A novel poly (vinyl alcohol)-aided ZnO/Fe2O3 nanocomposite as an ascorbic acid sensor

2021 ◽  
Vol 32 (6) ◽  
pp. 7778-7790
Author(s):  
Buzuayehu Abebe ◽  
Enyew Amare Zereffa ◽  
H. C. Ananda Murthy ◽  
C. R. Ravikumar
Keyword(s):  
Ascorbic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Ascorbic Acid Sensor

Poly(Vinyl Alcohol) Enhances Acetylation of Ascorbic Acid in Superparamagnetic Graphene Oxide Nanoparticles Ultrasonically Complexed with Acetylsalicylic Acid

2020 ◽  
Vol 2 (8) ◽  
pp. 3663-3673
Author(s):  
Anastasia Tkach ◽  
Uladzimir Fiadosenka ◽  
Aliaksandr Burko ◽  
Hanna Bandarenka ◽  
Anna Matsukovich ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Acetylsalicylic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Oxide Nanoparticles

Preparation of an ascorbic acid/PVA–chitosan electrospun mat: a core/shell transdermal delivery system

RSC Advances ◽  
2015 ◽  
Vol 5 (62) ◽  
pp. 50462-50469 ◽  
Author(s):  
Roqiye Najafi-Taher ◽  
Mohammad Ali Derakhshan ◽  
Reza Faridi-Majidi ◽  
Amir Amani
Keyword(s):  
Ascorbic Acid ◽  
Delivery System ◽  
Transdermal Delivery ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Coaxial Electrospinning ◽  
Core Shell ◽  
System P ◽  
Transdermal Delivery System

Core/shell l-ascorbic acid/poly(vinyl alcohol)–chitosan (ASC/PVA–CS) nanofibers were successfully prepared utilizing coaxial electrospinning and their characteristics were compared with monolithic blend PVA–CS–ASC nanofibers.

scholarly journals Characterization and Evaluation of Ternary Complexes of Ascorbic Acid with γ-Cyclodextrin and Poly(vinyl Alcohol)

2020 ◽  
Vol 21 (12) ◽  
pp. 4399
Author(s):  
Phennapha Saokham ◽  
Kanokporn Burapapadh ◽  
Pitsiree Praphanwittaya ◽  
Thorsteinn Loftsson
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Vinyl Alcohol ◽  
Ternary Complex ◽  
Ternary Complexes ◽  
Hydroxyl Group ◽  
Poly Vinyl Alcohol ◽  
Hydrodynamic Diameter ◽  
High Concentration ◽  
Drug Stabilization

Ascorbic acid (AA) is a general antioxidant used in aqueous pharmaceutical formulations. However, in aqueous solutions, AA is unstable and easily oxidized when exposed to air, light and/or heat. Cyclodextrins are well known for their ability to form inclusion complexes with various compounds to improve their solubility and stability. Previous studies demonstrate that cyclodextrins preserve the antioxidant capacity of AA but data for γ-cyclodextrin (γCD) have not been reported. Poly(vinyl alcohol) (PVA) is a hydrophilic polymer widely used as a drug matrix in various pharmaceutical fields, but its application for drug stabilization is limited. This study aimed to investigate the protective ability of γCD on AA through the formation of ternary complexes with PVA. Binary (i.e., AA/γCD, AA/PVA and γCD/PVA) and ternary (i.e., AA/γCD/PVA) complexes were first confirmed. It was reported that those complexes were formed through interactions between the heterocyclic ring of AA, hydroxyl group of PVA and hydrophobic cavity of γCD. The hydrodynamic diameter of complexes was then studied. It was found that the diameter of γCD/PVA complexes increased with respect to the concentration of γCD. Higher γCD concentrations also resulted in increasing hydrodynamic diameters of the ternary complex. The presence of AA in ternary complexes interfered with the aggregation tendency of γCD/PVA binary complexes. Furthermore, the antioxidant capacity of AA in binary and ternary complexes was investigated. It was found that the presence of γCD preserved the antioxidant activity of AA, whereas PVA showed a contrasting effect. The influence of γCD and PVA concentration on antioxidant capacity was then studied through central composite design (CCD). Even though the concentration of γCD significantly affected the inhibition efficiency of the ternary complex, the insignificant influence of PVA could not be ignored. A promising protective ternary complex should consist of an optimized concentration of PVA and a high concentration of γCD.

scholarly journals Graphene Based Poly(Vinyl Alcohol) Nanocomposites Prepared by In Situ Green Reduction of Graphene Oxide by Ascorbic Acid: Influence of Graphene Content and Glycerol Plasticizer on Properties

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1013 ◽  
Author(s):  
Mónica Cobos ◽  
M. Fernández ◽  
M. Fernández
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Water Absorption ◽  
Vinyl Alcohol ◽  
Nanocomposite Films ◽  
Ex Situ ◽  
Poly Vinyl Alcohol ◽  
Vapor Permeability ◽  
Water Barrier

The enhanced properties of polymer nanocomposites as compared with pure polymers are only achieved in the presence of well-dispersed nanofillers and strong interfacial adhesion. In this study, we report the preparation of nanocomposite films based on poly(vinyl alcohol) (PVA) filled with well dispersed graphene sheets (GS) by in situ reduction of graphene oxide (GO) dispersed in PVA solution using ascorbic acid (L-AA) as environmentally friendly reductant. The combined effect of GS content and glycerol as plasticizer on the structure, thermal, mechanical, water absorption, and water barrier properties of PVA/GS nanocomposite films is studied for the first time. Higher glass transition temperature, lower crystallinity, melting, and crystallization temperature, higher mechanical properties, and remarkable improvement in the thermal stability compared to neat PVA are obtained as a result of strong interfacial interactions between GS and PVA by hydrogen bonding. PVA/GS composite film prepared by ex situ process is more brittle than its in situ prepared counterpart. The presence of GS improves the water barrier and water resistance properties of nanocomposite films by decreasing water vapor permeability and water absorption of PVA. This work demonstrates that the tailoring of PVA/GS nanocomposite properties is enabled by controlling GS and glycerol content. The new developed materials, particularly those containing plasticizer, could be potential carriers for transdermal drug delivery.

Structure of junction zones in poly (vinyl alcohol) gels by rheological and thermal studies

1996 ◽  
Vol 93 ◽  
pp. 880-886 ◽  
Author(s):  
K Nishinari ◽  
M Watase ◽  
F Tanaka
Keyword(s):  
Vinyl Alcohol ◽  
Thermal Studies ◽  
Poly Vinyl Alcohol
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