UV Light Barriers for Food Packaging Protection

Four natural bioactive compounds with UV-absorbing properties curcumin, quercetin, caffeic acid, and hymecromone were incorporated into pectin-based coatings deposited on oriented polypropylene (OPP) to develop packaging films UV-shielding capabilities. The effects of both (used individually or in combination) coating thickness (d = 0.12 1.2 um) the optical (UV-Vis transmittance haze) coated OPP samples investigated. Coating deposition enhanced UV-barrier relation type compound, following order: acid > curcumin quercetin. Regardless compound used, no significant changes observed clarity haze OPP. Additionally, a greater resulted lower UV-light PP films. Although combination did not exhibit synergistic effect, it demonstrated an additive benefit, effectively broadening wavelength range UV protection final materials. While this study highlights that performance gap remains compared commercially-available materials, underscores potential replacing synthetic additives through technologies rather than masterbatch incorporation.

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Film forming composition for pharmaceuticals and food products that whitens during film formation without using titanium dioxide. The composition contains a surfactant or a combination of a surfactant and a salt. These ingredients whiten the film during drying, providing a light-blocking effect comparable to titanium dioxide. The whitening level can be adjusted. The composition allows visible images through the film while blocking light. It replaces titanium dioxide for whitening without its carcinogenicity concerns.

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The escalating global threat of ultraviolet (UV) radiation is manifested through multifaceted damage pathways including cutaneous carcinogenesis, photodegradation organic substrates, marine ecosystem destabilization, and infrastructure weathering. These urgent challenges have catalyzed sustained interdisciplinary efforts toward advanced UV-shielding technologies spanning biomedical, environmental, industrial domains. Current material arsenals include melanin, lignin, tannin, polydopamine, zinc oxide titanium dioxide, etc. materials can be applied to diverse fields such as food packaging, sunscreen fabrics, creams, eyeglasses, films tailored processing techniques employing distinct photoprotective mechanisms. Notwithstanding significant progress, the development an integrated selection framework that reconciles efficiency, durability, environmental compatibility persists a critical knowledge gap. In this context, main mechanisms various types UV shielding their applications in different are described systematically. Subsequently, comparative analysis advantages shortcomings presented,... Read More

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In this study, hazelnut shell-based vegetable carbon black (HCB) was synthesized from renewable agricultural waste and incorporated into chitosan (CS) gelatin (GEL) matrices to fabricate active packaging films. The structure of HCB characterized, the structure, physicochemical properties, antibacterial activity, ultraviolet resistance, functional performance CS-GEL-HCB films with varying contents (0, 1, 5, 9 wt% based on GEL) were systematically investigated. FT-IR results revealed that intermolecular hydrogen bonds formed between CS GEL. showed tensile strength CS-GEL film (15.83 0.40~32.06 0.61 MPa), as well its water vapor oxygen barrier properties (0.55 0.03~0.15 0.02 g/dm2), UV-visible light significantly improved (p < 0.05) after addition HCB, while permeability, moisture content, solubility effectively reduced (24.84 0.45~20.10 0.45%). More importantly, exhibited enhanced which helped delay oxidation deterioration oil sample during accelerated test. These suggest could serve an effective food material improve stability soybean in industry, showing great potential maint... Read More

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ABSTRACT Exposure of foods to ultraviolet (UV) radiation during processing, storage, and retail display can result in quality deterioration, reduced shelf life nutritional value, potential food safety issues. The use UVblocking packaging is an effective strategy minimize these harmful effects. Carbon dots (CDs) are a class carbonbased nanomaterials that have emerged as promising candidates for enhancing the performance biopolymerbased films coatings. Their unique advantages excellent UV absorption ability combined with their low toxicity, biocompatibility, facile production from sustainable precursors make CDs superior alternatives traditional agents. Incorporating into biopolymers significantly enhance protection without compromising transparency packaging, thereby maintaining visual appeal packaged product. In addition protection, confer multifunctionality systems by imparting antioxidant, antimicrobial, pHresponsive properties, meeting demand intelligent solutions. These advancements not only protect photodegradation but also address broader issues through active respo... Read More

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Blow-molded containers for food packaging with selective barrier layers to improve shelf life. The containers have a two-part molding process. First, a top portion is injection molded from a single material. Then, a bottom portion with inner, outer, and intermediate sections is molded using a combination of the main material and a barrier material like an oxygen scavenger. The intermediate section with the barrier is positioned between the inner and outer sections. This allows a barrier layer to be concentrated and selectively positioned within the wall thickness. The bottom molding is done after the top to avoid trimming waste.

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Preserving plant parts like seeds, flowers, and leaves by placing them in containers with low oxygen environments to prevent discoloration and enhance germination. The low oxygen environments contain oxygen scavengers like enzymes or chemicals to remove oxygen that can cause pigment degradation. The containers may also have nitric oxide, stably maintained in deoxygenated water, to further promote germination. The oxygen scavengers can be in separate sachets or packets inside the containers. The containers can be made of polymer materials and the scavengers can be applied as films. This preserves plant parts like seeds without drying or freezing them.

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ABSTRACT Grape byproducts, including seeds, skins and stalks, have garnered attention for the development of active intelligent films due to their phenolicrich composition. These byproducts contain compounds such as carotenoids, flavonoids, phenolic acids, tannins proanthocyanidins, which exhibit antimicrobial activity against a broad spectrum both grampositive gramnegative microorganisms. They also possess antioxidant properties, UVblocking capabilities pHsensing characteristics that, when applied packaging, can extend shelf life food. Consequently, from grape is particular importance. This review aims summarize recent studies (20192024) on made focusing biological activities responses. The potential application anthocyanins in pHsensitive refrigerated packaging noteworthy, making them suitable use with meats seafood. seed extracts demonstrated dual antibacterial effects bacteria, exhibiting dosedependent behaviour alongside properties. Additionally, syrup, extract bacterial cellulose displayed minimal UV transmittance while maintaining partial transpar... Read More

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Oxygen removal module for fresh food storage in refrigerators that prevents food spoilage due to oxygen. The module has an electrolyte tank with an air pressure balance port connected to a water tank. The water tank supplements water to the electrolyte tank. This prevents water shortage in the electrolyte tank after long operation due to oxygen consumption. The water tank also has a feeding port with a plug. The electrolyte tank has an oxygen exhaust hole with a floating ball that blocks it when the tank tips over. A pressure release valve is at the top. This allows oxygen removal from the food storage space while preventing water loss issues.

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One of the main challenges facing fresh-cut produce industry is maintaining quality and food safety these products to ensure both consumer satisfaction, which includes not further compromising environment by following global trend toward positive environmental footprints spirit circular economy. Bio-based polymer blend films have emerged as a novel alternative replace traditional plastics due their biodegradability, sustainability, friendliness characteristics. In this work, we evaluated properties gelatin/chitosan composite coatings incorporated with thyme essential oil (TEO) in free form microencapsulated -cyclodextrin. The incorporation encapsulated TEO enhance blocking against UVvisible light (opacity values 5.25 7.54 for 4% content, respectively) provides excellent vitro antimicrobial antioxidant properties. Films showed improvement tensile strength water vapor permeability, respect both, neat TEO, while exhibited enhanced elongation at break. Encapsulation can slow down release rate from allowing bioactive remain active much longer time. After 12 days refrigerated storage ... Read More

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Fruit spoilage caused by oxidation and microbial infection exacerbates resource wastage. Although starch films including chitosan possessed admirable biocompatibility owing to great biodegradability compared with conventional plastics, deficient antibacterial antioxidant capacity restricted food shelf life. Herein, an environmentally friendly film (CS/G-CDs) was constructed carbon dots derived from Cirsii Herba (CDs), which formed through high affinity resulting hydrogen bonding between molecules hydroxyl originating CDs. The prepared CDs presented homogeneous monodisperse spherical structures ultrasmall size, providing favorable conditions for uniform formation. Encouragingly, the of CS/G-CDs increased 5.00-fold, followed rate up 97.0%. Dramatically, revealed glorious UV shielding efficacy (99.9% UVB 98.2% UVA), its preservation time blueberries remarkably extended 8 days longer than that film. Overall, Chinese herb-derived exhibited magnified antibacterial/antioxidant properties biocompatibility, provided a promising strategy sustainable development packaging materials.

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Plastic containers for food and beverages that have improved shelf life without compromising recyclability. The containers have selective placement of barrier materials like oxygen scavengers near the center to reduce the total amount needed. This allows using less of the expensive barrier materials while still providing the same or better shelf life. By concentrating the barrier materials in certain areas, less overall barrier material is needed compared to uniform distribution. This enables recycling the containers without yellowing issues that occur with high barrier concentrations. The containers are made by selectively injecting barrier materials into specific layers of the preform.

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Packaging film for protecting light-sensitive materials that blocks UV light while allowing visible light transmission. The film has multiple ultra-thin layers with an average thickness of less than 500 nm. The film has a sharp bandedge between UV and visible light ranges. The UV transmission is less than 15% while visible light transmission is greater than 70%. The bandedge slope is greater than 3%/nm. This provides effective UV blocking and visual inspection without color shifts.

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Food packaging film with a light-shielding structure to prevent food deterioration from light exposure during transportation and storage. The film has a base layer, a first light-shielding layer, a second light-shielding layer, bubble films connected to the light layers, and ventilation holes. The light layers block light from reaching the food, the bubble films provide cushioning, the ventilation holes allow airflow, and printing and antimicrobial layers can be added. This balances protection against light, cushioning, airflow, and functionality like printing and antimicrobials.

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A light-blocking packaging blank for food containers that replaces aluminum foil to reduce carbon emissions while maintaining oxygen barrier properties. The blank consists of a sequence of layers: a first PE layer, a base paper layer (optional), a high barrier film, a second PE layer, and a fourth PE layer. The high barrier film and second PE layer are bonded together using an adhesive layer. The base paper layer has indentations on both sides. The second PE layer contains color masterbatch. This structure provides light-blocking properties comparable to aluminum foil while using less material. The high barrier film and base paper indentations improve oxygen barrier properties.

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Protective starch-based film with long-term bacteriostasis and ultraviolet shielding properties for food packaging. The film is made by self-assembly of metallic polyphenol coated zinc oxide nanoparticles and self-polymerization of a melanin-like precursor with starch. The metallic polyphenol nanoparticles provide antibacterial activity, ultraviolet shielding, and mechanical strength. The melanin-like precursor crosslinks the starch and nanoparticles into a network. The film has high ultraviolet shielding, bacteriostasis, and transparency compared to conventional packaging materials.

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Composite polyvinyl alcohol preservative film with low luminous transmittance for light-proof packaging of fruits and vegetables to prevent spoilage and discoloration. The film contains modified silicon dioxide nanoparticles dispersed in a polyvinyl alcohol solution. The modified silicon dioxide nanoparticles have a particle size range of 200-1000 nm. This composite film provides better light-blocking properties compared to pure polyvinyl alcohol film due to the nanoparticles scattering light. The nanoparticles also improve film compactness. The modified silicon dioxide is made by reacting silicon dioxide with a silane compound in toluene, then acid treating. The composite film is prepared by dissolving polyvinyl alcohol in acid, adding the nanoparticles, antimicrobial, and stirring before defoaming

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Active and intelligent food packaging made by grafting curcumin onto polypropylene using reactive extrusion. The curcumin is covalently bound to the polymer backbone to prevent migration. The curcumin in the packaging material provides antioxidant and radical scavenging properties to prevent food spoilage. The packaging also changes color in the presence of ammonia, indicating spoilage. The curcumin-grafted polypropylene has improved UV barrier properties compared to native polypropylene. The reactive extrusion method allows scalable production of the active and intelligent packaging.

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Edible coatings for protecting foods like fruits, vegetables, and processed foods from moisture loss, UV damage, and nutrient leaching. The coatings are made from nanocellulose and nano calcium carbonate. The coatings are edible, transparent, and provide barrier properties against water, gases, and UV light. They prevent moisture loss, prevent UV damage, and prevent nutrient leaching in fruits and vegetables. The coatings can be applied before or after harvest to mitigate post-harvest damage. The coatings can also be used to protect frozen foods from drip loss during thawing.

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A photo-oxygen barrier for packaging materials that protects light and oxygen sensitive products like food, beverages, medications, and cosmetics. The barrier is a composite material containing 1-65% of a light-blocking composition, 1-30% of an active oxygen absorber, and 5-98% of a base material. The light-blocking composition can contain titanium dioxide, aluminum powder, and carbon black. The active oxygen absorber contains cobalt. The barrier can be made by melt extrusion or mixing the components in a base material.

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