, Talaromyces, Bacillus, and Chryseobacterium spp. confirmed by morphological and molecular identification. The efficiency of these strains was determined through enzyme activities, and the degraded substrates were analyzed through scanning electron microscopy (SEM) and X-ray diffraction (XRD). Among all isolated microbes, Pleurotus spp. were found to have high laccase activity. The cellulose-decomposing and selective delignification strains were subjected to solid-state fermentation (SSF). SSF of field waste corn stalks as a single-carbon source provides Pleurotus spp. better condition for the secretion of ligninolytic enzymes. These isolated ligninolytic enzymes producing microorganisms may be used for the effective pretreatment of lignocellulosic agricultural wastes for the production of high value-added natural products by fermentation.
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Gupta GK, Dixit M, Kapoor RK, Shukla P. Xylanolytic Enzymes in Pulp and Paper Industry: New Technologies and Perspectives. Mol Biotechnol 2021; 64:130-143. [PMID: 34580813 DOI: 10.1007/s12033-021-00396-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 09/08/2021] [Indexed: 11/26/2022]
Abstract
The pulp and paper industry discharges massive amount of wastewater containing hazardous organochlorine compounds released during different processing stages. Therefore, some cost-effective and nonpolluting practices such as enzymatic treatments are required for the potential mitigation of effluents released in the environment. Various xylanolytic enzymes such as xylanases, laccases, cellulases and hemicellulases are used to hydrolyse raw materials in the paper manufacturing industry. These enzymes are used either individually or in combination, which has the efficient potential to be considered for bio-deinking and bio-bleaching components. They are highly dynamic, renewable, and high in specificity for enhancing paper quality. The xylanase act on the xylan and cellulases act on the cellulose fibers, and thus increase the bleaching efficacy of paper. Similarly, hemicellulase enzyme like endo-xylanases, arabinofuranosidase and β-D-xylosidases have been described as functional properties towards the biodegradation of biomass. In contrast, laccase enzymes act as multi-copper oxidoreductases, bleaching the paper by the oxidation and reduction process. Laccases possess low redox potential compared to other enzymes, which need some redox mediators to catalyze. The enzymatic process can be affected by various factors such as pH, temperature, metal ions, incubation periods, etc. These factors can either increase or decrease the efficiency of the enzymes. This review draws attention to the xylanolytic enzyme-based advanced technologies for pulp bleaching in the paper industry.
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Affiliation(s)
- Guddu Kumar Gupta
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Mandeep Dixit
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Rajeev Kumar Kapoor
- Enzyme and Fermentation Technology Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India
| | - Pratyoosh Shukla
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
- School of Biotechnology, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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Nagpal R, Bhardwaj NK, Mahajan R. Synergistic approach using ultrafiltered xylano-pectinolytic enzymes for reducing bleaching chemical dose in manufacturing rice straw paper. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:44637-44646. [PMID: 33063206 DOI: 10.1007/s11356-020-11104-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 10/04/2020] [Indexed: 06/11/2023]
Abstract
In this study, action of ultrafiltered xylano-pectinolytic enzymes from a bacterial strain has been evaluated for bleaching of rice straw soda-anthraquinone pulp. Maximum bio-bleaching effect and release of non-cellulosic impurities were noticed with xylano:pectinolytic enzymes dose of 6.0:2.1-IU/g pulp, treatment time of 180 min at 10% pulp consistency, pH 8.5, and temperature 55 °C. Microscopic images of bio-bleached rice straw pulp also confirmed the efficacy of ultrafiltered enzymes, as bleaching agent. This bio-bleaching treatment resulted in 15.38% and 32% reduction in kappa number and active chlorine dioxide dose, respectively, along with increase in various physical properties, burst index (12.50%), tear index (19.07%), breaking length (14.30%), double fold number (26.31%), Gurley porosity (45.32%) and viscosity (16.17%). This bio-bleaching approach not only improved the pulp quality but also reduced environmental pollution load by decreasing effluent parameters values of BOD and COD by 23.67% and 27.44%, respectively. This study indicates that use of ultrafiltered xylano-pectinolytic synergism for rice straw pulp bleaching will ultimately help in making the process eco-friendly, along with better quality pulp. This is the first report on use of ultrafiltered xylanase and pectinase, produced from a bacterial isolate, for bleaching of rice straw pulp.
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Affiliation(s)
- Raksha Nagpal
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India
| | - Nishi Kant Bhardwaj
- Avantha Centre for Industrial Research and Development, Paper Mill Campus, Yamuna Nagar, India
| | - Ritu Mahajan
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India.
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Phukon LC, Chourasia R, Kumari M, Godan TK, Sahoo D, Parameswaran B, Rai AK. Production and characterisation of lipase for application in detergent industry from a novel Pseudomonas helmanticensis HS6. BIORESOURCE TECHNOLOGY 2020; 309:123352. [PMID: 32299046 DOI: 10.1016/j.biortech.2020.123352] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/13/2020] [Accepted: 03/15/2020] [Indexed: 06/11/2023]
Abstract
The aim of this study was to explore novel source of lipase from biodiversity hot spot region of Sikkim with activity at broad temperature range for application in detergent industry. Among the isolates, Pseudomonas helmanticensis HS6 showed activity at wide range of temperatures was selected for lipase production. Statistical optimisation for enhanced production of lipase resulted in enhancement of lipase activity from 2.3 to 179.3 U/mg. Lipase was purified resulting in 18.78 fold purification, 5.58% yield and high specific activity of 3368 U/mg. The partially purified lipase was found to be active in wide range of temperature (5-80 °C) and pH (6-9), showing optimum activity at 50 °C at pH 7. Peptide sequences on mass spectrometric analysis of purified lipase showed similarity to lipase family protein of three species of Pseudomonas. Both crude and purified lipase retained residual activity of 40-80% after 3 h of incubation with commercial detergents suggesting its application in detergent industry.
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Affiliation(s)
- Loreni Chiring Phukon
- Institute of Bioresources and Sustainable Development, Sikkim Centre, Tadong 737102, Sikkim, India
| | - Rounak Chourasia
- Institute of Bioresources and Sustainable Development, Sikkim Centre, Tadong 737102, Sikkim, India
| | - Megha Kumari
- Institute of Bioresources and Sustainable Development, Sikkim Centre, Tadong 737102, Sikkim, India
| | - Tharangattumana Krishnan Godan
- CSIR - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695019, Kerala, India
| | - Dinabandhu Sahoo
- Institute of Bioresources and Sustainable Development, Sikkim Centre, Tadong 737102, Sikkim, India
| | - Binod Parameswaran
- CSIR - National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695019, Kerala, India
| | - Amit Kumar Rai
- Institute of Bioresources and Sustainable Development, Sikkim Centre, Tadong 737102, Sikkim, India.
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Gautério GV, da Silva LGG, Hübner T, da Rosa Ribeiro T, Kalil SJ. Maximization of xylanase production by Aureobasidium pullulans using a by-product of rice grain milling as xylan source. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101511] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Bhardwaj N, Kumar B, Verma P. A detailed overview of xylanases: an emerging biomolecule for current and future prospective. BIORESOUR BIOPROCESS 2019. [DOI: 10.1186/s40643-019-0276-2] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Abstract
Xylan is the second most abundant naturally occurring renewable polysaccharide available on earth. It is a complex heteropolysaccharide consisting of different monosaccharides such as l-arabinose, d-galactose, d-mannoses and organic acids such as acetic acid, ferulic acid, glucuronic acid interwoven together with help of glycosidic and ester bonds. The breakdown of xylan is restricted due to its heterogeneous nature and it can be overcome by xylanases which are capable of cleaving the heterogeneous β-1,4-glycoside linkage. Xylanases are abundantly present in nature (e.g., molluscs, insects and microorganisms) and several microorganisms such as bacteria, fungi, yeast, and algae are used extensively for its production. Microbial xylanases show varying substrate specificities and biochemical properties which makes it suitable for various applications in industrial and biotechnological sectors. The suitability of xylanases for its application in food and feed, paper and pulp, textile, pharmaceuticals, and lignocellulosic biorefinery has led to an increase in demand of xylanases globally. The present review gives an insight of using microbial xylanases as an “Emerging Green Tool” along with its current status and future prospective.
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Kaur A, Varghese LM, Mahajan R. Simultaneous production of industrially important alkaline xylanase-pectinase enzymes by a bacterium at low cost under solid-state fermentation conditions. Biotechnol Appl Biochem 2019; 66:574-585. [PMID: 31021011 DOI: 10.1002/bab.1757] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 04/16/2019] [Indexed: 11/09/2022]
Abstract
Simultaneous production of alkaline xylanase and all seven types of pectinases by a bacterial isolate, under solid-state fermentation was checked in this study. Under optimized conditions, high concurrent production of xylanase (22,800 ± 578 IU/g substrate) and pectinase (4,832 ± 189 IU/g substrate) was achieved. The different types of pectinases produced were exo-polymethylgalacturonase (782 IU/g), endo-polymethylgalacturonase (6.42 U/g), exo-polygalacturonase (2,250 IU/g), endo-polygalacturonase (11.57 U/g), polymethylgalacturonate lyase (53.99 IU/g), polygalacturonate lyase (59.78 IU/g), and pectin esterase (5.78 IU/g). Wheat bran resulted in the highest titer of both enzymes. The maximum xylanase-pectinase yield was detected after 7 days of incubation with 2 mM MgSO4 and 1.5 g/L K2 HPO4 at wheat bran to moisture ratio 1:1.5 (w/v), media to flask volume ratio 1:25, pH 7.0, temperature 37 °C, and inoculum size 15%. Xylanase was most stable at pH 8.0, retained more than 75% activity up to 24 H, whereas pectinase was most stable at pH 9.0, having full activity even after 24 H. At 45 °C, the xylanase showed 82% residual activity after 6 H of incubation. The pectinase was 97% and 61% stable up to 3 H at 50 and 55 °C, respectively. This is the first report showing the production of xylanase-pectinases by bacterium along with high titer of seven types of pectinases, suitable for industries.
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Affiliation(s)
- Amanjot Kaur
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India
| | | | - Ritu Mahajan
- Department of Biotechnology, Kurukshetra University, Kurukshetra, India
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Singh G, Kaur S, Khatri M, Arya SK. Biobleaching for pulp and paper industry in India: Emerging enzyme technology. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.01.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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