Designing antimicrobial polypropylene films with grape pomace extract for food packaging

Encapsulation of Grape (Vitis vinifera L.) Pomace Polyphenols in Soybean Extract-Based Hydrogel Beads as Carriers of Polyphenols and pH-Monitoring Devices

“…The absorption band at 3320 cm −1 is related to the stretching of -OH groups in phenolic compounds and water, while the band at 1265 cm −1 concerns the C-O groups in the pyran rings from flavonoids [ 36 ]. Other signals include those at 1617 cm −1 (C=O), 1041 cm −1 (C-O) [ 37 ], 675 cm −1 (C-H aromatic) and 1260 and 1076 cm −1 , related to the skeletal stretching vibration of aromatic rings and the C-O-C group in flavonoids [ 38 ]. The soybean extract-based bead shows a peak located at about 3443 cm −1 (elongation of the OH groups of polymeric compounds such as alcohols and carboxylic acids), 2921 cm −1 (CH symmetric and asymmetric vibration and aliphatic acid elongation) and 1720 cm −1 (asymmetric stretching vibration of C=O).…”

High‐quality modification of general polypropylene by the synergistic effect of zinc adipate, hydrotalcite, and polypropylene (SP179)

“…PP raw material is a nontoxic and odorless white powder. [1][2][3] PP is widely used in automobiles, medicine, packaging, tableware, construction materials, films, and other fields because of its excellent heat resistance (110-150 C, the heat deflection temperature), 4 chemical corrosion resistance, 5 creep resistance (21.8 kcal/mol, creep rupture), 6 electrical insulation (10 14 Ω m at 90 C, resistivity), 7 stress cracking resistance, 8 low density (0.9 g cm À3 ), 9 high toughness, 10 and high impact strength 1 and so forth, with continuously expanding applications. At the same time, PP also has become one of the most popular and promising class among the five general synthetic resins: polyethylene, polyvinyl chloride, polystyrene, PP, and ABS resin.…”

Coating of Polypropylene Non‐Woven Fabric with Layered Double Hydroxides Bearing Antioxidant and Antibacterial Natural Compounds

“…The melt blending of polyphenols with the polymer matrix may also encounter several drawbacks, such as the thermal instability of polyphenols at the polymer processing temperatures (generally above 180 °C), [ 17 ] the possible change in the optical, thermal, and mechanical properties of the polymer matrix, and the poor affinity of polyphenols with apolar polymer matrices such as PP, which may generate non‐homogeneous distribution and leaching effects. [ 14 ]…”

“…[12,13] PP has been extruded with grape extract displaying both antioxidant characteristics and antimicrobial activity against Gram-negative (Escherichia coli) and Gram-positive (Bacillus subtilis) bacteria. [14,15] In addition, our research group has recently deposited clove, olive leaf, and green tea extracts onto PP NWF, demonstrating a reduction of the viral load exceeding 90% against Human Adenovirus type 5 (HAdV5) and ranging from 30% to 90% against Human Coronavirus 229E (HCoV229E). [16] There are several strategies to integrate active compounds within a polymeric material, including films, electrospun fibers, and self-assembled coatings.…”

“…The melt blending of polyphenols with the polymer matrix may also encounter several drawbacks, such as the thermal instability of polyphenols at the polymer processing temperatures (generally above 180 °C), [17] the possible change in the optical, thermal, and mechanical properties of the polymer matrix, and the poor affinity of polyphenols with apolar polymer matrices such as PP, which may generate non-homogeneous distribution and leaching effects. [14] Depositing active substances on a surface can overcome some of the limitations associated with blended bulk materials while preserving the properties of the polymer matrix and the active components. However, in the case of inert polymers like polyolefins, it is fundamental to activate the surface's material to increase the polymer hydrophilicity and wettability.…”