Search results for " Thermal treatment"

showing 10 items of 11 documents

Impact of conventional and non-conventional processing on prickly pear ( Opuntia spp.) and their derived products: From preservation of beverages to …

2017

Abstract Background In recent years, both food researchers and food industry have shown growing interest in Opuntia fruits, as they constitute a good source of phytochemicals such as phenolics, vitamin C, vitamin E, polysaccharides and betalains. Many of these compounds have shown antioxidant, anti-cancer, antiatherosclerotic and/or hepatoprotective properties. Moreover, the fruit is also a source of dietary fibers, which promote bowel transit, thus preventing constipation. Scope and approach Due to these properties, Opuntia fruits are considered as functional products offering numerous health benefits when are consumed as fresh or processed product. However, these compounds can lose their …

Food preservationNon-conventional processing2. Zero hungerPEARglucosinolates ; isothiocyanates ; bioavailability ; assisted extraction ; non-conventional processing ; thermal treatment[SDV.BIO]Life Sciences [q-bio]/BiotechnologyFood industrybusiness.industryChemistry[SDV]Life Sciences [q-bio]Food preservationOpuntia04 agricultural and veterinary sciencesHealth benefits040401 food sciencePascalization0404 agricultural biotechnologyExtraction of valuable compoundsThermal treatment[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process EngineeringFood sciencebusiness[SDV.AEN]Life Sciences [q-bio]/Food and NutritionFood ScienceBiotechnologyTrends in Food Science & Technology
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High Pressure Processing Impact on Emerging Mycotoxins (ENNA, ENNA1, ENNB, ENNB1) Mitigation in Different Juice and Juice-Milk Matrices

2022

The aim of the present study was to investigate the potential of high-pressure processing (HPP) (600 MPa during 5 min) on emerging mycotoxins, enniatin A (ENNA), enniatin A1 (ENNA1), enniatin B (ENNB), enniatin B1 (ENNB1) reduction in different juice/milk models, and to compare it with the effect of a traditional thermal treatment (HT) (90 °C during 21 s). For this purpose, different juice models (orange juice, orange juice/milk beverage, strawberry juice, strawberry juice/milk beverage, grape juice and grape juice/milk beverage) were prepared and spiked individually with ENNA, ENNA1, ENNB and ENNB1 at a concentration of 100 µg/L. After HPP and HT treatments, ENNs were extracted from treate…

Health (social science)Chemical technologyTP1-1185Plant Sciencehigh pressure processingHealth Professions (miscellaneous)MicrobiologyAliments AnàlisiArticleliquid chromatography coupled to ion-trap tandem mass spectrometry (HPLC-MS/MS-IT)enniatinsFongsjuice modelsdispersive liquid-liquid microextraction methodology (DLLME)high pressure processing; thermal treatment; enniatins; juice models; dispersive liquid-liquid microextraction methodology (DLLME); liquid chromatography coupled to ion-trap tandem mass spectrometry (HPLC-MS/MS-IT)thermal treatmentFood ScienceFoods
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Thermally induced doping in controlled atmosphere on Graphene

2017

Since its experimental breakthrough discovery in 2004, Graphene (Gr) paved the way for the study of the "flatland" of two dimensional (2D) materials. These systems are an emerging topic of interest in solid state physics and amterial sciences, but nont only, and today count a family of monoatomic layer of C atoms in hexgonal honey comb crystalline structure.

Settore FIS/01 - Fisica SperimentaleGraphene thermal treatments doping raman spectroscopy
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Effects of thermal treatments in controlled atmosphere on the Ce oxidation state in Ce-Ti-Eu doped SiO2 sol-gel glasses

2011

We report an experimental study by optical absorption, photoluminescence and Raman spectroscopies of the modifications induced on Ce–Ti-Eu doped SiO2 glasses by thermal treatments in controlled atmosphere. Samples with Ce content varying up to 5,000 part per million by weight (ppm) and with Ti and Eu content fixed at 40 and 300 ppm respectively, have been investigated. The treatments were done in inert atmosphere of He and in O2 atmosphere at 390 C and 100 bar. Our experiments show that only Ce4? ions are affected by He treatments, whereas both Ce4? and Ce3? ions are affected by O2 treatments. The obtained results are interpreted on the basis of microstructural changes induced by the therma…

Settore FIS/01 - Fisica SperimentaleSilica optical properties thermal treatments
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EXTENDED VALIDATION OF DYNAMIC IRREVERSIBLE THERMOPORATION: A NOVEL THERMAL PROCESS FOR MICROBIAL INACTIVATION

2017

A novel thermal treatment for microorganism inactivation, characterized by a very rapid temperature increase (up to 30C/s) and a low final temperature (up to 65C) maintained for a relatively short holding time, has been recently presented and tested by the authors, showing microbial load reduction greater than 5 log units against several common bacteria and yeasts. With the aim of extending the possible use of the new thermal treatment to a wider microorganisms class, in this work the dynamic irreversible thermoporation (DIT) treatment was further tested on a well-known thermoresistant strain, the Enterococcus hirae: The results of these new experimental tests confirmed the reliability of t…

Settore ING-IND/08 - Macchine A FluidoSettore MED/42 - Igiene Generale E ApplicataSettore ING-IND/13 - Meccanica Applicata Alle MacchineMicroorganisms inactivation thermal treatment beverages Enterococcus hirae SEM analysis
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Effect of a physical pre-treatment and drying on carotenoids of goji berries ( Lycium barbarum L.)

2018

In order to evaluate the influence of an abrasive pre-treatment and drying at 50 °C, 60 °C, 70 °C of goji fruits (Lycium barbarum L.), changes in colour and carotenoids were studied. An extraction method was modified and adapted to assay the main carotenoid esters and saponified carotenoids of goji berries, before and after treatments. Goji berries were confirmed as a high source of zeaxanthin, with zeaxanthin-dipalmitate at about 2 g/kg dry weight. The reliability of the analytical method was confirmed by the high quantitative recoveries, about 100%, a higher repeatability than reference methods and a good reproducibility (lower than 5%). After drying, significant but small carotenoid loss…

Zeaxanthin-dipalmitateAbrasive pre-treatment Colour Lycium barbarum L. Thermal treatment Zeaxanthin-dipalmitateColourchemistry.chemical_compound0404 agricultural biotechnologyfoodAbrasive pre-treatmentDry weightThermal treatmentFood scienceCarotenoidchemistry.chemical_classificationLycium barbarum LbiologyGoji berryAbrasive pre-treatment; Colour; Lycium barbarum L.; Thermal treatment; Zeaxanthin-dipalmitate; Food Sciencefood and beveragesSettore AGR/15 - Scienze E Tecnologie Alimentari04 agricultural and veterinary sciencesRepeatabilityAbrasive pre-treatment Colour Lycium barbarum L. Thermal treatment Zeaxanthin-dipalmitatebiology.organism_classification040401 food sciencefood.foodZeaxanthinchemistryXanthophyllLyciumSaponificationFood Science
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Graphene oxide and Fumed silica graphene oxide nanocomposites modification by thermal treatments

2014

In the present study we investigate post synthesis thermal treatments up to 400 °C of graphene oxide (GrO) prepared from commercial graphite and of GrO–silica nanocomposites prepared by a solution of commercial Fumed silica nanoparticles (average diameter 7 nm or 40 nm) and the GrO. The thermal treatments were carried out in air, vacuum or He atmosphere to highlight tunable changes. Two GrO batches with small differences in the D (~1350 cm–1) and G (~1580 cm–1) Raman bands have been employed to evaluate effects depending on preparation. Thermal effects have been monitored through the Raman spectroscopy focusing on D, G and 2D (2500–3500 cm–1) bands spectral ranges. The experiments evidenced…

graphene oxide nanosilica nanocomposites thermal treatments Raman spectroscopySettore FIS/01 - Fisica Sperimentale
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IMPROVED STABILITY OF GRAPHENE OXIDE-SILICA NANOHYBRIDS AND RELATED POLYMER-BASED NANOCOMPOSITES

2014

Although its promising properties make the graphene oxide (GO) very interesting as filler for polymer matrices, some problems related to its thermal stability in the region which ranges from 80 to 200 °C, are crucial for the possibility to melt process GO together with practically all the polymers [1,2]. Moreover, above 100 °C GO lamellae were found to become stacked. In this work, two different ways to preserve the GO structure and ensure its dispersion within different polymer matrices have been investigated and schematized in Fig. 1. Exfoliation plays a key-role in the achievement of good mechanical properties since it preserves the GO from both stacking phenomena. The capability of sili…

graphene oxide nanosilica nanohybrids thermal treatment melt processing.
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Growth of beryllium oxide nano-structures during thermal treatment of neutron irradiated beryllium

2015

Beryllium oxide nano-structures grown during high temperature oxidation of neutron irradiated beryllium has been investigated. Oxidation of non - irradiated and neutron irradiated beryllium was performed in differential thermal analyzer in an atmosphere of air and its mixture with helium at temperatures up to 1050°C. Structure of beryllium and its oxide was studied by the means of scanning electron microscopy. The growth of beryllium oxide nano-structures – “labyrinth type” layers and nano-rods on the inner surfaces of neutron irradiated beryllium were observed by means of Scanning Electron Microscopy. The size of the rods was 10-100 nm in diameter and up to few micrometers in length. There…

lcsh:TN1-997Materials scienceBeryllium oxideScanning electron microscopeRadiochemistrytechnology industry and agricultureOxidechemistry.chemical_elementThermal treatmentrespiratory tract diseaseschemistry.chemical_compoundchemistryberyllium beryllium oxide neutron irradiation thermal treatment nano structureGeneral Materials ScienceNeutronIrradiationBerylliumlcsh:Mining engineering. MetallurgyHeliumMaterials Science
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