Liquids, sample preparation

Sample Preparation. Liquid crystalline phases, i.e. cubic and lamellar phases, were prepared by weighing the components in stoppered test tubes or into glass ampoules (which were flame-sealed). Water soluble substances were added to the system as water solutions. The hydrophobic substances were dissolved in ethanol together with MO, and the ethanol was then removed under reduced pressure. The mixing of water and MO solutions were made at about 40 C, by adding the MO solution dropwise. The samples for the in vivo study were made under aseptic conditions. The tubes and ampoules were allowed to equilibrate for typically five days in the dark at room temperature. The phases formed were examined by visual inspection using crossed polarizers. The compositions for all the samples used in this work are given in Tables II and III. 

Sample Preparation Liquid Samples, Extracts, and Solutions of Solids... 

Samples Requiring no Sample Preparation Liquid (Water)... 

Sample preparation. Liquid and cream samples dissolved by boiling with acetone or chloroform. 

Infrared Sample Preparation Liquid Samples Solid Samples... 

Techniques to Facilitate the Performance of Mass Spectrometry Sample Preparation, Liquid Chromatography, and Non-Mass-Spectrometric Detection... 

A radiometric method utilizing liquid scintillation counting has been developed which can assist in evaluation of the presence and degree of adulteration of plant extraction material with its synthetic counterpart. The basis of the method is the measurement of the decrease in the ambient radiocarbon level of the plant material caused by the addition of petroleum derived synthetic material. Cinnamic aldehyde used for evaluating the quality of cinnarmn, and caffeine extracted from tea and coffee are two products which lend themselves well to this method of analysis. The procedures for sample preparation, liquid scintillation counting and accuracy in evaluating product adulteration are discussed. 

Is the polymer matrix as claimed Infra-red analysis is a good technique for this determination. IR spectra can be obtained quickly with minimum sample preparation. Liquids and films can be run directly. The dust from filing a solid sample can be ground with potassium bromide (KBr) and a pellet pressed for analysis. Is the additive readily apparent in the spectrum ... 

Sample preparation Liquid-liquid extraction of 1 mL basified plasma (not otherwise specified), inject an 80 p,L aliquot of the supernatant. 

Sample preparation Liquid/liquid extraction 10 g of sample, 100 mL methylene chloride Qean-up by gel chromatography, alumina/silica, or Florisil column... 

Sample preparation Liquid/liquid extraction 15 g powdered sample 15 mL acetonitrile containing 1% acetic acid Vortex with 3 g MgSO, 1.5 g NaOAc, 10 g NaQ, centrifuge Shake 1 mL supernatant with 200 mg PSA and 10 mg GCB, centrifuge Inject from supernatant... 

Sample preparation Liquid extraction Dissolution of the plastic material, methanol liquid extraction Liquid extraction with acetone (clays, plush, paper toys)... 

Sample preparation Liquid extraction 10 g fish tissue, homogenized, (1 g for fish feed) Add recovery ISTDs BDE 37 (3,4,4 -TriBDE), c -PCB 77 (3,3, 4,4 -TetraCB, 77 L) Mix with 5 mL distilled water (14 mL distilled water for fish feed) Shake with 10 mL ethyl acetate Add 4 g anhydr. MgSO, 2 g NaCl, shake, centrifuge... 

M. Hayward, M. D. Bacolod, Q. P. Han, M. Cajina and Z. Zou, Techniques to Facilitate the Performance of Mass Spectrometry Sample Preparation, Liquid Chromatography, and Non-Mass-Spectrometric Detection, in Mass Spectrometry in Drug Metabolism and Disposition Basic Principles and Applications, ed. M. S. Lee and M. Zhu, John Wiley Sons, Inc., Hoboken, N. J., 2011, p. 353. 

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