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Yin Y, Fei X, Tian J, Xu L, Li Y, Wang Y. Synthesis of lipase-hydrogel microspheres and their application in deacidification of high-acid rice bran oil. NEW J CHEM 2022. [DOI: 10.1039/d2nj03761k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The main challenge of rice bran oil (RBO) as a highly nutritional edible oil is the high content of free fatty acids.
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Affiliation(s)
- Yawen Yin
- Instrumental Analysis Center, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
- School of Biological Engineering, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
| | - Xu Fei
- Instrumental Analysis Center, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
| | - Jing Tian
- School of Biological Engineering, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
| | - Longquan Xu
- Instrumental Analysis Center, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
| | - Yao Li
- School of Light Industry and Chemical Engineering, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
| | - Yi Wang
- School of Biological Engineering, Dalian Polytechnic University, 1 Qinggongyuan Road, Dalian, 116034, China
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2
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Li D, Zhong X, Faiza M, Wang W, Lian W, Liu N, Wang Y. Simultaneous preparation of edible quality medium and high purity diacylglycerol by a novel combined approach. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.111949] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Qin X, Zhong J, Wang Y. A mutant T1 lipase homology modeling, and its molecular docking and molecular dynamics simulation with fatty acids. J Biotechnol 2021; 337:24-34. [PMID: 34197821 DOI: 10.1016/j.jbiotec.2021.06.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Accepted: 06/25/2021] [Indexed: 11/18/2022]
Abstract
A thermostable T1 lipase from Geobacillus zalihae exhibits broad substrate specificity and good potential application in fats and oils. However, structural insight into the enzyme against substrates is poorly understood at the molecular level. Herein, the study aimed to examine interactions between a mutant T1 lipase (Mut-T1 lipase) and selected fatty acids (caprylic, myristic, stearic, oleic, linoleic and linolenic acids) by performing molecular docking and molecular dynamics (MD) simulation. The structure of Mut-T1 lipase obtained by homology modeling was reliable for molecular docking and MD simulation. Molecular docking revealed that Mut-T1 lipase showed low binding affinity for caprylic acid (-4.97 kcal/mol) compared to the other fatty acids (-5.65 to -6.88 kcal/mol). However, the conformation of Mut-T1 lipase-caprylic acid complex was comparably stable during the simulation, in terms of less root-mean square fluctuation. Besides, solvent accessible surface area value of Mut-T1 lipase-fatty acid complexes decreased with increasing chain length of fatty acid. van der Waals interactions were requisite in maintaining complex stability during the binding process. This work provides structural insight into interactions between the lipase and the fatty acids, which will facilitate design and applications of new mutants of T1 lipase in modifying fats and oils.
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Affiliation(s)
- Xiaoli Qin
- College of Food Science, Southwest University, Chongqing, 400715, PR China
| | - Jinfeng Zhong
- College of Food Science, Southwest University, Chongqing, 400715, PR China
| | - Yonghua Wang
- College of Food Science and Technology, South China University of Technology, Guangzhou, 510006, PR China.
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An Effective Strategy for the Production of Lauric Acid-Enriched Monoacylglycerol via Enzymatic Glycerolysis from Black Soldier Fly (Hermetia illucens) Larvae (BSFL) Oil. Appl Biochem Biotechnol 2021; 193:2781-2792. [PMID: 33871767 DOI: 10.1007/s12010-021-03565-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Accepted: 04/08/2021] [Indexed: 10/21/2022]
Abstract
Here, we developed an efficient strategy for the production of lauric acid-enriched monoacylglycerol (MAG) via enzymatic glycerolysis using black soldier fly (Hermetia illucens) larvae (BSFL) oil. The effects of the substrate molar ratio, reaction temperature, type of immobilized lipase, and organic solvent on the MAG content and conversion degree of BSFL oil were optimized. The maximum substrate conversion rate (97.88%) and MAG content (70.84%) were obtained in a tert-butanol system at 50 °C with a glycerol/BSFL oil molar ratio of 4:1 by using immobilized MAS1 lipase as a catalyst. The MAG content in the purified product reached 97.7%, with lauric acid accounting for 50.2%. Improved oxidation stability was observed after glycerolysis. Overall, this study provides a new strategy for the preparation of lauric acid-enriched MAG from BSFL oil.
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Maiangwa J, Hamdan SH, Mohamad Ali MS, Salleh AB, Zaliha Raja Abd Rahman RN, Shariff FM, Leow TC. Enhancing the stability of Geobacillus zalihae T1 lipase in organic solvents and insights into the structural stability of its variants. J Mol Graph Model 2021; 105:107897. [PMID: 33770705 DOI: 10.1016/j.jmgm.2021.107897] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 11/28/2022]
Abstract
Critical to the applications of proteins in non-aqueous enzymatic processes is their structural dynamics in relation to solvent polarity. A pool of mutants derived from Geobacillus zalihae T1 lipase was screened in organic solvents (methanol, ethanol, propanol, butanol and pentanol) resulting in the selection of six mutants at initial screening (A83D/K251E, R21C, G35D/S195 N, K84R/R103C/M121I/T272 M and R106H/G327S). Site-directed mutagenesis further yielded quadruple mutants A83D/M121I/K251E/G327S and A83D/M121I/S195 N/T272 M, both of which had improved activity after incubation in methanol. The km and kcat values of these mutants vary marginally with the wild-type enzyme in the methanol/substrate mixture. Thermally induced unfolding of mutants was accompanied with some loss of secondary structure content. The root mean square deviations (RMSD) and B-factors revealed that changes in the structural organization are intertwined with an interplay of the protein backbone with organic solvents. Spatially exposed charged residues showed correlations between the solvation dynamics of the methanol solvent and the hydrophobicity of the residues. The short distances of the radial distribution function provided the required distances for hydrogen bond formation and hydrophobic interactions. These dynamic changes demonstrate newly formed structural interactions could be targeted and incorporated experimentally on the basis of solvent mobility and mutant residues.
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Affiliation(s)
- Jonathan Maiangwa
- Department of Cell and Molecular Biology, Enzyme Microbial Technology Research Center, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia; Department of Microbiology Kaduna State University, Nigeria; Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia
| | - Siti Hajar Hamdan
- Department of Biochemistry, Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia
| | - Mohd Shukuri Mohamad Ali
- Department of Biochemistry, Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia
| | - Abu Bakar Salleh
- Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia
| | - Raja Noor Zaliha Raja Abd Rahman
- Department of Microbiology, Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia
| | - Fairolniza Mohd Shariff
- Institute of Bioscience, 43400, UPM Serdang, Universiti Putra Malaysia Serdang, Selangor, Malaysia
| | - Thean Chor Leow
- Department of Cell and Molecular Biology, Enzyme Microbial Technology Research Center, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia; Enzyme Microbial Technology Research Centre, Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia Serdang, 43400, UPM Serdang, Selangor, Malaysia; Institute of Bioscience, 43400, UPM Serdang, Universiti Putra Malaysia Serdang, Selangor, Malaysia.
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6
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Wang X, Zhao X, Qin X, Zhao Z, Yang B, Wang Y. Immobilized MAS1 Lipase-catalyzed Synthesis of n-3 PUFA-rich Triacylglycerols in Deep Eutectic Solvents. J Oleo Sci 2021; 70:227-236. [PMID: 33456003 DOI: 10.5650/jos.ess20200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
n-3 polyunsaturated fatty acids (PUFA)-rich triacylglycerols (TAG) with many beneficial effects are still difficult to be synthesized efficiently and rapidly by current synthetic techniques. This study reports the fatty acid specificity of immobilized MAS1 lipase and its efficient synthesis of n-3 PUFA-rich TAG by esterification of glycerol with n-3 PUFA in natural deep eutectic solvents (NADES) systems. Immobilized MAS1 lipase showed the highest preference for capric acid [C10:0, the highest specificity constant (1/α)=1] whereas it discriminated strongly against docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) due to their lowest specificity constants (1/α=0.19 and 0.2). Moreover, the highest n-3 PUFA-rich TAG content (55.8%) with similar n-3 PUFA composition to the substrate was obtained in choline chloride/glycerol (CG) system. There was a 1.38-fold increase of TAG content in CG system compared with that in the solvent-free system. Interestingly, immobilized MAS1 lipase exhibited no regiospecificity in the solvent-free and various NADES systems. Besides, the potential reaction mechanism of immobilized MAS1 lipase-catalyzed esterification of glycerol with n-3 PUFA in NADES systems was described. It was found that the use of NADES as solvents could greatly enhance TAG content, and make it easy to separate the product. These results indicated that immobilized MAS1 lipase is a promising biocatalyst for the efficient synthesis of n-3 PUFA-rich TAG by esterification of glycerol with n-3 PUFA in NADES systems.
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Affiliation(s)
- Xiumei Wang
- College of Environmental and Biological Engineering, Putian University.,Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants.,School of Bioscience and Bioengineering, South China University of Technology
| | - Xiaoxu Zhao
- College of Environmental and Biological Engineering, Putian University.,Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants
| | - Xiaoli Qin
- College of Food Science, Southwest University
| | - Zexin Zhao
- School of Bioscience and Bioengineering, South China University of Technology
| | - Bo Yang
- School of Bioscience and Bioengineering, South China University of Technology
| | - Yonghua Wang
- Guangdong Research Center of Lipid Science and Applied Engineering Technology, School of Food Science and Engineering, South China University of Technology
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7
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Li D, Wang W, Liu P, Xu L, Faiza M, Yang B, Wang L, Lan D, Wang Y. Immobilization ofCandida antarcticaLipase B Onto ECR1030 Resin and its Application in the Synthesis of n-3 PUFA-Rich Triacylglycerols. EUR J LIPID SCI TECH 2017. [DOI: 10.1002/ejlt.201700266] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Daoming Li
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Weifei Wang
- School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 China
| | - Pengzhan Liu
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Long Xu
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Muniba Faiza
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Bo Yang
- School of Bioscience and Bioengineering; South China University of Technology; Guangzhou 510006 China
| | - Leyuan Wang
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Dongming Lan
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
| | - Yonghua Wang
- School of Food Science and Engineering; South China University of Technology; Guangzhou 510640 China
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8
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Qin X, Chen H, Liu Y, Liu X. Simplified Physical Upgrading of High-Acid Adlay Bran Ethanol Extracts by Supercritical CO2. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2017. [DOI: 10.1515/ijfe-2017-0104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractDeacidification is one of the key steps in oil-refining processes. This study reported a simple approach for upgrading high-acid adlay bran oil by supercritical carbon dioxide (SC-CO2) extraction. The high-acid adlay bran oil was obtained by three-stage countercurrent ethanol extraction of adlay bran, with high free fatty acids (34 % FFAs). The FFA content in adlay bran oil reduced to 10.6 % by SC-CO2extraction under optimized conditions. Interestingly, the SC-CO2deacidification process also markedly reduced oil color value from 11.5 (Red) to 0.3 (Red) and acetone-insoluble matters in the oil from 1.56 % to 0.17 %. The results indicated solvent extraction combined with SC-CO2deacidification method could be a feasible approach to significantly upgrade high-acid adlay bran oil and simplify refining process of adlay bran oil.
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10
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Preparation of Highly Pure n-3 PUFA-Enriched Triacylglycerols by Two-Step Enzymatic Reactions Combined with Molecular Distillation. J AM OIL CHEM SOC 2016. [DOI: 10.1007/s11746-016-2928-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Photo-mediated optimized synthesis of silver nanoparticles for the selective detection of Iron(III), antibacterial and antioxidant activity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:1004-1019. [PMID: 27987654 DOI: 10.1016/j.msec.2016.11.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 09/12/2016] [Accepted: 11/06/2016] [Indexed: 11/21/2022]
Abstract
The AgNPs synthesized by green method have shown great potential in several applications such as biosensing, biomedical, catalysis, electronic etc. The present study deals with the selective colorimetric detection of Fe3+ using photoinduced green synthesized AgNPs. For the synthesis purpose, an aqueous extract of Croton bonplandianum (AEC) was used as a reducing and stabilizing agent. The biosynthesis was confirmed by UV-visible spectroscopy where an SPR band at λmax 436nm after 40s and 428nm after 30min corresponded to the existence of AgNPs. The optimum conditions for biosynthesis of AgNPs were 30min sunlight exposure time, 5.0% (v/v) AEC inoculum dose and 4mM AgNO3 concentration. The stability of synthesized AgNPs was monitored up to 9months. The size and shape of AgNPs with average size 19.4nm were determined by Field Emission Scanning Electron Microscope (FE-SEM) and High-Resolution Transmission Electron Microscope (HR-TEM). The crystallinity was determined by High-Resolution X-ray Diffractometer (HR-XRD) and Selected Area Electron Diffraction (SAED) pattern. The chemical and elemental compositions were determined by Fourier Transformed Infrared Spectroscopy (FTIR) and Energy Dispersive X-ray Spectroscopy (EDX) respectively. The Atomic Force Microscopy (AFM) images represented the lateral and 3D topological characteristics of AgNPs. The XPS analysis confirmed the presence of two individual peaks which attributed to the Ag 3d3/2 and Ag 3d5/2 binding energies corresponding to the presence of metallic silver. The biosynthesized AgNPs showed potent antibacterial activity against both gram-positive and gram-negative bacterial strains as well as antioxidant activity. On the basis of results and facts, a probable mechanism was also proposed to explore the possible route of AgNPs synthesis, colorimetric detection of Fe3+, antibacterial and antioxidant activity.
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13
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Tang Q, Lan D, Yang B, Khan FI, Wang Y. Site-directed mutagenesis studies of hydrophobic residues in the lid region of T1 lipase. EUR J LIPID SCI TECH 2016. [DOI: 10.1002/ejlt.201600107] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Qingyun Tang
- School of Food Science and Engineering; State Key Laboratory of Pulp and Paper Engineering; South China University of Technology; Guangzhou P. R. China
| | - Dongming Lan
- School of Food Science and Engineering; State Key Laboratory of Pulp and Paper Engineering; South China University of Technology; Guangzhou P. R. China
| | - Bo Yang
- School of Bioscience and Bioengineering; South China University of Technology; Guangzhou P. R. China
| | - Faez Iqbal Khan
- School of Chemistry and Chemical Engineering; Henan University of Technology; Zhengzhou P.R. China
| | - Yonghua Wang
- School of Food Science and Engineering; State Key Laboratory of Pulp and Paper Engineering; South China University of Technology; Guangzhou P. R. China
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Li D, Wang W, Durrani R, Li X, Yang B, Wang Y. Simplified Enzymatic Upgrading of High-Acid Rice Bran Oil Using Ethanol as a Novel Acyl Acceptor. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:6730-7. [PMID: 27571030 DOI: 10.1021/acs.jafc.6b02518] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
One of the major challenges in the upgrading of high-acid rice bran oil (RBO) is to efficiently reduce the amount of free fatty acids. Here we report a novel method for upgrading high-acid RBO using ethanol as a novel acyl acceptor in combination with a highly selective lipase from Malassezia globosa (SMG1-F278N). This process enabled an unprecedented deacidification efficiency of up to 99.80% in a short time (6 h); the immobilized SMG1-F278N used in deacidification exhibited excellent operational stability and could be used for at least 10 consecutive batches without detectable loss in activity. Scale-up was performed under optimized conditions to verify the applicability of this process, and low-acid (0.08%) RBO with a high level of γ-oryzanol (27.8 g/kg) and γ-oryzanol accumulation fold (1.5) was obtained after molecular distillation at lower temperature (120 °C). Overall, we report a simplified and efficient procedure for the production of edible RBO from high-acid RBO.
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Affiliation(s)
- Daoming Li
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
| | - Weifei Wang
- School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, China
| | - Rabia Durrani
- School of Bioscience and Bioengineering, South China University of Technology , Guangzhou 510006, China
| | - Xingxing Li
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
| | - Bo Yang
- School of Bioscience and Bioengineering, South China University of Technology , Guangzhou 510006, China
| | - Yonghua Wang
- School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, China
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Kumar V, Gundampati RK, Singh DK, Bano D, Jagannadham MV, Hasan SH. Photoinduced green synthesis of silver nanoparticles with highly effective antibacterial and hydrogen peroxide sensing properties. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 162:374-385. [PMID: 27424098 DOI: 10.1016/j.jphotobiol.2016.06.037] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/18/2016] [Accepted: 06/22/2016] [Indexed: 11/20/2022]
Abstract
In this study, an eco-friendly and sustainable green route was employed for the synthesis of stable silver nanoparticles (AgNPs) using aqueous leaf extract of Euphorbia hirta (AEE) as both reducing as well as a stabilizing agent. The synthesis of AgNPs was confirmed by UV-visible spectroscopy which produced a prominent SPR band at λmax 425nm after 25min of sunlight exposure. The AgNPs thus synthesized were optimized using one factor at a time approach, and these optimized conditions were 25min of sunlight exposure time, 5.0% (v/v) of AEE inoculum dose and 3.0mM of AgNO3 concentration. The Field Emission Scanning Electron Microscopy (FE-SEM) and High Resolution Transmission Electron Microscopy (HRTEM) analysis confirmed the presence of spherical AgNPs with average size 15.5nm. The crystallinity was determined by X-ray Diffractometer (XRD) and Selected Area Electron Diffraction (SAED) pattern. Chemical and elemental compositions were determined by Fourier Transformed Infrared Spectroscopy (FTIR) and Energy Dispersive X-ray Spectroscopy (EDX) respectively. The Atomic Force Microscopy (AFM) images with average roughness 1.15nm represented the lateral and 3D topological characteristic of AgNPs. The AgNPs thus synthesized showed effective antibacterial activity against gram negative and gram positive bacteria as well as hydrogen peroxide sensing property with a minimum detection limit of 10(-7)M.
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Affiliation(s)
- Vijay Kumar
- Nanomaterials Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, U.P., India.
| | - Ravi Kumar Gundampati
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India; Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, USA
| | - Devendra K Singh
- Nanomaterials Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, U.P., India
| | - Daraksha Bano
- Nanomaterials Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, U.P., India
| | - Medicherla V Jagannadham
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi 221005, India
| | - Syed Hadi Hasan
- Nanomaterials Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, U.P., India.
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Kumar V, Gundampati RK, Singh DK, Jagannadham MV, Sundar S, Hasan SH. Photo-induced rapid biosynthesis of silver nanoparticle using aqueous extract of Xanthium strumarium and its antibacterial and antileishmanial activity. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2016.03.032] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Ramesh K, Gundampati RK, Singh S, Mitra K, Shukla A, Jagannadham MV, Chattopadhyay D, Misra N, Ray B. Self-assembly, doxorubicin-loading and antibacterial activity of well-defined ABA-type amphiphilic poly(N-vinylpyrrolidone)-b-poly(d,l-lactide)-b-poly(N-vinyl pyrrolidone) triblock copolymers. RSC Adv 2016. [DOI: 10.1039/c5ra23239b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis, self-assembly, DOX-loading and antibacterial activity of well-defined ABA-type amphiphilic poly(N-vinylpyrrolidone)-b-poly(d,l-lactide)-b-poly(N-vinylpyrrolidone) triblock copolymers.
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Affiliation(s)
- K. Ramesh
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi – 221005
- India
| | - Ravi Kumar Gundampati
- Molecular Biology Unit
- Institute of Medical Science
- Banaras Hindu University
- Varanasi – 221005
- India
| | - Shikha Singh
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi – 221005
- India
| | - Kheyanath Mitra
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi – 221005
- India
| | - Ankita Shukla
- Molecular Biology Unit
- Institute of Medical Science
- Banaras Hindu University
- Varanasi – 221005
- India
| | | | | | - Nira Misra
- School of Biomedical Engineering
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi-221005
- India
| | - Biswajit Ray
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi – 221005
- India
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Li D, Qin X, Wang J, Yang B, Wang W, Huang W, Wang Y. Hydrolysis of soybean oil to produce diacylglycerol by a lipase from Rhizopus oryzae. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcatb.2015.01.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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19
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Lan D, Wang Q, Xu J, Zhou P, Yang B, Wang Y. Residue Asn277 affects the stability and substrate specificity of the SMG1 lipase from Malassezia globosa. Int J Mol Sci 2015; 16:7273-88. [PMID: 25837472 PMCID: PMC4425016 DOI: 10.3390/ijms16047273] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 03/20/2015] [Accepted: 03/20/2015] [Indexed: 11/25/2022] Open
Abstract
Thermostability and substrate specificity are important characteristics of enzymes for industrial application, which can be improved by protein engineering. SMG1 lipase from Malassezia globosa is a mono- and diacylglycerol lipase (MDL) that shows activity toward mono- and diacylglycerols, but no activity toward triacylglycerols. SMG1 lipase is considered a potential biocatalyst applied in oil/fat modification and its crystal structure revealed that an interesting residue-Asn277 may contribute to stabilize loop 273–278 and the 3104 helix which are important to enzyme characterization. In this study, to explore its role in affecting the stability and catalytic activity, mutagenesis of N277 with Asp (D), Val (V), Leu (L) and Phe (F) was conducted. Circular dichroism (CD) spectral analysis and half-life measurement showed that the N277D mutant has better thermostability. The melting temperature and half-life of the N277D mutant were 56.6 °C and 187 min, respectively, while that was 54.6 °C and 121 min for SMG1 wild type (WT). Biochemical characterization of SMG1 mutants were carried out to test whether catalytic properties were affected by mutagenesis. N277D had similar enzymatic properties as SMG1 WT, but N277F showed a different substrate selectivity profile as compared to other SMG1 mutants. Analysis of the SMG1 3D model suggested that N277D formed a salt bridge via its negative charged carboxyl group with a positively charged guanidino group of R227, which might contribute to confer N277D higher temperature stability. These findings not only provide some clues to understand the molecular basis of the lipase structure/function relationship but also lay the framework for engineering suitable MDL lipases for industrial applications.
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Affiliation(s)
- Dongming Lan
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, China.
| | - Qian Wang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, China.
| | - Jinxin Xu
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China.
| | - Pengfei Zhou
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, China.
| | - Bo Yang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, China.
| | - Yonghua Wang
- College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China.
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Oligomer-dependent and -independent chaperone activity of sHsps in different stressed conditions. FEBS Open Bio 2015; 5:155-62. [PMID: 25834780 PMCID: PMC4359974 DOI: 10.1016/j.fob.2015.02.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 02/20/2015] [Accepted: 02/28/2015] [Indexed: 12/12/2022] Open
Abstract
A great number of studies have proven that sHsps protect cells by inhibiting protein aggregation under heat stress, while little is known about their function to protect cells under acid stress. In this work, we show that Hsp20.1 and Hsp14.1 oligomers dissociated to smaller oligomeric species or even dimer/monomer at low pH (pH 4.0 and pH 2.0), whereas no prominent quaternary structural changes were seen at 50 °C. Both oligomers and smaller oligomeric species exhibited abilities to suppress client aggregation at low pH and at 50 °C. These results suggest that sHsps may function in different modes in different stressed conditions.
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