Structural analysis, and antioxidant and antibacterial properties of chitosan-poly (vinyl alcohol) biodegradable films

Abstract

The development and characterization of biodegradable blend films based on chitosan and poly (vinyl alcohol) for possible use in a variety of biological activities are reported. Fourier transform infrared spectroscopy (FTIR) spectra of chitosan-poly (vinyl alcohol) (Ch/PVA) films showed characteristics peaks shifting to a lower frequency range due to hydrogen bonding between -OH of PVA and -NH2 of chitosan. The chitosan and PVA polymers presented good compatibility. The morphology study of chitosan and composite films showed a compact and homogenous structure. The tensile strength and elongation at break increased with PVA content. In fact, the highest tensile strength and elongation at break (53.58 MPa and 454 %) occurs with pure PVA film. The results showed that PVA incorporation in the blends contributes to increase the intermolecular interactions, thus improving the mechanical properties. In addition, the prepared films demonstrated high antioxidant activities monitored by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging, reducing power, and β-carotene bleaching activity. Nevertheless, PVA addition reduced antioxidant and antibacterial activities against Gram-positive and Gram-negative bacteria tested.

Antibacterial Films Based on PVA and PVA–Chitosan Modified with Poly(Hexamethylene Guanidine)

“…Currently, scientists' interest is increasingly focusing on using biodegradable polymers for this purpose [1,2,[4][5][6]. Poly(vinyl alcohol) (PVA) and chitosan (Ch) [7][8][9][10][11][12][13] are the best known environmentally friendly polymers. PVA is a polymer that displays very useful functional characteristics, i.e., a high mechanical strength, photostability, and high gas barrier properties (especially in relation to oxygen) [4,13].…”

“…For this reason, poly(vinyl alcohol) is obtained through a hydrolysis reaction of poly(vinyl acetate) [4]. One of the most significant features of PVA is its hydrophilicity, which is the result of the presence of numerous hydroxyl groups in the main chain of the macromolecule [12]. Moreover, it should be mentioned that poly(vinyl alcohol) is characterized by unique properties, such as excellent film forming properties, high crystallinity, nontoxicity, and a remarkable chemical resistance.…”

“…It is commonly acknowledged as a nontoxic, natural, biodegradable and biofunctional material; therefore, it is considered to be safe for human organisms. Moreover, some authors have claimed that chitosan has antifungal and antibacterial properties [12,13,[17][18][19]. The antibacterial properties of chitosan are related to its polycationic character [12,18,20].…”

Effect of bilayer coating composed of polyvinyl alcohol, chitosan, and sodium alginate on salted duck eggs

“…[3] Many degradable materials have been applied on shell eggs to preserve the internal qualities, including synthetic polymers such as polysaccharides and proteins. [3][4][5][6][7][8] However, little information is available about the preservation effect of degradable coatings on SDEs. Wang et al [9] reported that composite coating based on nano-SiO 2 -modified polyvinylidene chloride could significantly (p < 0.05) reduce quality deterioration of SDEs such as weight loss, total volatile basic nitrogen (TVB-N), and total bacterial counts.…”

“…It was reported that the composite films based on PVA and CHI had enhanced physical properties and high antioxidant activities. [7,8] Sodium alginate (SA) is a natural polysaccharide that can produce insoluble film by crosslinking of polyvalent metal cations. [10] Like CHI, SA has some special features, such as biocompatibility, chelating ability, and high hydrophilicity.…”