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Tu JQ, Liu HP, Wen YH, Chen P, Liu ZT. A novel polysaccharide from Hericium erinaceus: Preparation, structural characteristics, thermal stabilities, and antioxidant activities in vitro. J Food Biochem 2021; 45:e13871. [PMID: 34402085 DOI: 10.1111/jfbc.13871] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 06/18/2021] [Accepted: 06/21/2021] [Indexed: 12/20/2022]
Abstract
A novel polysaccharide fraction (HEP) from Hericium erinaceus was successively isolated and purified in the present study. We researched its structure and thermal stabilities, and further studied its antioxidant activities in vitro. The results showed that HEP was an acid heteropolysaccharide, with an average molecular weight of approximately 19.7 kDa by high-performance gel permeation chromatography. Ion chromatography indicated that HEP was mainly composed of fucose:galactose:glucose:mannose:gluconic acid (Fuc:Gal:Glu:Man:GlcA) in a molar ratio of 1:2.87:0.09:0.12:0.01. Additionally, Fourier-transformed infrared and NMR spectroscopy further demonstrated that HEP was a pyranose containing α-configuration, mainly consisting of α-1-4-Fuc and α-1-6-Gal as the main chain, with →3,6)-α-D-Man-(1→and→1,6)-Glc was branched, with α-D-GlcpA-(1 as T-terminal. The specific rotation of HEP was +55°; by the differential scanning calorimetry and the thermal stability measurement of thermogravimetric analysis for HEP showed that the pyrolysis process of HEP was mainly divided into two processes, and its melting point was 75.93℃. In vitro anti-oxidation experiments showed that HEP had a certain ability to scavenge DPPH, hydroxyl, superoxide anion, and ABTS radicals. It was found that HEP had a strong ability to scavenge DPPH-free radicals, and the highest scavenging rate could reach 91.72% ± 0.17%, which was basically equivalent to the scavenging ability of Vitamin C (Vc). Therefore, it was revealed that HEP might be used as a natural antioxidant component. PRACTICAL APPLICATIONS: A novel polysaccharide (HEP) had a potent activity possibly due to its monosaccharide composition, sugar residues, and physicochemical properties. This research proved the potential of HEP in anti-oxidation and provided the possibility of developing new natural anti-oxidation products.
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Affiliation(s)
- Jian-Qiu Tu
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, PR China
| | - Hui-Ping Liu
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, PR China
| | - Ya-Hui Wen
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, PR China
| | - Pei Chen
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, PR China
| | - Zi-Tian Liu
- State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Food Nutrition and Safety, Ministry of Education of China, College of Food Science and Engineering, Tianjin University of Science and Technology, Tianjin, PR China
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D'Cunha R, Crawford TD. Modeling Complex Solvent Effects on the Optical Rotation of Chiral Molecules: A Combined Molecular Dynamics and Density Functional Theory Study. J Phys Chem A 2021; 125:3095-3108. [PMID: 33829790 DOI: 10.1021/acs.jpca.1c00803] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The challenge of assigning the absolute stereochemical configuration to a chiral compound can be overcome via accurate ab initio predictions of optical rotation, a sensitive molecular property that is further complicated by solvent effects. The solvent's "chiral imprint"-the transfer of the chirality from the solute to the surrounding achiral solvent-is explored here using conformational averaging and time-dependent density-functional theory. These complex solvent effects are taken into account via simple averaging over a molecular dynamics trajectory together with the explicit quantum mechanical consideration of the solvent molecules within the solute's cybotactic region and implicit modeling of the bulk solvent. We consider several axes along which the system's optical rotation varies, including the sampling of the dynamical trajectory, the quality of the one-electron basis set, and the use of continuum solvent models to account for bulk effects.
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Affiliation(s)
- Ruhee D'Cunha
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - T Daniel Crawford
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.,Molecular Sciences Software Institute, 1880 Pratt Drive, Suite 1100, Blacksburg, Virginia 24060, United States
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Aharon T, Caricato M. Compact Basis Sets for Optical Rotation Calculations. J Chem Theory Comput 2020; 16:4408-4415. [DOI: 10.1021/acs.jctc.0c00446] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tal Aharon
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Marco Caricato
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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4
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A molecular orbital selection approach for fast calculations of specific rotation with density functional theory. Chirality 2019; 32:243-253. [DOI: 10.1002/chir.23158] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/08/2019] [Accepted: 11/13/2019] [Indexed: 11/07/2022]
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Li JQ, Xiao CJ, Li YM, Tian XY, Dong X, Jiang B. Astrernestin, a novel aurone-phenylpropanoid adduct from the roots of Astragalus ernestii. Nat Prod Res 2019; 34:2894-2899. [DOI: 10.1080/14786419.2019.1596101] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Jin-Qiang Li
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
| | - Chao-Jiang Xiao
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
| | - Ye-Meng Li
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
| | - Xin-Yan Tian
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
| | - Xiang Dong
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
| | - Bei Jiang
- Institute of Materia Medica, Dali University, Dali, People’s Republic of China
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Baranowska-Łączkowska A, Łączkowski KZ, Fernández B. The Role of Substituents in Optical Rotation of Oxiranes, Oxetanes, and Oxathietanes. J Chem Inf Model 2019; 59:2103-2109. [DOI: 10.1021/acs.jcim.8b00970] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Krzysztof Z. Łączkowski
- Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum Nicolaus Copernicus University, 2 Jurasz St., PL-85089 Bydgoszcz, Poland
| | - Berta Fernández
- Department of Physical Chemistry, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
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Baranowska-Łączkowska A, Łączkowski KZ, Henriksen C, Fernández B. New Basis Set for the Evaluation of Specific Rotation in Flexible Biological Molecules in Solution. J Phys Chem A 2018; 122:5477-5483. [PMID: 29792432 DOI: 10.1021/acs.jpca.8b03320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A detailed theoretical investigation of specific rotation is carried out in solution for nine flexible molecules of biological importance. Systematic search for the main conformers is followed by time-dependent density functional theory (TD-DFT) calculations of specific rotation employing a wide range of basis sets. Due to conformational flexibility of the compounds under study, the possibility of basis set size reduction without deterioration of the results is investigated. The increasing size (d-)aug-cc-pVXZ (X = D, T, Q) bases of Dunning et al., and the ORP basis set, recently developed to efficiently provide molecular specific rotation, are used for this purpose. The polarizable continuum model is employed at all steps of the investigation. Comparison of the present results with the available data obtained in a vacuum reveals considerable differences, the values in solution being much closer to the experimental specific rotation data available. The ORP basis set proves to be competitive with the d-aug-cc-pVDZ set of Dunning in specific rotation calculations carried out in solution. While having the same number of functions, the former yields, in general, results considerably closer to the reference triple-ζ values. We can thus recommend the ORP basis set to study the optical rotation in conformationally flexible molecules in solution.
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Affiliation(s)
| | - Krzysztof Z Łączkowski
- Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy , Collegium Medicum Nicolaus Copernicus University , 2 Jurasz St. , PL-85089 Bydgoszcz , Poland
| | - Christian Henriksen
- Department of Applied Mathematics and Computer Science , Technical University of Denmark , 2800 Kgs. Lynbgy , Denmark
| | - Berta Fernández
- Department of Physical Chemistry , University of Santiago de Compostela , E-15782 Santiago de Compostela , Spain
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Howard JC, Sowndarya S. V. S, Ansari IM, Mach TJ, Baranowska-Łączkowska A, Crawford TD. Performance of Property-Optimized Basis Sets for Optical Rotation with Coupled Cluster Theory. J Phys Chem A 2018; 122:5962-5969. [DOI: 10.1021/acs.jpca.8b04183] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Coleman Howard
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | | | - Imaad M. Ansari
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Taylor J. Mach
- Concordia University, St. Paul, Minnesota 55104, United States
| | | | - T. Daniel Crawford
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
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