Elemental analysis, chemical composition, cellulose crystallinity, and FT-IR spectra of Toona sinensis wood

2013 ◽  
Vol 145 (1) ◽  
pp. 175-185 ◽  
Author(s):  
Congjin Chen ◽  
Jianju Luo ◽  
Wen Qin ◽  
Zhangfa Tong
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Elemental Analysis ◽  
Cellulose Crystallinity ◽  
Toona Sinensis ◽  
Ft Ir

scholarly journals Influence of growth conditions on hydrophobicity ofLactobacillus acidophilusandBifidobacterium lactiscells and characteristics by FT-IR spectra

2010 ◽  
Vol 24 (3-4) ◽  
pp. 251-255 ◽  
Author(s):  
Laisana Shakirova ◽  
Lilija Auzina ◽  
Peteris Zikmanis ◽  
Marita Gavare ◽  
Mara Grube
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Physiological State ◽  
Cell Surface Hydrophobicity ◽  
Surface Hydrophobicity ◽  
Growth Conditions ◽  
Probiotic Properties ◽  
Elevated Protein ◽  
Ft Ir ◽  
Quantitative Analyses

In this study we have found, that the values of cell surface hydrophobicity (CSH) ofL. acidophilusLA5 andB. lactisBb12 cells change in response to varied growth conditions – phase of growth, concentration or type of carbon source, presence of oxygen. An evaluation of FT-IR spectra using cluster and quantitative analyses revealed substantial changes of the chemical composition depending on the CSH level ofL. acidophilusLA5 andB. lactisBb12 cells. Decrease of the carbohydrate level was observed in proportion to the increased CSH values alongside with the elevated protein content of more hydrophobic cells of both cultures. The results of present study could help to specify the appropriate physiological state and environment forL. acidophilusLA5 andB. lactisBb12 to ensure their probiotic properties.

Fabrication of Chelate-Setting Cement Using Silicon-Substituted Hydroxyapatite and its Property

2011 ◽  
Vol 493-494 ◽  
pp. 370-374 ◽  
Author(s):  
Y. Nakashima ◽  
Michiyo Honda ◽  
Toshiisa Konishi ◽  
Minori Mizumoto ◽  
Mamoru Aizawa
Keyword(s):  
Mechanical Property ◽  
Compressive Strength ◽  
Surface Modification ◽  
Chemical Composition ◽  
Ir Spectra ◽  
High Dose ◽  
Precipitation Reaction ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Surface Modified

We have developed novel hydroxyapatite (HAp) cement, “chelate-setting HAp cement” on the basis of chelate bonding of inositol hexaphosphate (IP6). In order to create the cement with enhanced bioactivity, we used a silicon-substituted hydroxyapatite (Si-HAp) as a starting material instead of pure HAp powder. The Si-HAp powders were prepared via an aqueous precipitation reaction and surface-modified with IP6 (IP6-Si-HAp). The Si-HAp were synthesized with desired Si contents (0, 0.4, 0.8, 1.6, and 2.4 mass%). Regardless of the amount of Si, the XRD patterns and FT-IR spectra of the powders were similar to each other. Additionally, chemical composition of Si-HAp powders were the almost same as the nominal one. The substitution of Si resulted in a decrease in the a-axis and increase in the c-axis of unit cell of HAp. While, the compressive strength of IP6-Si-HAp cements was higher than that of Si-HAp cements. These results suggest that surface-modification of any powders with IP6 is effective for enhancement of mechanical property. Comparison of mechanical property between HAp and Si-HAp cement specimens revealed that the substitution of lower levels of Si into0 HAp lattice did not greatly influence compressive strength. However, the substitution of high dose of Si (over 2.4 mass%) reduced the compressive strength. Therefore, to fabricate the chelate-setting cements with enhanced bioactivity, it is necessary to control the amount of Si.

scholarly journals Chemical Composition and FT-IR Spectra of Sugar Palm (Arenga pinnata) Fibers Obtained from Different Heights

2013 ◽  
Vol 10 (2) ◽  
pp. 83-97 ◽  
Author(s):  
M.R. Ishak ◽  
Z. Leman ◽  
S.M. Sapuan ◽  
M.Z.A. Rahman ◽  
U.M. K. Anwar
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Ft Ir

scholarly journals Synthesis and Physico-Chemical Studies of Heterometallic Nitrilotriacetates of Chromium(III) with Some 3d Metals

2006 ◽  
Vol 1 (1) ◽  
pp. 84-87
Author(s):  
Victor Ciornea ◽  
Aurelian Gulea
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Elemental Analysis ◽  
Nitrilotriacetic Acid ◽  
Heterometallic Complexes ◽  
Chemical Bonds ◽  
3D Metals ◽  
Thermogravimetric Study ◽  
Physico Chemical ◽  
Chemical Studies

Heterometallic complexes of chromium (III) with some 3d metals have been synthesized based on nitrilotriacetic acid (H3nta), like M(bpy)2Cr2(OH)2(nta)2·nH2O, where M = Mn2+, Co2+, Ni2+ and Zn2+; bpy = α,α′- bipyridine; n = 8 or 9. Their chemical composition has been determined from the results of the elemental analysis and thermogravimetric study. The coordination modes of the nta3 ̄ ligand and the type of chemical bonds have been proposed basing on IR spectra.

Changes in chemical composition of decayed Scots pine and beech wood

2014 ◽  
Vol 21 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Eylem Dizman Tomak
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Scots Pine ◽  
Degradation Mechanism ◽  
Beech Wood ◽  
Accelerated Aging ◽  
Brown Rot ◽  
Brown Rot Fungi ◽  
Decay Test ◽  
Ft Ir

AbstractIn this study, changes in chemical composition of aged and unaged Scots pine and beech wood decayed by brown-rot fungi Coniophora puteana and Poria placenta were presented by Fourier transform infrared (FT-IR) spectra. Samples were exposed to six complete cycles of accelerated aging for 12 days and then subjected to brown-rot fungi attack for 8 weeks. Weight loss of samples was found to be 25–46% depending on wood and fungi species and being aged ones. Accelerated aging treatments seemed to have a slight role on chemical composition of Scots pine and beech samples while they increased biodegradation of samples. FT-IR spectra showed degradation of wood carbohydrates revealed by reduction of the peaks responsible for hemicellulose and cellulose at 1730, 1370, 1150, and 897 cm-1 in pine and 1730, 1370, 1027, and 897 cm-1 in beech. Stronger lignin peaks at 1650, 1593, 1506, 1455, 1422, 1261, and 1230 cm-1 in pine and 1650, 1506, 1455, and 1422 cm-1 in beech were obtained after decay test. FT-IR spectra of samples were consistent with the degradation mechanism of brown-rot fungi. In general, changes in the carbohydrate and lignin peaks were greater in samples exposed to accelerated aging treatments for both wood species.

scholarly journals The preparation of Al2O3-Na2SO4 composites derived from local kaolin through an alkaline destruction combined with sulphatization method

2021 ◽  
Vol 882 (1) ◽  
pp. 012026
Author(s):  
E Maryani ◽  
N Sofiyaningsih ◽  
R Septawendar
Keyword(s):  
Chemical Composition ◽  
Ir Spectra ◽  
Solid Electrolyte ◽  
Thermal Behaviour ◽  
Initial Study ◽  
Vibration Modes ◽  
Alumina Surface ◽  
Mineral Phases ◽  
Ft Ir

Abstract Composites of Na2SO4 is promising for solid electrolyte application. In this initial study, composites of Al2O3/Na2SO4 were successfully synthesized from local kaolin through an alkaline destruction method combined with sulphatization. The composites were characterized including thermal behaviour, mineral phases, chemical composition, FT-IR spectra, and microstructures. The composites consist of a-Al2O3 and Na2SO4 phases after calcination at 1300 °C. This phenomenon is confirmed by the XRF and FT-IR result. The composite consists of Al2O3 and Na2SO4 as major components, accounting 41.98% and 47.09% of the total, respectively. Meanwhile, SiO2 is found as the impurity, accounting 2.86% of the total. The vibration modes of Al-O bonds are detected at 995.27 and 524.46 cm1, whereas the SO4 bands appear at 1111.00 and 617.22 cm1. Na2SO4 exhibits a rod-like particle that cover the alumina surface in the morphology.

Synthesis and Characterization of New Kinds Sulfoxide Extractants for Palladium(II)

2011 ◽  
Vol 287-290 ◽  
pp. 1841-1846
Author(s):  
Li Li Chen ◽  
Zu Min Qiu ◽  
Zhen Zhong Huang ◽  
Yan Fen Wu
Keyword(s):  
Oxygen Atom ◽  
Ir Spectra ◽  
Coordination Number ◽  
Elemental Analysis ◽  
Ethyl Ether ◽  
Analytical Data ◽  
Synthesis And Characterization ◽  
Ft Ir ◽  
Extraction Parameters

Three new extractants for palladium(II) extraction: bis(noctyl-Sulfinyl-ethyl) ether(L1), bis(isooctyl-Sulfinyl-ethyl)ether(L2), bis(isooctyl-Sulfinyl-ethoxy)ethane(L3) were synthesized. Micro-analytical data, elemental analysis, 1HNMR and IR-spectra were used to confirm the structures. Based on independent extraction experiments of Pd(II) , the extraction parameters of Pd(II) were studied in detail, and the optimal extraction parameters were obtained and summarized as the following: H+ concentration of aqueous phase 1.0-1.5 mo1·L-1, sulfoxide extractants concentration 0.01-0.1 mo1·L-1. The order of the extractability of the three extractants towards palladium(II) was L2>L3>L1. The coordination number was studied by the slope method. The results indicated that, in low acidity, the coordination number for extracting palladium (II) was 1.0 with all three extractants, while it was 2.0 in high acidity. FT-IR spectra was used to analyze the structure of the complex. Palladium (II) was coordinated with the oxygen atom in S=O group of the three extractants. and palladium (II) may also coordinated with the oxygen atom in C-O-C group of extractant L1, L2.

Light- or Dark-Colored, L-DOPA-Based Melanins

2018 ◽  
Author(s):  
Koen Vercruysse ◽  
Margaret M. Whalen
Keyword(s):  
Human Physiology ◽  
Ir Spectra ◽  
Immune Cells ◽  
Chemical Properties ◽  
Chemical Signature ◽  
Ft Ir

<p>This report is a continuation of previous research on the H<sub>2</sub>O<sub>2</sub>-mediated synthesis of melanin-like pigments. We synthesized and characterized L-DOPA-based pigments using air- or H<sub>2</sub>O<sub>2</sub>-mediated<sub> </sub>oxidation. We compared their physic-chemical properties and evaluated their capacity to affect the interleukin release from immune cells. The use of higher concentrations of H<sub>2</sub>O<sub>2</sub> resulted in melanin-like materials with a distinct chemical signature in their FT-IR spectra and a lighter color. All pigments enhanced the interleukin release from immune cells. The possibility that lighter-colored melanins can be generated is discussed in the context of the importance of melanin-based pigmentation in human physiology.</p>

scholarly journals Spectroscopy as a useful tool for the identification of changes with time in post-mortem vitreous humor for forensic toxicology purposes

2021 ◽  
Author(s):  
Anna Wójtowicz ◽  
Agata Mitura ◽  
Renata Wietecha-Posłuszny ◽  
Rafał Kurczab ◽  
Marcin Zawadzki
Keyword(s):  
Ir Spectra ◽  
Forensic Toxicology ◽  
Principal Component ◽  
Hierarchical Cluster ◽  
Vitreous Humor ◽  
Attenuated Total Reflection ◽  
Glass Slides ◽  
Added Benefit ◽  
Ft Ir ◽  
Non Destructive

AbstractVitreous humor (VH) is an alternative biological matrix with a great advantage of longer availability for analysis due to the lack of many enzymes. The use of VH in forensic toxicology may have an added benefit, however, this application requires rapid, simple, non-destructive, and relatively portable analytical analysis methods. These requirements may be met by Fourier transform infrared spectroscopy technique (FT-IR) equipped with attenuated total reflection accessory (ATR). FT-IR spectra of vitreous humor samples, deposited on glass slides, were collected and subsequent chemometric data analysis by means of Hierarchical Cluster Analysis and Principal Component Analysis was conducted. Differences between animal and human VH samples and human VH samples stored for diverse periods of time were detected. A kinetic study of changes in the VH composition up to 2 weeks showed the distinction of FT-IR spectra collected on the 1st and 14th day of storage. In addition, data obtained for the most recent human vitreous humor samples—collected 3 and 2 years before the study, presented successful discrimination of all time points studied. The method introduced was unable to detect mephedrone addition to VH in the concentration of 10 µg/cm3. Graphic abstract

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