Design of a batch ultrasonic reactor for rapid pasteurization of juices

Publication date: Available online 19 September 2019Source: Journal of Food EngineeringAuthor(s): Zahra Moaddabdoost Baboli, Leonard Williams, Guibing ChenAbstractJuices are usually thermally pasteurized, but high temperatures negatively affect their nutritional and sensory qualities. For this reason, nonthermal pasteurization techniques with little or no heat applied have been developed to minimize the quality losses. Among them, high-intensity ultrasound has been considered as a promising technique for juice pasteurization. Despite the extensive studies, a long pasteurization time is needed to achieve the required 5-log microbial reduction when a liquid is ultrasonically processed in an existing typical ultrasonic reactor, while inactivating some bacteria with a high tolerance to ultrasound is still a challenge. This is because there exist passive zones in the reactor as revealed by numerical simulations using COMSOL Multiphysics. This problem was successfully resolved by developing a new batch ultrasonic reactor which delivered almost uniform high intensity ultrasound throughout the reactor during processing, and therefore, substantially shortened the pasteurization time. Using this reactor to inactivate Escherichia coli at 60 °C and Staphylococcus aureus at 62 °C in peptone water, a 5-log microbial reduction was achieved in 0.38 min and 0.55 min, respectively. This was the first reported study that reached a 5-log reduction of S. aureus using ultrasonic processing...
Source: Journal of Food Engineering - Category: Food Science Source Type: research

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Publication date: 15 December 2019Source: Journal of Molecular Liquids, Volume 296Author(s): Subramanian Siva, Changzhu Li, Haiying Cui, Lin LinAbstractIsoeugenol is a natural dual antioxidant/prooxidant. In this research, the inclusion complex (IC) of isoeugenol with 2-hydroxypropyl-β-cyclodextrin (HPβCD) was prepared via the ultrasound (US) method. The US assisted isoeugenol/HPβCD-IC was investigated by various characterization techniques such as UV–Vis absorption, fluorescence, powder X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravimetric analysis and differential scanning c...
Source: Journal of Molecular Liquids - Category: Molecular Biology Source Type: research
Abstract Efficiency of blue (462 ± 3 nm) light emitting diode (LED) illumination to inactivate Escherichia coli and Staphylococcus aureus in the presence of exogenous photosensitizer (curcumin) was studied in freshly squeezed orange juice. Further, the combinational effect of ultrasound (US), photosensitizer (PS) and blue light (BL) on inactivation of microbes was evaluated. The effect of process parameters such as concentration of PS, US and volume of the juice on E. coli and S. aureus inactivation was also investigated. The US alone and PS + BL treatments resulted in 3.02 ± 0.52 and 1...
Source: Ultrasonics Sonochemistry - Category: Chemistry Authors: Tags: Ultrason Sonochem Source Type: research
In this study, ultrasound-assisted green synthesis method was utilized for the preparation of Fe3O4 NPs with novel shape (dendrimer) through leaf aqueous extract of Artemisia haussknechtii Boiss. Ultraviolet-visible spectroscopy, energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), atomic force microscopic (AFM), X-ray diffraction (XRD) techniques were applied for MNPs physicochemical characterization. Also, disc diffusion assay, minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), planktonic and biofilm morphology of t...
Source: Artificial Cells, Nanomedicine and Biotechnology - Category: Biotechnology Tags: Artif Cells Nanomed Biotechnol Source Type: research
Abstract In this paper, a simple and environment friendly approach was used to prepare the multifunctional composite fabrics via coating commercial TiO2 nanoparticles (NPs) on the surface of cotton fibers by surface micro-dissolution process in 55%wt ZnCl2 aqueous solution under the aid of ultrasound without any adhesive. The TiO2/cotton composite fabrics were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and thermal gravity (TG) methods. The treated fabric had photocatalytic property in Rhoda...
Source: Ultrasonics Sonochemistry - Category: Chemistry Authors: Tags: Ultrason Sonochem Source Type: research
In this study, the inclusion complex of cuminaldehyde (CUM), a major constituent of cumin essential oil, with 2-hydroxypropyl-β-cyclodextrin (HPβCD) was synthesised with the aid of ultrasound. The solid CUM/HPβCD-IC was characterized using Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (PXRD), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) techniques. The stability constants were evaluated by phase solubility, absorption and fluorimetry methods, and were found to be 168, 122 and 256 M-1, respectively. FT-IR and molecular modeling studies indicated ...
Source: Ultrasonics Sonochemistry - Category: Chemistry Authors: Tags: Ultrason Sonochem Source Type: research
Publication date: Available online 17 April 2019Source: Materials Science and Engineering: CAuthor(s): Diego Omar Sanchez Ramirez, Alessio Varesano, Riccardo Andrea Carletto, Claudia Vineis, Ilana Perelshtein, Michal Natan, Nina Perkas, Ehud Banin, Aharon GedankenAbstractAntimicrobial textiles can contribute to the fighting against antibiotic resistance pathogenic microorganisms. Polypyrrole is a conjugated polymer that exerts a biocidal action thanks to positive charges on its backbone chain produced during it synthesis. In this work, dispersions of stable polypyrrole nanoparticles were produced by chemical oxidative poly...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
In this study, eight phages were sequentially separated from sewage (Table 2). Phages vB_EcoS_IME18 (IME18), vB_EcoS_IME253 (IME253), vB_EcoM_IME281 (IME281), vB_EcoM_IME338 (IME338), vB_EcoM_IME339 (IME339), vB_EcoM_IME340 (IME340), vB_EcoM_IME341 (IME341), and vB_EcoS_IME347 (IME347) formed clear, bright plaques on soft agar plates (Supplementary Figure S2). TEM imaging showed that phages IME281 (Figure 1), IME339 (Figure 2), IME340 (Figure 3), and IME341 (Figure 4) had a prolate head and a tail with a contractile sheath. The elongated icosahedral head was ∼100 nm long and 80 nm wide, while the tail tube was ∼100...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Guangwen Luo1†, Bailiang Li1†, Cailu Yang2†, Yutang Wang1, Xin Bian1, Wan Li1, Fei Liu1 and Guicheng Huo1* 1Key Laboratory of Dairy Science, Ministry of Education, College of Food Science, Northeast Agricultural University, Harbin, China 2Department of Ultrasound, Maternal and Child Health Hospital of Dapeng New District, Shenzhen, China Modulating gut microbiota to promote host health is well recognized. Therefore, people consume dietary products containing traditional probiotics in wishing to improve their health, and they need more research-based advices on how to select products with sui...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
This study evaluates the effectiveness of the MTS system in the inactivation of two opposite gram-stained bacteria: E. coli ATCC 25922 and S. aureus ATCC 25923. Samples were treated with different conditions, including mild heat (T, 50 °C, 100 kPa), sonication (US, 30 °C, 100 kPa), thermosonication (TS, 50 °C, 100 kPa), manosonication (MS, 30 °C, 400 kPa), and manothermosonication (MTS, 50 °C, 400 kPa) in pulse mode for precise temperature control. After 5 min, the viability of E. coli and S. aureus treated with MTS decreased by 6.25 and 4.55 log CFU/mL, and the maximum decrease in non-linear Biphasic d...
Source: Journal of Food Engineering - Category: Food Science Source Type: research
Publication date: 25 September 2018Source: Journal of Industrial and Engineering Chemistry, Volume 65Author(s): Fardin Sadeghfar, Mehrorang Ghaedi, Arash Asfaram, Ramin Jannesar, Hamedreza Javadian, Vahid PezeshkpourAbstractIn this research study, the polyvinyl alcohol/Fe3O4@carbon nanotubes (PVA/Fe3O4@CNTs) nanocomposite was prepared by electrochemical-assisted synthesis method, characterized by FT-IR, UV–vis, FE-SEM, TEM, BET and XRD techniques, and subsequently applied for the ultrasound-assisted removal of methylene blue (MB) dye from aqueous solution and as antibacterial agent in vitro investigation against Prot...
Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research
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