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.

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.

Thermo- and water-induced shape memory poly(vinyl alcohol) supramolecular networks crosslinked by self-complementary quadruple hydrogen bonding

2016 ◽  
Vol 7 (43) ◽  
pp. 6637-6644 ◽  
Author(s):  
Hongmei Chen ◽  
Ying Li ◽  
Gong Tao ◽  
Lin Wang ◽  
Shaobing Zhou
Keyword(s):  
Hydrogen Bonding ◽  
Shape Memory ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Donor Acceptor ◽  
Quadruple Hydrogen Bonding ◽  
Supramolecular Networks ◽  
First Time

Poly(vinyl alcohol) (PVA) supramolecular networks cross-linked by ureido-pyrimidinone (UPy) dimers via strong quadruple hydrogen bonding in donor–donor–acceptor–acceptor (DDAA) arrays have been synthesized for the first time.

Cross polarization/magic angle spinning 13C n.m.r. study of solid structure and hydrogen bonding of poly(vinyl alcohol) films with different tacticities

Polymer ◽  
1992 ◽  
Vol 33 (11) ◽  
pp. 2299-2306 ◽  
Author(s):  
Fumitaka Horii ◽  
Shaohua Hu ◽  
Tsukasa Ito ◽  
Hisashi Odani ◽  
Ryozo Kitamaru ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Vinyl Alcohol ◽  
Magic Angle Spinning ◽  
Poly Vinyl Alcohol ◽  
Magic Angle ◽  
Cross Polarization ◽  
Solid Structure ◽  
Angle Spinning
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