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Paul A, Martin F, Simard B, Scher J, Gaiani C, le Floch-Fouere C, Jeantet R, Burgain J. Deciphering the segregation of proteins in high-protein dairy powders after spray-drying. J Dairy Sci 2023; 106:843-851. [PMID: 36526460 DOI: 10.3168/jds.2022-22133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 09/09/2022] [Indexed: 12/15/2022]
Abstract
High-protein dairy powders are ingredients mainly produced by spray-drying, then subjected to aging during transport and storage. They often undergo physicochemical changes at this stage, such as the development of the Maillard reaction, primarily because of their intrinsic chemical properties, but also as a result of nonoptimal storage conditions. Components present at the particle surface are the first to be targeted by moisture and other environmental disruptions. Consequently, the identification, control, and prediction of particle surface components are useful to anticipate the effect of powder aging on product quality. Here, a new diafiltration method is proposed which fractionates proteins from a binary colloidal dispersion of 80% casein micelles and 20% whey proteins, according to their presence at the surface or core of the particle. This method shows that whey proteins are strongly enriched at the particle surface, whereas casein micelles are located at the core of the particles. This protocol also allows the identification of the rehydration kinetics for each rehydrated protein layer of the particle, revealing that 2 distinct forms of swelling occur: (1) a rapid swelling and elution of whey proteins present at the particle surface, and (2) a swelling of casein micelles located below the whey proteins, associated with a slow elution of casein micelles from the particles being rehydrated.
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Affiliation(s)
- A Paul
- Laboratoire LIBio, Université de Lorraine, F-54000 Nancy, France; Centre National Interprofessionnel de l'Economie Laitière (CNIEL), F-75314 Paris, France
| | - F Martin
- Centre National Interprofessionnel de l'Economie Laitière (CNIEL), F-75314 Paris, France; STLO, UMR 1253, INRA, L'institut Agro, F-35000 Rennes, France
| | - B Simard
- Laboratoire LIBio, Université de Lorraine, F-54000 Nancy, France
| | - J Scher
- Laboratoire LIBio, Université de Lorraine, F-54000 Nancy, France
| | - C Gaiani
- Laboratoire LIBio, Université de Lorraine, F-54000 Nancy, France; Institut Universitaire de France (IUF)
| | | | - R Jeantet
- STLO, UMR 1253, INRA, L'institut Agro, F-35000 Rennes, France
| | - J Burgain
- Laboratoire LIBio, Université de Lorraine, F-54000 Nancy, France.
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Formation of mucus-permeable nanoparticles from soy protein isolate by partial enzymatic hydrolysis coupled with thermal and pH-shifting treatment. Food Chem 2022; 398:133851. [DOI: 10.1016/j.foodchem.2022.133851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 07/30/2022] [Accepted: 08/01/2022] [Indexed: 11/19/2022]
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Biochemical, microbiological, and structural evaluations to early detect age gelation of milk caused by proteolytic activity of Pseudomonas fluorescens. Eur Food Res Technol 2022. [DOI: 10.1007/s00217-022-04033-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractHeat–stable peptidase AprX, released by Pseudomonas species in raw milk during cold storage, can cause gelation of UHT milk since it is able to split caseinomacropeptides (CMPtot) from κ-casein, so inducing aggregation of casein micelles. Identifying raw milk susceptibility to gelation would allow UHT milk manufacturers to select appropriate processing conditions or give the milk a different destination. Two approaches, i.e., detection of free CMPtot and evidence of casein aggregates, were evaluated as possible indicators for early detecting milk destabilization. With this aim, microfiltered milk was inoculated with a P. fluorescence strain and incubated at either 4 or 25 °C. The presence of CMPtot was detected using capillary electrophoresis after 96 and 24 h at the two temperatures, respectively, when milk also became heat unstable and small flocks of protein appeared. Confocal laser scanning microscopy evidenced initial aggregates of casein micelles after 48 and 24 h at 4 and 25 °C, respectively. Keeping the milk at 25 °C/24 h could be a useful condition to accelerate milk destabilization. Despite the similar timing of instability detection, presence of CMPtot was the only trait specific for AprX activity.
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Han R, Shi R, Yu Z, Ho H, Du Q, Sun X, Wang J, Jiang H, Fan R, Yang Y. Distribution and variation in proteins of casein micellar fractions response to heat-treatment from five dairy species. Food Chem 2021; 365:130640. [PMID: 34329874 DOI: 10.1016/j.foodchem.2021.130640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 06/02/2021] [Accepted: 07/17/2021] [Indexed: 02/04/2023]
Abstract
Casein micelles (CMs) contribute to the physicochemical properties and stability of milk. However, how the proteome of CMs changes following heat treatment has not been elucidated. Here, changes in the proteins of CMs in samples of Holstein, buffalo, yak, goat, and camel milk following heat treatment were investigated using a LC-MS/MS approach. According to the hierarchical clustering results, Holstein, yak, and buffalo milk samples had similar CMs protein components, followed by goat and camel milk samples. Changes in lipoprotein lipase and α-lactalbumin in CMs were dependent on the intensity of heat treatment and were similar among the studied species, whereas changes in κ-casein, lactoferrin, and apolipoprotein A-I differed among different types of milk. These results provide information on the distribution and variations of the proteomes of CMs following heat treatment, which will assist in the identification of proteins that are dissociated and attached to CMs from different dairy species during heat treatment.
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Affiliation(s)
- Rongwei Han
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Runjia Shi
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Zhongna Yu
- Haidu College.Qingdao Agricultural University, Laiyang 265200, Shandong, China.
| | - Harvey Ho
- Auckland Bioengineering Institute, The University of Auckland, Auckland, New Zealand.
| | - Qijing Du
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Xueheng Sun
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Jun Wang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Hongning Jiang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Rongbo Fan
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
| | - Yongxin Yang
- College of Food Science and Engineering, Qingdao Agricultural University, Qingdao 266109, Shandong, China.
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