Extraction expression

Multiple extractions expression may be derived by considering a certain volume, VB, of the aqueous phase containing ma grams of solute and a certain volume, VQ, of the organic phase. With first extraction concluded, the weight of solute left in the aqueous phase is considered to be mv The equilibrium concentration in aqueous phase is then equal to m1/Va and the equilibrium concentration in organic phase is equal to (m - ma)/V0. The process so far permits the following expression ... 

Figure 3. ORAC antioxidant activity determination of Echium vulgare defatted seeds methanolic extract expressed as netarea under the curve (netAUC)...

At 18 h after dosing cattle with febantel, 90% of the residues in liver were readily extractable expressed as percentage of total residues, fenbendazole accounted for 30-41% in liver, oxfendazole 4-19%, oxfendazole sulfone 14-15%, and febantel 3-6%. Traces of the amine metabolite of fenbendazole, oxfendazole, and oxfendazole sulfone could be also detected. When residues in bovine liver were measured at 10 day withdrawal, a much lower proportion of... 

Fig. 9.6-11 demonstrates the stability of lard stabilized with C02-rosemary extracts, expressed as the Peroxide Number (POZ), compared to BHA (Butylhydroxyanisole), and pure lard, as a blank test value. 

Figure 8. Relative peak height percents for the major toxaphene GLC peaks in the residue jrom sample pairs. For example, the top graph (A) shows the heights (relative to Peak 6) of peaks from the 50-day leaf extract expressed as percents of corresponding peaks from the 0-day leaf extract (56).

The chromatograms of the E-III fraction which should contain the more polar acid metabolites, had too much interference from endogenous substances to allow cannabinoid detection. A comparison of the endogenous matrix levels of the hexane and ether extracts, expressed in terms of relative 215nm absorbance area in the cannabinoid elution region, is given in Table 3. 

EE is ether extract in % dry matter. The FA/EE coefficient is the percentage of fatty acids in the ether extract (expressed in %). 

The Stiasny number method was used to determine the polyphenol content of the extracts [24]. Fifty ml of 0.4% w/w tannin solution was pipetted into a 150 ml flask. Aqueous formaldehyde (37%, 5 ml) and hydrochloric acid solution (10 N, 5 ml) were then added and the mixture was heated under reflux for 30 min. The reaction mixture was filtered through a sintered glass filter (40-100 pm) while it was still hot. After that the precipitate was dried in an oven at 105°C to constant weight. The Stiasny number is the ratio of the oven dried weight of the precipitate to the total dissolved solids content of the tannin extract, expressed as a percentage. 

Cell extracts expressing recombinant retinoid receptors or cell or tissue extracts expressing endogenous levels of retinoid receptors (store as aliquots at -80°C). 

Indeed, GnT-II activity was greatly reduced in fibroblast extracts from CDGS type II patients [16]. Direct sequence of GnT-II coding region from CDGS type II patients identified point mutations on the catalytic domain of GnT-II [17]. These mutation were inherited consistently with CDGS type II phenotypes, cause cell extracts expressing these mutant GnT-II proteins, which have the same missense... 

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