Fourier transform spectroscopy

Using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) images and spectra were obtained from various samples of silica and platinum on silica. Each sample contains unique structures which were prepared by etching the surface of silica in different conditions. A scanning electron microscope is a type of electron microscope that produces images of topography and composition by scanning a sample with a focused beam of electrons. Samples can be observed in high vacuum,…

wavelengths gives information on the molecules interactions with its surrounding moieties (Paschalis, 2009). FTIR (Fourier Transform spectroscopy) spectra offer information on all tissues components (Wen et al. 2009). Human proteins and mineral constituents give intense, structure sensitive to infrared radiation modes (Paschalis, 2009). Figure 1, is an example of Fourier Transform spectrum of bone powder (Paschalis,…

for separating the 100 % agave tequilas from the mixed ones. The purpose of this study was to examine the composition of various samples of authentic tequila purchased in Mexico and Germany using ion chromatography (IC) and Fourier transform infrared (FTIR) spectroscopy. It was expected…

B Sridhar et al (2012) studied Purification and Characterization of Biosurfactants. The emulsifications of biosurfactants were checked in various oils such as olive, coconut, sunflower and rice bran oils, the emulsification activity of biosurfactants. Pseudomonas aeruginosa had higher emulsification activity than Saccharomyces cerevisiae. While checking the sugar and lipid content in biosurfactants by phenol sulphuric acid method and vanillin reagent method, found high in Pseudomonas aeruginosa…

Fourier Transform Infrared Spectroscopy (FTIR) It is one of the classical techniques used routinely to derive information regarding the various bond types, the presence of different functional groups and interaction among them. FTIR spectroscopy provides opportunities to identify the unknown materials. In infrared spectroscopy the infrared radiations are passed through a sample. A portion of the radiation is absorbed…

The development of new drug discovery technologies like high throughput screening, combinatorial chemistry, etc. has led to the discovery of a large number drugs that are poorly water soluble.(1,2) Approximately 40% of the NCEs are poorly water soluble and has poor bioavailability.(3) The successful clinical use of these molecules requires the application of solubility enhancement based formulation approaches. Among the various solubility enhancement technique like use of cosolvents,…

Nuclear magnetic resonance (NMR) spectroscopy and imaging can be used to investigate, noninvasively, a wide range of biological processes in systems as diverse as protein solutions, single cells, isolated perfused organs, and tissues in vivo. It is also possible to combine different NMR techniques enabling metabolic, anatomical, and physiological information to be obtained in the same experiment. This review provides a simple overview of the basic principles of NMR and outlines both the…

CHAPTER 4 RESULT AND DISCUSSION 4.1 Preparation of Bis-Thiourea Derivatives The mixture of heptanoyl chloride and ammonium thiocynate with 1,4-phenylene diamine appeared as homogeneous solution. White precipitate was formed immediately when the solution was filtered into the beaker containing ice cubes. Then, the precipitate was filtered again and rinsed by ethanol before being dried in the desiccator. The physical data of the synthesized bis-thiourea derivatives are shown in Table 4.1.…

Esters have a very sweet fruity smell. Esters are commonly used in the preparation of artificial flavors or fragrances. Flavors and fragrances may utilize a single ester or a mixture of esters and other substances to duplicate the odor and flavor of a particular fruit. Naturally occurring esters are found in fruits. An ester is a product of the reaction of an acid (carboxylic acid) and an alcohol (the hydrogen of the acid R-COOH is replaced by an alkyl group R'). Esters mainly result…

spectrophotometric method is discussed. The spectrophotometry is a method that involve in infrared spectrum and a quantitative measurement of the reflection of a material and it represent as a function of wavelength. Thus the infrared spectroscopy (IR spectroscopy) is the spectroscopy that deals with the infrared region of the electromagnetic spectrum that is, light with a longer wavelength and lower frequency than visible light. Infra-red spectrum is usually divided into 3 spectral regions…