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Gharbi N, Stone D, Fittipaldi N, Unger S, O'Connor DL, Pouliot Y, Doyen A. Application of pressure homogenization on whole human milk pasteurized by high hydrostatic pressure: Effect on protein aggregates in milk fat globule membrane and skim milk phases. Food Chem 2024; 455:139863. [PMID: 38823140 DOI: 10.1016/j.foodchem.2024.139863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 05/10/2024] [Accepted: 05/26/2024] [Indexed: 06/03/2024]
Abstract
This study explored the impact of homogenization (at pressures of 16, 30, and 45 MPa) on both raw and high hydrostatic pressure (HHP)-treated human milk (HM). It focused on protein compositions and binding forces of soluble and insoluble fractions for both milk fat globule membrane (MFGM) and skim milk. Mild homogenization of HHP-treated milk increased lactoferrin (LF) levels in the insoluble fractions of both MFGM and skim milk, due to insoluble aggregation through hydrophobic interactions. Intense homogenization of HHP-treated milk decreased the LF level in the MFGM fractions due to the LF desorption from the MFGM, which increased LF level in the insoluble skim milk fraction. Homogenized-HHP treated milk showed noticeably higher casein (CN) level at the MFGM compared to homogenized-raw milk, attributed to HHP effect on CN micelles. Overall, the combined use of HHP and shear-homogenization should be avoided as it increased the biological proteins in insoluble fractions.
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Affiliation(s)
- Negar Gharbi
- Departement of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada
| | - Debbie Stone
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada
| | - Nahuel Fittipaldi
- Department of Pathology and Microbiology, Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, QC, Canada; Public Health Ontario, Toronto, Ontario, Canada
| | - Sharon Unger
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada; Department of Nutritional Sciences, University of Toronto, Toronto, Canada,; Department of Pediatrics, University of Toronto, Toronto, Canada; Department of Pediatrics, Sinai Health, Toronto, Canada
| | - Deborah L O'Connor
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada; Department of Nutritional Sciences, University of Toronto, Toronto, Canada,; Translational Medicine Program, The Hospital for Sick Children, Toronto, Canada; Department of Pediatrics, Sinai Health, Toronto, Canada
| | - Yves Pouliot
- Departement of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada
| | - Alain Doyen
- Departement of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada.
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Finnegan EW, Goulding DA, O'Callaghan TF, O'Mahony JA. From lab-based to in-line: Analytical tools for the characterization of whey protein denaturation and aggregation-A review. Compr Rev Food Sci Food Saf 2024; 23:e13289. [PMID: 38343297 DOI: 10.1111/1541-4337.13289] [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: 06/30/2023] [Revised: 10/14/2023] [Accepted: 12/11/2023] [Indexed: 02/15/2024]
Abstract
Whey protein denaturation and aggregation have long been areas of research interest to the dairy industry, having significant implications for process performance and final product functionality and quality. As such, a significant number of analytical techniques have been developed or adapted to assess and characterize levels of whey protein denaturation and aggregation, to either maximize processing efficiency or create products with enhanced functionality (both technological and biological). This review aims to collate and critique these approaches based on their analytical principles and outline their application for the assessment of denaturation and aggregation. This review also provides insights into recent developments in process analytical technologies relating to whey protein denaturation and aggregation, whereby some of the analytical methods have been adapted to enable measurements in-line. Developments in this area will enable more live, in-process data to be generated, which will subsequently allow more adaptive processing, enabling improved product quality and processing efficiency. Along with the applicability of these techniques for the assessment of whey protein denaturation and aggregation, limitations are also presented to help assess the suitability of each analytical technique for specific areas of interest.
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Affiliation(s)
- Eoin W Finnegan
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
- Dairy Processing Technology Centre, University College Cork, Cork, Ireland
| | - David A Goulding
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - T F O'Callaghan
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
- Dairy Processing Technology Centre, University College Cork, Cork, Ireland
| | - James A O'Mahony
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
- Dairy Processing Technology Centre, University College Cork, Cork, Ireland
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Gharbi N, Stone D, Fittipaldi N, Unger S, O'Connor DL, Pouliot Y, Doyen A. Characterization of protein aggregates in cream and skimmed human milk after heat and high-pressure pasteurization treatments. Food Chem 2023; 429:136749. [PMID: 37454618 DOI: 10.1016/j.foodchem.2023.136749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 06/20/2023] [Accepted: 06/26/2023] [Indexed: 07/18/2023]
Abstract
Preservation processes applied to ensure microbial safety of human milk (HM) can modify the native structure of proteins and their bioactivities. Consequently, this study evaluated the effect of pasteurization methods (Holder pasteurization, high-temperature short-time (HTST), and high hydrostatic pressure (HHP)) of whole human milk (HM) on protein aggregates in skim milk and cream fractions. For heat-treated whole milk, insoluble protein aggregates at milk fat globule membrane (MFGM) were formed by disulfide and non-covalent bonds, but insoluble skim milk protein aggregates were only stabilized by non-covalent interactions. Contrary to heat treatment, the insolubilization of main proteins at the MFGM of HHP-treated HM was only through non-covalent interactions rather than disulfide bonds. Moreover, only heat treatment induced the insoluble aggregation of ⍺-lactalbumin. Overall, compared to heat treatment, HHP produced a milder effect on protein aggregation, validating the use of this process to better preserve the native state of HM bioactive proteins.
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Affiliation(s)
- Negar Gharbi
- Department of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada
| | - Debbie Stone
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada
| | - Nahuel Fittipaldi
- Department of Pathology and Microbiology, Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, QC, Canada; Public Health Ontario, Toronto, Ontario, Canada
| | - Sharon Unger
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada; Department of Nutritional Sciences, University of Toronto, Toronto, Canada,; Department of Pediatrics, University of Toronto, Toronto, Canada; Department of Pediatrics, Sinai Health, Toronto, Canada
| | - Deborah L O'Connor
- Rogers Hixon Ontario Human Milk Bank, Mount Sinai Hospital, Toronto, Canada; Department of Nutritional Sciences, University of Toronto, Toronto, Canada,; Translational Medicine Program, The Hospital for Sick Children, Toronto, Canada; Department of Pediatrics, Sinai Health, Toronto, Canada
| | - Yves Pouliot
- Department of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada
| | - Alain Doyen
- Department of Food Sciences, Institute of Nutrition and Functional Foods (INAF) and Dairy Science and Technology Research Centre (STELA), Laval University, Quebec City, Canada.
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Sarmah RJ, Kundu S. Structure and morphology of bovine serum albumin–lysozyme (BSA–Lys) complex films at air–water interface. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107788] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Zheng J, Gao Q, Ge G, Wu J, Tang CH, Zhao M, Sun W. Dynamic equilibrium of β-conglycinin/lysozyme heteroprotein complex coacervates. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2021.107339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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