Extract, determination

Phenylurea herbicides (urons). Dinocap, Dinoseb, Benomyl, Carbendazim and Metamitron in Waters [e.g. determination of phenylurea herbicides by reverse phase HPLC, phenylurea herbicides by dichloromethane extraction, determination by GC/NPD, phenylurea herbicides by thermospray LC-MS, Dinocap by HPLC, Dinoseb water by HPLC, Carbendazim and Benomyl (as Carbendazim) by HPLC], 1994... 

Obtained from protein isolation, not heterologously expressed Determined by purified Cannabis extract Determined by recombinant proteins isolates... 

Concentration was another confounding factor. When using crude extracts determination of the concentrations of individual components... 

Experiment 37 Solid-Liquid Extraction Determination of Nitrite in Hot Dogs... 

Procedure. Carry out the extraction and then determine phosphorus as in Method 5.9a, except that working standard solutions should be made up in the Mehlich 1 extractant. Determine potassium and magnesium as in Method 5.10, except that standards are made up in Mehlich 1 extractant. Determine calcium as in Method 5.2, except that standards are made up in Mehlich 1 extractant. The composition of composts is so variable that appropriate dilutions of extracts may be required, and calculations adjusted accordingly. 

In another method for the determination of sulfamethazine in muscle and liver tissues (59), the extraction problem was successfully addressed by applying a matrix solid-phase dispersion procedure for rapid and efficient purification of the tissue extracts. Determination was made by ELISA on the basis of antibodies raised against sulfamethazine-diazo-bovine serum albumin conjugates. 

Pierson s Procedure D— 5. Treatment of Water Extract—Determination of Salts (Ref 11, pp 1357—59 Ref 17, Methods D90—5ato D9O—5f). Compare with Section 111, steps 4 to 12 of this work... 

Extraction, determination of structures, partial or total synthesis of the simple or complex heterocyclic derivatives constituting the natural benzofuran derivatives of vegetable origin. 

Floyd and Sommers [142] evaluated a simple one-step digestion procedure for extracting total mercury from soils. The sample was digested with concentrated nitric acid and 4N potassium dichromate for four hours at 55 °C and the mercury in the extract determined by flameless atomic absorption spectrometry. The method can be applied to soils containing up to 20% organic matter. 

Bums, D.T., M. Harriott, and F. Glockling. 1987. The extraction, determination and speciation of tribu-tyltin in seawater. Fresenius J. Anal. Chem. 327 701-703. 

Serrano, A. and M. Gallego. 2006. Continuous microwave-assisted extraction coupled on-line with liquid-liquid extraction Determination of aliphatic hydrocarbons in soil and sediments. J. Chromatogr. A 1104 323-330. 

The methods described above have been used principally to quantify FFAs in cheese, but can be used for other milk products with some slight modifications. All the above methods use internal standards (typically FFAs which are not present in milk fat), and the recovery of all FFAs is based on the recovery of these internal standards. It is best to use both volatile and non-volatile FFAs as internal standards. Currently, the International Standard for the extraction of lipids and lipo-soluble compounds from milk and milk products is ISO 14156 (ISO, 2001) and involves solvent extraction. Determination of the fatty acid composition of milk fat involves the preparation of fatty acid methyl esters (FAME) by transesterification (ISO, 2002a), followed by quantification by GC (ISO, 2002b). 

Ether Extracts Determine as directed in Ether Extracts under Colors, Appendix IIIC. 

Water-Soluble Annatto Extracts Determine as directed under Oil-Soluble Annatto Extracts (above), but dissolve the sample in 0.1 M sodium hydroxide, and measure the absorbance at 453 nm. 

Ether Extracts Determine as directed in Ether Extracts under Colors, Appendix MC, using a solution with a pH of not less than 7. 

Some attempts are being made to model the supercritical extraction of natural products. Most of the models proposed consider the rate of extraction determined by the rate of mass transfer out of the matrix the solute is present in small amounts in the matrix, and during extraction the concentration of the solute in the supercritical fluid is well below the solubility limit (Brunner, 1984 Bartle et al, 1990 Reverchon et al, 1993 and Catchpole et al, 1994). 

Hydrochloric acid extraction, determination by atomic absorption spectrome-try. 

Wt % was obtained from each benzene-ether extract. Determination was made from the gas chromatograms of their methyl esters. Thiophene- and pyridine carboxylic acids for Samples 2-6, and pyridine tricarboxylic acids for Sample 1. 

To develop the simpler skills and technics necessary in the study of this particular fidd of experimental science. In order to prepare and study organic compounds it is often necessary to perform distillations, crystallizations, extractions, determinations of melting points, and other operations. Therefore, a number of these operations are introduced at the beginning. 

Analyze the supernatant from your peptide isolation procedure using atomic absorption spectroscopy. Follow the directions for your particular instrument. Assuming 100% extraction, determine the amount of Cd taken up by the yeast. Make dilutions of your supernatant as needed using ddH20. 

Essential oils and aromatic extracts - Determination of residual benzene content... 

CONTENT OF ATROPINE, SCOPOLAMINE AND TOTAL ALKALOIDS IN BELLADONNA EXTRACTS DETERMINED BY... 

For evaluation of the selectivity of two metal species separation we can assume that in the same solution environment (water) the diffusion coefficients of these metal ions with the same charge have similar values and the diffusion coefficients of the metal-carrier complexes have similar values. Thus, we can represent separation factor as dependent only on the distribution coefficients at forward and backward extraction, determined experimentally through distribution coefficients at membrane-based equihbrium forward, Ep/E, and backward, Ee/r, extraction [15, 58] ... 

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