Microclinical Analysis

Amino acids (AA) have also been studied on microdevices for development of microclinical analysis devices. In urine, normal ranges for standard amino acids and their metabolites range from 0 to 24 mM, with abnormal concentrations indicative of a number of disease states. Plasma concentrations of certain amino acids can also be used for disease detection. Elevated homocysteine levels in plasma is an independent risk factor for cardiovascular disease. Microdevices employing end-column amperometric detection were used for the determination... 

The formation of amorphous volatile products during carbothermal reduction processes can cause problems by condensing in the cooler parts of the furnace and altering the composition of the original mixture. Al NMR shows that these amorphous phases all contain Al solely in tetrahedral coordination, with chemical shifts consistent with the potassium feldspars microcline and sanidine (54-58 ppm). Thermodynamic analysis confirmed the feasibility of vapour-phase transport of both Al and alkali metal impurities from the clay which can then condense to form short-range feldspar-like units (Ekstrom et al. 1996). 

Harrison TM, Be K (1983) Ar-40/Ar-39 age spectrum analysis of detrital microclines from the Southern San-Joaquin Basin, California—An approach to determining the thermal evolution of sedimentary basins. Earth Planet Sci Lett 64 244-256... 

Figure 5.8 Analysis of the infrared spectrum of a mineral, (a) Sample spectrum 50% albite (k-feldspar) 23% siderite 17% illite 10% chlorite, (b) Calculat spectrum 49.7% feldspar (8.0% albite, 13.2% orthoclase and 28.5% microcline) 25.2% siderite 19.0% illite 6.8% chlorite, (c) Residnal difference spectrum. From Brown, J. M. and Elliot, J. J., The Quantitative Analysis of Complex, Multicomponent Mixtures by FTIR the Analysis of Minerals and of Interacting Organic Blends , in Chemical, Biological and Industrial Applications of Infrared Spectroscopy, Durig, J. R. (Ed.), pp. 111-125. Copyright 1985. John Wiley Sons Limited. Reproduced with permission.

---