Effects of in-Office and at-Home Bleaching on Human Enamel and Dentin: An in vitro Application of Fourier Transform Infrared Study

2008 ◽  
Vol 62 (11) ◽  
pp. 1274-1279 ◽  
Author(s):  
Feride Severcan ◽  
Kurtulus Gokduman ◽  
Ayca Dogan ◽  
Sukran Bolay ◽  
Saadet Gokalp
Keyword(s):  
Fourier Transform ◽  
Structural Changes ◽  
Protein Denaturation ◽  
Random Coil ◽  
Protein Ratio ◽  
Band Frequency ◽  
Human Enamel ◽  
Ft Ir ◽  
At Home

In-office and at-home bleaching techniques are widely used methods for the whitening of teeth. However, the safety of these techniques has not been clarified yet. The aim of the current study is to investigate the in-office- and at-home-bleaching-induced structural and quantitative changes in human enamel and dentin at the molecular level, under in vitro conditions. The Fourier transform mid-infrared (mid-FT-IR) spectroscopic technique was used to monitor bleaching-induced structural changes. Band frequency and intensity values of major absorptions such as amide A, amide I, phosphate (PO4), and carbonate (CO3−2) bands, for treatment groups and control, were measured and compared. The results revealed that both procedures have negligible effects on dentin constituents. In office-bleached enamel, in addition to demineralization, a decrease in protein and polysaccharide concentrations, mineral-to-protein ratio, and the strength of hydrogen bonds around NH groups, as well as a change in protein secondary structure were observed. The protein structure changed from β-sheet to random coil, which is an indication of protein denaturation. However, no significant variations were observed for at-home bleached enamel. The control, at-home, and in-office bleached enamel samples were differentiated with a high accuracy using cluster analysis based on FT-IR data. This study revealed that office bleaching caused deleterious alterations in the composition and structure of enamel that significantly affected the crystallinity and mineralization of the tissue. Therefore, at-home bleaching seems to be much safer than in-office bleaching in terms of molecular variations.

scholarly journals Synthesis, Characterization and Evaluation of Anti-inflammatory Activity of Novel Indoline Derivatives

2016 ◽  
Vol 12 (12) ◽  
pp. 4557-4563
Author(s):  
Dhinesh kumar Manoharan
Keyword(s):  
1H Nmr ◽  
13C Nmr ◽  
Protein Denaturation ◽  
Inflammatory Activity ◽  
Potent Inhibition ◽  
Ft Ir ◽  
Anti Inflammatory

Series of indoline derivatives were synthesized using N-(4-aminophenyl) indoline-1-carbothiamide as a precursor. The structures of synthesized compounds were confirmed by   FT-IR, 1H-NMR, 13C-NMR and LC-MS. The in vitro anti-inflammatory activity of synthesized indoline derivatives were examined by standard anti-denaturation assay. The compounds 4a (IC50 = 62.2 µg/ml) and 4b (IC50 = 60.7 µg/ml) showed potent inhibition on protein denaturation. The compounds 5a (IC50 = 97.8 µg/ml) exhibits moderate inhibition on protein denaturation

Structural Changes on Photochromism of Organic-Inorganic Hybrid Materials

1999 ◽  
Vol 604 ◽  
Author(s):  
Keiichi Kuboyama ◽  
Kazumi Matsushige
Keyword(s):  
Fourier Transform ◽  
Tungsten Oxide ◽  
Transition Metal Oxides ◽  
Photoelectron Spectroscopy ◽  
Structural Changes ◽  
Spectroscopic Measurement ◽  
Inorganic Hybrid ◽  
X Ray ◽  
Oxide Hydrate ◽  
Ft Ir

AbstractSome transition metal oxides are known to exhibit the reversible coloration phenomena. Tungsten oxide is one of such materials and exhibits the photochromism and the electrochromism. It is known that the coloration phenomena in the tungsten oxide hydrate are caused by the redox reaction. We found that the photochromic efficiency became extremely higher by addition of some organic materials to the tungsten oxide hydrate and we have studied the mechanism of such a remarkable photochromic enhancement. In some spectroscopic measurement as FT-IR (Fourier transform infrared spectroscopy) and XPS (X-ray photoelectron spectroscopy), we obtained interesting features as follows. The addition of an organic material leads to reducing the tungsten oxide hydrate to smaller pieces, that is, the surface area of the pieces that can react with the additive increases. Moreover, it was found that specific sites in the additive are oxidized when the sample colors. The fact suggests that the additives having such specific sites can enhance the photochromism of the tungsten oxide hydrate

scholarly journals Bismuth(III) bromide-thioamide complexes: synthesis, characterization and cytotoxic properties

2018 ◽  
Vol 41 (5-6) ◽  
pp. 143-154 ◽  
Author(s):  
M. Cakmak ◽  
I.I. Ozturk ◽  
C.N. Banti ◽  
M. Manoli ◽  
E. Moushi ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fetal Lung ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
Vis Spectroscopy ◽  
Normal Human ◽  
Ft Ir ◽  
Human Fetal Lung ◽  
Heterocyclic Thioamides

Abstract New bismuth(III) bromine compounds of the heterocyclic thioamides were prepared and structurally characterized. The reaction of heterocyclic thioamides with bismuth(III) bromide resulted in the formation of the {[BiBr2(μ2-Br)(MMI)2]2·CH3COCH3·H2O} (1), {[BiBr2(MBZIM)4]·Br·2H2O} (2), {[BiBr2(μ2-Br)(tHPMT)2]2·CH3CN} (3), {[BiBr2(μ2-Br)(PYT)2]2·CH3CN} (4) and {[BiBr2(μ2-Br)(MBZT)2]2 2CH3OH} (5) complexes (MMI: 2-mercapto-1-methylimidazole, MBZIM: 2-mercaptobenzimidazole, tHPMT: 2-mercapto-3,4,5,6-tetrahydro-pyrimidine, PYT: 2-mercaptopyridine and MBZT: 2-mercaptobenzothiazole). The complexes 1–5 were characterized by melting point (m.p.), elemental analysis (e.a.), molar conductivity, Fourier-transform infrared (FT-IR), Fourier-transform Raman (FT-Raman), nuclear magnetic resonance (1H and 13CNMR) spectroscopy, UV-Vis spectroscopy and thermogravimetric-differential thermal analysis (TG-DTA). The molecular structures of 1–5 were determined by single-crystal X-ray diffraction. Complex 2 is a first ionic monomuclear octahedral bismuth(III) bromide, while the complexes 1, 3–5 are the first examples of dinuclear bismuth(III) bromide derivatives. Complexes 1–5 were evaluated in terms of their in vitro cytotoxic activity against human adenocarcinoma breast (MCF-7) and cervix (HeLa) cells. The toxicity on normal human fetal lung fibroblast cells (MRC-5) was also evaluated. Moreover, the complexes 1–5 and free heterocyclic thioamide ligands were studied upon the catalytic peroxidation of the linoleic acid by the enzyme lipoxygenase (LOX).

Brushing Effect of Abrasive Dentifrices during At-home Bleaching with 10% Carbamide Peroxide on Enamel Surface Roughness

2006 ◽  
Vol 7 (1) ◽  
pp. 25-34 ◽  
Author(s):  
Luís Roberto Marcondes Martins ◽  
Claudia Cia Worschech ◽  
José Augusto Rodrigues ◽  
Gláucia Maria Bovi Ambrosano
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Enamel Surface ◽  
Tooth Bleaching ◽  
Carbamide Peroxide ◽  
Peroxide Bleaching ◽  
Human Enamel ◽  
Over Time ◽  
At Home

Abstract During tooth bleaching abrasive dentifrices might change the outer superficial enamel. The aim of this in vitro study was to evaluate the roughness of human enamel exposed to a 10% carbamide peroxide bleaching agent at different times and submitted to different superficial cleaning treatments. The study consisted of 60 sound human enamel slabs, randomly assigned to different treatment groups: G1 - not brushed; G2 - brushed with a fluoride abrasive dentifrice; G3 - brushed with a non-fluoride abrasive dentifrice; and G4 - brushed without a dentifrice. There were 15 enamel slabs per group. Slabs of molar teeth were obtained and sequentially polished with sandpaper and abrasive pastes. A perfilometer was used to obtain the mean of Ra value on the surface of each specimen to initial and experimental times. Bleaching was performed on the enamel surface for six hours daily. After that, each slab received a cleaning surface treatment and was stored in artificial saliva. Analysis of variance (ANOVA) and Tukey's HSD hoc analysis (α =0.05) revealed significant differences in roughness values over time for enamel bleached and treated with different superficial cleaning methods. G1 and G4 showed no significant differences in roughness over time, G2 and G3 showed a significant increase in the surface roughness values. This in vitro investigation showed the sole use of 10% carbamide peroxide did not alter the enamel surface roughness, but the cleaning treatments that employed the use of brushing with abrasive dentifrices resulted in a significant increase of enamel surface roughness. Citation Worschech CC, Rodrigues JA, Martins LRM, Ambrosano GMB. Brushing Effect of Abrasive Dentifrices during At-home Bleaching with 10% Carbamide Peroxide on Enamel Surface Roughness. J Contemp Dent Pract 2006 February;(7)1:025-034.

scholarly journals A Fast and Robust FTIR-ATR Coupled Chemometric Determination of Chemical and Molecular Structure of Wheat (Triticum aestivum L.) under a Series of Microbial Fermentation Processes

2021 ◽  
Vol 78 (1) ◽  
pp. 64
Author(s):  
Sulhattin YASAR ◽  
Ramazan TOSUN
Keyword(s):  
Lactic Acid ◽  
Phytic Acid ◽  
Crude Protein ◽  
Structural Changes ◽  
Spectroscopic Method ◽  
Triticum Aestivum L ◽  
Random Coil ◽  
Microbial Fermentation ◽  
Nutrient Contents ◽  
Ft Ir

This study aimed to ferment wheat grain by optimised bacteria, yeast and fungal fermentations. Crude protein, tannin, phytic acid and lactic acid contents of samples taken at 24 h intervals determined by chemical methods were compared with those of infrared (IR) spectro-chemometry. Secondary protein components were further quantified with IR spectra deconvolution method. The results indicated that some fermentations increased crude protein of wheat, whilst its tannin and phytic acid degraded in all fermentations. Wheat enriched with lactic acid content in all fermentations. FT-IR spectroscopic method accurately (99.99% of recovery) and precisely (regression coefficient of prediction R2 = 0.999, P <0.0001) predicted these nutrient contents. Fermentation positively caused a re-organised secondary protein conformation; the percentages of β-sheet and α-helix increased by 68 and 140%, respectively, whereas the random coil decreased by 63%. FT-IR spectrometry combined with suitable chemometric tools provided a fast and robust monitoring of chemical and structural changes during microbial fermentation.

scholarly journals Fourier-Transform Infrared Microspectroscopy (FT-IR) Study on Caput and Cauda Mouse Spermatozoa

Proceedings ◽  
2019 ◽  
Vol 42 (1) ◽  
pp. 19 ◽  
Author(s):  
Marianna Portaccio ◽  
Sonia Errico ◽  
Teresa Chioccarelli ◽  
Gilda Cobellis ◽  
Maria Lepore
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Biochemical Changes ◽  
Infrared Microspectroscopy ◽  
Fourier Transform Infrared Microspectroscopy ◽  
In Vitro Investigation ◽  
Ft Ir ◽  
Protein Nucleic Acid ◽  
Ir Study

Fourier-Transform Infrared micro-spectroscopy (µFT-IR) was used for an in vitro investigation on spermatozoa (SPZ) samples separately collected from caput and cauda of mouse epididymis. SPZ are characterized by deep biochemical changes during the transit along the epididymis and they can constitute ideal candidates for a µFT-IR investigation, thanks to the ability of this technique in analyzing cells at a molecular level. Appreciable differences were reported in the infrared spectra from caput and cauda SPZ, and biochemical changes in protein, nucleic acid, lipid, and carbohydrate content of cells were evidenced. The present investigation indicates that µFT-IR can constitute a valuable tool for monitoring, in an easy and fast way, the changes suffered by SPZ during the transit along the epididymis.

Use of Attenuated Total Reflection—Fourier Transform Infrared Spectroscopy to Measure Collagen Degradation in Historical Parchments

2008 ◽  
Vol 62 (10) ◽  
pp. 1108-1114 ◽  
Author(s):  
Lee Gonzalez ◽  
Tim Wess
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Conformational Changes ◽  
Structural Changes ◽  
Fourier Transform Infrared ◽  
Collagen Degradation ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Developing a noninvasive method to assess the degraded state of historical parchments is essential to providing the best possible care for these documents. The conformational changes observed when collagen molecules, the primary constituent of parchment, unfold have been analyzed using attenuated total reflection–Fourier transform infrared (ATR-FT-IR) spectroscopy and the nanoscopic structural changes have been analyzed using X-ray diffraction (XRD). The relationship between the results obtained from these techniques was studied using principal component analysis, where correlation was found. The extent of gelatinization of historical parchments has been assessed using ATR-FT-IR and XRD and the frequency shifts observed as collagen degrades into gelatin have been reported. These results indicate that collagen degradation can be measured noninvasively in parchment and demonstrate the utility of ATR-FT-IR spectroscopy as a method to investigate historical documents.

Fourier transform infrared spectroscopy as a tool for identification of crude microbial extracts with anti-malarial potential

2016 ◽  
Vol 61 (1) ◽  
Author(s):  
P. Sankarganesh ◽  
Baby Joseph
Keyword(s):  
Fourier Transform ◽  
Functional Group ◽  
Fourier Transform Infrared ◽  
Biologically Active ◽  
Crude Extracts ◽  
Microbial Extracts ◽  
Ft Ir ◽  
Indispensable Tool ◽  
Ft Ir Spectroscopy

AbstractFourier transform infrared (FT-IR) spectroscopy is an indispensable tool for identifying biologically active functional groups in uncharacterized crude samples. Here, using FT-IR spectrum analysis, we identified crude extracts of Streptomyces that have anti-malarial activities and conducted a statistical analysis of their spectra. Among the three crude microbial extracts tested herein, an aromatic amine C-N stretching functional group was observed in the spectra of Streptomyces sp. BJSG1 and BJSG4 crude extracts. These extracts showed promising activity against Plasmodium falciparum in vitro cultures with IC

scholarly journals The Effectiveness of Durian Peel as a Multi-Mycotoxin Adsorbent

Toxins ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 108 ◽  
Author(s):  
Saowalak Adunphatcharaphon ◽  
Awanwee Petchkongkaew ◽  
Donato Greco ◽  
Vito D’Ascanio ◽  
Wonnop Visessanguan ◽  
...  
Keyword(s):  
Surface Area ◽  
Structural Changes ◽  
Agricultural Waste ◽  
Fumonisin B1 ◽  
Maximum Adsorption Capacity ◽  
Inorganic Pollutant ◽  
Ft Ir ◽  
Mycotoxin Adsorbent ◽  
Dose Dependent

Durian peel (DP) is an agricultural waste that is widely used in dyes and for organic and inorganic pollutant adsorption. In this study, durian peel was acid-treated to enhance its mycotoxin adsorption efficacy. The acid-treated durian peel (ATDP) was assessed for simultaneous adsorption of aflatoxin B1 (AFB1), ochratoxin A (OTA), zearalenone (ZEA), deoxynivalenol (DON), and fumonisin B1 (FB1). The structure of the ATDP was also characterized by SEM–EDS, FT–IR, a zetasizer, and a surface-area analyzer. The results indicated that ATDP exhibited the highest mycotoxin adsorption towards AFB1 (98.4%), ZEA (98.4%), and OTA (97.3%), followed by FB1 (86.1%) and DON (2.0%). The pH significantly affected OTA and FB1 adsorption, whereas AFB1 and ZEA adsorption was not affected. Toxin adsorption by ATDP was dose-dependent and increased exponentially as the ATDP dosage increased. The maximum adsorption capacity (Qmax), determined at pH 3 and pH 7, was 40.7 and 41.6 mmol kg−1 for AFB1, 15.4 and 17.3 mmol kg−1 for ZEA, 46.6 and 0.6 mmol kg−1 for OTA, and 28.9 and 0.1 mmol kg−1 for FB1, respectively. Interestingly, ATDP reduced the bioaccessibility of these mycotoxins after gastrointestinal digestion using an in vitro, validated, static model. The ATDP showed a more porous structure, with a larger surface area and a surface charge modification. These structural changes following acid treatment may explain the higher efficacy of ATDP in adsorbing mycotoxins. Hence, ATDP can be considered as a promising waste material for mycotoxin biosorption.

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