Chromatographic studies

Silyl Ethers. The preparation of per- O-trimethyl silyl ethers of sucrose is generally achieved by reaction with chi orotrimethyl sil ane and/or hexamethyldisila2ane in pyridine (25,26). However, this reaction is not selective and in general per-trimethyl silyl ethers are only used as derivatives for gas chromatographic studies. 

We think, therefore, that the conformation, chain and segment mobilities in the attached macromolecules can play a significant role in the shielding behavior of the polymeric stationary phase as well as in the processes of its formation of complexes with solutes. Obviously, the chromatographic studies relevant to composite supports suffer from a lack of information on the structure of the attached polymer. Nevertheless, we will attempt to point out some relevant data from independent studies on polymer adsorption and/or graft polymerization. 

Therefore, an assumed value for e0 of 0.40 for a perfectly packed adsorbent bed is commonly found in chromatographic studies.40 This value has also been applied throughout this study for all the materials used. 

Machado and coworkers53 studied the products produced in the radiolysis of DMSO and found the formation of a product which absorbs at 252-262 nm, absorption which is known to be that of dimethyl disulfide. Gas chromatographic studies show the formation... 

Some Paper Chromatographic Studies with Aspergillus niger 152 Transfructosylase, S. A. Barker, E. J. Bourne, M. Stacey, and R. B. Ward, Biochem./., 69 (1958) 60-62. 

Pokharkar DS, Dethe MD. 1981. Gas-liquid chromatographic studies on residues of endosulfan on chili fruits. J Environ Sci Health B16 439-451. 

In summary, these exploratory data suggest that the chromatographic method used could be a valuable tool for study of this polymerization reaction. Reasonable data were obtained for amount and composition of the copolymer. Formation of graft polymer and/or nitrile rich polymer was detected. More detailed chromatographic study of this batch polymerization could lead to a practical on-line monitoring method... 

L. Castellani, P. Ferrantelli, M. Sinibaldi, G. Vigliano, Identification of Proteinaceous Adhesives in the Wooden Backing of Piero della Francesca s Painting Pala of Saint Bernardino a Gas Chromatographic Study, Journal of Cultural Heritage, 2, 209 215 (2001). 

Mills et al. [20] carried out reversed-phase liquid chromatographic studies of dissolved organic matter and copper-organic complexes isolated from estuarine waters. 

MHbR has been purified from erythrocytes of many species including man (H21, K8, Kll, K12, K14) and from brewers yeast (A6). The 1000-fold purified preparation obtained by Kiese (K14) has been shown, by means of chromatographical studies, to contain FAD. Thus the enzyme has been identified as a flavoprotein. However, the same author could not find any further activating effect of FAD or FMN on active preparations, nor a reactivation of the enzyme previously inactivated by dialysis (K14). 

Total resolution of [269] into its two enantiomers was achieved by liquid-liquid chromatography through complexation to L-valine adsorbed initially on diatomaceous earth (Timko et al., 1978). On the basis of comparative chromatographic studies, the separation factors (a) and the EDC values were correlated (Cram et al., 1975) (Table 59). 

A. Zotou, I. Eleftheriadis. M. Heli and S. Pegiadou, Ion-pair high performance liquid chromatographic study of the hydrolysis behaviour of reactive fluorotriazine dyes. Dyes Pigm., 53 (2002) 267-275. 

Tracer chromatographic study of pore and pore mouth adsorption of linear and monobranched alkanes on ZSM-22 zeolite./. Phys. Chem. E, 107, 398-405. 

Marciniak, B. Chromatographic studies of purity and segregation behaviour of natural impurities present in coal tar acenaphthene and pyrene, / Crys. Growth, 241(l-2) 206-219, 2002. 

Renner, G. Gas chromatographic studies of chlorinated phenols, chlorinated anisoles, and chlorinated phenylacetates, Toxicol Environ. Chem., 27 217-224, 1990. 

Fig. 2. Components in the reaction between D-xylose (2%) and methanolic hydrogen chloride (0.5%) at 25 ° (Gas-liquid chromatographic studies). From Can. J. Chem. 40, 224 (1962) (by permission)...

Grob RL, Cao KB. 1990. High-performance liquid chromatographic study of the recovery of aromatic amine and nitro compounds from soil. J Environ Sci Health Part A Environ Sci Eng... 

Patil SA, Shinde VM. 1989. Gas chromatographic studies on the biodegradation of nitrobenzene and... 

A Fuertoes-Matei, J Li, KC Waldron. Micellar electrokinetic chromatographic study of interaction between enkephalin peptide analogs and charged micelles. J Chromatogr B 695 39-47, 1997. 

Q Yang, X-Y Liu, M Hara, P Lundahl, J Miyake. Quantitative affinity chromatographic studies of mitochondrial cytochrome c binding to bacterial photosynthetic reaction center, reconstituted in liposome membranes and immobilized by detergent dialysis and avidin-biotin binding. Anal Chem 280 94-102, 2000. 

Hage, D.S., Walters, R.R., and Hethcote, H.W., Split-peak affinity chromatographic studies of the immobilization-dependent adsorption kinetics of protein A, Anal. Chem., 58, 274-279, 1986. 

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