PURPOSE To investigate the interpolymer complexation between Carbopol 934P (CP) and various grades of polyvinylpyrrolidone (PVP) (K90, K32, C15, and VA/S-630). METHODS Amount of fresh and dried CP-PVP complexes, water retaining capacity, apparent density, pH, conductivity, FTIR, swelling and adhesion strength were studied. RESULTS Interpolymer complexation occurred between CP and all the PV...

It is recognized that chlorin e6-polyvinylpyrrolidone (Ce6-PVP) formulations are characterized by a high efficacy in photodynamic therapy of malignant tumors. Currently, a commercially available formulation of this type is Photolon (Fotolon) with Ce6:PVP=1:1 (w/w) and the weight-average molecular weight of PVP is 1.2x10(4). To gain a better understanding of the role played by PVP in Ce6-PVP for...

The irreversible adsorption of polyvinylpyrrolidone (PVP) on a series of well-defined platinum single crystal electrode surfaces has been investigated using voltammetry, ex situ XPS and DFT calculations. It is found that the adsorption of PVP is highly structure sensitive with strong adsorption exhibited by step and {100} terrace sites with only weak interactions observed between PVP and Pt{111...

The vibrational spectra of platinum nanoparticles (2.4-9 nm) capped with poly(N-vinylpyrrolidone) (PVP) were investigated by deep UV-Raman and FTIR spectroscopy and compared with those of pure PVP. Raman spectra of PVP/Pt show selective enhancement of C=O, C-N, and CH2 vibrational modes attributed to the pyrrolidone ring. Selective enhancement of ring vibrations is attributed both to the resona...

T cells from CAF1 mice immunized with various amounts of the type 2 antigen polyvinylpyrrolidone (PVP) were assessed for their ability to provide help to PVP-specific memory B cells for the production of IgG. Low doses (0.0025 micrograms) of PVP consistently activated helper T cells (Th), which were required for the production of IgG by primed B cells. In contrast, T cells from mice primed with...

The effect of solvent power and flow rate on the permeability of a size exclusion chromatography (SEC) column packed with a novel polyvinylpyrrolidone (PVP)-grafted porous silica resin was studied. The PVP-silica resin was prepared from a porous silica size exclusion resin onto which a terminally anchored PVP layer was graft polymerized. The terminally anchored PVP layer was synthesized via a f...

OBJECTIVE Percutaneous vertebroplasty (PVP) is an effective treatment modality for management of osteoporotic compression fracture. However physicians sometimes have problems of high pressure in cement delivery and cement leakage when using Jamshidi® needle (JN). Bone void filler (BVF) has larger lumen which may possibly diminish these problems. This study aims to compare the radiologic and cli...

In this paper, capacitive-type humidity sensors were prepared by sequentially drop-coating the aqueous suspensions of zinc oxide (ZnO) nanopowders and polyvinyl pyrrolidone-reduced graphene oxide (PVP-RGO) nanocomposites onto interdigitated electrodes. Significant improvements in both sensitivity and linearity were achieved for the ZnO/PVP-RGO sensors compared with the PVP-RGO/ZnO, PVP-RGO, and...

Alone and combined effects of cyclodextrins (βCD and HPβCD), surfactant (Tween-80) and PVP on the solubility and dissolution rate of etoricoxib were evaluated in a series of 2 factorial design. The complexes of etoricoxib – CDs (βCD and HPβCD) were prepared with and without Tween-80 and PVP by kneading method as per 2 factorial designs. The solubility of etoricoxib in eight selected fluids cont...

BACKGROUND Percutaneous vertebroplasty (PVP) and percutaneous kyphoplasty (PKP) are effective procedures for the treatment of vertebral compression fractures (VCFs). However, recent studies have reported that secondary VCFs develop in patients after PVP or PKP treatment. This study aimed to investigate the clinical characteristics and management of secondary fractures after PVP or PKP. MATERI...