FT-IR micro-spectroscopy of fine-grained planetary materials: further results

We present data from FT-IR microspectroscopy of olivines in a thin section of the LL3.6 ordinary chondrite Parnallee. Results are discussed and compared with other methods of FT-IR microspectroscopy

Structural characterisation of pre-processed thermoplastic protein derived from bloodmeal

Additives are required to convert bloodmeal powder into an extrudable thermoplastic protein-based bioplastic. These include a protein denaturant, a surfactant, a reducing agent and plasticisers. The objective of this work was to assess the structural changes induced in bloodmeal by these additives prior to extrusion. Structure was investigated using Fourier transform infrared (FT-IR) spectroscopy, wide angle X-ray scattering (WAXS) and synchrotron light based FT-IR microspectroscopy. FT-IR results suggested the additives reduced α-helical content. The shape of the amide I region (1600 – 1700 cm⁻¹, representing carbonyl group stretching in the protein backbone) is known to depend on protein secondary structures. Bloodmeal showed a broad, convoluted peak in this region, with a maximum in the range 1648 – 1658 cm⁻¹, associated with α-helices. With processing additives, a dip was seen in the α-helix region, with twin peaks emerging either side of it. Urea, one of the additives, also absorbs in the amide I region and may also contribute to a change in its shape. Analysis of the amide 3 region supported a reduction in the ratio of α helices to β sheets. Further support of structural changes was shown by WAXS. The additives decreased the sharpness of peaks corresponding to 4.8 Å and 10 Å, thought to represent intra-helix spacing and inter-helix packing respectively. FT-IR microspectroscopy at the Australian Synchrotron enabled spatial variations in secondary structure to be explored using peaks in the amide 3 region. Spatial distribution of secondary structure was detected in bloodmeal and thermoplastically modified bloodmeal prior to extrusion (PPM-TEG). Bloodmeal showed domain separation on the approximate order of 10 μm, whilst PPM-TEG appeared to have larger phases and overall reduced α-helical content, relative to beta sheets

Chemical and structural characterization of fibrous richterite with high environmental and health relevance from Libby, Montana (USA)

This study reports new structural and spectroscopic data of a sample of fibrous richterite from Libby, Montana (USA). The OH-stretching region was investigated by FT-IR. The spectrum showed, except for the typical absorption band at 3671 cm-1 assigned to the vibration of the O-H dipole bonded to three [6]Mg cations, a well developed band at 3658 cm-1 attributed to the M(1)+M(3)Fe2+ environment. The M(1)+M(3)Fe2+ occupancy calculated using the FT-IR data is in very good agreement with that obtained combining Mössbauer and EMP data. Fe3+ was only assigned at M(2) owing to the absence in FT-IR spectrum of absorption bands at Δ=-50 cm-1 from the tremolite reference band. Structural investigation was done by X-ray powder-diffraction using the Rietveld method. Cell parameters, fractional coordinates for all non-hydrogen atoms, and site scattering for M(1), M(2), M(3), M(4) and A were refined. The most relevant difference with respect to prismatic winchite is a general reduction of the cell parameters that is ascribed mainly to the higher fluorine content of fibrous richterite. Possible site occupancies were obtained by combining chemical data and Rietveld refinement results

ANALISIS SPEKTROFOTOMETRI UV-VIS DAN FT-IR DARI SENYAWA HASIL ISOLASI EKSTRAK KLOROFORM KULIT BATANG TUMBUHAN SALAM (Syzygium polyanthum)

Abstrak. Tujuan dari penelitian ini adalah untuk mengetahui golongan senyawa dari hasil isolasi ekstrak kloroforom kulit batang tumbuhan salam  menggunakan spektrofotometri UV-Vis dan FT-IR. Setelah dilakukan isolasi dan dianalisis dengan menggunakan spektrofotometer UV-Vis dan FT-IR, pada spektrofotometer UV-Vis menunjukkan adanya serapan pada 217nm yang merupakan gugus kromofor (C=C) dan pada 270 nm yang menunjukkan adanya ikatan rangkap C=O. Hal ini didukung oleh hasil spektrofotometer FT-IR yang menunjukkan gugus fungsi –OH,=C-H (aromatik), C=O, C=C (aromatik). Golongan senyawa yang terdapat pada isolat adalah senyawa golongan fenolik.  Kata kunci: Syzygium polyanthum, Spektrofotometri UV-Vis, Spektrofotometri FT-IR, fenolik.  Abstract. The purpose of this research is to determine the compounds of the isolated from chloroform extract of plant salam bark using UV-Vis and FT-IR spectrophotometry. After isolation and analyzed by using the UV-Vis, and FT-IR spectrophotometry, the UV-Vis spectrophotometry showing absorption at 217 nm which is a chromophore group (C=C), and 270 nm indicating  a double bond C=O. There are supported by the result of FT-IR spectrophotometry showing the functional groups  –OH,=C-H (aromatic), C=O, C=C (aromatic). The compound found in isolate salam predicted to be is phenolic compounds.  Keyword:Syzygium polyanthum,UV-Vis spectrophotometry, FT-IR spectrophotometry, phenolic

Study of Solid-State Radiolysis of Behenic, Fumaric, and Sebacic Acids for their Possible Use as Gamma Dosimeters Measured Via ATR-FT-IR Spectroscopy

The intensive use of ionizing radiation has promoted the constant investigation of adequate dosimetric systems in the measurement of doses applied in irradiated products. The objective of this work is to propose gamma dosimetric systems, using carboxylic acids in a solid state and measuring the change via infrared spectroscopy (carboxylic acid/ ATR-FT-IR1). We worked with three systems: (1) behenic acid/ATR-FT-IR, (2) sebacic acid/ATR-FT-IR, and (3) fumaric acid/ATR-FT-IR. The change in absorbance corresponding to the stretching vibration frequency of the carbonyl group to the absorbed dose (in the range of kGy) was measured. The results showed that the acid/ATR-FT-IR systems have a linear response with respect to the absorbed dose, for behenic acid/ATR-FT-IR from 0 to 122 kGy, for ATR-FT-IR sebacic acid from 0 to 61 kGy, and for fumaric acid/ATR-FT-IR from 0 to 34 kGy. The results indicated that the linear response of the absorbance dose in the three systems allows us to continue studying other variables to be able to propose them as chemical dosimeters

Preparation and characterization of biopolyol from liquefied oil palm fruit waste: part 2

Oil palm fruit waste (OPFW) was conducted using polyhydric alcohol (PA) as liquefaction solvent with H2SO4 in three different OPFW/PA ratio (1/2, 1/3 and 1/4). During the liquefaction, cellulose, semi-cellulose and lignin are decomposed, which results in changes of acid value and hydroxyl value. The liquefied OPFW were characterized by Fourier Transform infrared (FT-IR) spectroscopy. The hydroxyl and acid values of the liquefied oil palm fruit waste (OPFW) varied with the liquefied conditions. It was observed that with an increase in the liquefaction solvent (PA) amount in the mixture resulted in a high acid value and hydroxyl value for the OPFW. FT-IR spectroscopy analysis showed that the resulting biopolyol was suitable monomer for polyurethane (PU) synthesis for the production of PU foams

Assessing the Potential of FT-IR to Identify Clinical Strains of Candida spp

Produto de um estágio curricular21 clinical isolates of Candida spp were examined by FT-IR in order to compare identification using FT-IR with biochemical identification (bioMerieux®). FT-IR revealed itself as a fast and effective method for identification of the strains tested as all were placed into the appropriate species, including one which was misidentified by the biochemical method.Instituto Nacional de Saúde Doutor Ricardo Jorg

2-{2,6-Bis[bis(4-fluorophenyl)methyl]-4-chlorophenylimino} -3-aryliminobutylnickel(II) bromide complexes: Synthesis, characterization, and investigation of their catalytic behavior

The series of 2-{2,6-bis[di(4-fluorophenyl)methyl]-4-chlorophenylimino}-3- aryliminobutane derivatives (L1-L5) and their nickel(II) dibromide complexes (Ni1-Ni5) were synthesized, and all organic compounds were fully characterized by the Fourier transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy and by elemental analysis, while the nickel complexes were characterized by FT-IR spectroscopy, elemental analysis, as well as by single-crystal X-ray diffraction for two representative examples, namely Ni1 and Ni4. A distorted tetrahedral geometry was observed for these four-coordinate nickel complexes. Upon the activation with either Methylaluminoxane or modified methylaluminoxane as co-catalyst, all nickel complex precatalysts showed very high activity toward ethylene polymerization with activities of up to 10 7 g(PE)·mol -1 (Ni)·h -1 , and afforded highly branched polyethylene with a bimodal distribution. © 2014 Elsevier B.V

DETERMINASI DAN ANALISIS FINGER PRINT TANAMAN MURBEI (Morus alba Lour) SEBAGAI BAHAN BAKU OBAT TRADISIONAL DENGAN METODE SPEKTROSKOPI FT-IR DAN KEMOMETRIK

DETERMINASI DAN ANALISIS FINGER PRINT TANAMAN MURBEI (Morus alba Lour) SEBAGAI BAHAN BAKU OBAT TRADISIONAL DENGAN METODE SPEKTROSKOPI FT-IR DAN KEMOMETRIK Abd.Halim Umar1), Reny Syahruni1), Asril Burhan1), Fadillah Maryam1), Astuti Amin2), Marwati2), Lisa Rassang Masero2) 1)Akademi Farmasi Kebangsaan Makassar 2)Sekolah Tinggi Ilmu Farmasi Makassar   ABSTRACT Mulberry (Morus albaLour) is amedicinal plant that is widely grown and used as medicine in Indonesia. Composition chemistry contained in the drug of nature is one composition complex, can be determined by using a spectroscopic methods. This study to determination origin mulberry that comes from some areas as information and quality control using a method Fourier TransformInfra-Red Spectroscopy (FT-IR) and chemometrick. FT-IR analysis of mulberry (Morus albaLour) that grow in different places in geography, obtained results are relatively similar spectrum of 9 types of the samples. FT-IR measure ments combined with chemometrick. Group 1 (Cendana), group 2 (Baraka and Palangga), group 3 (Kalambe 'and Cina), Group 4 (Tikala and Bori), group 5 (Lemo) and group 6 (Solie). Key words: Mulberry, FT-IR, PCA, Chemometrick ABSTRAK Murbei (Morus alba Lour) merupakan salah satu tanaman obat yang banyak tumbuh dan digunakan sebagai obat tradisional di Indonesia. Komposisi kimia yang terkandung dalam obat bahan alam merupakan suatu komposisi yang kompleks, dapat ditentukan dengan menggunakan metode spektroskopi. Penelitian ini untuk mendeterminasikan asal murbei yang berasal dari beberapa daerah sebagai informasi dan kendali mutu dengan menggunakan metode Fourier Transform-Infra Red Spectroscopy (FT-IR) dan kemometrik. Analisis FT-IR tanaman murbei (Morus alba Lour), diperoleh hasil spektrum yang relatif sama dari 9 jenis sampel dari daerah yang berbeda. Spektrum  FT-IR yang diperoleh dikombinasikan dengan metode kemometrik menggunakan program Minitab versi 16 dan The Unscrambler® 9.7. Hasil pengelompokan yaitu,  Kelompok 1 (Cendana), Kelompok 2 (Baraka dan Palangga), Kelompok 3 (Kalambe’ dan Cina), Kelompok 4 (Tikala dan Bori), Kelompok 5 (Lemo) dan Kelompok 6 (Solie).     Kata kunci : Murbei, FT-IR, Kemometri