Polymers of N-Vinylpyrrolidone: Synthesis, Characterization and Uses

Abstract

ABSTRACT:Polyvinylpyrrolidone (PVP) having molecular weights (Mwl from 2500 to about

Preparation, properties, and antibacterial behavior of a novel cellulose derivative containing lactam groups

“…Solution state NMR spectroscopy was performed using either a Varian VNMR-700 spectrometer at 699.73 MHz ( 1 H) and 174.93 MHz ( 13 C), or a Bruker Advance 400 spectrometer at 400.13 MHz ( 1 H) and 100.60 MHz ( 13 C). For solid-state 13 C NMR spectroscopy, a Varian VNMRS spectrometer with a 9.4 T magnet was used at 100.56 MHz employing the cross-polarization method. Gel permeation chromatography was undertaken with DMF as solvent at 70 C. 100 lL of solution agitated overnight to ensure complete dissolution was injected at a flow rate of 1.00 mL min 21 by a Viscoteck SEC autochanger model.…”

“…prepared via radical polymerization of N-vinylpyrrolidone. 13 The key property of PVP is its solubility in both organic and aqueous solvents. Its solubility is due to the presence of the lactam amide group which provides both hydrophobic and polar characteristics.…”

“…The precipitate was collected by filtration and dried under vacuum at 50 C overnight to afford the modified HEC as a pale yellow powder in yields ranging from 50 to 70% based on the estimation of DS by 13 C NMR spectroscopy. Samples from each reaction were characterized by solid-state 13 C NMR spectroscopy using the cross-polarization method. Samples were also dissolved in DMSO-d 6 and were characterized using 1 H (700 MHz), 13 C (176 MHz), HMBC, and HSQC NMR experiments; see Table 1 for summaries of DS.…”

“…Samples from each reaction were characterized by solid-state 13 C NMR spectroscopy using the cross-polarization method. Samples were also dissolved in DMSO-d 6 and were characterized using 1 H (700 MHz), 13 C (176 MHz), HMBC, and HSQC NMR experiments; see Table 1 for summaries of DS.…”

Developing a rapid, efficient and low cost method for rapid DNA extraction from arthropods

“…Sodium Chloride (NaCl) has been used to remove polysaccharides (FANG et al, 1992), and polyvinyl pyrrolidone (PVP) to purge polyphenols from arthropods diet (MALIYAKAL, 1992). To improve DNA quality it was used cross-linked polyvinyl pyrrolidone (PVPP) to remove alkaloids, terpenoids, glycosides, phenols, phenazines polyketides and peptides, as well as protein and carbohydrate (HAAF et al, 1985). The main objective of this research was to develop a quick, cheap and less hazardous alternative to protocols available on literature and market.…”