Reaction of poly(vinyl alcohol) and dialdehydes during gel formation probed by 1H n.m.r.—a kinetic study

AbstractElectrostatic extrusion was applied to the encapsulation of 3-ethoxy-4-hydroxybenzaldehyde (ethyl vanillin) in calcium alginate and calcium alginate/poly(vinyl alcohol) beads. The calcium alginate/poly(vinyl alcohol) hydrogel spheres were formed after contact with the cross-linker solution of calcium chloride, followed by the freeze-thaw method for poly(vinyl alcohol) gel formation. The entrapment of aroma in beads was investigated by FTIR and thermal analysis (thermogravimetry/differential thermal gravimetry; TGA/DTG). The mass loss in the temperature range of 150–300°C is related to degradation of the matrix and the release of ethyl vanillin. According to the DTG curve, the release of ethyl vanillin occurs at about 260°C. TGA measurements of the stored samples confirmed that formulations were stable for a period of one month. FTIR analysis provides no evidence for chemical interactions between flavour and alginate that would alter the nature of the functional groups in the flavour compound.

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Study on ketalization reaction of poly(vinyl alcohol) by ketones. IX. Kinetic study on acetalization and ketalization reaction of 1,3-butanediol as a model compound for poly(vinyl alcohol)

Journal of Polymer Science Part A Polymer Chemistry ◽

10.1002/(sici)1099-0518(19970715)35:9<1719::aid-pola13>3.0.co;2-8 ◽

1997 ◽

Vol 35 (9) ◽

pp. 1719-1731 ◽

Cited By ~ 4

Author(s):

Naofumi Nakamura ◽

Kimihiro Suzuki

Keyword(s):

Kinetic Study ◽

Vinyl Alcohol ◽

Model Compound ◽

Poly Vinyl Alcohol

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Swelling Kinetic Study of Poly(Vinyl Alcohol)/Poly(γ-Glutamic Acid) Blend Hydrogel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1095.423 ◽

2015 ◽

Vol 1095 ◽

pp. 423-426

Author(s):

Mian Mian Zhang ◽

Yu Xi Chen ◽

Xia Ma

Keyword(s):

Glutamic Acid ◽

Kinetic Study ◽

Vinyl Alcohol ◽

Diffusion Mechanism ◽

Fickian Diffusion ◽

Poly Vinyl Alcohol ◽

Swelling Kinetics ◽

Swelling Mechanism ◽

Swelling Kinetic ◽

Sensitive Property

In this article, the swelling behavior and swelling kinetic of poly (vinyl alcohol)/poly (γ-glutamic acid) hydrogel were investigated. It was found that the PGA/PVA hydrogels revealed the pH-sensitive property and exhibited a faster swelling at pH7.4. The study of swelling kinetics revealed that the swelling mechanism followed the non-Fickian diffusion mechanism.

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A novel hemostat and antibacterial nanofibrous scaffold based on poly(vinyl alcohol)/poly(lactic acid)

Journal of Bioactive and Compatible Polymers ◽

10.1177/0883911520913900 ◽

2020 ◽

Vol 35 (3) ◽

pp. 189-202 ◽

Cited By ~ 1

Author(s):

Reyhaneh Fatahian ◽

Mohammad Mirjalili ◽

Ramin Khajavi ◽

Mohammad Karim Rahimi ◽

Navid Nasirizadeh

Keyword(s):

Lactic Acid ◽

Blood Coagulation ◽

Vinyl Alcohol ◽

Modern Society ◽

Fibroblast Cell ◽

Poly Lactic Acid ◽

Poly Vinyl Alcohol ◽

Gel Formation ◽

Nanofibrous Scaffolds ◽

Novel Scaffold

Today, an advanced wound dressing with the ability of blood clotting and antibacterial activity is the main subject of many studies to consider their necessity in modern society. In this study, it was aimed to present a novel scaffold with both abilities simultaneously. Poly(vinyl alcohol)/poly(lactic acid) nanofibrous scaffolds containing ceftriaxone antimicrobial agent (PVA-CTX/PLA) and tranexamic acid coagulant (PVA-CTX-TXA/PLA) were fabricated by electrospinning method. Morphology, antimicrobial activity, blood coagulation and bioavailability indexes, and swelling ability (gel formation) of produced samples were determined. Morphological results showed that the hybrid nanofibers were form successfully. The antibacterial efficiency of them against Gram-negative ( Escherichia coli) and Gram-positive ( Staphylococcus aureus) bacteria was more than 90% for PVA-CTX/PLA and it reached 100% for PVA-CTX-TXA/PLA. Both PVA-CTX-TXA/PLA and PVA-TXA/PLA scaffolds showed acceptable blood coagulation ability with an average absorption of 0.043 and 0.036 nm, respectively. PVA-CTX-TXA/PLA scaffolds had a gel formation ability of about 45 min. All scaffolds were successful in cell proliferation (L929 fibroblast cell) after 48 h.

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