Sample compound

Compound Sample concentration, ppm Recovery, % Standard deviation... 

The number of samples to be processed for every batch produced six samples of 13 tablets each are taken at prescribed times after starting the tablet press (10 tablets are ground and well mixed (= compound sample), two average aliquots are taken, and each is extracted) the additional three tablets are used for content uniformity testing this gives a total of 6 (2 -t- 3) = 30 determinations that have to be performed. 

The mean content must be 98-102% for nine out of 10 compound samples... 

Example 60 If compound samples that were actually composed of five individual tablets had been analyzed instead of the spiked matrix, the CV would be expected to be larger than 0.5% on account of the additional manufacturing error, but by a factor Vs = 2.2 lower than the content uniformity CV. (Cf. Eq. (1.5).) Since the average CV for CU was found to be -1.76% ( 1.97, 1.28, resp. 1.95%), this would have to be in the region of about 1.76/2.2 = 0.8, which is still well within the range of accepted instrumental noise. 

Assay 90-110% of label claim (pick 20 tablets at random grind and mix weigh an amount of powder corresponding to five tablets dissolve compound sample and centrifuge excipients run a HPLC analysis on an aliquot of the supernatant), and... 

In contrast to other organothallium(I) compounds, cyclopentadienyl-thallium(I) is a remarkably stable compound. Samples can be stored in sealed bottles for months without appreciable decomposition occurring it is unaffected by water and dilute alkali and it is only slowly oxidized by air at room temperature. Cyclopentadienyltballium(I) was first prepared by Meister in 1956 by addition of freshly distilled cyclopentadiene to a suspension of thallium(I) sulfate in dilute potassium hydroxide solution 101, 102). A number of variations of this procedure have been described (5, 25, 34, 56), and the compound has been made in other ways 35, 56,110, 164), but Meister s preparation, in which the yield of crude product is greater than 90%, remains the method of choice. Purification of crude cyclopenta-dienylthallium(I) is best accomplished by vacuum sublimation, and purity of samples can readily be assessed by gas-liquid chromatography on silicone oil at 170° C using hydrogen as carrier gas (7). 

Compounds Sample Plate Eluent Alkaloids Detection Remarks Reference... 

To determine whether his Pacific samples were in fact representative of other oceans, Patterson and a Japanese colleague, Mitsunobu Tat-sumoto, began developing profiles of the lead in ocean layers in Atlantic and Mediterranean waters. Patterson hated ocean-going field trips he often became violently seasick, once so seriously that he had to be given oxygen. Because the ships were coated with leaded paints and compounds, sampling was tricky, too. Despite the problems, Patterson could see that, as in the Pacific, lead was concentrated in the upper portions of the Atlantic and Mediterranean. 

Fig. 2. Relaxation modulus G(t) of a set of polydimethylsiloxane samples with increasing extent of crosslinking plotted against time of crosslinking. The linear PDMS chains (Mn 10 000, polydis-persity index 2) were endlinked with a four-functional silane crosslinker catalyzed by a platinum compound. Samples with different extent of reaction were prepared by poisoning the reaction at different times. The actual extent of reaction was not determined. Two of the samples are clearly before the gel point (LST) and two beyond. The third sample is very close to the gel point. Data of Chambon and Winter [5] evaluated by Baumgartel and Winter [8]...

Outstandingly explosive among fluorodinitromethyl compounds, samples stored neat at ambient temperatures regularly exploded within a few horns. Occasionally, concentrated solutions in dichloromethane have decomposed violently after long storage. 

Sample Compound Sample preparation Analytical method LOD (ng L- orngg-1) Ref. 

The search is then performed using components extracted from the user s structural database. Again, granting the user the ability to govern the source of the components is key. Perhaps a database of known inhibitors can be utilized - further enriching the source components for potential solutions. After several minutes, potential derivatives are generated. These initial structures can be analyzed and evaluated for undesired chemical assemblies. The chemical descriptors can then be modified to eliminate such structures and enrich for preferred compounds. Sample hits are shown in Figure 8.18. 

The aim of the present study was to find whether differences could be detected in the compositions of mixture of volatile compounds sampled from the root zone of two different cultivars of barley. To have a reasonable base for a relevant genetic variation in the plant material, two cultivars with different adaptation to acid soils were selected. The sampling was done from young plants, as the establishment of the rhizosphere microflora is of importance in early stages of plant development. 

Compound Sample Concentration (micromolar) Time for Complete Combustion of 5-50 Nanomoles (min) Molar Heat of Aerobic Metabolism, Kcal... 

Magnetic susceptibility measurements are basic to the study of the magnetic properties of a compound samples under powder form are sufficient to start with and, what is very important in the case of actinides, small amounts of material are satisfactory (typically 100 mg). When working with transuranium compounds, safety requirements are fulfilled by working with sealed containers ... 

TGA. Unlike the previous two sets of molding compounds, the semiconductor grade novolacs investigated in this section do not differ solely in the presence or absence of a flame retardant. However, they are considered to be relatively equivalent. Weight loss measurements for the FR formulation, sample F, and the non-FR compound, sample G, are presented in Figure 7 for both nitrogen and air. Several differences are observed in the weight loss curves for these samples. 

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