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1.
Food Chem ; 351: 129347, 2021 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-33647702

RESUMO

In this study, two active packaging types were produced: single-layer biopolymer films with a polysaccharide - furcellaran and carp skin gelatin hydrolysate; two-layer films with identical composition, but synthetic peptide Alanina-Tyrosine addition. The procedure objective was multiplying antioxidant effects of the hydrolysate complexed with furcellaran. Films were used on Atlantic mackerel (storage 4 °C, 15 days); samples were analysed for changes in microbiological quality, TVB-N, biogenic amine content, fatty acid composition, TBARS. Consumer analysis was performed characterising mackerel carcass perception depending on implemented active coatings. The developed innovative single- and double-layer coatings effectively slow down lipid oxidation processes, especially at the initial period of Atlantic mackerel storage in refrigerated conditions. The coatings effectively inhibited microorganism growth, extending shelf-life by 2 days, single-layer coatings showing greater efficiency. According to consumers, coating application did not adversely affect product attractiveness parameters. The developed innovative coatings show great applicative potential as a new active packaging for perishable foods.


Assuntos
Alginatos/química , Antioxidantes/química , Carpas/anatomia & histologia , Embalagem de Alimentos/métodos , Gelatina/química , Peptídeos/química , Gomas Vegetais/química , Pele/química , Animais , Hidrólise , Oxirredução , Perciformes , Alimentos Marinhos/análise
2.
Molecules ; 26(5)2021 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-33652755

RESUMO

Food packaging is designed to protect foods, to provide required information about the food, and to make food handling convenient for distribution to consumers. Packaging has a crucial role in the process of food quality, safety, and shelf-life extension. Possible interactions between food and packaging are important in what is concerning food quality and safety. This review tries to offer a picture of the most important types of active packaging emphasizing the controlled/target release antimicrobial and/or antioxidant packaging including system design, different methods of polymer matrix modification, and processing. The testing methods for the appreciation of the performance of active food packaging, as well as mechanisms and kinetics implied in active compounds release, are summarized. During the last years, many fast advancements in packaging technology appeared, including intelligent or smart packaging (IOSP), (i.e., time-temperature indicators (TTIs), gas indicators, radiofrequency identification (RFID), and others). Legislation is also discussed.


Assuntos
Anti-Infecciosos/química , Antioxidantes/química , Preparações de Ação Retardada/química , Embalagem de Alimentos , Anti-Infecciosos/farmacologia , Antioxidantes/farmacologia , Preparações de Ação Retardada/farmacologia , Conservação de Alimentos , Qualidade dos Alimentos , Humanos
3.
Food Chem ; 352: 129333, 2021 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-33662916

RESUMO

Intelligent packaging with a pH indicator has been a hot research topic due to its extra active role compared with traditional ones. Considering the possible toxicity of synthetic pH sensitive pigments, natural pigments are promising alternative indicators. This work aimed to develop and characterize active and pH sensitive films based on psyllium seed gum (PSG) incorporated with free and microencapsulated mulberry pomace extracts (MPE). Compared with PSG control film, PSG-MPE films showed an increase in total phenolic content and DPPH scavenging activity, and decrease in surface hydrophobicity, lightness, and tensile strength. The molecular interactions between PSG and MPE were confirmed by thermal and microstructure analysis. Moreover, PSG-MPE films displayed wide color differences from red to blue at pH 2.0 - 12.0. PSG-based films containing 10% free and microencapsulated MPE demonstrated better overall performance and economy in packaging applications, which could be used as promising active and pH-sensitive food packaging materials.


Assuntos
Embalagem de Alimentos/métodos , Morus/química , Extratos Vegetais/química , Gomas Vegetais/química , Psyllium/química , Sementes/química , Cápsulas , Cor , Concentração de Íons de Hidrogênio , Interações Hidrofóbicas e Hidrofílicas , Resistência à Tração
4.
Molecules ; 26(4)2021 Feb 12.
Artigo em Inglês | MEDLINE | ID: mdl-33673385

RESUMO

Extracts rich in bioactive compounds added to edible films have allowed the development of active packaging that increases the shelf life of food. However, it is necessary to search for solvents that are nontoxic and not harmful to the environment, with natural deep eutectic solvents (NADES) being an attractive and easily synthesized alternative. This research aimed to design NADES by lyophilization to be used in the extraction of anthocyanins from the Chilean Luma chequen (Molina) A. Gray berry, and subsequently adding them to the matrix of edible ƙ-carrageenan films. For this purpose, ultrasound-assisted extraction (UAE) was used and the anthocyanin content was evaluated with the pH differential method. The antioxidant capacity of extracts was determined by DPPH assay and the antibacterial capacity by diffusion agar tests. The results obtained indicate that the designed NADES are efficient at extracting anthocyanins, reaching concentrations between 81.1 and 327.6 mg eq cyanidin 3-glucoside/100 g dw of L. chequen (Molina) A. Gray. The extracts reached inhibition diameters between 5 and 34 mm against Escherichia coli, Staphylococcus aureus, and Salmonella typhi strains. Once the extracts were incorporated into ƙ-carrageenan films, active edible films with antioxidant and antibacterial capacities were obtained.


Assuntos
Antocianinas/isolamento & purificação , Antioxidantes/química , Filmes Comestíveis , Embalagem de Alimentos , Antocianinas/química , Antioxidantes/isolamento & purificação , Antioxidantes/farmacologia , Carragenina/química , Carragenina/farmacologia , Frutas/química , Humanos , Extratos Vegetais/química , Extratos Vegetais/isolamento & purificação , Solventes/química , Ultrassom
5.
Carbohydr Polym ; 260: 117776, 2021 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-33712132

RESUMO

Pearl millet (Pennisetum glaucum (L.) R.Br.) is a sustainable and underutilized starch source, constituting up to 70 % starch in its grain. Pearl millet could be used as a cheaper source of starch as compared to other cereals for developing functional foods. This review is mainly focused on isolation methods, and chemical composition of the pearl millet starch (PMS). Techno-functional characteristics such as; gelatinization, pasting properties, solubility, swelling power, and digestibility to infer wider application of the PMS critically highlighted in the review. Native starches have limited functionalitiesfor food applications due to the instability in developed pastes and gels. A number of modifications (physical, mechanical and enzymatic) have been developed to increase the functionality and to obtain desired characteristics of PMS thus improving its utilization in food applications. Further, the utilization of native as well as modified PMS is also discussed comprehensively. In addition, a number of recommendations to further improve its functionality and increase its application are also discussed.


Assuntos
Pennisetum/metabolismo , Amido/química , Portadores de Fármacos/química , Embalagem de Alimentos , Géis/química , Peso Molecular , Nanopartículas/química , Solubilidade , Difração de Raios X
6.
Carbohydr Polym ; 260: 117778, 2021 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-33712134

RESUMO

To deal with serious environmental damage resulting from plastic packaging materials, biodegradable films using natural products have gained considerable attention. Here, we provide a simple, fast, and environmentally-friendly route to construct a biodegradable film using chitosan (CS), bacterial cellulose (BC), and curcumin (Cur). Composite films (CSn-BC-Cur) using CS with different molecular weights were investigated, and their water moisture content (MC), water solubility (WS), contact angle (CA), mechanical properties, barrier properties, and antioxidant properties were compared. The obtained films were characterized by SEM, XRD, and TGA. The results showed that chitosan with a higher molecular weight presented higher contact angles and mechanical properties, along with a lower moisture content, water vapor transmission rate, and oxygen transmission rate. Furthermore, when the composite film was placed in 95 % ethanol, it released active substances. The results suggest that these composite films can be used as promising materials for food packaging.


Assuntos
Celulose/química , Quitosana/química , Curcumina/química , Embalagem de Alimentos , Antioxidantes/química , Resistência ao Cisalhamento , Solubilidade , Temperatura , Água/química
7.
Food Chem ; 348: 129021, 2021 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-33545643

RESUMO

Lemon essential oils (LEO), as natural bacteriostatic agents, show significant loss in the preparation processes of food packaging materials, therefore, an effective encapsulation of LEO is urgent for realizing the protection. In this study, LEO was absorbed by thermally stable and porous vermiculite (VML) to form LEO/VML complex, which is further coupled with konjac glucomannan-grafted-poly (acrylic acid)/polyvinyl alcohol (KGM-g-PAA/PVA) composite. KGM-g-PAA/PVA bacteriostatic water-absorbing pad was prepared via electrospinning technique, which can minimize the loss of LEO. The VML (1 g) can significantly reduce LEO loss and achieve sustained control LEO release from the pad, which follows the predominant mechanism of Fick diffusion law. The sustained control LEO release from the pad can effectively inhibit the growth of E. coli during storage, thus prolonging shelf life of chilled pork for 3 day. This study suggests that KGM-g-PAA/PVA pad may have a great potential in the field of intelligent packaging.


Assuntos
Silicatos de Alumínio/química , Antibacterianos/química , Antibacterianos/farmacologia , Conservação de Alimentos/métodos , Mananas/química , Óleos Vegetais/química , Álcool de Polivinil/química , Animais , Preparações de Ação Retardada , Escherichia coli/efeitos dos fármacos , Embalagem de Alimentos , Armazenamento de Alimentos , Água/química
8.
Food Chem ; 345: 128625, 2021 May 30.
Artigo em Inglês | MEDLINE | ID: mdl-33601649

RESUMO

Small molecules in food contact materials may migrate into food during their contact. To extensively analyze the migrants, non-targeted screening is needed to detect the migrants. The migrants' detection is difficult because of the complexity and the trace amount of the migrants. In this work, the dissolution precipitation method was used to extract small molecules in Polyamide (PA) kitchenware. The extract solutions were screened by ultra-performance liquid chromatography-quadrupole time-of-flight-mass spectrometry (UPLC-QTOF-MS) for non-targeted analysis and 64 different small molecules in materials were identified through the screening of a self-built database. Then, migration tests were performed to analyze migrants in food simulants. It suggests that the abundance of PA oligomers was the highest in migrants. The risk assessment of migrants revealed that the exposure of most migrants was at a safer level unlike the exposure of PA oligomers that exceeded their threshold of toxicological concern (TTC).


Assuntos
Contaminação de Alimentos/análise , Nylons/análise , Cromatografia Líquida de Alta Pressão , Embalagem de Alimentos , Espectrometria de Massas/métodos , Medição de Risco
9.
Food Chem ; 350: 129250, 2021 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-33607412

RESUMO

Nowadays, polypropylene is one of the most common polymers used in the food packaging industry due to its good functionality and relatively low cost. Nevertheless, usage of plastic disposable packaging can be a generator of plastic pollution having negative environmental effects. A feasible solution for this issue would be to recycle. The polypropylene samples were submitted to two processes, forced contamination, and recycling, and they were analyzed by solid-phase microextraction gas chromatograph-olfactometry-mass spectrometry. 45 different volatile compounds were identified and 9 of them presented distinct odoriferous activities. Among them, two important markers were detected: diethyl phthalate (probably coming from the catalyst of PP polymerization, intentionally added substance (IAS)), and glycerine (a marker of non-intentionally added substances (NIAS)).


Assuntos
Embalagem de Alimentos/métodos , Odorantes/análise , Polipropilenos/química , Reciclagem , Compostos Orgânicos Voláteis/análise , Contaminação de Alimentos/análise
10.
Food Chem ; 349: 129140, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-33582545

RESUMO

In this work, cellulose acetate films were prepared with the incorporation of different carotenoids (lycopene, norbixin, and zeaxanthin). The effect of adding these natural antioxidants was evaluated through stability during storage under controlled conditions (temperature and light), degradation rate coefficient, release in food simulants and protective effect on oxidation of vitamin B2. During storage at 25 °C or 40 °C the light showed a greater effect on the stability of the carotenoids, with significant increase in reaction constants (k) and decrease in half-life (t1/2). The degradation of the carotenoids was followed by a variation in the color parameters and mechanical properties. The films with norbixin showed the highest barrier to the transmission of UV-Vis light, consequently preserving 72% of a vitamin B2 stored under a photooxidative environment. Lycopene presented a higher release rate than norbixin and zeaxanthin to a fatty food simulant.


Assuntos
Carotenoides/química , Celulose/análogos & derivados , Embalagem de Alimentos/métodos , Armazenamento de Alimentos/métodos , Celulose/química , Cor , Oxirredução
11.
Int J Food Microbiol ; 342: 109071, 2021 Mar 16.
Artigo em Inglês | MEDLINE | ID: mdl-33578302

RESUMO

Biodegradable films reinforced with bio-nanomaterials are a solution for developing active packaging systems, shelf-life extension and protection of environment against conventional packaging. This study aimed to characterize the biocompatible chitosan (CS) films formulated with nano-liposomal garlic essential oil (NLGEO) and assess the physicho-mechanical, morphology properties and also microbial and chemical changes in chicken fillets during storage time at 4 °C. NLGEO was obtained by thin-layer hydration-sonication method using glycerol and tween 80 as plasticizer and emulsifier, respectively. Different levels (0, 0.5, 1 and 2%) of NLGEO with average size of ~101 nm were added into the chitosan matrix and films fabricated by casting method. The average size, polydispersity index and zeta potential were ~101 nm, 0.127 and -7.23, respectively. Control samples showed higher values for pH, total volatile nitrogen (TVN), peroxide value (PV), thiobarbituric acid-reactive substances (TBARS), and microbial count including total viable count (TVC), coliforms, Staphylococcus aureus and psychrotroph bacteria than treated samples. The films with higher NLGEO content represented stronger inhibitory effects. The incorporation of NLGEO improved the mechanical properties and water resistance of active films. Microstructure analysis also showed a nearly smooth surface morphology and homogenous structure with a good dispersion for NLGEO films. Significant synergistic effects in chemical and bacterial preservation of chicken fillet samples were observed by NLGEO films. The optimal mechanical and barrier properties of chitosan-NLGEO films introduced it a potential active packaging to extend the shelf life of chicken fillet.


Assuntos
Quitosana/química , Embalagem de Alimentos/métodos , Nanocompostos/química , Óleos Voláteis/química , Produtos Avícolas/análise , Produtos Avícolas/microbiologia , Compostos Alílicos/química , Animais , Bactérias/classificação , Bactérias/efeitos dos fármacos , Bactérias/crescimento & desenvolvimento , Galinhas , Quitosana/farmacologia , Conservação de Alimentos , Óleos Voláteis/farmacologia , Sulfetos/química
12.
ACS Appl Mater Interfaces ; 13(1): 1398-1412, 2021 Jan 13.
Artigo em Inglês | MEDLINE | ID: mdl-33398990

RESUMO

Nanotechnology-based packaging may improve food quality and safety, but packages manufactured with polymer nanocomposites (PNCs) could be a source of human dietary exposure to engineered nanomaterials (ENMs). Previous studies showed that PNCs release ENMs to foods predominantly in a dissolved state, but most of this work used food simulants like dilute acetic acid and water, leaving questions about how substances in real foods may influence exposure. Here, we demonstrate that food and beverage ingredients with reducing properties, like sweeteners, may alter exposure by inducing nanoparticle formation in foods contacting silver nanotechnology-enabled packaging. We incorporated 12.8 ± 1.4 nm silver nanoparticles (AgNPs) into polyethylene and stored media containing reducing ingredients in packages manufactured from this material under accelerated room-temperature and refrigerated conditions. Analysis of the leachates revealed that reducing ingredients increased the total silver transferred to foods contacting PNC packaging (by as much as 7-fold) and also induced the (re)formation of AgNPs from this dissolved silver during storage. AgNP formation was also observed when Ag+ was introduced to solutions of natural and artificial sweeteners (glucose, sucrose, aspartame), commercial beverages (soft drinks, juices, milk), and liquid foods (yogurt, starch slurry), and the amount and morphology of reformed AgNPs depended on the ingredient formulation, silver concentration, storage conditions, and light exposure. These results imply that food and beverage ingredients may influence dietary exposure to nanoparticles when PNCs are used in packaging applications, and the practice of using food simulants may in certain cases underpredict the amount of ENMs likely to be found in foods stored in these materials.


Assuntos
Bebidas , Embalagem de Alimentos , Nanopartículas Metálicas/química , Prata/química , Animais , Aspartame/química , Temperatura Baixa , Contaminação de Alimentos/análise , Glucose/química , Nanopartículas Metálicas/análise , Oxirredução , Polietileno/química , Prata/análise , Amido/química , Sacarose/química , Edulcorantes/química , Iogurte
13.
Int J Food Microbiol ; 341: 109047, 2021 Mar 02.
Artigo em Inglês | MEDLINE | ID: mdl-33515813

RESUMO

Nowadays, adding biological compounds to food packaging is one of the types of active packaging. The aim of this study was to prepare a new degradable coating with free and nano-encapsulated Cumino cyminum L. essential oil (CCEO) with nanochitosan (Nch) base to evaluate the microbial, chemical and sensory properties of sardine fillet samples for 16 days at 4 °C. Nanoliposome using different soy lecithin ratios and cholesterol concentrations (60:0, 50:10, 40:20, and 30:30) and technique of thin-film hydration-sonication, were prepared with a range of 140-164 nm size. Encapsulation efficiency (EE) and distribution of nanoliposomes size were calculated 0.80-0.90 and 49.85-73.01% respectively. To coat sardine fillet samples, nanoliposomes with the lower size of droplet and higher EE percent were selected. The outcomes indicated that coating treatments can effectively inhibit microbial growth and chemical spoilage reflected at lower pH, peroxide value (PV) and thiobarbituric acid reactive substances (TBARs) (P < 0.05). In fact, the results of chemical and microbiological characteristics showed that the samples treated with nanocitosan/nano essential oil (NEO) showed the lowest value among other treatments during the experimental period, in the following, Nch-EO, Nch and control. pH, PV, TBARs, total viable counts (TVC), total pseudomonads count (TPC), and lactic acid bacteria (LAB) were 6.85, 0.03 (mg MDA/kg), 5.23 (mEq/kg), 3.67 (CFU/g), 3.47 (CFU/g), and 4.7 (CFU/g), respectively for Nch-NEO at the end of storage time. In addition, during the experimental period, the highest sensory properties were obtained for the Nch-NEO group. Encapsulation of CCEO reduces the rate of diffusion, thus increasing antimicrobial and antioxidant activity, as well as improving sensory properties. According to the results of this study, CCEO-encapsulated nanochitosan coatings can be used as a potent coating to increase sardine shelf life.


Assuntos
Antibacterianos/farmacologia , Quitosana/farmacologia , Cuminum/química , Embalagem de Alimentos/métodos , Óleos Voláteis/farmacologia , Alimentos Marinhos/microbiologia , Animais , Antioxidantes/química , Antioxidantes/farmacologia , Carga Bacteriana/efeitos dos fármacos , Quitosana/química , Colesterol/farmacologia , Peixes/microbiologia , Conservação de Alimentos/métodos , Armazenamento de Alimentos/métodos , Lecitinas/farmacologia
14.
Int J Food Microbiol ; 340: 109053, 2021 Feb 16.
Artigo em Inglês | MEDLINE | ID: mdl-33461000

RESUMO

Sixty vacuum-packed beef samples retailed in Germany were investigated for the occurrence of cold-tolerant Clostridium spp. After a storage period at 4 °C for eight weeks, meat juice from all samples was processed for culturing, DNA extraction and SYBR green qPCR for Clostridium species. After that, a previously developed multiplex qPCR, sequence analysis of the 16S rRNA gene, and MALDI-TOF MS were applied in order to identify Clostridium spp. found in samples. Subsequently, 23 samples were found positive for C. frigoriphilum (n = 19), C. estertheticum (n = 2), C. tagluense (n = 1) and C. lacusfryxellense/C. frigoris (n = 1). By using a new multiplex qPCR and a new RFLP method developed in this study, a further 15 meat juice samples were revealed to be contaminated with C. algidicarnis. With some samples being co-contaminated with two different species, 53% (n = 32) of all investigated vacuum-packed beef samples were found to be positive for cold-tolerant clostridia. This is the first report of detection and identification of C. algidicarnis in meat samples in Germany and Central Europe.


Assuntos
Clostridium/isolamento & purificação , Embalagem de Alimentos , Carne Vermelha/microbiologia , Animais , Bovinos , Clostridium/classificação , Clostridium/fisiologia , Temperatura Baixa , Europa (Continente) , Alemanha , Reação em Cadeia da Polimerase Multiplex , RNA Ribossômico 16S/genética , Vácuo
15.
Food Chem ; 347: 129051, 2021 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-33476921

RESUMO

A way to reduce food waste is related to the increase of the shelf-life of food as a result of improving the package type. An innovative active food packaging material based on cocrystallization of microbiologically active compounds present in essential oils i.e. carvacrol, thymol and cinnamaldehyde was developed following the Quality by Design principles. The selected active components were used to produce antimicrobial plastic films with solidified active ingredients on their surface characterized by antimicrobial properties against four bacterial strains involved in fruit and vegetable spoilage. The developed packaging prototypes exhibited good antimicrobial activity in vitro providing inhibition percentage of 69 (±15)% by contact and inhibition diameters of 32 (±6) mm in the gas phase, along with a prolonged release of the active components. Finally, the prolonged shelf-life of grape samples up to 7 days at room temperature was demonstrated.


Assuntos
Anti-Infecciosos/química , Embalagem de Alimentos/métodos , Óleos Voláteis/química , Acroleína/análogos & derivados , Acroleína/química , Acroleína/farmacologia , Anti-Infecciosos/farmacologia , Cristalização , Cimenos/química , Cimenos/farmacologia , Escherichia coli/efeitos dos fármacos , Microbiologia de Alimentos , Qualidade dos Alimentos , Testes de Sensibilidade Microbiana , Salmonella typhimurium/efeitos dos fármacos , Staphylococcus aureus/efeitos dos fármacos , Timol/química , Timol/farmacologia
16.
Food Chem ; 343: 128430, 2021 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-33406575

RESUMO

In this study, the influence of the concentration of flour from jabuticaba peel (FJP) and the concentration of glycerol (CG) on the physicochemical, barrier, mechanical, optical, spectroscopic and biodegradability properties of corn starch films was evaluated using response surface methodology. The increase in the concentrations of FJP and CG enhanced the thickness and permeability to water vapor, and made the films more hydrophilic. In addition to that, the interaction between the two variables caused reduction in the solubility of the films. High concentrations of FJP and CG reduced the maximum tensile strength, and increased CG increased the elongation and decreased the young's modulus of the films. Among the tests studied, the T1 film (15.80% FJP and 15.80% CG) was biodegradable, presenting the best mechanical and barrier properties such as low water vapor permeability, solubility and water holding capacity, showing great potential to be used as biodegradable packaging system.


Assuntos
Biopolímeros/química , Farinha/análise , Myrtaceae/metabolismo , Amido/química , Biopolímeros/metabolismo , Embalagem de Alimentos/métodos , Glicerol/química , Interações Hidrofóbicas e Hidrofílicas , Permeabilidade , Solubilidade , Resistência à Tração , Água/química
17.
Food Chem ; 347: 129006, 2021 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-33472117

RESUMO

Multilayer bottles consisting of chitosan (CS), microcrystalline cellulose (MCC), whey protein isolate (WPI), and polyethylene terephthalate (PET) were tested as novel materials for packaging and extending shelf life of rosebud beverages. We studied the storage stability at 4 °C, 25 °C, 37 °C, and 55 °C by assessing the physical and biochemical parameters. The results show that multilayer PET bottles had better barrier performance and improved soluble solids content, pH, polyphenol content, color indices, and browning degree in rosebud beverages over the control at all studied temperatures. A shelf life model was established based on the Arrhenius equation, and the number of days when polyphenol contents dropped to <50% of the initial content was defined as the shelf life. Our results highlight the reliability of the prediction model, and we conclude that packaging rosebud beverages in multilayer PET bottles significantly extends the product shelf life, and this benefit was further extended at low temperatures.


Assuntos
Bebidas/análise , Celulose/química , Quitosana/química , Embalagem de Alimentos/métodos , Polietilenotereftalatos/química , Proteínas do Soro do Leite/química , Cor , Armazenamento de Alimentos , Concentração de Íons de Hidrogênio , Polifenóis/química , Temperatura
18.
Food Chem ; 347: 128960, 2021 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-33461116

RESUMO

In this paper, temperature sensitive polymer p(MAH-ß-CD-co-NIPAM) was used as extraction in DLLME, because its phase transition behavior can be observed at room temperature due to Hofmeister and non-co-solvent effect. The whole pretreatment process is simple and fast, and the extraction process did not require dispersant to assist dispersion and centrifugation to collect the adsorbent. A new analytical method based on DLLME coupled with HPLC-UV was developed to detect five types of BPs in milk and take-out packaging. The limits of detection ranged from 0.44 to 1.60 ng mL-1 (S/N = 3). The relative recoveries of 5 BPs in food packaging were in the range of 91.08-108.04%.


Assuntos
Embalagem de Alimentos , Limite de Detecção , Microextração em Fase Líquida/métodos , Polímeros/química , Temperatura , Cromatografia Líquida de Alta Pressão , Solventes/química , Fatores de Tempo
19.
Food Chem ; 346: 128883, 2021 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-33434864

RESUMO

Bacteriophages (phages) have been extensively utilized as antibacterial agents in the food industry because of their host-specificity. However, their application in polymer films has been limited because of the lack of a strong attachment method for phage to the surface. We developed an antibacterial film by covalently immobilizing Escherichia coli (E. coli)-specific phage T4 on a polycaprolactone (PCL) film. The chemical bond formation was confirmed by XPS analysis, and the covalent attachment of phage T4 effectively inhibited E. coli growth even after external stimulation of the film by sonication. When applied as a packaging film for raw beef inoculated with E. coli O157:H7, the chemically functionalized PCL film showed approximately 30-fold higher bacterial inhibitory effects than the film with physically adsorbed phage T4. These results indicate the promising application potential of chemically functionalized PCL film with phage T4 as an antibacterial food packaging material against the foodborne pathogen E. coli.


Assuntos
Bacteriófago T4/química , Escherichia coli O157/crescimento & desenvolvimento , Embalagem de Alimentos/métodos , Poliésteres/química , Animais , Bacteriófago T4/patogenicidade , Bovinos , Escherichia coli O157/virologia , Microbiologia de Alimentos , Embalagem de Alimentos/instrumentação , Carne/microbiologia
20.
Ecotoxicol Environ Saf ; 208: 111620, 2021 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-33396140

RESUMO

Di(2-ethylhexyl) adipate (DEHA) is a widely used plasticizer and prevalent environmental contaminant. In this study, DEHA concentrations in the milk, cheese, and butter samples wrapped with food-grade commercial polyethylene films and stored at 4 °C for 30 days were detected using gas chromatographic analysis. Also, the effects of exposure to a high dose of DEHA for a long duration on the liver, brain, and heart of Wistar rats were assessed. Besides, the possible beneficial effect of Peganum harmala oil (PGO), in relieving DEHA induced adverse effects was explored. For this purpose, four groups (8 rats/group) were orally given physiological saline, PGO (320 mg/kg bwt), DEHA (2000 mg/kg bwt), or PGO + DEHA for 60 days. The results revealed that the DEHA concentrations in the tested dairy products were ordered as follows: (butter > cheese > milk). Notably, the detected levels in butter were higher than the specific migration limit in foods. DEHA induced a significant increase in the serum levels of glucose, alanine transaminase, aspartate transaminase, acetylcholine esterase, creatine kinase-myocardium bound, malondialdehyde, tumor necrosis factor-α, and interleukin-1ß. But, significant hypoproteinemia, hypoalbuminemia, hypoglobulinemia, and hypocholesterolemia were evident following DEHA exposure. A significant reduction in the serum level of superoxide dismutase, reduced glutathione, and brain-derived neurotrophic factor was recorded. Besides, a significant downregulation in hepatic CYP2E1, brain glial fibrillary acidic protein, and cardiac troponin I gene expression was noticed. Moreover, DEHA exposure induced a significant decrease in Bcl-2 immunolabeling, but Caspase-3 immunoexpression was increased. On the contrary, PGO significantly recused DEHA injurious impacts. Therefore, PGO could represent a promising agent for preventing DEHA-induced hepatotoxicity, neurotoxicity, and cardiotoxicity.


Assuntos
Adipatos/toxicidade , Encéfalo/efeitos dos fármacos , Coração/efeitos dos fármacos , Fígado/efeitos dos fármacos , Peganum/química , Óleos Vegetais/farmacologia , Plastificantes/toxicidade , Adipatos/análise , Anemia/sangue , Anemia/prevenção & controle , Animais , Glicemia/análise , Encéfalo/metabolismo , Encéfalo/patologia , Laticínios/análise , Embalagem de Alimentos , Fígado/metabolismo , Fígado/patologia , Testes de Função Hepática , Masculino , Miocárdio/metabolismo , Miocárdio/patologia , Estresse Oxidativo/efeitos dos fármacos , Plastificantes/análise , Ratos , Ratos Wistar , Fatores de Tempo
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