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Janahar JJ, Xu J, Balasubramaniam V, Yousef A, Ting E. Inactivation of Lactobacillus brevis cells and Bacillus cereus spores as influenced by pressure, shear, thermal, and valve geometry. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2023. [DOI: 10.1080/10942912.2023.2173227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Affiliation(s)
- Jerish Joyner Janahar
- Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA
| | - Jie Xu
- Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA
| | - V.M. Balasubramaniam
- Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA
- Department of Food Agricultural and Biological Engineering, The Ohio State University, Columbus, OH, USA
| | - Ahmed Yousef
- Department of Food Science and Technology, The Ohio State University, Columbus, OH, USA
| | - Edmund Ting
- Pressure BioSciences Inc, South Easton, MA, USA
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Bevilacqua A, Petruzzi L, Speranza B, Campaniello D, Ciuffreda E, Altieri C, Sinigaglia M, Corbo MR. Viability, Sublethal Injury, and Release of Cellular Components From Alicyclobacillus acidoterrestris Spores and Cells After the Application of Physical Treatments, Natural Extracts, or Their Components. Front Nutr 2021; 8:700500. [PMID: 34458303 PMCID: PMC8385314 DOI: 10.3389/fnut.2021.700500] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 07/12/2021] [Indexed: 12/04/2022] Open
Abstract
Alicyclobacillus acidoterrestris is a spoiling microorganism regarded as one of the most important causes of spoilage of fruit juices and acidic products. In this paper, four strains of A. acidoterrestris (type strain-DSM 3922; two wild strains isolated from soil-C8 and C24; wild strain isolated from a spoiled pear juice CB1) were treated through natural extracts/active compounds from essential oils (EOs), and physical treatments were used to assess their susceptibility and the presence of sublethal injury. The characterization of damage was also performed. The results suggest that it is possible to control A. acidoterrestris through alternative approaches, although the effect relied upon the age of spores. In addition to the mere antimicrobial effect, some treatments could cause a sublethal injury on spores. Lemon extract was the most effective treatment for both the antimicrobial effect and the sublethal injury, as evidenced by the release of proteins, and calcium dipicolinate [dipicolinic acid (DPA)] by fresh spores and only DPA (with an exception for C8) by old spores. A sublethal injury with protein release was also found for physical treatments [US (ultrasound) or heating]. For the first time, this paper reports on the existence of a sublethal injury for A. acidoterrestris, and this evidence could also be a challenge, because injured microorganisms could restore their metabolism, or an opportunity to design new preserving treatments.
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Affiliation(s)
- Antonio Bevilacqua
- Department of Agriculture, Food, Natural Resources and Engineering, University of Foggia, Foggia, Italy
| | | | | | | | | | | | | | - Maria Rosaria Corbo
- Department of Agriculture, Food, Natural Resources and Engineering, University of Foggia, Foggia, Italy
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Bevilacqua A, Petruzzi L, Sinigaglia M, Speranza B, Campaniello D, Ciuffreda E, Corbo MR. Effect of Physical and Chemical Treatments on Viability, Sub-Lethal Injury, and Release of Cellular Components from Bacillus clausii and Bacillus coagulans Spores and Cells. Foods 2020; 9:E1814. [PMID: 33297479 PMCID: PMC7762378 DOI: 10.3390/foods9121814] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/26/2020] [Accepted: 12/05/2020] [Indexed: 01/09/2023] Open
Abstract
Bacterial spores are of concern to the food industry due to their ability to survive processing and their potential to subsequently germinate and grow in food. In this paper, two strains belonging to the genus Bacillus (B. clausii DSM 8716 and B. coagulans DSM 1) were studied under in vitro conditions after the application of essential oils, and physical treatments; cells and spores' susceptibility, the extent of sub-lethal injury and the release of cellular components as a function of treatment and targets (cells, spores, old or activated spores) were studied. The highest antimicrobial effect was found for cells treated through citrus extract, while both essential oils and physical treatments could cause a sub-lethal injury on the surviving cells and spores; in addition, the spores of B. coagulans released dipicolinic acid (DPA) and proteins. Sub-lethal injury should be considered when designing a food processing treatment, because injured microorganisms could either repair the damage or be inactivated with a different effect on microbial stability of foods.
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Affiliation(s)
- Antonio Bevilacqua
- Department of Agriculture, Food, Natural Resources and Engineering (DAFNE), University of Foggia, 71122 Foggia, Italy; (L.P.); (M.S.); (B.S.); (D.C.); (E.C.); (M.R.C.)
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Bevilacqua A, Campaniello D, Speranza B, Altieri C, Sinigaglia M, Corbo MR. Two Nonthermal Technologies for Food Safety and Quality-Ultrasound and High Pressure Homogenization: Effects on Microorganisms, Advances, and Possibilities: A Review. J Food Prot 2019; 82:2049-2064. [PMID: 31702965 DOI: 10.4315/0362-028x.jfp-19-059] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Some nonthermal technologies have gained special interest as alternative approaches to thermal treatments. High pressure homogenization (HPH) and ultrasound (US) are two of the most promising approaches. They rely upon two different modes of action, although they share some mechanisms or ways of actions (mechanic burden against cells, cavitation and micronization, primary targets being the cell wall and the membrane, temperature and pressure playing important roles for their antimicrobial potential, and their effect on cells can be either positive or negative). HPH is generally used in milk and dairy products to break lipid micelles, whereas US is used for mixing and/or to obtain active compounds of food. HPH and US have been tested on pathogens and spoilers with different effects; thus, the main goal of this article is to describe how US and HPH act on biological systems, with a focus on antimicrobial activity, mode of action, positive effects, and equipment. The article is composed of three main parts: (i) an overview of US and HPH, with a focus on some results covered by other reviews (mode of action toward microorganisms and effect on enzymes) and some new data (positive effect and modulation of metabolism); (ii) a tentative approach for a comparative resistance of microorganisms; and (iii) future perspectives.
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Affiliation(s)
- Antonio Bevilacqua
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
| | - Daniela Campaniello
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
| | - Barbara Speranza
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
| | - Clelia Altieri
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
| | - Milena Sinigaglia
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
| | - Maria Rosaria Corbo
- Department of the Science of Agriculture, Food and Environment, University of Foggia, Foggia, Italy
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Abstract
High pressure homogenization (HPH) is an emerging technology with several possible applications in the food sector, such as nanoemulsion preparation, microbial and enzymatic inactivation, cell disruption for the extraction of intracellular components, as well as modification of food biopolymer structures to steer their functionalities. All these effects are attributable to the intense mechanical stresses, such as cavitation and shear forces, suffered by the product during the passage through the homogenization valve. The exploitation of the disruptive forces delivered during HPH was also recently proposed for winemaking applications. In this review, after a general description of HPH and its main applications in food processing, the survey is extended to the use of this technology for the production of wine and fermented beverages, particularly focusing on the effects of HPH on the inactivation of wine microorganisms and the induction of yeast autolysis. Further enological applications of HPH technology, such as its use for the production of inactive dry yeast preparations, are also discussed.
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Reverter-Carrión L, Sauceda-Gálvez J, Codina-Torrella I, Hernández-Herrero M, Gervilla R, Roig-Sagués A. Inactivation study of Bacillus subtilis, Geobacillus stearothermophilus, Alicyclobacillus acidoterrestris and Aspergillus niger spores under Ultra-High Pressure Homogenization, UV-C light and their combination. INNOV FOOD SCI EMERG 2018. [DOI: 10.1016/j.ifset.2018.06.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lopes RP, Mota MJ, Gomes AM, Delgadillo I, Saraiva JA. Application of High Pressure with Homogenization, Temperature, Carbon Dioxide, and Cold Plasma for the Inactivation of Bacterial Spores: A Review. Compr Rev Food Sci Food Saf 2018; 17:532-555. [PMID: 33350128 DOI: 10.1111/1541-4337.12311] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 08/29/2017] [Accepted: 09/01/2017] [Indexed: 12/18/2022]
Abstract
Formation of highly resistant spores is a concern for the safety of low-acid foods as they are a perfect vehicle for food spoilage and/or human infection. For spore inactivation, the strategy usually applied in the food industry is the intensification of traditional preservation methods to sterilization levels, which is often accompanied by decreases of nutritional and sensory properties. In order to overcome these unwanted side effects in food products, novel and emerging sterilization technologies are being developed, such as pressure-assisted thermal sterilization, high-pressure carbon dioxide, high-pressure homogenization, and cold plasma. In this review, the application of these emergent technologies is discussed, in order to understand the effects on bacterial spores and their inactivation and thus ensure food safety of low-acid foods. In general, the application of these novel technologies for inactivating spores is showing promising results. However, it is important to note that each technique has specific features that can be more suitable for a particular type of product. Thus, the most appropriate sterilization method for each product (and target microorganisms) should be assessed and carefully selected.
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Affiliation(s)
- Rita P Lopes
- QOPNA, Chemistry Dept., Univ. of Aveiro, Campus Univ. de Santiago, 3810-193 Aveiro, Portugal
| | - Maria J Mota
- QOPNA, Chemistry Dept., Univ. of Aveiro, Campus Univ. de Santiago, 3810-193 Aveiro, Portugal
| | - Ana M Gomes
- Escola Superior de Biotecnologia, Univ. Católica Portuguesa, 4200-072 Porto, Portugal
| | - Ivonne Delgadillo
- QOPNA, Chemistry Dept., Univ. of Aveiro, Campus Univ. de Santiago, 3810-193 Aveiro, Portugal
| | - Jorge A Saraiva
- QOPNA, Chemistry Dept., Univ. of Aveiro, Campus Univ. de Santiago, 3810-193 Aveiro, Portugal
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Patrignani F, Lanciotti R. Applications of High and Ultra High Pressure Homogenization for Food Safety. Front Microbiol 2016; 7:1132. [PMID: 27536270 PMCID: PMC4971028 DOI: 10.3389/fmicb.2016.01132] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 07/07/2016] [Indexed: 12/17/2022] Open
Abstract
Traditionally, the shelf-life and safety of foods have been achieved by thermal processing. Low temperature long time and high temperature short time treatments are the most commonly used hurdles for the pasteurization of fluid foods and raw materials. However, the thermal treatments can reduce the product quality and freshness. Consequently, some non-thermal pasteurization process have been proposed during the last decades, including high hydrostatic pressure, pulsed electric field, ultrasound (US), and high pressure homogenization (HPH). This last technique has been demonstrated to have a great potential to provide “fresh-like” products with prolonged shelf-life. Moreover, the recent developments in high-pressure-homogenization technology and the design of new homogenization valves able to withstand pressures up to 350–400 MPa have opened new opportunities to homogenization processing in the food industries and, consequently, permitted the development of new products differentiated from traditional ones by sensory and structural characteristics or functional properties. For this, this review deals with the principal mechanisms of action of HPH against microorganisms of food concern in relation to the adopted homogenizer and process parameters. In addition, the effects of homogenization on foodborne pathogenic species inactivation in relation to the food matrix and food chemico-physical and process variables will be reviewed. Also the combined use of this alternative technology with other non-thermal technologies will be considered.
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Affiliation(s)
- Francesca Patrignani
- Department of Agricultural and Food Sciences, University of Bologna Bologna, Italy
| | - Rosalba Lanciotti
- Department of Agricultural and Food Sciences, University of Bologna Bologna, Italy
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Roig-Sagués A, Asto E, Engers I, Hernández-Herrero M. Improving the efficiency of ultra-high pressure homogenization treatments to inactivate spores of Alicyclobacillus spp. in orange juice controlling the inlet temperature. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2015.04.056] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bevilacqua A, Ciuffreda E, Sinigaglia M, Corbo MR. Spore inactivation and DPA release in Alicyclobacillus acidoterrestris under different stress conditions. Food Microbiol 2014; 46:299-306. [PMID: 25475299 DOI: 10.1016/j.fm.2014.08.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Revised: 07/22/2014] [Accepted: 08/21/2014] [Indexed: 11/26/2022]
Abstract
This paper reports on the inactivation of spores of 5 strains of Alicyclobacillus acidoterrestris under different stress conditions (acidic and alkaline pH, high temperature, addition of lysozyme, hydrogen peroxide and p-coumaric acid). The research was divided into two different steps; first, each stress was studied alone, thus pointing out a partial uncoupling between spore inactivation and DPA release, as H2O2 reduced spore level below the detection but it did not cause the release of DPA. A partial correlation was found only for acidic and alkaline pH. 2nd step was focused on the combination of pH, temperature and H2O2 through a factorial design; experiments were performed on both fresh and 4 month-old spores and pinpointed a different trend for DPA release as a function of spore age.
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Affiliation(s)
- Antonio Bevilacqua
- Department of the Science of Agriculture, Food and Environment (SAFE), University of Foggia, Via Napoli 25, 71122, Foggia, Italy
| | - Emanuela Ciuffreda
- Department of the Science of Agriculture, Food and Environment (SAFE), University of Foggia, Via Napoli 25, 71122, Foggia, Italy
| | - Milena Sinigaglia
- Department of the Science of Agriculture, Food and Environment (SAFE), University of Foggia, Via Napoli 25, 71122, Foggia, Italy
| | - Maria Rosaria Corbo
- Department of the Science of Agriculture, Food and Environment (SAFE), University of Foggia, Via Napoli 25, 71122, Foggia, Italy.
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Georget E, Miller B, Aganovic K, Callanan M, Heinz V, Mathys A. Bacterial spore inactivation by ultra-high pressure homogenization. INNOV FOOD SCI EMERG 2014. [DOI: 10.1016/j.ifset.2014.08.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Georget E, Miller B, Callanan M, Heinz V, Mathys A. (Ultra) high pressure homogenization for continuous high pressure sterilization of pumpable foods - a review. Front Nutr 2014; 1:15. [PMID: 25988118 PMCID: PMC4428391 DOI: 10.3389/fnut.2014.00015] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 08/01/2014] [Indexed: 11/29/2022] Open
Abstract
Bacterial spores have a strong resistance to both chemical and physical hurdles and create a risk for the food industry, which has been tackled by applying high thermal intensity treatments to sterilize food. These strong thermal treatments lead to a reduction of the organoleptic and nutritional properties of food and alternatives are actively searched for. Innovative hurdles offer an alternative to inactivate bacterial spores. In particular, recent technological developments have enabled a new generation of high pressure homogenizer working at pressures up to 400 MPa and thus, opening new opportunities for high pressure sterilization of foods. In this short review, we summarize the work conducted on (ultra) high pressure homogenization (U)HPH to inactivate endospores in model and food systems. Specific attention is given to process parameters (pressure, inlet, and valve temperatures). This review gathers the current state of the art and underlines the potential of UHPH sterilization of pumpable foods while highlighting the needs for future work.
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Affiliation(s)
- Erika Georget
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
- Institute of Food Chemistry, Leibniz University of Hanover, Hanover, Germany
| | - Brittany Miller
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
| | | | - Volker Heinz
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
| | - Alexander Mathys
- German Institute of Food Technologies (DIL), Quakenbrueck, Germany
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Tyagi AK, Gottardi D, Malik A, Guerzoni ME. Chemical composition, in vitro anti-yeast activity and fruit juice preservation potential of lemon grass oil. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2014.02.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Dumay E, Chevalier-Lucia D, Picart-Palmade L, Benzaria A, Gràcia-Julià A, Blayo C. Technological aspects and potential applications of (ultra) high-pressure homogenisation. Trends Food Sci Technol 2013. [DOI: 10.1016/j.tifs.2012.03.005] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Tribst AAL, Cristianini M. Changes in commercial glucose oxidase activity by high pressure homogenization. INNOV FOOD SCI EMERG 2012. [DOI: 10.1016/j.ifset.2012.08.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Guglielmotti DM, Patrignani F, Lanciotti R, Guerzoni ME, Reinheimer JA, Quiberoni A. High pressure homogenization versus heat treatment: effect on survival, growth, and metabolism of dairy Leuconostoc strains. J Food Prot 2012; 75:1634-41. [PMID: 22947471 DOI: 10.4315/0362-028x.jfp-12-013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The effect of high pressure homogenization (HPH) with respect to a traditional heat treatment on the inactivation, growth at 8°C after treatments, and volatile profile of adventitious Leuconostoc strains isolated from Cremoso Argentino spoiled cheeses and ingredients used for their manufacture was evaluated. Most Leuconostoc strains revealed elevated resistance to HPH (eight passes, 100 MPa), especially when resuspended in skim milk. Heat treatment was more efficient than HPH in inactivating Leuconostoc cells at the three initial levels tested. The levels of alcohols and sulfur compounds increased during incubation at 8°C in HPH-treated samples, while the highest amounts of aldehydes and ketones characterized were in heated samples. Leuconostoc cells resuspended in skim milk and subjected to one single-pass HPH treatment using an industrial-scale machine showed remarkable reductions in viable cell counts only when 300 and 400 MPa were applied. However, the cell counts of treated samples rose rapidly after only 5 days of storage at 8°C. The Leuconostoc strains tested in this work were highly resistant to the inactivation treatments applied. Neither HPH nor heat treatment assured their total destruction, even though they were more sensitive to the thermal treatment. To enhance the inhibitory effect on Leuconostoc cells, HPH should be combined with a mild heat treatment, which in addition to efficient microbial inactivation, could allow maximal retention of the physicochemical properties of the product.
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Affiliation(s)
- D M Guglielmotti
- Instituto de Lactología Industrial (INLAIN, UNL-CONICET), Facultad de Ingeniería Química, Santiago del Estero 2829, 3000 Santa Fe, Argentina.
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High-Pressure Processing. ACTA ACUST UNITED AC 2012. [DOI: 10.1201/b12088-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Bermúdez-Aguirre D, Dunne CP, Barbosa-Cánovas GV. Effect of processing parameters on inactivation of Bacillus cereus spores in milk using pulsed electric fields. Int Dairy J 2012. [DOI: 10.1016/j.idairyj.2011.11.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Bevilacqua A, Corbo MR, Sinigaglia M. High-pressure homogenisation and benzoate to control Alicyclobacillus acidoterrestris: a possible way? Int J Food Sci Technol 2012. [DOI: 10.1111/j.1365-2621.2011.02913.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhang Y, Zhang P, Ma B, Wu H, Zhang S, Xu X. Sewage sludge disintegration by high-pressure homogenization: a sludge disintegration model. J Environ Sci (China) 2012; 24:814-20. [PMID: 22893956 DOI: 10.1016/s1001-0742(11)60834-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
High-pressure homogenization (HPH) technology was applied as a pretreatment to disintegrate sewage sludge. The effects of homogenization pressure, homogenization cycle number, and total solid content on sludge disintegration were investigated. The sludge disintegration degree (DD(COD)), protein concentration, and polysaccharide concentration increased with the increase of homogenization pressure and homogenization cycle number, and decreased with the increase of sludge total solid (TS) content. The maximum DD(COD) of 43.94% was achieved at 80 MPa with four homogenization cycles for a 9.58 g/L TS sludge sample. A HPH sludge disintegration model of DD(COD) = kNaPb was established by multivariable linear regression to quantify the effects of homogenization parameters. The homogenization cycle exponent a and homogenization pressure exponent b were 0.4763 and 0.7324 respectively, showing that the effect of homogenization pressure (P) was more significant than that of homogenization cycle number (N). The value of the rate constant k decreased with the increase of sludge total solid content. The specific energy consumption increased with the increment of sludge disintegration efficiency. Lower specific energy consumption was required for higher total solid content sludge.
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Affiliation(s)
- Yuxuan Zhang
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China.
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Comparative study of fungal cell disruption--scope and limitations of the methods. Folia Microbiol (Praha) 2011; 56:469-75. [PMID: 21901292 PMCID: PMC3189342 DOI: 10.1007/s12223-011-0069-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 08/29/2011] [Indexed: 11/01/2022]
Abstract
Simple and effective protocols of cell wall disruption were elaborated for tested fungal strains: Penicillium citrinum, Aspergillus fumigatus, Rhodotorula gracilis. Several techniques of cell wall disintegration were studied, including ultrasound disintegration, homogenization in bead mill, application of chemicals of various types, and osmotic shock. The release of proteins from fungal cells and the activity of a cytosolic enzyme, glucose-6-phosphate dehydrogenase, in the crude extracts were assayed to determine and compare the efficacy of each method. The presented studies allowed adjusting the particular method to a particular strain. The mechanical methods of disintegration appeared to be the most effective for the disintegration of yeast, R. gracilis, and filamentous fungi, A. fumigatus and P. citrinum. Ultrasonication and bead milling led to obtaining fungal cell-free extracts containing high concentrations of soluble proteins and active glucose-6-phosphate dehydrogenase systems.
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Tribst AAL, Franchi MA, de Massaguer PR, Cristianini M. Quality of mango nectar processed by high-pressure homogenization with optimized heat treatment. J Food Sci 2011; 76:M106-10. [PMID: 21535772 DOI: 10.1111/j.1750-3841.2010.02006.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
UNLABELLED This work aimed to evaluate the effect of high-pressure homogenization (HPH) with heat shock on Aspergillus niger, vitamin C, and color of mango nectar. The nectar was processed at 200 MPa followed by heat shock, which was optimized by response surface methodology by using mango nectar ratio (45 to 70), heat time (10 to 20), and temperature (60 to 85 °C) as variables. The color of mango nectar and vitamin C retention were evaluated at the optimized treatments, that is, 200 MPa + 61.5 °C/20 min or 73.5 °C/10 min. The mathematical model indicates that heat shock time and temperature showed a positive effect in the mould inactivation, whereas increasing ratio resulted in a protective effect on A. niger. The optimized treatments did not increase the retention of vitamin C, but had positive effect for the nectar color, in particular for samples treated at 200 MPa + 61.5 °C/20 min. PRACTICAL APPLICATION The results obtained in this study show that the conidia can be inactivated by applying HPH with heat shock, particularly to apply HPH as an option to pasteurize fruit nectar for industries.
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Affiliation(s)
- Alline Artigiani Lima Tribst
- Dept of Food Technology, School of Food Engineering, Univ of Campinas, PO Box 6121, 13083-862 Campinas, SP, Brasil.
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Pinho CR, Franchi MA, Tribst AA, Cristianinia M. Effect of High Pressure Homogenization Process on Bacillus Stearothermophilus and Clostridium Sporogenes Spores in Skim Milk. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.profoo.2011.09.131] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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An Update on High Hydrostatic Pressure, from the Laboratory to Industrial Applications. FOOD ENGINEERING REVIEWS 2010. [DOI: 10.1007/s12393-010-9030-4] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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