Chromatographic resin

The roots of the misidentified plant material Ipomoea murucoides were dried, pulverized, and macerated in chloroform. In reality, the analyzed plant material was /. arborescens as revealed by its chemistry which proved to be totally different from that identified for 7. murucoides (63), when the latter was fractionated by column chromatography. The basic hydrolysis of the resinous chromatographic fractions of this sample produced the same glycosidic acid derivative ultimately found in I. arborescens, i.e., murucinic acid (hexadecanoic acid, (115)-[((9-)S-d-... 

Ambersorb Resins. Chromatographable residues attributable to each of the Ambersorb resins, XE-340 and XE-348, as shown in Figure 1, are significantly lower than the values reported for each of the Amberlite resins. As shown in Figure 3, the majority of the components isolated from the Ambersorb XE-340 resin are readily classified as polycyclic aromatic hydrocarbons. (These are believed to be associated... 

Approximately 2—3 leads Resynthesized on resin Chromatographic format Actual feed stream Optimized elution conditions Optimized peptide density... 

Mostafazadeh AK, Sarshar M,Jawidian S, Zarefard MR, Haghighi ZA. Separation of fructose and glucose from date syrup using resin chromatographic method experimental data and mathematical modeling. Sep PurifTechnol 2011 79(1) 72—8. 

Highly branched or cross-linked polymer materials can be obtained through copolymerization of vinyl/divinyl monomers. Such products have applications as ion-exchange resins, chromatographic packings, superabsorbent materials, contact lenses, photoresists, and dmg deliveries. Widely used divinyl monomers are divinylbenzene and ethylene glycol dimethaaylate. 

Without going into details of the chromatographic method, a SAR separation (asphaltenes having been eliminated) can be performed in a mixed column of silica followed by alumina. The saturated hydrocarbons are eluted by heptane, the aromatics by a 2 1 volume mixture of heptane and toluene, and the resins by a 1 1 1 mixture of dichloromethane, toluene and methanol. 

Ligand exchange Equihbrium Chromatographic separation of glucose-fructose mixtures with Ca-form resins Removal of hea y metals with chelating resins Affinity chromatography... 

The advantages of monosized chromatographic supports are as follows a uniform column packing, uniform flow velocity profile, low back pressure, high resolution, and high-speed separation compared with the materials of broad size distribution. Optical micrographs of 20-p,m monosized macroporous particles and a commercial chromatography resin of size 12-28 p,m are shown in Fig. 1.4. There is a clear difference in the size distribution between the monodispersed particles and the traditional column material (87). 

The distribution coefficient can be determined by batch experiments in which a small known quantity of resin is shaken with a solution containing a known concentration of the solute, followed by analysis of the two phases after equilibrium has been attained. The separation factor, a, is used as a measure of the chromatographic separation possible and is given by the equation,... 

It is appropriate to refer here to the development of non-suppressed ion chromatography. A simple chromatographic system for anions which uses a conductivity detector but requires no suppressor column has been described by Fritz and co-workers.28 The anions are separated on a column of macroporous anion exchange resin which has a very low capacity, so that only a very dilute solution (ca 10 4M) of an aromatic organic acid salt (e.g. sodium phthalate) is required as the eluant. The low conductance of the eluant eliminates the need for a suppressor column and the separated anions can be detected by electrical conductance. In general, however, non-suppressed ion chromatography is an order of magnitude less sensitive than the suppressed mode. 

Dichlorodibenzo- -dioxin. 2-Bromo-4-chlorophenol (31 grams, 0.15 mole) and solid potassium hydroxide (8.4 grams, 0.13 mole) were dissolved in methanol and evaporated to dryness under reduced pressure. The residue was mixed with 50 ml of bEEE, 0.5 ml of ethylene diacetate, and 200 mg of copper catalyst. The turbid mixture was stirred and heated at 200°C for 15 hours. Cooling produced a thick slurry which was transferred into the 500-ml reservoir of a liquid chromatographic column (1.5 X 25 cm) packed with acetate ion exchange resin (Bio-Rad, AG1-X2, 200-400 mesh). The product was eluted from the column with 3 liters of chloroform. After evaporation, the residue was heated at 170°C/2 mm for 14 hours in a 300-cc Nestor-Faust sublimer. The identity of the sublimed product (14 grams, 74% yield) was confirmed by mass spectrometry and x-ray diffraction. Product purity was estimated at 99- -% by GLC (electron capture detector). 

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