المؤلفون: Freitas, Pedro A. V., González-Martínez, Consuelo, Chiralt, Amparo

المصدر: Food and Bioprocess Technology ; volume 16, issue 11, page 2635-2650 ; ISSN 1935-5130 1935-5149

مصطلحات موضوعية: Industrial and Manufacturing Engineering, Process Chemistry and Technology, Safety, Risk, Reliability and Quality, Food Science

الوصف: Aqueous extracts from rice straw (RS), using ultrasound-assisted reflux heating extraction (USHT) and subcritical water extraction (SWE), under two process conditions (160 °C, 7 bars; and 180 °C, 11 bars), were obtained and characterised as to their phenolic content and antioxidant and antimicrobial capacities. These extracts were incorporated (6% wt.) into poly (lactic acid) (PLA) films by melt blending and compression moulding that were characterised as to their structural and functional properties and their capacity to preserve fresh pork meat, as vacuum thermo-sealed bags, throughout 16 days of cold storage. The extracts slightly reduced the extensibility, resistance to break, and water barrier capacity of the PLA films but enhanced their oxygen barrier capacity and the UV light-blocking effect. The films with RS extracts were effective at preserving meat quality parameters, inhibiting microbial growth, meat oxidation, discolouration, and weight loss. The SWE extract obtained at 180 °C was the most effective at obtaining active films for meat preservation, exhibiting the greatest antioxidant and antibacterial activity. Therefore, the green SWE technique is useful for obtaining active extracts from RS, allowing for its valorisation in the development of biodegradable active materials useful to preserve food quality.

الإتاحة: https://doi.org/10.1007/s11947-023-03081-6Test

المؤلفون: Freitas, Pedro A. V.¹ (AUTHOR) cgonza@tal.upv.es, González-Martínez, Chelo¹ (AUTHOR), Chiralt, Amparo¹ (AUTHOR)

المصدر: Polymers (20734360). Jun2024, Vol. 16 Issue 11, p1474. 22p.

مصطلحات موضوعية: *RICE straw, *VAPOR barriers, *MATERIAL biodegradation, *CELLULOSE, *BIODEGRADABLE materials, *LACTIC acid, *POLYLACTIC acid, *STARCH

مستخلص: The stability and composting behaviour of monolayers and laminates of poly (lactic acid) (PLA) and starch with and without active extracts and cellulose fibres from rice straw (RS) were evaluated. The retrogradation of the starch throughout storage (1, 5, and 10 weeks) gave rise to stiffer and less extensible monolayers with lower water vapour barrier capacity. In contrast, the PLA monolayers, with or without extract, did not show marked changes with storage. However, these changes were more attenuated in the bilayers that gained water vapour and oxygen barrier capacity during storage, maintaining the values of the different properties close to the initial range. The bioactivity of the active films exhibited a slight decrease during storage, so the antioxidant capacity is better preserved in the bilayers. All monolayer and bilayer films were fully composted within 90 days but with different behaviour. The bilayer assembly enhanced the biodegradation of PLA, whose monolayer exhibited a lag period of about 35 days. The active extract reduced the biodegradation rate of both mono- and bilayers but did not limit the material biodegradation within the time established in the Standard. Therefore, PLA–starch laminates, with or without the valorised fractions from RS, can be considered as biodegradable and stable materials for food packaging applications. [ABSTRACT FROM AUTHOR]

المؤلفون: Freitas, Pedro A. V., Martín-Pérez, Laia, Gil-Guillén, Irene, González-Martínez, Chelo, Chiralt, Amparo

المصدر: Foods; Oct2023, Vol. 12 Issue 20, p3759, 18p

مصطلحات موضوعية: MANUFACTURING processes, ESCHERICHIA coli, ALMOND, CELLULOSE

مستخلص: Almond skin (AS) is an agro-industrial residue from almond processing that has a high potential for valorisation. In this study, subcritical water extraction (SWE) was applied at two temperatures (160 and 180 °C) to obtain phenolic-rich extracts (water-soluble fraction) and cellulose fibres (insoluble fraction) from AS. The extraction conditions affected the composition and properties of both valorised fractions. The dry extracts obtained at 180 °C were richer in phenolics (161 vs. 101 mg GAE. g⁻¹ defatted almond skin (DAS)), with greater antioxidant potential (1.063 vs. 1.490 mg DAS.mg⁻¹ DPPH) and showed greater antibacterial effect (lower MIC values) against L. innocua (34 vs. 90 mg·mL⁻¹) and E. coli (48 vs. 90 mg·mL⁻¹) than those obtained at 160 °C, despite the lower total solid yield (21 vs. 29%) obtained in the SWE process. The purification of cellulose from the SWE residues, using hydrogen peroxide (H2O2), revealed that AS is not a good source of cellulose material since the bleached fractions showed low yields (20–21%) and low cellulose purity (40–50%), even after four bleaching cycles (1 h) at pH 12 and 8% H2O2. Nevertheless, the application of a green, scalable, and toxic solvent-free SWE process was highly useful for obtaining AS bioactive extracts for different food, cosmetic, or pharmaceutical applications. [ABSTRACT FROM AUTHOR]

: Copyright of Foods is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Hernández-García, Eva, Freitas, Pedro A. V., Zomeño, Pedro, González-Martínez, Chelo, Torres-Giner, Sergio

المصدر: Applied Sciences (2076-3417); Jan2023, Vol. 13 Issue 1, p179, 25p

مصطلحات موضوعية: FOOD packaging, THERMO-optical effects, CIRCULAR economy, SURFACE coatings, THIN films, EDIBLE coatings, PLASTICS

مستخلص: Featured Application: One of the main technological challenges within Circular Economy strategies is to minimize the environmental impact of plastic packaging. In this regard, the use of PHBV films to coat paper sheets represents a highly sustainable strategy to produce food packaging multilayer structures with improved mechanical and barrier properties. This work reports on the development and performance evaluation of newly developed paper sheets coated, on both sides, with thin films of biodegradable poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) for applications of food packaging. For this, PHBV/paper/PHBV multilayers were first prepared by the thermo-sealing technique, optimizing the process variables of temperature and time. Thereafter, the multilayer sheets were characterized in terms of their morphological, optical, thermal, mechanical, and barrier properties and compared with equivalent paper structures double coated with high-barrier multilayer films of petrochemical polymers. The results indicated that the double coatings of PHBV successfully improved the mechanical resistance and ductility, protected from moisture, and also reduced the aroma and oxygen permeances of paper, having a minimal effect on its optical and thermal properties. Finally, the compostability of the resultant multilayer sheets was analyzed, confirming that the presence of the PHBV coatings slightly delayed the aerobic biodegradation and disintegration of paper. [ABSTRACT FROM AUTHOR]

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المؤلفون: de Oliveira, Taíla V., de Freitas, Pedro Augusto V., Pola, Cícero C., da Silva, José Osvaldo R., Diaz, Lina Daniela A., Ferreira, Sukarno Olavo, Soares, Nilda de F.F.

المساهمون: Conselho Nacional de Desenvolvimento Científico e Tecnológico

المصدر: Food Packaging and Shelf Life ; volume 24, page 100459 ; ISSN 2214-2894

مصطلحات موضوعية: Microbiology (medical), Polymers and Plastics, Safety, Risk, Reliability and Quality, Biomaterials, Food Science

الإتاحة: https://doi.org/10.1016/j.fpsl.2019.100459Test
https://api.elsevier.com/content/article/PII:S2214289419303527?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S2214289419303527?httpAccept=text/plainTest

المؤلفون: Freitas, Pedro A. V., Barrrasa, Hector, Vargas, Fátima, Rivera, Daniel, Vargas, Maria, Torres-Giner, Sergio

المصدر: Applied Sciences (2076-3417); Feb2022, Vol. 12 Issue 4, p2111, 27p

مصطلحات موضوعية: REACTIVE extrusion, FOOD aroma, BIODEGRADABLE plastics, CELLULOSE, ATOMIZATION, DICUMYL peroxide, FOOD packaging

مستخلص: Featured Application: The sensitivity of our society has increased by the effect of petrochemical plastics on the environment, which has fostered the development of biodegradable materials derived from natural resources. This study puts forth the potential use of the atomization process to microdisperse cellulose structures that can be later incorporated into biopolyester films through a process of reactive extrusion, without altering the optical properties, and improving their performance. The present study focuses on the preparation and characterization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) films that were reinforced with cellulose microstructures to obtain new green composite materials for sustainable food packaging applications. The atomization of suspensions of microfibrillated cellulose (MFC) successfully allowed the formation of ultrathin cellulose structures of nearly 3 µm that were, thereafter, melt-mixed at 2.5, 5, and 10 wt % with PHBV and subsequently processed into films by thermo-compression. The most optimal results were attained for the intermediate MFC content of 5 wt %, however, the cellulose microstructures showed a low interfacial adhesion with the biopolyester matrix. Thus, two reactive compatibilizers were explored in order to improve the properties of the green composites, namely the multi-functional epoxy-based styrene-acrylic oligomer (ESAO) and the combination of triglycidyl isocyanurate (TGIC) with dicumyl peroxide (DCP). The chemical, optical, morphological, thermal, mechanical, and barrier properties against water and aroma vapors and oxygen were analyzed in order to determine the potential application of these green composite films in food packaging. The results showed that the incorporation of MFC yielded contact transparent films, whereas the reactive extrusion with TGIC and DCP led to green composites with enhanced thermal stability, mechanical strength and ductility, and barrier performance to aroma vapor and oxygen. In particular, this compatibilized green composite film was thermally stable up to ~280 °C, whereas it showed an elastic modulus (E) of above 3 GPa and a deformation at break (ɛb) of 1.4%. Moreover, compared with neat PHBV, its barrier performance to limonene vapor and oxygen was nearly improved by nine and two times, respectively. [ABSTRACT FROM AUTHOR]

: Copyright of Applied Sciences (2076-3417) is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Freitas, Pedro A. V., Arias, Carla I. La Fuente, Torres-Giner, Sergio, González-Martínez, Chelo, Chiralt, Amparo

المصدر: Applied Sciences (2076-3417); Sep2021, Vol. 11 Issue 18, p8433, 20p

مصطلحات موضوعية: RICE straw, MICROFIBERS, CELLULOSE, CORNSTARCH, BIOPOLYMERS, VAPOR barriers

مستخلص: Application Feature: Cellulose microfibers (CMFs) obtained from rice straw (RS) waste represent an environmentally friendly alternative to mechanically reinforce thermoplastic starch (TPS) films. Moreover, their combination with starch modified by dry heating (DH) results in novel biopolymer films with higher barrier to water vapor that can be of application interest in, for instance, food packaging. In the present study, agro-food waste derived rice straw (RS) was valorized into cellulose microfibers (CMFs) using a green process of combined ultrasound and heating treatments and were thereafter used to improve the physical properties of thermoplastic starch films (TPS). Mechanical defibrillation of the fibers gave rise to CMFs with cumulative frequencies of length and diameters below 200 and 5–15 µm, respectively. The resultant CMFs were successfully incorporated at, 1, 3, and 5 wt% into TPS by melt mixing and also starch was subjected to dry heating (DH) modification to yield TPS modified by dry heating (TPSDH). The resultant materials were finally shaped into films by thermo-compression and characterized. It was observed that both DH modification and fiber incorporation at 3 and 5 wt% loadings interfered with the starch gelatinization, leading to non-gelatinized starch granules in the biopolymer matrix. Thermo-compressed films prepared with both types of starches and reinforced with 3 wt% CMFs were more rigid (percentage increases of ~215% for TPS and ~207% for the TPSDH), more resistant to break (~100% for TPS and ~60% for TPSDH), but also less extensible (~53% for TPS and ~78% for TPSDH). The incorporation of CMFs into the TPS matrix at the highest contents also promoted a decrease in water vapor (~15%) and oxygen permeabilities (~30%). Finally, all the TPS composite films showed low changes in terms of optical properties and equilibrium moisture, being less soluble in water than the TPSDH films. [ABSTRACT FROM AUTHOR]

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المؤلفون: de Oliveira, Taíla V.¹ taveloso@icloud.com, de Freitas, Pedro A. V.¹ pedroafreitas3@gmail.com, Pola, Cicero C.² cicerocp@iastate.edu, Terra, Larissa R.³ larissarochaterra@gmail.com, da Silva, José O. R.¹ joseosvaldobm@gmail.com, Badaró, Amanda T.⁴ tbadaro.amanda@gmail.com, Junior, Nelson S.¹ soaresnelson0@gmail.com, de Oliveira, Marciano M.⁴ oliveira.ealufv@gmail.com, Silva, Rafael R. A.¹ rafaelmega@yahoo.com.br, Soares, Nilda de F. F.¹ nfsoares10@gmail.com

المصدر: Polysaccharides (2673-4176). Sep2021, Vol. 2 Issue 3, p661-676. 16p.

مصطلحات موضوعية: *INTERMOLECULAR interactions, *MALEIC anhydride, *CELLULOSE, *NANOCRYSTALS, *ANTI-infective agents, *POLYVINYL alcohol

مستخلص: On behalf of a circular economy, regular plastics have been replaced by biodegradable packagings. Besides, active films have been applied to improve the shelf-life and quality of foods. In this work, blends were developed using starch as a low-cost natural polymer, mixed with poly(vinyl alcohol) due to its physical-chemical and biodegradable properties. Moreover, maleic anhydride (MaAh), cellulose-nanocrystal (CN), and nisin-z (N-Z) were added, respectively, as a compatibilizer, a mechanical-reinforce, and antimicrobial agents. The thermal stability of the films was analyzed, which blends' melting temperature occurred around 200-207 °C, and it was influenced by CN, N-Z, and MaAh amounts. N-Z and MaAh acted against S. aureus and P. aeruginosa by compound diffusion (inhibition-halo around 1.85 and 2.18 cm); while S. Choleraesuis and E. coli were inhibited by contact. Therefore, these blends presented the potential to be used as active biodegradable packaging in the food industry. [ABSTRACT FROM AUTHOR]

المؤلفون: FREITAS, PEDRO A. V., SILVA, RAFAEL R. A., DE OLIVEIRA, TAÍLA V., SOARES, RAQUEL R. A., SOARES, NILDA F. F.

المصدر: International Journal of Food Studies; Oct2020, p360-372, 13p

مصطلحات موضوعية: MOZZARELLA cheese, FOOD preservation, NISIN, FOOD packaging, LISTERIA innocua, EDIBLE coatings, STAPHYLOCOCCUS aureus

مستخلص: Currently, improvement of food preservation has been a substantial challenge for industries to increase shelf-life of products and to maintain food quality during storage. These goals are often tied to the sustainable tendency for use of eco-friendly packaging to store these products without loss of the packaging features. Therefore, the aim of this study was to produce biodegradable antimicrobial films by the incorporation of nisin Z peptide under different concentrations (0 %, 5 %, 10 %, 15 % and 20 % wt.) into hydroxypropylmethylcellulose (HPMC) matrices. The active film properties were evaluated in terms of their antimicrobial capacity in vitro, mechanical performance and microscopic characteristics. Hence, active films containing 10 % (wt.) of nisin Z and control films were placed in contact with sliced mozzarella cheese for eight days, and microbiological growth was monitored during storage. Nisin Z's antimicrobial effects were observed against the Gram-positive microorganisms such as Staphylococcus aureus and Listeria innocua, regardless if the compound was free as a suspension or incorporated into HPMC matrices. However, the expected low action of nisin Z against Gram-negative bacteria, as reported in literature, was not observed since Salmonella enterica Choleraesuis's growth was inhibited. Moreover, active films with added nisin Z (10 % wt.) were more effective than the control film to inhibit mesophilic microorganisms in mozzarella cheese during 8 days of storage. The mechanical properties of the films were not influenced by nisin Z incorporation, since the addition of the compound enhanced the active function without the loss of mechanical properties required for a good food packaging. These results suggest that biodegradable films produced by nisin Z addition into HPMC matrix are an excellent biomaterial for mozzarella cheese preservation. [ABSTRACT FROM AUTHOR]

: Copyright of International Journal of Food Studies is the property of ISEKI Food Association and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Freitas, Pedro A. V., González-Martínez, Chelo, Chiralt, Amparo

المصدر: Foods; Nov2020, Vol. 9 Issue 11, p1657, 1p

مصطلحات موضوعية: RICE straw, BIOACTIVE compounds, AGRICULTURAL wastes, LISTERIA innocua, HYDROPHILIC compounds, GALLIC acid, PLANT phenols

مستخلص: The extraction of water-soluble bioactive compounds using different green methods is an eco-friendly alternative for valorizing agricultural wastes such as rice straw (RS). In this study, aqueous extracts of RS (particles < 500 µm) were obtained using ultrasound (US), reflux heating (HT), stirring (ST) and a combination of US and ST (USST) or HT (USHT). The extraction kinetics was well fitted to a pseudo-second order model. As regards phenolic compound yield, the US method (342 mg gallic acid (GAE). 100 g⁻¹ RS) was more effective than the ST treatment (256 mg GAE·100 g⁻¹ RS), reaching an asymptotic value after 30 min of process. When combined with HT (USHT), the US pre-treatment led to the highest extraction of phenolic compounds from RS (486 mg GAE·100 g⁻¹ RS) while the extract exhibited the greatest antioxidant activity. Furthermore, the USHT extract reduced the initial counts of Listeria innocua by 1.7 logarithmic cycles. Therefore, the thermal aqueous extraction of RS applying the 30 min US pre-treatment, represents a green and efficient approach to obtain bioactive extracts for food applications. [ABSTRACT FROM AUTHOR]

: Copyright of Foods is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)