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Watkins JD, Smith HA, Hengist A, Nielsen SB, Mikkelsen UR, Saunders J, Koumanov F, Betts JA, Gonzalez JT. Effects of physical form of β-lactoglobulin and calcium ingestion on GLP-1 secretion, gastric emptying and energy intake in humans: a randomised crossover trial. Br J Nutr 2024; 131:1730-1739. [PMID: 38287700 PMCID: PMC11063665 DOI: 10.1017/s0007114524000321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 01/03/2024] [Accepted: 01/25/2024] [Indexed: 01/31/2024]
Abstract
The aim of this study was to assess whether adding Ca2+ to aggregate or native forms of β-lactoglobulin alters gut hormone secretion, gastric emptying rates and energy intake in healthy men and women. Fifteen healthy adults (mean ± sd: 9M/6F, age: 24 ± 5 years) completed four trials in a randomised, double-blind, crossover design. Participants consumed test drinks consisting of 30 g of β-lactoglobulin in a native form with (NATIVE + MINERALS) and without (NATIVE) a Ca2+-rich mineral supplement and in an aggregated form both with (AGGREG + MINERALS) and without the mineral supplement (AGGREG). Arterialised blood was sampled for 120 min postprandially to determine gut hormone concentrations. Gastric emptying was determined using 13C-acetate and 13C-octanoate, and energy intake was assessed with an ad libitum meal at 120 min. A protein × mineral interaction effect was observed for total glucagon-like peptide-1 (GLP-1TOTAL) incremental AUC (iAUC; P < 0·01), whereby MINERALS + AGGREG increased GLP-1TOTAL iAUC to a greater extent than AGGREG (1882 ± 603 v. 1550 ± 456 pmol·l-1·120 min, P < 0·01), but MINERALS + NATIVE did not meaningfully alter the GLP-1 iAUC compared with NATIVE (1669 ± 547 v. 1844 ± 550 pmol·l-1·120 min, P = 0·09). A protein × minerals interaction effect was also observed for gastric emptying half-life (P < 0·01) whereby MINERALS + NATIVE increased gastric emptying half-life compared with NATIVE (83 ± 14 v. 71 ± 8 min, P < 0·01), whereas no meaningful differences were observed between MINERALS + AGGREG v. AGGREG (P = 0·70). These did not result in any meaningful changes in energy intake (protein × minerals interaction, P = 0·06). These data suggest that the potential for Ca2+ to stimulate GLP-1 secretion at moderate protein doses may depend on protein form. This study was registered at clinicaltrials.gov (NCT04659902).
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Affiliation(s)
- Jonathan D. Watkins
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
| | - Harry A. Smith
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
| | - Aaron Hengist
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
| | | | | | | | - Francoise Koumanov
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
| | - James A. Betts
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
| | - Javier T. Gonzalez
- Centre for Nutrition, Exercise and Metabolism, Department for Health, University of Bath, Bath, UK
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2
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Liu W, Feng Y, Pan F, Jeantet R, André C, Chen XD, Delaplace G. Effect of calcium on the thermal denaturation of whey proteins and subsequent fouling in a benchtop fouling device: An experimental and numerical approach. FOOD AND BIOPRODUCTS PROCESSING 2022. [DOI: 10.1016/j.fbp.2022.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Abdallah M, Azevedo-Scudeller L, Hiolle M, Lesur C, Baniel A, Delaplace G. Review on mechanisms leading to fouling and stability issues related to heat treatment of casein-based RTD beverages. FOOD AND BIOPRODUCTS PROCESSING 2022. [DOI: 10.1016/j.fbp.2022.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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4
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Huellemeier HA, Eren NM, Payne TD, Schultz ZD, Heldman DR. Monitoring and Characterization of Milk Fouling on Stainless Steel Using a High-Pressure High-Temperature Quartz Crystal Microbalance with Dissipation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:9466-9480. [PMID: 35899940 DOI: 10.1021/acs.langmuir.2c00419] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Fouling at interfaces deteriorates the efficiency and hygiene of processes within numerous industrial sectors, including the oil and gas, biomedical device, and food industries. In the food industry, the fouling of a complex food matrix to a heated stainless steel surface reduces production efficiency by increasing heating resistance, pumping requirements, and the frequency of cleaning operations. In this work, quartz crystal microbalance with dissipation (QCM-D) was used to study the interface formed by the fouling of milk on a stainless steel surface at different flow rates and protein concentrations at high temperatures (135 °C). Subsequently, the QCM-D response was recorded during the cleaning of the foulant. Two phases of fouling were identified. During phase-1, the fouling rate was dependent on the flow rate, while the fouling rate during phase-2 was dependent on the flow rate and protein concentration. During cleaning, foulants deposited at the higher flow rate swelled more than those deposited at the lower flow rate. The composition of the fouling deposits consisted of both protein and mineral species. Two crystalline phases of calcium phosphate, β-tricalcium phosphate and hydroxyapatite, were identified at both flow rates. Stratification in topography was observed across the surface of the QCM-D sensor with a brittle and cracked structure for deposits formed at 0.2 mL/min and a smooth and close-packed structure for deposits formed at 0.1 mL/min. These stratifications in the composition and topography were correlated to differences in the reaction time and flow dynamics at different flow rates. This high-temperature application of QCM-D to complex food systems illuminates the initial interaction between proteins and minerals and a stainless steel surface, which might otherwise be undetectable in low-temperature applications of QCM-D or at larger bench and industrial scales. The methods and results presented here have implications for optimizing processing scenarios that limit fouling formation while also enhancing removal during cleaning.
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Affiliation(s)
- Holly A Huellemeier
- Department of Food, Agricultural, and Biological Engineering, The Ohio State University, 590 Woody Hayes Drive, Columbus, Ohio 43210, United States
| | - Necla M Eren
- Department of Food, Agricultural, and Biological Engineering, The Ohio State University, 590 Woody Hayes Drive, Columbus, Ohio 43210, United States
- Abbott Nutrition Research and Development, Abbott Laboratories, Columbus, Ohio 43219, United States
| | - Taylor D Payne
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Zachary D Schultz
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Dennis R Heldman
- Department of Food, Agricultural, and Biological Engineering, The Ohio State University, 590 Woody Hayes Drive, Columbus, Ohio 43210, United States
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, Columbus, Ohio 43210, United States
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5
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Huang JY, Jones OG, Zhang BY. Interactions of Casein and Carrageenan with Whey during Pasteurization and Their Effects on Protein Deposition. FOOD AND BIOPRODUCTS PROCESSING 2022. [DOI: 10.1016/j.fbp.2022.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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6
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Alhuthali S, Delaplace G, Macchietto S, Bouvier L. Whey protein fouling prediction in plate heat exchanger by combining dynamic modelling, dimensional analysis, and symbolic regression. FOOD AND BIOPRODUCTS PROCESSING 2022. [DOI: 10.1016/j.fbp.2022.05.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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7
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Barone G, Yazdi SR, Lillevang SK, Ahrné L. Calcium: A comprehensive review on quantification, interaction with milk proteins and implications for processing of dairy products. Compr Rev Food Sci Food Saf 2021; 20:5616-5640. [PMID: 34622552 DOI: 10.1111/1541-4337.12844] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 09/01/2021] [Accepted: 09/02/2021] [Indexed: 12/22/2022]
Abstract
Calcium (Ca) is a key micronutrient of high relevance for human nutrition that also influences the texture and taste of dairy products and their processability. In bovine milk, Ca is presented in several speciation forms, such as complexed with other milk components or free as ionic calcium while being distributed between colloidal and serum phases of milk. Partitioning of Ca between these phases is highly dynamic and influenced by factors, such as temperature, ionic strength, pH, and milk composition. Processing steps used during the manufacture of dairy products, such as preconditioning, concentration, acidification, salting, cooling, and heating, all contribute to modify Ca speciation and partition, thereby influencing product functionality, product yield, and fouling of equipment. This review aims to provide a comprehensive understanding of the influence of Ca partition on dairy products properties to support the development of kinetics models to reduce product losses and develop added-value products with improved functionality. To achieve this objective, approaches to separate milk phases, analytical approaches to determine Ca partition and speciation, the role of Ca on protein-protein interactions, and their influence on processing of dairy products are discussed.
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Affiliation(s)
- Giovanni Barone
- Department of Food Science, Ingredients and Dairy Technology, University of Copenhagen, Frederiksberg, Denmark
| | | | | | - Lilia Ahrné
- Department of Food Science, Ingredients and Dairy Technology, University of Copenhagen, Frederiksberg, Denmark
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8
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Françolle de Almeida C, Saget M, Delaplace G, Jimenez M, Fierro V, Celzard A. Innovative fouling-resistant materials for industrial heat exchangers: a review. REV CHEM ENG 2021. [DOI: 10.1515/revce-2020-0094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Fouling of heat exchangers (HEs) has become a major concern across the industrial sector. Fouling is an omnipresent phenomenon but is particularly prevalent in the dairy, oil, and energy industries. Reduced energy performance that results from fouling represents significant operating loss in terms of both maintenance and impact on product quality and safety. In most industries, cleaning or replacing HEs are currently the only viable solutions for controlling fouling. This review examines the latest advances in the development of innovative materials and coatings for HEs that could mitigate the need for costly and frequent cleaning and potentially extend their operational life. To better understand the correlation between surface properties and fouling occurrence, we begin by providing an overview of the main mechanisms underlying fouling. We then present selected key strategies, which can differ considerably, for developing antifouling surfaces and conclude by discussing the current trends in the search for ideal materials for a range of applications. In our presentation of all these aspects, emphasis is given wherever possible to the potential transfer of these innovative surfaces from the laboratory to the three industries most concerned by HE fouling problems: food, petrochemicals, and energy production.
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Affiliation(s)
| | - Manon Saget
- Université Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations , F-59000 Lille , France
| | - Guillaume Delaplace
- Université Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations , F-59000 Lille , France
| | - Maude Jimenez
- Université Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations , F-59000 Lille , France
| | - Vanessa Fierro
- Université de Lorraine, CNRS, IJL , F-88000 Epinal , France
| | - Alain Celzard
- Université de Lorraine, CNRS, IJL , F-88000 Epinal , France
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9
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Saget M, de Almeida CF, Fierro V, Celzard A, Delaplace G, Thomy V, Coffinier Y, Jimenez M. A critical review on surface modifications mitigating dairy fouling. Compr Rev Food Sci Food Saf 2021; 20:4324-4366. [PMID: 34250733 DOI: 10.1111/1541-4337.12794] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 05/18/2021] [Accepted: 06/06/2021] [Indexed: 01/01/2023]
Abstract
Thermal treatments performed in food processing industries generate fouling. This fouling deposit impairs heat transfer mechanism by creating a thermal resistance, thus leading to regular shutdown of the processes. Therefore, periodic and harsh cleaning-in-place (CIP) procedures are implemented. This CIP involves the use of chemicals and high amounts of water, thus increasing environmental burden. It has been estimated that 80% of production costs are owed to dairy fouling deposit. Since the 1970s, different types of surface modifications have been performed either to prevent fouling deposition (anti-fouling) or to facilitate removal (fouling-release). This review points out the impacts of surface modification on type A dairy fouling and on cleaning behaviors under batch and continuous flow conditions. Both types of anti-fouling and fouling-release coatings are reported as well as the different techniques used to modify stainless steel surface. Finally, methods for testing and characterising the effectiveness of coatings in mitigating dairy fouling are discussed.
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Affiliation(s)
- Manon Saget
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France.,Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, Lille, France
| | | | | | | | - Guillaume Delaplace
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France
| | - Vincent Thomy
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, Lille, France
| | - Yannick Coffinier
- Univ. Lille, CNRS, Centrale Lille, Univ. Polytechnique Hauts-de-France, UMR 8520 - IEMN, Lille, France
| | - Maude Jimenez
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, Lille, France.,Institut Universitaire de France, Paris, France
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10
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11
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Calcium Chelation by Phosphate Ions and Its Influence on Fouling Mechanisms of Whey Protein Solutions in a Plate Heat Exchanger. Foods 2021; 10:foods10020259. [PMID: 33513744 PMCID: PMC7912470 DOI: 10.3390/foods10020259] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/22/2021] [Accepted: 01/24/2021] [Indexed: 11/16/2022] Open
Abstract
Fouling of plate heat exchangers (PHEs) is a recurring problem when pasteurizing whey protein solutions. As Ca2+ is involved in denaturation/aggregation mechanisms of whey proteins, the use of calcium chelators seems to be a way to reduce the fouling of PHEs. Unfortunately, in depth studies investigating the changes of the whey protein fouling mechanism in the presence of calcium chelators are scarce. To improve our knowledge, reconstituted whey protein isolate (WPI) solutions were prepared with increasing amounts of phosphate, expressed in phosphorus (P). The fouling experiments were performed on a pilot-scale PHE, while monitoring the evolution of the pressure drop and heat transfer coefficient. The final deposit mass distribution and structure of the fouling layers were investigated, as well as the whey protein denaturation kinetics. Results suggest the existence of two different fouling mechanisms taking place, depending on the added P concentration in WPI solutions. For added P concentrations lower or equal to 20 mg/L, a spongy fouling layer consists of unfolded protein strands bound by available Ca2+. When the added P concentration is higher than 20 mg/L, a heterogeneously distributed fouling layer formed of calcium phosphate clusters covered by proteins in an arborescence structure is observed.
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12
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Effect of casein/whey ratio on the thermal denaturation of whey proteins and subsequent fouling in a plate heat exchanger. J FOOD ENG 2021. [DOI: 10.1016/j.jfoodeng.2020.110175] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Dynamic model to predict heat-induced protein denaturation and fouling in a Direct Contact Steam Condensation process. CHEMICAL ENGINEERING SCIENCE: X 2020. [DOI: 10.1016/j.cesx.2020.100075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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14
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Influence of calcium fortification on physicochemical properties of whey protein concentrate solutions enriched in α-lactalbumin. Food Chem 2020; 317:126412. [DOI: 10.1016/j.foodchem.2020.126412] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 02/07/2020] [Accepted: 02/12/2020] [Indexed: 01/26/2023]
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15
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Liu J, Wiese H, Augustin W, Scholl S, Böl M. Mechanical comparison of milk and whey protein isolate fouling deposits using indentation testings. FOOD AND BIOPRODUCTS PROCESSING 2020. [DOI: 10.1016/j.fbp.2020.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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16
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Blanpain-Avet P, André C, Azevedo-Scudeller L, Croguennec T, Jimenez M, Bellayer S, Six T, Martins G, Delaplace G. Effect of the phosphate/calcium molar ratio on fouling deposits generated by the processing of a whey protein isolate in a plate heat exchanger. FOOD AND BIOPRODUCTS PROCESSING 2020. [DOI: 10.1016/j.fbp.2020.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Wagner J, Biliaderis CG, Moschakis T. Whey proteins: Musings on denaturation, aggregate formation and gelation. Crit Rev Food Sci Nutr 2020; 60:3793-3806. [DOI: 10.1080/10408398.2019.1708263] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Janine Wagner
- Department of Food Science and Technology, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Costas G. Biliaderis
- Department of Food Science and Technology, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Thomas Moschakis
- Department of Food Science and Technology, School of Agriculture, Aristotle University of Thessaloniki, Thessaloniki, Greece
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18
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Gu Y, Bouvier L, Tonda A, Delaplace G. A mathematical model for the prediction of the whey protein fouling mass in a pilot scale plate heat exchanger. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.106729] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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19
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Chen B, Callens D, Campistron P, Moulin E, Debreyne P, Delaplace G. Monitoring cleaning cycles of fouled ducts using ultrasonic coda wave interferometry (CWI). ULTRASONICS 2019; 96:253-260. [PMID: 30745025 DOI: 10.1016/j.ultras.2018.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 10/16/2018] [Accepted: 12/21/2018] [Indexed: 06/09/2023]
Abstract
Fouling in heat exchangers is the buildup of deposits on the solid surfaces. These deposits reduce the eco-efficiency of the processing equipment and increase the risk of subsequent surface contamination with the formation of biofilms. In the agro-food and water supplier sectors, which are our main concern, fouling on the hot walls of processing heat exchangers is a common occurrence and requires frequent cleaning cycles to ensure hygiene requirements are met. This results in a considerable ecological footprint. Sensors and diagnostic tools for monitoring fouling are thus of utmost importance to ensure the rational validation of the cleaning end-point and to decrease the environmental impact of the cleaning cycles. In this paper, a non-destructive ultrasonic monitoring technique using coda waves and the associated signal processing was tested to monitor the evolution over time of a deposit layer on a solid wall during cleaning. To ascertain the feasibility of the method, a piece of wax of controlled thickness was deposited to simulate the initial fouling state and a cleaning cycle was launched. The decorrelation coefficient was used as an indicator to monitor fouling. This article presents the principle of this unprecedented technique for measuring the degree of fouling. The results of the experiments show that this non-destructive monitoring technology is sensitive to changes in fouling and that the decorrelation coefficient curves are in agreement with the cleaning kinetics captured using a video camera, thus ascertaining the pertinence of the diagnostic tool proposed.
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Affiliation(s)
- B Chen
- IEMN UMR-CNRS 8520, Département Opto-Acousto-Electronique, 59313 Valenciennes, France
| | - D Callens
- IEMN UMR-CNRS 8520, Département Opto-Acousto-Electronique, 59313 Valenciennes, France
| | - P Campistron
- IEMN UMR-CNRS 8520, Département Opto-Acousto-Electronique, 59313 Valenciennes, France
| | - E Moulin
- IEMN UMR-CNRS 8520, Département Opto-Acousto-Electronique, 59313 Valenciennes, France.
| | - P Debreyne
- INRA UR638, Processus aux Interfaces et Hygiène des Matériaux, BP 20039, 59651 Villeneuve d'Ascq, France
| | - G Delaplace
- INRA UR638, Processus aux Interfaces et Hygiène des Matériaux, BP 20039, 59651 Villeneuve d'Ascq, France
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Hebishy E, Joubran Y, Murphy E, O'Mahony JA. Influence of calcium-binding salts on heat stability and fouling of whey protein isolate dispersions. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2018.12.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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22
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Peixoto PDS, Trivelli X, André C, Moreau A, Delaplace G. Formation of β-Lactoglobulin Aggregates from Quite, Unfolded Conformations upon Heat Activation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:446-452. [PMID: 30565468 DOI: 10.1021/acs.langmuir.8b03459] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In presence of calcium ions, β-lactoglobulin (BLG) unfolds and subsequently aggregates after heating. This process has important pharmaceutical and agroalimentary applications. Nowadays, the molecular mechanism of unfolding and BLG aggregation, and the role of calcium in the mechanism, is poorly understood. Actually, in most studies, data have been acquired at room temperature, after heating and after aggregation, which makes it difficult to establish a clear causal-temporal relation between calcium binding, heat, and aggregation. Thus, the goal of the present study is to get accurate, nanoscale data about the molecular events leading to BLG unfolding and calcium-dependent aggregation. The molecular transformation of BLG during heating has been investigated, using the NMR pulse field gradient technique, operating in a high field (900 MHz). Thanks to this technique, the molecular conformation of newly formed unfolded BLG molecules can be distinguished in a large pool of native ones. The present work shows that BLG at neutral pH at 65 °C displays fast, cooperative-like unfolding, in which no long-lived intermediary state (as a molten globule one) is detected, before aggregation. These data also indicate that calcium ions bind unfolded BLG in specific sites which might be a necessary feature to form the aggregate. Finally, these data also provide an NMR-based methodology to monitor the rate of protein unfolding using NMR.
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Affiliation(s)
- Paulo D S Peixoto
- Univ. Lille, UMR 8207-UMET-Unité Matériaux et Transformations , 59000 Lille , France
- INRA , 59000 Lille , France
| | - Xavier Trivelli
- Université de Lille, CNRS, UMR 8576-UGSF-Unité de Glycobiologie Structurale et Fonctionnelle , 59655 Lille , France
| | - Christophe André
- Univ. Lille, UMR 8207-UMET-Unité Matériaux et Transformations , 59000 Lille , France
- INRA , 59000 Lille , France
- UC Lille, HEI, Laboratoire de Génie des Procédés , 59046 Lille , France
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23
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Zouaghi S, Abdallah M, André C, Chihib N, Bellayer S, Delaplace G, Celzard A, Jimenez M. Graphite-based composites for whey protein fouling and bacterial adhesion management. Int Dairy J 2018. [DOI: 10.1016/j.idairyj.2018.07.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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