scholarly journals Voltammetric Sensor Based on Electrodes Modified by Poly(vinyl alcohol)-Natural Clay Film,for the Detection of Gallic Acid

2019 ◽  
Vol 37 (5) ◽  
pp. 327-333
Author(s):  
H G Valery ◽  
A Chtaini ◽  
B Loura
Keyword(s):  
Gallic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Voltammetric Sensor ◽  
Natural Clay

scholarly journals Gallic Acid and Quercetin as Intelligent and Active Ingredients in Poly(vinyl alcohol) Films for Food Packaging

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1999 ◽  
Author(s):  
Francesca Luzi ◽  
Elisa Pannucci ◽  
Luca Santi ◽  
José Maria Kenny ◽  
Luigi Torre ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Vinyl Alcohol ◽  
Food Packaging ◽  
Radical Scavenging Activity ◽  
Antioxidant Properties ◽  
Radical Scavenging ◽  
Casting Process ◽  
Poly Vinyl Alcohol ◽  
Hydroxyl Groups ◽  
Active Ingredients

Gallic acid (GA) and quercetin (QC) were used as active ingredients in poly(vinyl alcohol) (PVA) film formulations obtained by solvent casting process. The effect of two different percentages (5 and 10 % wt.) on morphological behavior, thermal stability, optical, mechanical, and release properties of PVA were investigated, while migration with food stimulants and antioxidant properties were tested taking into account the final application as food packaging systems. The results showed how different dispersability in PVA water solutions gave different results in term of deformability (mean value of ε PVA/5GA = 280% and ε PVA/5QC = 255%, with 190% for neat PVA), comparable values for antioxidant activity at the high contents (Radical Scavenging Activity, RSA(%) PVA/10GA = 95 and RSA(%) PVA/10QC = 91) and different coloring attitude of the polymeric films. It was proved that GA, even if it represents the best antioxidant ingredient to be used with PVA and can be easily dispersed in water, it gives more rigid films in comparison to QC, that indeed was more efficient in tuning the deformability of the PVA films, due the presence of sole hydroxyl groups carrying agent. The deviation of the film coloring towards greenish tones for GA films and redness for QC films after 7 and within 21 days in the simulated conditions confirmed the possibility of using easy processable PVA films as active and intelligent films in food packaging.

scholarly journals Unraveling the gallol-driven assembly mechanism of thermoreversible supramolecular hydrogels inspired by ascidians

2020 ◽  
Vol 11 (45) ◽  
pp. 7185-7198
Author(s):  
Alexis Wolfel ◽  
Esteban M. Euti ◽  
Matías L. Picchio ◽  
Marcelo R. Romero ◽  
Victor M. Galván Josa ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Gallic Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Polyphenolic Compound ◽  
Assembly Mechanism ◽  
Thermosensitive Hydrogels

Gallic acid, a small polyphenolic compound with strong hydrogen-bonding ability, is studied as a dynamic crosslinker of poly(vinyl alcohol) for preparing thermosensitive hydrogels. Furthermore, insights about the involved mechanism are shown.

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