Kelvi W.E. MirandaMaryana M. FrotaAdriano L.A. MattosAntonio Willian O. Araujo...
101442.1-101442.16页
查看更多>>摘要：The search for sustainable materials is driven by the depletion of petrochemical resources and the environmentalimpact of plastics across various biomes. In this context, the present study develops eco-friendly films usingbacterial cellulose derived from agro-industrial soursop (Annona muricata L.) wastes (BC-S) in ternary blends (TB)with poly(vinyl alcohol), polyvinylpyrrolidone, and poly(ethylene glycol). This blend showed a total concentrationof 7,0 wt% with 8:1:1 proportion polymeric, respectively. The incorporation of BC-S (1.0, 3.0, and 5.0 %,v/v) resulted in: (ⅰ) the formation of homogeneous single-layer films; (ⅱ) significant enhancement of mechanicalproperties, such as tensile strength (> 25.73 MPa), elongation at break (> 148.60 %), and increase in Young’smodulus (> 3.0 GPa) by 73.9 %; (ⅲ) excellent UV radiation protection, for UV-C (200–280 nm) an increase of7.5 %; (ⅳ) good water vapor barrier properties with a 54.5 % reduction; and (ⅴ) low transmittance and hightransparency (an increase of 59.2 %) compared to the control treatment. The results demonstrate the potential of5 % (v/v) BC-S derived from agro-industrial residues for sustainable applications as a reinforcement agent inbionanocomposites for food packaging. Therefore, it bolsters the concept of upcycling and eco-friendly packagingsolutions.
查看更多>>摘要：Mangoes are nutritious but perishable fruits. The in situ packaging of fruit surfaces with nanofibers is a promisingstudy for fruit preservation. Polycaprolactone/ethyl cellulose (PCL/EC) nanofibrous films loaded with natamycin(Nata) and trans-cinnamic acid (tCA) (PCL/EC/Nt-p) were prepared in situ on the surface of mangoes usinghandheld microfluidic-blow-spinning (MBS) to enhance mango storage quality. The results show that the PCL/EC/Nt-p nanofibers had an average diameter of 321.82 ± 10.06 nm and displayed a smooth and uniformmorphology. The lower Young’s modulus facilitated easy peeling of the nanofibrous films from the mangoessurface with less force before consumption. In addition, the PCL/EC/Nt-p nanofibrous film had an ideal hydrophobicityand water vapor transmission rate, which protected their structural integrity in high-humidityenvironments and also reduced water loss from the treated mangoes. Storage results show that the mangoestreated with PCL/EC/Nt-p nanofibrous films exhibited the smallest lesion diameter and a decay index 20 % lowerthan untreated mango. Moreover, after 9 days of storage, the decrease in SOD, CAT, POD, and APX antioxidantenzyme activities was delayed in the PCL/EC/Nt-p nanofibrous film treated mangoes, confirming the film’sability to enhance antioxidant capacity and slow down metabolic processes. This study provides valuable insightsto facilitate the research on in situ fruit preservation packaging, the widespread adoption of microfluidic-blowspinningand the handheld spinning machine.
查看更多>>摘要：This work investigated the effects of temperature, storage time and vibration related to mineral water transport,on the migration of antimony (Sb) present in polyethylene terephthalate (PET) bottles. Sb was quantified byinductively coupled plasma optical emission spectrometry (ICP-OES). Different conditions were used, such as,storage time: 3, 7, 10, 14 and 21 days, temperature: 40, 50 and 60 ℃ and vibration: sinusoidal, random and novibration. The concentrations of Sb in mineral water after 21 days of storage were lower than the limit ofquantification (LOQ = 1.0 μg ℓ~(-1)) of the method at 40 ℃ for the three types of vibration. At 50 ℃, Sb concentrationswere between 1.72 μg ℓ~(-1) and 1.96 μg ℓ~(-1). Sb migration was greater after 21 days of contact at 60 ℃,with values greater than 4.00 μg ℓ~(-1). The main factors that affected the increase in Sb migration were temperatureand storage time. The effects of sinusoidal and random vibration during the transport simulation did notaffect the increase in Sb migration.
查看更多>>摘要：Flavor scalping, a food quality loss caused by packaging materials. The study investigated the volatile compoundsin food plastic packaging materials, green tea, and their interactions during storage. Staleness in green tea wascharacterized by increased alcohols, aldehydes, and ketones, with the severity varying based on the packagingmaterial. Polyethylene (PE), polyethylene terephthalate (PET), and aluminum-plastic composite (AP) packagingexhibited lower adsorption capacity for tea volatile compounds, contributing to the stability of these compoundsduring storage. Furthermore, nine off-odor volatile compounds were identified in seven types of packagingmaterials. Notably, migration of 2,4-di-tert-butylphenol, a compound with a leather-like odor found in higherconcentrations in polypropylene (PP) packaging, resulted in a decline in the sensory evaluation scores of thegreen tea infusion. Hence, the adsorption capacity and migration of odor compounds from packaging materialsare crucial factors for green tea flavor. These findings provide insights into flavor scalping in green tea.
查看更多>>摘要：Three Sauvignon Blanc wines sealed with seven closure types (natural corks, three microagglomerate corks,synthetics and two screw caps) were analyzed after 12 years of aging. OTR (oxygen transfer rate) of old stoppers(12 years) were determined by a strandardized protocol using coulometry. The other analytical markers werevolatile thiols and Strecker aldehydes determined by gas chromatography coupled with tandem mass spectrometry.Sulfites, dissolved CO_2 measurements and sensory analysis of the wines were also carried out. Weshowed that the OTR value changed after 12 years and the variability depends on the type of stoppers and rangedfrom 0.05 to 89.11 mg/year. The molecular markers analysed made it possible to illustrate the sensoryperception of the evolution of this wine. Molecular characterisation revealed that an average OTR_(12years) of0.27 mg/year allows preservation of thiols while delaying the formation of Strecker aldehydes whereas beyond0.82 mg/year in average, wines develop first signs of oxidation.
查看更多>>摘要：The transfer of intentionally added substances (IAS) and non-intentionally added substances (NIAS) from foodcontact materials is usually investigated by means of migration tests. However, detailed knowledge about thestability of NIAS in food simulants during migration is scarcely available although it is considered essential forrisk assessments. In this study we performed migration and stability tests with the known NIAS breakdownproduct 7,9-di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione (S.1, a.k.a. Arvin 8) in 4 % acetic acid and50 % ethanol. Maximum migration values for S.1 were reached faster in 50 % ethanol but decreased significantlyover time due to the instability of S.1 in this solvent. LC-MS/MS and LC-QTOF-MS analysis enabled the determinationof two transformation products including the known 3-(3,5-di-tert-butyl-1-hydroxy-4-oxo-2,5-cyclohexadien-1-yl)propionic acid (S.2), whilst the second (S.3) was not described, yet. The preparative isolation ofS.3 by countercurrent chromatography (CCC) followed by 1H NMR analysis enabled to identify the secondcompound as ethyl 3-(3,5-di-tert-butyl-1-hydroxy-4-oxocyclohexa-2,5-dien-1-yl)propanoate. The short-term formationof the novel intermediate product S.3 was the main reason for the high instability of S.1 in 50 % ethanol.In contrast to that, the polymer matrix was shown to be responsible for the slowdown of the lactone-ring openingreaction converting S.1 into S.2 and S.3. The present findings confirmed the potential influence of different foodsimulants and co-migrating polymer matrix residuals on the migration test results of S.1. Knowledge on theseeffects is a key factor for the meaningful food safety risk assessment of the migration of S.1.
查看更多>>摘要：Rice straw extracts (RSE) were obtained by subcritical water extractions at 160 ℃ (RSE160) and 180 ℃(RSE180). These extracts were analysed as to the main components, phenol content and formation of 5-Hydroxymethylfurfural(5-(hydroxymethyl)furan-2-carbaldehyde (HMF). These were incorporated (6 % wt.) into PHBVfilms by melt blending and compression moulding. Films were characterised as to their physical properties,structural and thermal behaviour, and overall and specific migration of the phenols and HMF in different foodsimulants. Thermal processing of the films led to a partial degradation of the extracted sugars, producing microholesin the matrix and HMF formation. The RSE slightly reduced the polymer crystallinity, the film stretchability,fracture resistance, and barrier capacity to water vapour and limonene, but improved the oxygen barrierof the films and enhanced their UV light barrier due to the phenol content and antioxidant capacity. The PHBVmigration did not reach the overall migration limit (10 mg/dm~2) in any simulant while the specific migration ofphenols and HMF depended on the food simulant and its concentrations in the films. The near total release of thephenols present in the films was achieved in less polar simulants, equivalent to 30–40 mg GAE/kg of packagedfood, for RSE180 films. HMF was mainly released in acidic simulants and those containing ethanol, reaching amaximum value of 0.36 mg/kg, for RSE180 films in which more HMF was formed. This value was much lowerthan those HMF levels found in many commonly-consumed foods. Therefore, the materials can be consideredsafe for food packaging.
Han Lyn FoongRabiha SulaimanEzzat Mohamad AzmanRozzamri Ashari...
101455.1-101455.10页
查看更多>>摘要：In this study, polylactic acid (PLA)/cinnamon bark oil (CBO) films were prepared via solvent casting method andcharacterised for their physical, optical, mechanical, and antioxidant properties. A 15 % loading of CBOsignificantly (p < 0.05) improved the water vapour barrier, tensile strength, and elongation at break, while itseffects on film thickness and water solubility were insignificant (p ≥ 0.05). At a 30 % CBO concentration, thefilms exhibited over 99 % UV light blockage at wavelengths of 200, 280, and 400 nm. Antioxidant assaysdemonstrated strong radical scavenging activities, with maximum DPPH and ABTS scavenging values of 93.30 %and 99.40 %, respectively. Controlled phenolic migration studies were conducted using aqueous (10 % ethanol),lipophilic (50 % ethanol), and acidic (3 % acetic acid solution) food simulants to investigate the behaviour of thePLA/CBO film and their antioxidant activities in various food systems. The migration results followed anexponential time-dependent trend, with the highest migration in 50 % ethanol, indicating the films’ efficacy inpreventing oxidative deterioration in fatty foods. These findings demonstrate the potential of PLA/CBO films asactive and sustainable packaging materials, offering enhanced barrier, mechanical, and antioxidant propertiescompared to pure PLA films, making them promising candidates for reducing food waste and extending productshelf life.
Bina BhattaraiEva Bay WedebyeNikolai Georgiev NikolovTommy Licht Cederberg...
101456.1-101456.9页
查看更多>>摘要：Polyethylene terephthalate (PET) is a polymer approved for recycling for food grade applications in the EU.Recycling PET for food grade applications is desirable from sustainability perspective; however, its safetyassessment is a challenge due to the potential presence of different types of non-intentionally added substances(NIAS). Identification of NIAS is important for risk assessment and devising appropriate exposure limits. Ananalytical testing strategy based on high-resolution LC-MS has been presented and applied to food contactmaterials of virgin PET (vPET) and repeatedly recycled PET (rPET) produced using Starlinger Decon technology.We devised an analytical strategy using data-dependent acquisition technique and used InChI strings to identifythe peaks with a high level of confidence. We identified 23 peaks in the samples by using the developedanalytical testing strategy that were largely oligomers of different series and lengths, acids, and cyclic monomer.We semi-quantified the peaks and did not notice any statistically significant difference between vPET andrepeatedly recycled PET samples. The identified substances were screened for potential Carcinogenicity, Mutagenicityand Reproductive toxicity (CMR); and for endocrine potential models of action represented as Estrogen,Androgen, Thyroid, Steroidogenic – and Retinoic acid (EATS-R) related modalities using the Danish quantitativestructure activity relationship (QSAR) Database. The QSAR screening showed predicted flags for CMR and EATSRfor some of the substances. As the experimental information on the toxicity of PET oligomers is very limited,there is a need for in vitro testing, followed up with further testing depending on the findings, to perform hazardcharacterization.
查看更多>>摘要：pH-responsive materials control the release of active substances by responding to pH changes in the environment.In this study, based on the properties of imine bond with acid-sensitive hydrolysis and mild reactionconditions, cinnamaldehyde was immobilized onto aminated gelatin (AGel) films to generate cinnamaldehyde/aminated gelatin (Cin/AGel) films, which were then applied to preserve cherries. FTIR and XPS confirmed thesynthesis of imine bonds. The excellent pH-responsive controlled-release properties of Cin/AGel films weredemonstrated by monitoring changes in the cumulative release fraction of cinnamaldehyde in the aqueous phase(different pH buffers) and in atmospheric environments (different CO_2 concentrations and humidity). Even whennot in direct contact with the aqueous phase, it can nevertheless provide effective regulated release to theacidified environment caused by CO_2 accumulation and high humidity conditions. Furthermore, the Cin/AGelfilms had smart antibacterial properties. Compared to PE and AGel films, Cin/AGel film packaging increased theshelf life of cherries by 9 and 6 days at 4 ℃, respectively. As a result, the shown pH-responsive controlled-releasefilms have promising applications in controlling the release of antimicrobial agents during food preservation.
NETL
NSTL
Elsevier