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Near infrared spectroscopy

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https://www.readbyqxmd.com/read/28535459/spectra-structure-correlations-of-saturated-and-unsaturated-medium-chain-fatty-acids-near-infrared-and-anharmonic-dft-study-of-hexanoic-acid-and-sorbic-acid
#1
Justyna Grabska, Krzysztof B Beć, Mika Ishigaki, Marek J Wójcik, Yukihiro Ozaki
Quantum chemical reproduction of entire NIR spectra is a new trend, enabled by contemporary advances in the anharmonic approaches. At the same time, recent increase of the importance of NIR spectroscopy of biological samples raises high demand for gaining deeper understanding of NIR spectra of biomolecules, i.e. fatty acids. In this work we investigate saturated and unsaturated medium-chain fatty acids, hexanoic acid and sorbic acid, in the near-infrared region. By employing fully anharmonic density functional theory (DFT) calculations we reproduce the experimental NIR spectra of these systems, including the highly specific spectral features corresponding to the dimerization of fatty acids...
May 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28534917/charge-stabilizing-tris-triphenylamine-zinc-porphyrin-carbon-nanotube-hybrids-synthesis-characterization-and-excited-state-charge-transfer-studies
#2
Luis M Arellano, Myriam Barrejón, Habtom B Gobeze, María J Gómez-Escalonilla, José Luis G Fierro, Francis D'Souza, Fernando Langa
Functionalization of single-walled (SWCNTs) and double-walled carbon nanotubes (DWCNTs) with a charge stabilizing zinc porphyrin functionalized with triphenylamine entities has been accomplished. The synthetic approach involved the reaction of tris-(triphenylamine)porphyrinato zinc(ii) with iodobenzene functionalized nanotubes through a Sonogashira C-C cross coupling reaction under microwave irradiation conditions. Evidence of covalent functionalization and the extent of functionalization was obtained from systematic studies carried out by AFM, TGA, XPS and Raman spectroscopy techniques...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534842/rapid-prediction-of-moisture-content-in-intact-green-coffee-beans-using-near-infrared-spectroscopy
#3
Adnan Adnan, Dieter von Hörsten, Elke Pawelzik, And Daniel Mörlein
Moisture content (MC) is one of the most important quality parameters of green coffee beans. Therefore, its fast and reliable measurement is necessary. This study evaluated the feasibility of near infrared (NIR) spectroscopy and chemometrics for rapid and non-destructive prediction of MC in intact green coffee beans of both Coffeaarabica (Arabica) and Coffeacanephora (Robusta) species. Diffuse reflectance (log 1/R) spectra of intact beans were acquired using a bench top Fourier transform NIR instrument. MC was determined gravimetrically according to The International Organization for Standardization (ISO) 6673...
May 19, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28534831/rapidly-simultaneous-determination-of-six-effective-components-in-cistanche-tubulosa-by-near-infrared-spectroscopy
#4
Xinhong Wang, Xiaoguang Wang, Yuhai Guo
Quantitative determination of multiple effective components in a given plant usually requires a very large amount of authentic natural products. In this study, we proposed a rapid and non-destructive method for the simultaneous determination of echinacoside, verbascoside, mannitol, sucrose, glucose and fructose in Cistanche tubulosa by near infrared spectroscopy (NIRS). Near infrared diffuse reflectance spectroscopy (DRS) and high performance liquid chromatography (HPLC) were conducted on 116 batches of C. tubulosa samples...
May 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28534672/a-review-of-the-principles-and-applications-of-near-infrared-spectroscopy-to-characterize-meat-fat-and-meat-products
#5
Nuria Prieto, Olga Pawluczyk, Michael Edward Russell Dugan, Jennifer Lynn Aalhus
Consumer demand for quality and healthfulness has led to a higher need for quality assurance in meat production. This requirement has increased interest in near-infrared (NIR) spectroscopy due to the ability for rapid, environmentally friendly, and non-invasive prediction of meat quality or authentication of added-value meat products. This review includes the principles of NIR spectroscopy, pre-processing methods, and multivariate analyses used for quantitative and qualitative purposes in the meat sector. Recent advances in portable NIR spectrometers that enable new online applications in the meat industry are shown and their performance evaluated...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28533613/the-effects-of-tool-holding-on-body-schema-during-motor-imagery-a-near-infrared-spectroscopy-study
#6
Tsubasa Oikawa, Daisuke Hirano, Takamichi Taniguchi, Hitoshi Maruyama
[Purpose] The purpose of this study is to assess the influence of tool holding on brain activities during motor imagery in two tasks: imagining the movement of writing the alphabet while holding a pen and without holding the pen. [Subjects and Methods] Eleven healthy right-handed adults performed two tasks, holding a pen and not holding the pen during imagining the movement of writing the alphabet using a pen. Regions of targets were Brodmann areas 6 which were a motor-related region, 44/45 and 39/40 which taken on the role of forming the body schema...
April 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28533478/real-time-near-infrared-raman-spectroscopy-for-the-diagnosis-of-nasopharyngeal-cancer
#7
Lim Chwee Ming, Nagaraja Rao Gangodu, Thomas Loh, Wei Zheng, Jianfeng Wang, Kan Lin, Huang Zhiwei
Near-infrared (NIR) Raman spectroscopy has been investigated as a tool to differentiate nasopharyngeal cancer (NPC) from normal nasopharyngeal tissue in an ex-vivo setting. Recently, we have miniaturized the fiber-optic Raman probe to investigate its utility in real time in-vivo surveillance of NPC patients. A posterior probability model using partial linear square (PLS) mathematical technique was constructed to verify the sensitivity and specificity of Raman spectroscopy in diagnosing NPC from post-irradiated and normal tissue using a diagnostic algorithm from three significant latent variables...
May 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28532891/the-acute-effects-of-integrated-myofascial-techniques-on-lumbar-paraspinal-blood-flow-compared-with-kinesio-taping-a-pilot-study
#8
Yusuf Shah, Marco Arkesteijn, Dexter Thomas, Jemma Whyman, Louis Passfield
BACKGROUND: Myofascial techniques and Kinesio Taping are therapeutic interventions used to treat low back pain. However, limited research has been conducted into the underlying physiological effects of these types of treatments. OBJECTIVES: The purpose of this study was to compare the acute effects of integrated myofascial techniques (IMT) and Kinesio Tape (KT) on blood flow at the lumbar paraspinal musculature. METHODS: Forty-four healthy participants (18 male and 26 female) (age, 26 ± SD 7) volunteered for this study and were randomly assigned to one of three interventions, IMT, KT or a control group (Sham TENS)...
April 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28532336/changing-techniques-in-crop-plant-classification-molecularization-at-the-national-institute-of-agricultural-botany-during-the-1980s
#9
Matthew Holmes
Modern methods of analysing biological materials, including protein and DNA sequencing, are increasingly the objects of historical study. Yet twentieth-century taxonomic techniques have been overlooked in one of their most important contexts: agricultural botany. This paper addresses this omission by harnessing unexamined archival material from the National Institute of Agricultural Botany (NIAB), a British plant science organization. During the 1980s the NIAB carried out three overlapping research programmes in crop identification and analysis: electrophoresis, near infrared spectroscopy (NIRS) and machine vision systems...
April 2017: Annals of Science
https://www.readbyqxmd.com/read/28532050/full-in-vitro-analyses-of-new-generation-bulk-fill-dental-composites-cured-by-halogen-light
#10
Tuçe Hazal Tekin, Aysel Kantürk Figen, Pınar Yılmaz Atalı, Bilge Coşkuner Filiz, Mehmet Burçin Pişkin
The objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1, 7, 15 and 30days of storage in water...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531282/near-infrared-spectroscopy-derived-lipid-core-burden-index-predicts-adverse-cardiovascular-outcome-in-patients-with-coronary-artery-disease-during-long-term-follow-up
#11
Anne-Sophie Schuurman, Maxime Vroegindewey, Isabella Kardys, Rohit M Oemrawsingh, Jin M Cheng, Sanneke de Boer, Hector M Garcia-Garcia, Robert-Jan van Geuns, Evelyn S Regar, Joost Daemen, Nicolas M van Mieghem, Patrick W Serruys, Eric Boersma, K Martijn Akkerhuis
Aims: Near-infrared spectroscopy (NIRS) is able to quantify cholesterol within coronary arteries by the lipid core burden index (LCBI). We studied the prognostic value of NIRS-derived LCBI in patients with coronary artery disease (CAD) for adverse cardiac outcome during long-term follow-up. Methods and results: During 2009-2013, NIRS was performed in a non-culprit artery of 275 patients undergoing coronary angiography for acute coronary syndrome (ACS) or stable angina...
May 20, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28531129/rapid-and-cost-effective-quantification-of-glucosinolates-and-total-phenolic-content-in-rocket-leaves-by-visible-near-infrared-spectroscopy
#12
Eva María Toledo-Martín, Rafael Font, Sara Obregón-Cano, Antonio De Haro-Bailón, Myriam Villatoro-Pulido, Mercedes Del Río-Celestino
The potential of visible-near infrared spectroscopy to predict glucosinolates and total phenolic content in rocket (Eruca vesicaria) leaves has been evaluated. Accessions of the E. vesicaria species were scanned by NIRS as ground leaf, and their reference values regressed against different spectral transformations by modified partial least squares (MPLS) regression. The coefficients of determination in the external validation (R²VAL) for the different quality components analyzed in rocket ranged from 0.59 to 0...
May 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28530726/surface-enhanced-hyper-raman-scattering-sehrs-and-its-applications
#13
REVIEW
Fani Madzharova, Zsuzsanna Heiner, Janina Kneipp
Surface enhanced hyper Raman scattering (SEHRS) is the spontaneous, two-photon excited Raman scattering that occurs for molecules residing in high local optical fields of plasmonic nanostructures. Being regarded as a non-linear analogue of surface enhanced Raman scattering (SERS), SEHRS shares most of its properties, but also has additional characteristics. They include complementary spectroscopic information resulting from different selection rules and a stronger enhancement due to the non-linearity in excitation...
May 22, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28527989/the-effect-of-ph-on-the-bonding-of-cu-2-and-chitosan-montmorillonite-composite
#14
Chao Hu, Guoyuan Li, Yiyu Wang, Fengyi Li, Guangguang Guo, Hongqing Hu
Based on the contradict statements on the mechanisms of the bonding between metal ions and chitosan based adsorbent, this paper present studies on the Cu(2+) adsorption by the chitosan-montmorillonite composite. The in situ attenuated total reflectance Fourier transform infrared spectroscopy and two dimensional correlation analysis were used to record the spectra during the adsorption and the pH perturbation, and analyze the interaction sequence of the groups related to the adsorption, respectively. The results showed that the bonding with -NH3(+) might attribute the adsorption capacity greater than that with hydroxyl...
May 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28527744/abundance-and-composition-of-near-surface-microplastics-and-plastic-debris-in-the-stockholm-archipelago-baltic-sea
#15
Berit Gewert, Martin Ogonowski, Andreas Barth, Matthew MacLeod
We collected plastic debris in the Stockholm Archipelago using a manta trawl, and additionally along a transect in the Baltic Sea from the island of Gotland to Stockholm in a citizen science study. The samples were concentrated by filtration and organic material was digested using hydrogen peroxide. Suspected plastic material was isolated by visual sorting and 59 of these were selected to be characterized with Fourier transform infrared spectroscopy. Polypropylene and polyethylene were the most abundant plastics identified among the samples (53% and 24% respectively)...
May 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28526867/aberrant-functional-connectivity-in-depression-as-an-index-of-state-and-trait-rumination
#16
David Rosenbaum, Alina Haipt, Kristina Fuhr, Florian B Haeussinger, Florian G Metzger, Hans-Christoph Nuerk, Andreas J Fallgatter, Anil Batra, Ann-Christine Ehlis
Depression has been shown to be related to a variety of aberrant brain functions and structures. Particularly the investigation of alterations in functional connectivity (FC) in major depressive disorder (MDD) has been a promising endeavor, since a better understanding of pathological brain networks may foster our understanding of the disease. However, the underling mechanisms of aberrant FC in MDD are largely unclear. Using functional near-infrared spectroscopy (fNIRS) we investigated FC in the cortical parts of the default mode network (DMN) during resting-state in patients with current MDD...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526841/organic-carbon-prediction-in-soil-cores-using-vnir-and-mir-techniques-in-an-alpine-landscape
#17
Xiaolin Jia, Songchao Chen, Yuanyuan Yang, Lianqing Zhou, Wu Yu, Zhou Shi
Diffuse reflectance spectroscopy (DRS), including visible and near-infrared (VNIR) and mid-infrared (MIR) radiation, is a rapid, accurate and cost-effective technique for estimating soil organic carbon (SOC). We examined 24 soil cores (0-100 cm) from the Sygera Mountains on the Qinghai-Tibet Plateau, considering field-moist intact VNIR, air-dried ground VNIR and air-dried ground MIR spectra at 5-cm intervals. Preprocessed spectra were used to predict the SOC in the soil cores using partial least squares regression (PLSR) and a support vector machine (SVM)...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28525272/direct-synthesis-of-an-unprecedented-stable-radical-of-nickel-ii-3-5-bis-dimedonyl-azadiisoindomethene-with-strong-and-narrow-near-infrared-absorption-at-%C3%AE-%C3%A2-1000-nm
#18
Elena A Makarova, Yuriy V Zatsikha, Kelly M E Newman, Vinod K Paidi, Valeria A Beletsky, Johan van Lierop, Evgeny A Lukyanets, Victor N Nemykin
An unprecedented stable neutral radical nickel(II) complex of 3,5-bis(dimedonyl)azadiisoindomethene (1) was prepared by the direct reaction between 1,3-diiminoisoindoline and dimedone. A new radical complex 1 has an intense and narrow absorption at 1008 nm and can be reduced to a less stable anionic [1](-) with a typical aza(dibenzo)boron dipyrromethene (aza-BODIPY) UV-vis spectrum. Complex 1, along with two other colored condensation reaction products 2 and 3, was characterized by spectroscopy and X-ray crystallography, while the paramagnetic nature of 1 was probed by EPR and SQUID methods...
May 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28523863/feasibility-of-near-infrared-transmittance-spectroscopy-to-predict-fatty-acid-composition-of-commercial-processed-meat
#19
Massimo De Marchi, Carmen L Manuelian, Sofia Ton, Martino Cassandro, Mauro Penasa
BACKGROUND: The new European Regulation 1169/2011 about nutrition declaration of food products compels to add saturated fatty acids, being voluntary to declare monounsaturated and polyunsaturated fatty acids. Therefore, industry is interested in more rapid, easy and less cost-effective analysis methods to accomplish the labelling regulation. This study aimed to evaluate the ability of near infrared transmittance spectroscopy (wavelengths between 850 and 1050 nm) to predict fatty acid (FA) composition of commercial processed meat samples (n = 310)...
May 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28523228/resting-state-and-personality-component-bis-bas-predict-the-brain-activity-eeg-and-fnirs-measure-in-response-to-emotional-cues
#20
Michela Balconi, Maria E Vanutelli, Elisabetta Grippa
INTRODUCTION: The present study explored the role of resting state and personality component (BIS/BAS measure) on prefrontal cortical responsiveness to emotional cues. Indeed, we supposed that lateralized resting activity (right vs. left) and approach (BAS) versus avoidance (BIS) attitude may explain the successive emotional processing within the prefrontal cortex (PFC) based on the stimulus valence (positive and negative emotional cues). METHODS: Hemodynamic (functional near-infrared spectroscopy, fNIRS) and electroencephalographic (EEG) measures were considered...
May 2017: Brain and Behavior
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