Extraction and stability

ABOUT EXTRACTION AND STABILITY OF HEXAVALENT CHROMIUM IN SOILS AND FERTILIZERS... 

Bautista-Ortin. A.B., Improving color extraction and stability in red wines the use of maceration enzymes and enological taimins, Int. J. Food Sci. Technol., 40, 1, 2005. 

Pectinases find industrial application in the food-industry during the extraction and stabilization of juices. Grape must contains pectins that are frequently removed by the action of fungal pectinases. It would, however, be preferable to use Saccharomyces cerevisiae yeast strains that could produce pectinases. 

In these mixtures the catena-tvistibines are by far the most abundant chain species and even under favorable conditions [excess of cyc/6>-(RSb) ] the caten -tetrastibines form only as minor components. Nevertheless, recently the selective extraction and stabilization of these tetrastibines in the coordination sphere of a transition metal carbonyl complex was achieved by reacting mixtures of distibines and cyclostibines with... 

Pectase was found in plants, both in soluble and non soluble form. It was able to break down pectose into pectinic acid, and was attributed some similarity to diastase. Neither materials could be crystallized (Payen, 1874). Claude Bernard was the first to show lipolytic activity in pancreas in 1856 (Tauber, 1949), and Dobell (1869) found that an extract from pancreas hydrolyzed both fat and starch he gave a procedure for extraction and stabilization and named this preparation pancreatine . 

Pamukcu, S., Weeks, A. and Wittle, J. K. (1997) Electrochemical Extraction and Stabilization of Selected Inorganic Species in Porous Media, Journal of Hazardous Materials, Special Issue on Electrochemical Decontamination of Soil and Water, Edited by Y.B. Acar and A.N. Alshawabkeh, V. 55, No s. 1—3, pp. 1-22. 

Pamukcu S, Weeks A. (1997). Electrochemical extraction and stabilization of selected inorganic species in porous media. Journal of Hazardous Material 55 305-318. 

Manthei [2005] demonstrates the apphcation of the moment tensor method to analyse automatically this huge amount of AE events. The automatic procedure was separated into source location, data extraction, and stability checking of the inversion calculation. The effectiveness of automated evaluation procedures is listed in Table 11.4. This table presents the number of events evaluated with various automatic procedures. 

Pizarro, I. G6mez, M. Camara, C. Palacios, M.A. Arsenic speciation in environmental and biological samples Extraction and stability studies. Anal. Chim. Acta 2003, 495(1), 85. 

The nse of a high ionic strength acidic extraction solvent is required to suppress metabolic activity upon disrnption of the cell and to precipitate proteins. A metal chelator snch as ethylenediaminetetraacetic acid (EDTA) is also usually required. The use of metaphosphoric acid is the best way to extract and stabilize L-ascorbic acid, as suggested by various authors [72,78,80,81]. For this reason, the samples were extracted with 3% metaphosphoric acid-8% acetic acid-1 mM EDTA solution, which is known to limit L-ascorbic acid degradation to less than 5% [82]. 

Table 22.3 Lithium Reserves (in t) Differentiated According to Ease of Extraction and Stability of Countries. (For color version, refer to the plate section.)...

On the other hand, an obvious advantage of offline TLC-MS is the broad list of chemicals, which can be used in the course of the analysis. For example, there are practically no limitations to the solvents that are used for reextraction of analytes from the chromatographic adsorbent. Many MS noncompatible solvents and buffers (phosphate buffer and triethylammonium acetate, for instance) can readily be used for optimal extraction and stability of analytes, as long as they are removed prior to MS analysis. This way, and if care is exercised, labile compounds can be transferred from the TLC plate to the MS with negligible analyte loss, although the overall TLC-MS analysis can still be time consuming. Additionally, analytes extracted from the plates can be redissolved in a minimal amount of solvent used... 

Fera, A., Alriani, G. N. Extraction and Stability of Anthocyanin from Btmi Fmits (Antidesma Bimius L) as an Alternative Natural and Safe Food Colorants. J. FoodPharmaceut. Sci. 1(2) 2013. 

Many cereal endosperm storage proteins—especially glutelins— are, in their native forms, disulfide-bonded oligomers or polymers. Even if soluble, such proteins may resolve poorly upon RP-HPLC and elute as broad peaks [22], in part due to their many possible polymeric forms. Reduction is necessary to release disulfide-bonded subunits from cereal glutelins or oligomeric prolamins for analysis [19,32,42,76]. Thus, protein resolution, extractability, and stability are often improved by extraction under reducing conditions. To prevent reoxidation and further enhance resolution, resulting cysteine residues may be stabilized by alkylation, usually with 4-vinylpyridine [19,21,29,70,76]. 

Dreyer, S. Kragl, U. (2008). Ionic liquids for aqueouis two-phase extraction and stabilization of enzymes. Biotechnol. Bioeng. 99 (6) 1416-1424... 

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