Some effects of polyvinyl alcohol and polyvinyl pyrrolidone on the activity of lactate dehydrogenase and its isoenzymes

Histochemie ◽  
1971 ◽  
Vol 25 (2) ◽  
pp. 182-190 ◽  
Author(s):  
Hans A. Dahl ◽  
Sigurd Hj. From
Keyword(s):  
Lactate Dehydrogenase ◽  
Polyvinyl Alcohol ◽  
Polyvinyl Pyrrolidone

scholarly journals Spectroscopic Studies on Films of Lead Nitrate Doped Polyvinyl Alcohol – Polyvinyl Pyrrolidone Blend

2018 ◽  
Vol 15 (1) ◽  
pp. 55-67 ◽  
Author(s):  
Preeti B. Hammannavar ◽  
Blaise Lobo
Keyword(s):  
Polyvinyl Alcohol ◽  
Fluorescence Intensity ◽  
Lead Nitrate ◽  
Photo Luminescence ◽  
Spectroscopic Studies ◽  
Polyvinyl Pyrrolidone ◽  
Luminescence Spectroscopy ◽  
Allowed Transition ◽  
Indirect Allowed Transition ◽  
Uv Visible

Films of polyvinyl alcohol (PVA) – polyvinyl pyrrolidone (PVP) blend doped with lead nitrate (Pb(NO3)2) were prepared by solution casting method, with doping level (DL) of Pb(NO3)2 in PVA – PVP polymeric blend varying from 2.7 up to 50.5 wt%. The prepared films were characterized using UV-Visible spectroscopy, fluorescence (or photo- luminescence) spectroscopy, FTIR and Raman spectroscopy. Parameters like optical band gaps due to indirect allowed transition (IAT) and direct allowed transition (DAT), as well as the activation energy (Ea) for optical transitions are extracted from the UV- Visible (or optical) spectra of these films. Objective of the FTIR, Raman and Fluorescence spectroscopic study is to understand the molecular chemical changes in PVA and PVP caused by the dopant (Pb(NO3)2). There is an enhancement of fluorescence intensity at DLs of 2.7 wt%, and at DL 7.6 wt%, the fluorescence intensity decreases (quenching). PVP acts as a capping agent for the dopant species, and is considered to be responsible for changes in fluorescence intensity. Signature of nitrate ion (NO3-) vibration is observed at wavenumber 1037 cm-1 in Raman spectra, and in the FTIR spectra, the NO3- vibration is seen at the wavenumber equal to 1380 cm-1.

scholarly journals Radiation Modified CS/PVA Film with PVP Coating as Cu Adsorbent Material

2021 ◽  
Vol 29 (2) ◽  
Author(s):  
Norhashidah , Talip ◽  
Amalina Muhammad Afifi ◽  
Mohd Yusof Hamzah ◽  
Maznah Mahmud ◽  
Sarada Idris
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Mechanical Strength ◽  
Removal Efficiency ◽  
Polyvinyl Pyrrolidone ◽  
Γ Irradiation ◽  
Γ Radiation ◽  
Elongation At Break

Chitosan/Polyvinyl alcohol (CS/PVA) films were coated with layer of polyvinyl pyrrolidone (PVP) to improve its mechanical strength. In this study, chitosan/PVA mixture was first cast into film. The films were later dipped into different concentrations of PVP solutions at 1%, 3%, and 5%. They were then exposed to gamma (γ) radiation at 5,10,20 and 30 kGy. The tensile strength of chitosan/PVA films coated with 1% PVP was found to increase up to 31%. Elongation at break was improved by 1% PVP coating. The CS/PVA Removal Efficiency (RE) with or without PVP coatings were not affected by γ irradiation. Result shows that the best settings to enhance the tensile strength of CS/PVA films for Cu adsorption application was 1% PVP coating at 5 kGy γ radiation.

Magnesium ion conducting polyvinyl alcohol–polyvinyl pyrrolidone-based blend polymer electrolyte

Ionics ◽  
2017 ◽  
Vol 23 (7) ◽  
pp. 1771-1781 ◽  
Author(s):  
Mangalam Ramaswamy ◽  
Thamilselvan Malayandi ◽  
Selvasekarapandian Subramanian ◽  
Jayakumar Srinivasalu ◽  
Manjuladevi Rangaswamy
Keyword(s):  
Polyvinyl Alcohol ◽  
Polymer Electrolyte ◽  
Polyvinyl Pyrrolidone ◽  
Magnesium Ion ◽  
Ion Conducting ◽  
Blend Polymer Electrolyte ◽  
Blend Polymer

Irradiation of polyvinyl alcohol and polyvinyl pyrrolidone blended hydrogel for wound dressing

2001 ◽  
Vol 62 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Mirzan T Razzak ◽  
Darmawan Darwis ◽  
Zainuddin ◽  
Sukirno
Keyword(s):  
Polyvinyl Alcohol ◽  
Wound Dressing ◽  
Polyvinyl Pyrrolidone
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