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Noda I. Two-dimensional correlation analysis of spectra collected without knowing sampling order. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.11.085] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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52
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Yang R, Dong G, Sun X, Yang Y, Yu Y, Liu H, Zhang W. Feasibility of the simultaneous determination of polycyclic aromatic hydrocarbons based on two-dimensional fluorescence correlation spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 190:342-346. [PMID: 28946078 DOI: 10.1016/j.saa.2017.09.061] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Revised: 09/16/2017] [Accepted: 09/20/2017] [Indexed: 06/07/2023]
Abstract
A new approach for quantitative determination of polycyclic aromatic hydrocarbons (PAHs) in environment was proposed based on two-dimensional (2D) fluorescence correlation spectroscopy in conjunction with multivariate method. 40 mixture solutions of anthracene and pyrene were prepared in the laboratory. Excitation-emission matrix (EEM) fluorescence spectra of all samples were collected. And 2D fluorescence correlation spectra were calculated under the excitation perturbation. The N-way partial least squares (N-PLS) models were developed based on 2D fluorescence correlation spectra, showing a root mean square error of calibration (RMSEC) of 3.50μgL-1 and root mean square error of prediction (RMSEP) of 4.42μgL-1 for anthracene and of 3.61μgL-1 and 4.29μgL-1 for pyrene, respectively. Also, the N-PLS models were developed for quantitative analysis of anthracene and pyrene using EEM fluorescence spectra. The RMSEC and RMSEP were 3.97μgL-1 and 4.63μgL-1 for anthracene, 4.46μgL-1 and 4.52μgL-1 for pyrene, respectively. It was found that the N-PLS model using 2D fluorescence correlation spectra could provide better results comparing with EEM fluorescence spectra because of its low RMSEC and RMSEP. The methodology proposed has the potential to be an alternative method for detection of PAHs in environment.
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Affiliation(s)
- Renjie Yang
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China
| | - Guimei Dong
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China
| | - Xueshan Sun
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China
| | - Yanrong Yang
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China
| | - Yaping Yu
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China
| | - Haixue Liu
- Laboratory of Agricultural Analysis, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China.
| | - Weiyu Zhang
- College of Engineering and Technology, Tianjin Agricultural University, 22 Jinjing Road, Tianjin 300384, China.
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53
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Noda I. Vibrational two-dimensional correlation spectroscopy (2DCOS) study of proteins. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 187:119-129. [PMID: 28675821 DOI: 10.1016/j.saa.2017.06.034] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Revised: 06/22/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
A tutorial is provided for the generalized two-dimensional correlation spectroscopy (2DCOS), which is applicable to the vibrational spectroscopic study of proteins and related systems. In 2DCOS, similarity or dissimilarity among variations of spectroscopic intensities, which are induced by applying an external perturbation to the sample, is examined by constructing correlation spectra defined by two independent spectral variable axes. By spreading congested or overlapped peaks along the second dimension, apparent spectral resolution is enhanced and interpretation of complex spectra becomes simplified. A set of simple rules for the intensities and signs of correlation peaks is used to extract insightful information. Simulated IR spectra for a model protein are used to demonstrate the specific utility of 2DCOS. Additional tools useful in the 2DCOS analysis of proteins, such as data segmentation assisted with moving-window analysis, 2D codistribution analysis, Pareto scaling, and null-space projection are also discussed.
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Affiliation(s)
- Isao Noda
- University of Delaware, Newark, DE 19716, USA.
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Evaluation of the nitrogen content during the new-shoot-growing stage in apple leaves using two-dimensional correlation spectroscopy. PLoS One 2017; 12:e0186751. [PMID: 29073247 PMCID: PMC5658073 DOI: 10.1371/journal.pone.0186751] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/06/2017] [Indexed: 11/19/2022] Open
Abstract
The new-shoot-growing stage is an important period of apple tree nutrition distribution. The objective of this study is to provide technical support for apple tree nutrition diagnosis by constructing quantitative evaluation models between the apple leaf nitrogen content during the new-shoot-growing stage and characteristic spectral parameters. The correlation coefficients between the original spectral data and the nitrogen content were calculated. Then, the sensitive bands of the nitrogen content were selected using the theory of two-dimensional (2D) correlation spectroscopy. Finally, partial least squares regression (PLSR) and support vector machine (SVM) evaluation models were established using 2 parameters: Rx (maximum spectral reflectivity in the waveband) and Sx (total spectral reflectivity in the waveband). The results showed that the sensitive bands in the 2D correlation synchronous and asynchronous spectrograms were 537-560 nm and 708-719 nm. The PLSR model can be used to estimate the nitrogen content. Compared with PLSR, SVM provided better modeling and testing results, with a larger coefficient of determination (R2) and a smaller root-mean-square error (RMSE). The SVM model based on Sx was a good backup method. The calibration R2 of the model was 0.821, its RMSE was 0.710 g·kg-1, the validation R2 was 0.768, and its RMSE was 1.019 g·kg-1. The SVM model based on 2D correlation spectroscopy can be used to quantitatively estimate the nitrogen content in apple leaves.
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55
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The effect of pH on the bonding of Cu 2+ and chitosan-montmorillonite composite. Int J Biol Macromol 2017; 103:751-757. [DOI: 10.1016/j.ijbiomac.2017.05.065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 05/02/2017] [Accepted: 05/15/2017] [Indexed: 11/23/2022]
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56
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Dynamic-SERS spectroscopy for the in situ discrimination of xanthine analogues in ternary mixture. Anal Bioanal Chem 2017; 409:5569-5579. [DOI: 10.1007/s00216-017-0495-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/12/2017] [Accepted: 06/26/2017] [Indexed: 10/19/2022]
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57
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Discrimination of sesame oil adulterated with corn oil using information fusion of synchronous and asynchronous two-dimensional near-mid infrared spectroscopy. EUR J LIPID SCI TECH 2017. [DOI: 10.1002/ejlt.201600459] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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58
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Evaluation of usefulness of 2DCorr technique in assessing physicochemical properties of bacterial cellulose. Carbohydr Polym 2017; 161:208-218. [DOI: 10.1016/j.carbpol.2016.12.063] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2016] [Revised: 12/21/2016] [Accepted: 12/24/2016] [Indexed: 11/21/2022]
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59
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Mumtaz MW, Hamid AA, Akhtar MT, Anwar F, Rashid U, AL-Zuaidy MH. An overview of recent developments in metabolomics and proteomics – phytotherapic research perspectives. FRONTIERS IN LIFE SCIENCE 2017. [DOI: 10.1080/21553769.2017.1279573] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Muhammad Waseem Mumtaz
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Malaysia
- Department of Chemistry, Faculty of Science, University of Gujrat, Gujrat, Pakistan
| | - Azizah Abdul Hamid
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Malaysia
| | - Muhammad Tayyab Akhtar
- Institute of Bioscience, Laboratory of Natural Products, Universiti Putra Malaysia, Serdang, Malaysia
| | - Farooq Anwar
- Department of Chemistry, University of Sargodha, Sargodha, Pakistan
| | - Umer Rashid
- Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, Malaysia
| | - Mizher Hezam AL-Zuaidy
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, Serdang, Malaysia
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60
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Zhang Y, Tang H, Wu P. Multiple interaction regulated phase transition behavior of thermo-responsive copolymers containing cationic poly(ionic liquid)s. Phys Chem Chem Phys 2017; 19:30804-30813. [DOI: 10.1039/c7cp05846b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Schematic illustration of the phase transition mechanism of the P(OEGMA-co-BVIm[SCN]) copolymer.
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Affiliation(s)
- Yingna Zhang
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science and Laboratory for Advanced Materials
- Fudan University
- Shanghai 200433
- China
| | - Hui Tang
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science and Laboratory for Advanced Materials
- Fudan University
- Shanghai 200433
- China
| | - Peiyi Wu
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science and Laboratory for Advanced Materials
- Fudan University
- Shanghai 200433
- China
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62
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63
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Mecozzi M, Pietroletti M. Chemical composition and surfactant characteristics of marine foams investigated by means of UV-vis, FTIR and FTNIR spectroscopy. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:22418-22432. [PMID: 27544530 DOI: 10.1007/s11356-016-7423-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Accepted: 08/04/2016] [Indexed: 06/06/2023]
Abstract
In this study, we collected the ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR) and Fourier transform near-infrared (FTNIR) spectra of marine foams from different sites and foams produced by marine living organisms (i.e. algae and molluscs) to retrieve information about their molecular and structural composition. UV-vis spectra gave information concerning the lipid and pigment contents of foams. FTIR spectroscopy gave a more detailed qualitative information regarding carbohydrates, lipids and proteins in addition with information about the mineral contents of foams. FTNIR spectra confirmed the presence of carbohydrates, lipids and proteins in foams. Then, due to the higher content of structural information of FTIR spectroscopy with respect to FTNIR and UV-vis, we join the FTIR spectra of marine foams to those of humic substance from marine sediments and to the spectra of foams obtained by living organisms. We submitted this resulting FTIR spectral dataset to statistical multivariate methods to investigate specific aspects of foams such as structural similarity among foams and in addition, contributions from the organic matter of living organisms. Cluster analysis (CA) evidenced several cases (i.e. clusters) of marine foams having high structural similarity with foams from vegetal and animal samples and with humic substance extracted from sediments. These results suggested that all the living organisms of the marine environment can give contributions to the chemical composition of foams. Moreover, as CA also evidenced cases of structural differences within foam samples, we applied two-dimensional correlation analysis (2DCORR) to the FTIR spectra of marine foams to investigate the molecular characteristics which caused these structural differences. Asynchronous spectra of two-dimensional correlation analysis showed that the structural heterogeneity among foam samples depended reasonably on the presence and on the qualitative difference of electrostatic (hydrogen bonds) and nonpolar (van der Waals and π-π) interactions involving carbohydrate proteins and lipids present. The presence and relevance of these interactions agree with the supramolecular and surfactant characteristics of marine organic matter described in the scientific literature.
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Affiliation(s)
- Mauro Mecozzi
- Laboratory of Chemometrics and Environmental Applications, ISPRA, Via di Castel Romano 100, 00128, Rome, Italy.
| | - Marco Pietroletti
- Laboratory of Chemometrics and Environmental Applications, ISPRA, Via di Castel Romano 100, 00128, Rome, Italy
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65
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66
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Herran Cuspinera RM, Hore DK. Cell growth characteristics from angle- and polarization-resolved light scattering: Prospects for two-dimensional correlation analysis. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.04.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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67
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Investigation on the intermolecular interaction between diethyl ether and dichloromethane in gaseous phase by using the DAOSD approach. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.12.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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68
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69
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Noda I. Modified two-dimensional correlation spectra for streamlined determination of sequential order of intensity variations. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.01.092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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70
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Noda I. Techniques useful in two-dimensional correlation and codistribution spectroscopy (2DCOS and 2DCDS) analyses. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.01.089] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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71
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Liu Y, Zhou T, Zhang A. Generation Mechanism of Oxidation Products during the Air Atmosphere Oxidation of SEBS/PP Blends: Tracked by 2D Correlation Infrared Spectroscopy. MACROMOL CHEM PHYS 2016. [DOI: 10.1002/macp.201600213] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yongcheng Liu
- State Key Laboratory of Polymer Materials Engineering of China; Polymer Research Institute; Sichuan University; Chengdu 610065 China
| | - Tao Zhou
- State Key Laboratory of Polymer Materials Engineering of China; Polymer Research Institute; Sichuan University; Chengdu 610065 China
| | - Aiming Zhang
- State Key Laboratory of Polymer Materials Engineering of China; Polymer Research Institute; Sichuan University; Chengdu 610065 China
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72
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Acquistucci R, Melini V, Cecconi S, Mecozzi M. Evaluation of Rheological Properties of Four Italian Rice Samples and Starch Thereof by RVA and FTIR Spectroscopy Supported by Double Two-Dimensional Correlation Analysis: Evidence of Lipid–Carbohydrate Interactions. Cereal Chem 2016. [DOI: 10.1094/cchem-08-15-0160-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Rita Acquistucci
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per gli Alimenti e la Nutrizione, Via Ardeatina 546, 00178 Rome, Italy
| | - Valentina Melini
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per gli Alimenti e la Nutrizione, Via Ardeatina 546, 00178 Rome, Italy
| | - Sabrina Cecconi
- Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per gli Alimenti e la Nutrizione, Via Ardeatina 546, 00178 Rome, Italy
| | - Mauro Mecozzi
- Istituto Superiore per la Protezione e la Ricerca Ambientale–Laboratorio di Chemiometria ed Applicazioni Ambientali, Via di Castel Romano 100, 00128 Rome, Italy
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73
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Yang YR, Ren YF, Dong GM, Yang RJ, Liu HX, Du YH, Zhang WY. Determination of Methanol in Alcoholic Beverages by Two-Dimensional Near-Infrared Correlation Spectroscopy. ANAL LETT 2016. [DOI: 10.1080/00032719.2016.1144060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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74
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Miao L, Liu Y, Li H, Qi Y, Lu F. Two-dimensional correlation infrared spectroscopy applied to the identification of ephedrine and pseudoephedrine in illegally adulterated slimming herbal products. Drug Test Anal 2016; 9:221-229. [DOI: 10.1002/dta.1963] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 01/20/2016] [Accepted: 01/21/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Li Miao
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai 200433 China
| | - Yan Liu
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai 200433 China
| | - Hao Li
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai 200433 China
| | - Yunpeng Qi
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai 200433 China
| | - Feng Lu
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai 200433 China
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75
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Hou L, Wu P. On the abnormal “forced hydration” behavior of P(MEA-co-OEGA) aqueous solutions during phase transition from infrared spectroscopic insights. Phys Chem Chem Phys 2016; 18:15593-601. [DOI: 10.1039/c6cp01244b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
During the phase separation of POEGA in water, C–H groups exhibit dehydration, whereas CO and C–O–C groups present “forced hydration”.
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Affiliation(s)
- Lei Hou
- The State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- and Laboratory of Advanced Materials
- Fudan University
| | - Peiyi Wu
- The State Key Laboratory of Molecular Engineering of Polymers
- Collaborative Innovation Center of Polymers and Polymer Composite Materials
- Department of Macromolecular Science
- and Laboratory of Advanced Materials
- Fudan University
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76
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Li Y, Hu J, Fu M, Tang J, Dong L, Liu S. Investigation of intermolecular interactions of mixed extractants of quaternary phosphonium or ammonium chlorides and bis(2,4,4-ethylhexyl)phosphoric acid for metal separation. RSC Adv 2016. [DOI: 10.1039/c6ra07813c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The adjustable intermolecular interactions of mixed extractants to improve metal separation.
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Affiliation(s)
- Ya Li
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Jiugang Hu
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Mingbo Fu
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Jia Tang
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Linlin Dong
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
| | - Shijun Liu
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha
- China
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77
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Shi J, Liu Y, Guo R, Li X, He A, Gao Y, Wei Y, Liu C, Zhao Y, Xu Y, Noda I, Wu J. Design of a New Concentration Series for the Orthogonal Sample Design Approach and Estimation of the Number of Reactions in Chemical Systems. APPLIED SPECTROSCOPY 2015; 69:1229-1242. [PMID: 26647046 DOI: 10.1366/14-07759] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A new concentration series is proposed for the construction of a two-dimensional (2D) synchronous spectrum for orthogonal sample design analysis to probe intermolecular interaction between solutes dissolved in the same solutions. The obtained 2D synchronous spectrum possesses the following two properties: (1) cross peaks in the 2D synchronous spectra can be used to reflect intermolecular interaction reliably, since interference portions that have nothing to do with intermolecular interaction are completely removed, and (2) the two-dimensional synchronous spectrum produced can effectively avoid accidental collinearity. Hence, the correct number of nonzero eigenvalues can be obtained so that the number of chemical reactions can be estimated. In a real chemical system, noise present in one-dimensional spectra may also produce nonzero eigenvalues. To get the correct number of chemical reactions, we classified nonzero eigenvalues into significant nonzero eigenvalues and insignificant nonzero eigenvalues. Significant nonzero eigenvalues can be identified by inspecting the pattern of the corresponding eigenvector with help of the Durbin-Watson statistic. As a result, the correct number of chemical reactions can be obtained from significant nonzero eigenvalues. This approach provides a solid basis to obtain insight into subtle spectral variations caused by intermolecular interaction.
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Affiliation(s)
- Jiajia Shi
- College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China
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78
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Najbauer EE, Bazsó G, Apóstolo R, Fausto R, Biczysko M, Barone V, Tarczay G. Identification of Serine Conformers by Matrix-Isolation IR Spectroscopy Aided by Near-Infrared Laser-Induced Conformational Change, 2D Correlation Analysis, and Quantum Mechanical Anharmonic Computations. J Phys Chem B 2015. [PMID: 26201050 DOI: 10.1021/acs.jpcb.5b05768] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The conformers of α-serine were investigated by matrix-isolation IR spectroscopy combined with NIR laser irradiation. This method, aided by 2D correlation analysis, enabled unambiguously grouping the spectral lines to individual conformers. On the basis of comparison of at least nine experimentally observed vibrational transitions of each conformer with empirically scaled (SQM) and anharmonic (GVPT2) computed IR spectra, six conformers were identified. In addition, the presence of at least one more conformer in Ar matrix was proved, and a short-lived conformer with a half-life of (3.7 ± 0.5) × 10(3) s in N2 matrix was generated by NIR irradiation. The analysis of the NIR laser-induced conversions revealed that the excitation of the stretching overtone of both the side chain and the carboxylic OH groups can effectively promote conformational changes, but remarkably different paths were observed for the two kinds of excitations.
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Affiliation(s)
- Eszter E Najbauer
- †Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
| | - Gábor Bazsó
- †Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
| | - Rui Apóstolo
- ‡Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Rui Fausto
- ‡Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Malgorzata Biczysko
- §Physics Department and International Centre for Quantum and Molecular Structure, Shanghai University, Shanghai, 200444 China
| | - Vincenzo Barone
- ∥Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa, Italy
| | - György Tarczay
- †Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, PO Box 32, H-1518, Budapest 112, Hungary
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Detection of structurally similar adulterants in botanical dietary supplements by thin-layer chromatography and surface enhanced Raman spectroscopy combined with two-dimensional correlation spectroscopy. Anal Chim Acta 2015; 883:22-31. [DOI: 10.1016/j.aca.2015.04.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 04/07/2015] [Accepted: 04/08/2015] [Indexed: 11/22/2022]
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80
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Hou L, Wu P. Comparison of LCST-transitions of homopolymer mixture, diblock and statistical copolymers of NIPAM and VCL in water. SOFT MATTER 2015; 11:2771-81. [PMID: 25698362 DOI: 10.1039/c5sm00026b] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The LCST-transitions of linear, well-defined polymers of N-isopropylacrylamide (NIPAM) and N-vinylcaprolactam (VCL), including a homopolymer mixture, diblock and statistical copolymers, in water are explored and compared by applying turbidity and FTIR measurements in combination with two-dimensional correlation spectroscopy (2Dcos). Only one transition is observed in all polymer systems, suggesting a dependent aggregation of poly(N-isopropylacrylamide) (PNIPAM) and poly(N-vinylcaprolactam) (PVCL) parts in the phase transition processes. With the help of 2Dcos analysis, it is discovered that the hydrophobic interaction among C-H groups is the driving force for simultaneous collapse of the two distinct thermo-responsive segments. Additionally, the delicate differences within the LCST-transitions thereof have been emphasized, where the phase separation temperatures of the homopolymer mixture and the diblock copolymer are close while that of the statistical copolymer is relatively higher. Moreover, both diblock and statistical copolymers exhibit rather sharp phase transitions while the homopolymer mixture demonstrates a moderately continuous one.
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Affiliation(s)
- Lei Hou
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science and Laboratory for Advanced Materials, Fudan University, Shanghai 200433, China.
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81
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Park Y, Noda I, Jung YM. Two-dimensional correlation spectroscopy in polymer study. Front Chem 2015; 3:14. [PMID: 25815286 PMCID: PMC4356163 DOI: 10.3389/fchem.2015.00014] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Accepted: 02/17/2015] [Indexed: 11/23/2022] Open
Abstract
This review outlines the recent works of two-dimensional correlation spectroscopy (2DCOS) in polymer study. 2DCOS is a powerful technique applicable to the in-depth analysis of various spectral data of polymers obtained under some type of perturbation. The powerful utility of 2DCOS combined with various analytical techniques in polymer studies and noteworthy developments of 2DCOS used in this field are also highlighted.
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Affiliation(s)
- Yeonju Park
- Department of Chemistry, Kangwon National University Chunchon, South Korea
| | - Isao Noda
- Department of Materials Science and Engineering, University of Delaware Newark, DE, USA
| | - Young Mee Jung
- Department of Chemistry, Kangwon National University Chunchon, South Korea
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Li X, He A, Huang K, Liu H, Zhao Y, Wei Y, Xu Y, Noda I, Wu J. Two-dimensional asynchronous spectrum with auxiliary cross peaks in probing intermolecular interactions. RSC Adv 2015. [DOI: 10.1039/c5ra16062f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A new approach called “asynchronous spectrum with auxiliary peaks (ASAP)” is proposed for generating a 2D asynchronous spectrum to investigate the intermolecular interaction between two solutes (P and Q) dissolved in the same solution.
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Affiliation(s)
- Xiaopei Li
- Institute of Process Engineering
- Chinese Academy of Sciences
- P. R. China
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Rare Earth Materials Chemistry and Applications
| | - Anqi He
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Kun Huang
- Institute of Process Engineering
- Chinese Academy of Sciences
- P. R. China
| | - Huizhou Liu
- Institute of Process Engineering
- Chinese Academy of Sciences
- P. R. China
| | - Ying Zhao
- Institute of Chemistry
- Chinese Academy of Sciences
- P. R. China
| | - Yongju Wei
- College of Chemistry and Material Science
- Hebei Normal University
- Shijiazhuang
- P. R. China
| | - Yizhuang Xu
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Isao Noda
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Jinguang Wu
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory for Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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Mahrous EA, Farag MA. Two dimensional NMR spectroscopic approaches for exploring plant metabolome: A review. J Adv Res 2014; 6:3-15. [PMID: 25685540 PMCID: PMC4293671 DOI: 10.1016/j.jare.2014.10.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 10/09/2014] [Accepted: 10/11/2014] [Indexed: 01/06/2023] Open
Abstract
Today, most investigations of the plant metabolome tend to be based on either nuclear magnetic resonance (NMR) spectroscopy or mass spectrometry (MS), with or without hyphenation with chromatography. Although less sensitive than MS, NMR provides a powerful complementary technique for the identification and quantification of metabolites in plant extracts. NMR spectroscopy, well appreciated by phytochemists as a particularly information-rich method, showed recent paradigm shift for the improving of metabolome(s) structural and functional characterization and for advancing the understanding of many biological processes. Furthermore, two dimensional NMR (2D NMR) experiments and the use of chemometric data analysis of NMR spectra have proven highly effective at identifying novel and known metabolites that correlate with changes in genotype or phenotype. In this review, we provide an overview of the development of NMR in the field of metabolomics with special focus on 2D NMR spectroscopic techniques and their applications in phytomedicines quality control analysis and drug discovery from natural sources, raising more attention at its potential to reduce the gap between the pace of natural products research and modern drug discovery demand.
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Affiliation(s)
- Engy A Mahrous
- Pharmacognosy Department, College of Pharmacy, Cairo University, Cairo, Kasr el Aini st. P.B. 11562, Egypt
| | - Mohamed A Farag
- Pharmacognosy Department, College of Pharmacy, Cairo University, Cairo, Kasr el Aini st. P.B. 11562, Egypt
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Frontiers of two-dimensional correlation spectroscopy. Part 2. Perturbation methods, fields of applications, and types of analytical probes. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.01.016] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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