PVP Polyvinylpyrrolidone

Polyvinylpyrrolidone (PVP) is water-soluble polymer, whieh is widely used in various industries and agrieulture beeause of high inelination to the eomplex formation and eapaeity to stabilization of different systems. 

Last years the polymeric surface - active substances began to use as modifiers of organic reagent properties. In our work the behavior of synthetic polymers (polysulphonilpiperidinilmethylenhydroxide (PSPMH), polyvinylpyrrolidone (PVP), polyamines - polyguanidine and metacide) and natural polymers (starch, gelatin) for various molecular masses are investigated. 

The purpose of this study is twofold to compare four linear aqueous SEC columns made by Tosoh and Showa Denko in terms of composition and performance and to evaluate the effect of commercial PEO standards on the accuracy and precision of the MW and MWD of polyvinylpyrrolidone (PVP) and NIST PEO standards. In terms of performance, emphasis will be placed on factors not commonly covered by column manufacturers. Successful SEC conditions for PVP in water, in water/methanol, and in dimethylformamide can be found in the literature (8,9,10). This study deals mainly with the effects of column, mobile phase, and PEO standards on the MW and MWD of PVP. 

C. Effect of PEO Calibration Standards and Columns on the Molecular Weight and Polydispersity of Polyvinylpyrrolidone (PVP)... 

In the polymerization of St initiated with type II MAI composed of polyvinylpyrrolidone (PVP), block efficiency was kept to 80% when feed concentration was above 3 mol/L, but it drastically decreased below 3 mol/ L (Fig. 2) [36,37]. AIBN, the typical low-molecular weight azo initiator, shows a drastic decrease in its initiation efficiency below a critical feed monomer concentration, i.e., 0.5 mol/L. In the case of MAI, it seems that a similar decrease in initiation efficiency occurs at much higher critical monomer concentration due to immobility of macroinitiating radicals. 

Buffer and chemicals pH 7.8 phosphate buffer (16.29g Na2HP04-2H20, 1.17g NaH2P04H20, 1000 ml distilled water), Ethylene Diamine Tetra Acetic Acid (EDTA), Methionine (Met), Polyvinylpyrrolidone (PVP), Triton X-100, Phenylmethylsulphonylfluoride (PMSF), Riboflavin, Nitro Blue Tetrazolium (NBT). 

Chemicals Ascorbate, Potassium Phosphate, Ethylene DiamineTetraacetic Acid (EDTA), Sodium Ascorbate, H202 Polyvinylpyrrolidone (PVP). 

The uptake of radiocerium by intestinal lining cells is not unique but may be expected to occur in similar chemical compounds that form colloids or large complexes within the intestine (Sullivan, 1966). Macromolecules are known to be easily absorbed by the intestinal cells of newborn animals through the process of pinocytosis (Clark, 1959). Polyvinylpyrrolidone (PVP) has been shown to be taken into the intestinal cells of rats less than 18 days old (Clarke and Hardy, 1969). 

Burke and Lindow [1.13] showed, that certain bacteria (e. g. Pseudomonas syringae) can act as nuclei for crystallization if their surface qualities and their geometric dimensions are close to those of ice. Rassmussen and Luyet [1.14] developed a connection for solutions of water with ethyleneglycol (EG), glycerol (GL) and polyvinylpyrrolidone (PVP) between the subcooling down to the heterogeneous and homogeneous nucleation of ice. 

Ffirai and Toshima have published several reports on the synthesis of transition-metal nanoparticles by alcoholic reduction of metal salts in the presence of a polymer such as polyvinylalcohol (PVA) or polyvinylpyrrolidone (PVP). This simple and reproducible process can be applied for the preparation of monometallic [32, 33] or bimetallic [34—39] nanoparticles. In this series of articles, the nanoparticles are characterized by different techniques such as transmission electronic microscopy (TEM), UV-visible spectroscopy, electron diffraction (EDX), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) or extended X-ray absorption fine structure (EXAFS, bimetallic systems). The great majority of the particles have a uniform size between 1 and 3 nm. These nanomaterials are efficient catalysts for olefin or diene hydrogenation under mild conditions (30°C, Ph2 = 1 bar)- In the case of bimetallic catalysts, the catalytic activity was seen to depend on their metal composition, and this may also have an influence on the selectivity of the partial hydrogenation of dienes. 

Bell et al. (2002) investigated the relationship between water mobility as measured by oxygen-17 NMR (transverse relaxation rate obtained from linewidth at half-height) and chemical stability in glassy and rubbery polyvinylpyrrolidone (PVP) systems. Reported results suggest that water mobility in PVP model systems was not related to Tg. The study did not find a link between water mobility and reaction kinetics data (half-lives) for degradation of aspartame, loss of thiamin and glycine, and stability of invertase. 

Anion-based organic dye nanoparticles can be also synthesized on the basis of the ion-association method. In this case, hydrophobic phosphazenium cations such as tetrakis[tris(dimethylamino) phosphoranylideneamino]phosphonium cation are effective for ion-pair formation with anionic dyes. A neutral polymer stabilizer polyvinylpyrrolidone (PVP) that is soluble in water is sometimes added for preventing agglomeration... 

The DASPE nanoparticles have been synthesized by the ion association reaction between the dye cation (note that the native compound is an iodide salt DASPE-I) and the hydrophobic borate anion (TPB or TFPB-) in the presence of neutral polymer stabilizer polyvinylpyrrolidone (PVP) in aqueous solution [38, 39]. In the absence of PVP, mixing of aqueous TPB- (or TFPB-) and DASPE+ solutions at the same molar fraction yielded the orange opaque solid dispersion composed of the anion-exchanged dye species, DASPE-TPB (or... 

Nowadays, the sieving matrices most employed in CSE are polymer solutions that under suitable conditions may form a transient mesh or sieving matrix that provide the size-based separation of charged biopolymers. The polymer solutions can be formulated with linear acrylamide and N-substituted acrylamide polymers, cellulose derivatives, polyethylene oxide, and its copolymers or with a variety of polymers, such as polyvinylpyrrolidone (PVP), polyethylene oxide (PEO), and hydroxypropyl cellulose(HPC), which do not necessitate the preventive coating of the capillary wall due to their ability to dynamically coat the inner surface of the capillary, resulting in suppressed EOE and sample interactions with the capillary wall. 

V. Polyvinylpyrrolidone (PVP 3.5% solution in buffered normal saline OSMOPLASMA)... 

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