1
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Breunig S, Crooijmans RPMA, Bovenhuis H, Hettinga K, Bijl E. Linking variation in the casein fraction and salt composition to casein micelle size in milk of Dutch dairy goats. J Dairy Sci 2024; 107:6474-6486. [PMID: 38754827 DOI: 10.3168/jds.2023-24548] [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: 12/14/2023] [Accepted: 03/26/2024] [Indexed: 05/18/2024]
Abstract
The casein composition, salt composition, and micelle size varies substantially between milk samples of individual animals. In goats, the links between those casein characteristics are unknown and could provide useful insights into goat casein micelle structure. In this study, the casein and salt composition of 42 individual Dutch goats from 17 farms was studied and linked to casein micelle size. Micelle size, the proportions of individual caseins, and protein content were associated with one another. Milk with smaller casein micelles was higher in protein content, salt content, and proportion of αs1-CN, but lower in αs2-CN and β-CN. The higher salt content in milk with small casein micelles was mainly attributed to a higher protein content, but changes in casein composition might additionally contribute to differences in mineralization. The nonsedimentable casein content in goat milk correlated with nonsedimentable fractions of β-CN and κ-CN and was independent of micelle size. Between large and small casein micelles, goat casein micelles showed more differences in casein and salt composition than bovine micelles, indicating differences in internal structure. Nevertheless, the casein mineralization in goat milk was similar to casein mineralization in bovine milk, indicating that mineralization of casein micelles follows a general principle. These results can help to better understand how composition and micelle structure in goat milk are related to each other, which may be useful to improve processing and product properties of goat milk in the future.
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Affiliation(s)
- Swantje Breunig
- Food Quality and Design, Wageningen University and Research, 6700 AA Wageningen, the Netherlands; Ausnutria B.V., 8002 LB Zwolle, the Netherlands.
| | - Richard P M A Crooijmans
- Animal Breeding and Genomics, Wageningen University and Research, 6700 AH Wageningen, the Netherlands
| | - Henk Bovenhuis
- Animal Breeding and Genomics, Wageningen University and Research, 6700 AH Wageningen, the Netherlands
| | - Kasper Hettinga
- Food Quality and Design, Wageningen University and Research, 6700 AA Wageningen, the Netherlands
| | - Etske Bijl
- Food Quality and Design, Wageningen University and Research, 6700 AA Wageningen, the Netherlands
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2
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Takagi H, Nakano T, Aoki T, Tanimoto M. A SAXS and USAXS study of the influence of pH on the casein micelle structure. Food Chem 2024; 443:138606. [PMID: 38301565 DOI: 10.1016/j.foodchem.2024.138606] [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: 09/27/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 02/03/2024]
Abstract
Changes in milk pH significantly influence the behavior and physical properties of casein micelles; however, the effects of these changes on casein micelle structures are still unclear. The aim of this study was to elucidate the effect of changes in pH range from 5.9 to 7.1 on the structure of casein micelles in milk using small-angle X-ray scattering (SAXS) and ultra small-angle X-ray scattering (USAXS). The casein micelles formed one-dimensional aggregates. The micelle radius decreased with decreasing pH, whereas the size of the water domain increased. The distance between colloidal calcium phosphates (CCP) remained unchanged, whereas the CCP radius decreased with decreasing pH. Voluminosity, which was calculated from scattering intensities, increased at increased pH. In conclusion, the micelle structure changed significantly in response to changes in pH. Our findings help to understand the changes in the physical properties of milk at various pH levels in terms of the microscopic structure.
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Affiliation(s)
- Hideaki Takagi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
| | - Tomoki Nakano
- Research Division, Minami Nippon Dairy Co-op Co., Ltd., 5282, Takagi, Miyakonojyo, Miyazaki 885-0003, Japan
| | - Takayoshi Aoki
- Professor Emeritus, Kagoshima University, Hoshigamine, Kagoshima 891-0102, Japan
| | - Morimasa Tanimoto
- Professor Emeritus, University of Yamanashi, 4-4-37, Takeda, Kofu, Yamanashi 400-8510, Japan; Department of Food Sciences, Tokyo Seiei College, 1-4-6, Nishishinkoiwa, Katsushika-Ku, Tokyo 124-8530, Japan
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3
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Pan J, Yu Z, Jiang H, Shi C, Du Q, Fan R, Wang J, Bari L, Yang Y, Han R. Effect of lactation on the distribution of mineral elements in goat milk. J Dairy Sci 2024; 107:2774-2784. [PMID: 37949398 DOI: 10.3168/jds.2023-23877] [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: 06/16/2023] [Accepted: 10/24/2023] [Indexed: 11/12/2023]
Abstract
The distribution of mineral elements in milk is crucial for their absorption and utilization, however, there has been limited attention given to the status of mineral elements in goat milk. In this study, goat milk was collected at 4 lactation periods (1-3, 90, 150, 240 d) and separated into 4 fractions (fat, casein, whey, and aqueous phase). The concentrations of Mg, Ca, Na, K, Zn, Fe, Cu, Mn, Co, Ni, Mo, and Cr in 4 fractions were analyzed using an inductively coupled plasma emission spectrometer. Our findings reveal that Ca, Zn, Fe, Cu, Mn, and Cr exhibit the highest levels in casein, while Mo demonstrates the highest content in whey. Additionally, Mg, Na, K, and Ni display the highest concentrations in the aqueous phase. Specifically, the contents of Ca, Cu and Fe in casein decrease from 1-3 to 150 d of lactation but increase from 150 to 240 d of lactation. Furthermore, the content of Mg in the aqueous phase decreases from 1-3 to 90 d of lactation but increases from 90 to 240 d of lactation. The content of Na and K in the aqueous phase decreases from 1-3 to 150 d of lactation. Notably, the content of Mo in whey increases from 1-3 to 150 d of lactation and decreases from 150 to 240 d. Our research contributes to the advancement of understanding the bioavailability of mineral elements in goat milk.
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Affiliation(s)
- Junyu Pan
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China; Key Laboratory of Quality & Safety Control for Milk and Dairy Products of Ministry of Agriculture and Rural Affairs, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, P. R. China
| | - Zhongna Yu
- Haidu College, Qingdao Agricultural University, Laiyang, 265200, Shandong, China
| | - Hongning Jiang
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China
| | - Cuiping Shi
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China
| | - Qijing Du
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China
| | - Rongbo Fan
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China
| | - Jun Wang
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China
| | - Latiful Bari
- Food and Agriculture Research Division, Centre for Advanced Research in Sciences, University of Dhaka, Dhaka-1000, Bangladesh
| | - Yongxin Yang
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China; Qingdao Special Food Research Institute, Qingdao, 266109, Shandong, China
| | - Rongwei Han
- College of Food Science and Engineering, Shandong Technology Innovation Center of Special Food, Qingdao Agricultural University, Qingdao 266109, Shandong, China; Qingdao Special Food Research Institute, Qingdao, 266109, Shandong, China.
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4
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Huppertz T, Shkembi B, Brader L, Geurts J. Dairy Matrix Effects: Physicochemical Properties Underlying a Multifaceted Paradigm. Nutrients 2024; 16:943. [PMID: 38612977 PMCID: PMC11013626 DOI: 10.3390/nu16070943] [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: 03/02/2024] [Revised: 03/22/2024] [Accepted: 03/23/2024] [Indexed: 04/14/2024] Open
Abstract
When food products are often considered only as a source of individual nutrients or a collection of nutrients, this overlooks the importance of interactions between nutrients, but also interactions between nutrients and other constituents of food, i.e., the product matrix. This product matrix, which can be defined as 'The components of the product, their interactions, their structural organization within the product and the resultant physicochemical properties of the product', plays a critical role in determining important product properties, such as product stability, sensory properties and nutritional and health outcomes. Such matrix effects can be defined as 'the functional outcome of specific component(s) as part of a specific product matrix'. In this article, dairy matrix effects are reviewed, with particular emphasis on the nutrition and health impact of dairy products. Such matrix effects are critical in explaining many effects of milk and dairy products on human nutrition and health that cannot be explained solely based on nutrient composition. Examples hereof include the low glycemic responses of milk and dairy products, the positive impact on dental health, the controlled amino acid absorption and the absence of CVD risk despite the presence of saturated fatty acids. Particularly, the changes occurring in the stomach, including, e.g., coagulation of casein micelles and creaming of aggregated fat globules, play a critical role in determining the kinetics of nutrient release and absorption.
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Affiliation(s)
- Thom Huppertz
- Food Quality & Design Group, Wageningen University & Research, 6808 WG Wageningen, The Netherlands
- FrieslandCampina, 3818 LE Amersfoort, The Netherlands;
| | - Blerina Shkembi
- Food Quality & Design Group, Wageningen University & Research, 6808 WG Wageningen, The Netherlands
| | - Lea Brader
- Arla Innovation Center, 8200 Aarhus, Denmark
| | - Jan Geurts
- FrieslandCampina, 3818 LE Amersfoort, The Netherlands;
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5
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M Ller TL, Nielsen SRB, Corredig M. Novel details on the dissociation of casein micelle suspensions as a function of pH and temperature. J Dairy Sci 2023; 106:8368-8374. [PMID: 37678779 DOI: 10.3168/jds.2023-23456] [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: 03/05/2023] [Accepted: 07/03/2023] [Indexed: 09/09/2023]
Abstract
Membrane filtration is a widespread process for fractionation and recombination of milk components. Although the dissociation of micellar caseins has been studied in detail in skim milk, it is important to better understand the dissociation dynamics occurring between the colloidal and noncolloidal fractions in systems of modified composition. This research aimed at understanding the dissociation of casein proteins in micellar fractions depleted of whey proteins. Casein micelle dispersions were tested at neutral pH and pH 6 (using glucono-δ-lactone as acidulant), after incubation at 4°C or 22°C, and compared with skim milk. The ionic composition of the serum phase was measured using inductively coupled plasma-mass spectrometry, and the protein distribution analyzed using reversed phase-HPLC coupled with mass spectrometry. When incubated at 22°C, there were no differences in casein micelle dissociation between skim milk and whey protein-depleted micelles (∼2.6% dissociated casein). No additional dissociation occurred by lowering the pH from 6.8 to 6 at 22°C, albeit there were more soluble ions at low pH (71% Ca and 65% P). At 4°C, there was an increased amount of β-casein found in the serum phase (23-33% of total β-casein). In addition, there was an uneven dissociation behavior of the various genetic β-casein variants, whereof A2 was more readily released with cooling. In skim milk, approximately 22%, 18%, and 14% of κ-, αS2, and αS1-caseins, respectively, were dissociated from the micellar phase upon cooling and acidification to pH 6.0. This was in contrast to whey protein-depleted casein suspensions, in which only 6%, 5%, and 3% of κ-, αS2, and αS1-caseins, respectively, had dissociated. The results suggested that the whey proteins in the serum phase play a role in the equilibrium between colloidal and soluble caseins in milk. This is of great relevance in processes such as cold membrane fractionation, where more attention should be given to the protein composition in the serum phase, especially when concentration is combined with fractionation of the serum proteins.
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Affiliation(s)
| | | | - Milena Corredig
- Department of Food Science, Aarhus University, 8200 Aarhus N, Denmark
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6
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Hammam ARA, Metzger LE. Characteristics of imitation Mozzarella cheese manufactured without emulsifying salts using a combination of culture-based acid curd and micellar casein concentrate. Food Sci Nutr 2023; 11:4616-4624. [PMID: 37576028 PMCID: PMC10420776 DOI: 10.1002/fsn3.3424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 04/25/2023] [Accepted: 04/28/2023] [Indexed: 08/15/2023] Open
Abstract
The objectives of this study were to develop a process to produce acid curd from micellar casein concentrate (MCC) using starter cultures and to manufacture imitation Mozzarella cheese (IMC) using a combination of acid curd and MCC that would confer emulsification ability to the caseins without the use of emulsifying salts (ES). The formulations were targeted to produce IMC with 49.0% moisture, 20.0% fat, 18.0% protein, and 1.5% salt. In the IMC formulation made without ES (FR-2:1), the acid curd was blended with MCC so that the formula contained a 2:1 ratio of protein from acid curd relative to MCC. IMC with ES was also produced as a control. The melt and stretch characteristics of IMC made from FR-2:1 were similar to those of control IMC. We conclude that IMC can be made without ES using a 2:1 ratio of protein from acid curd relative to MCC.
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Affiliation(s)
- Ahmed R. A. Hammam
- Dairy and Food Science DepartmentSouth Dakota State UniversityBrookingsSouth DakotaUSA
- Dairy Science Department, Faculty of AgricultureAssiut UniversityAssiutEgypt
| | - Lloyd E. Metzger
- Dairy and Food Science DepartmentSouth Dakota State UniversityBrookingsSouth DakotaUSA
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7
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Kowalczyk M, Znamirowska-Piotrowska A, Buniowska-Olejnik M, Zaguła G, Pawlos M. Bioavailability of Macroelements from Synbiotic Sheep's Milk Ice Cream. Nutrients 2023; 15:3230. [PMID: 37513648 PMCID: PMC10383885 DOI: 10.3390/nu15143230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 07/19/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
To determine the potential bioavailability of macroelements (Ca, Mg, P, K), probiotic ice cream samples (Lactaseibacillus paracasei L-26, Lactobacillus casei 431, Lactobacillus acidophilus LA-5, Lactaseibacillus rhamnosus and Bifidobacterium animalis ssp. lactis BB-12) from sheep's milk with inulin, apple fiber and inulin, or apple fiber and control samples were submitted to in vitro digestion in the mouth, stomach and small intestine. The bioavailability of calcium in the ice cream samples ranged from 40.63% to 54.40%, whereas that of magnesium was 55.64% to 44.42%. The highest bioavailability of calcium and magnesium was shown for the control samples. However, adding 4% inulin reduced the bioavailability of calcium by about 3-5% and magnesium only by about 5-6%. Adding 4% apple fiber reduced the bioavailability of calcium by as much as 6-12% and magnesium by 7-8%. The highest bioavailability of calcium was determined in ice cream with L. paracasei, and the highest bioavailability of magnesium was determined in ice cream with L. casei. The bioavailability of phosphorus in ice cream ranged from 47.82% to 50.94%. The highest bioavailability of phosphorus (>50%) was in sheep ice cream fermented by B. animalis. In the control ice cream, the bioavailability of potassium was about 60%. In ice cream with inulin, the bioavailability of potassium was lower by 3-4%, and in ice cream with apple fiber, the bioavailability of potassium was lower by up to 6-9%. The bioavailability of potassium was significantly influenced only by the addition of dietary fiber. The results of the study confirmed the beneficial effect of bacteria on the bioavailability of Ca, Mg and P.
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Affiliation(s)
- Magdalena Kowalczyk
- Department of Dairy Technology, Institute of Food Technology and Nutrition, College of Natural Sciences, University of Rzeszow, Ćwiklińskiej 2D, 35-601 Rzeszów, Poland
| | - Agata Znamirowska-Piotrowska
- Department of Dairy Technology, Institute of Food Technology and Nutrition, College of Natural Sciences, University of Rzeszow, Ćwiklińskiej 2D, 35-601 Rzeszów, Poland
| | - Magdalena Buniowska-Olejnik
- Department of Dairy Technology, Institute of Food Technology and Nutrition, College of Natural Sciences, University of Rzeszow, Ćwiklińskiej 2D, 35-601 Rzeszów, Poland
| | - Grzegorz Zaguła
- Department of Bioenergetics, Food Analysis and Microbiology, Institute of Food and Nutrition Technology, College of Natural Science, University of Rzeszow, Ćwiklińskiej 2D, 35-601 Rzeszów, Poland
| | - Małgorzata Pawlos
- Department of Dairy Technology, Institute of Food Technology and Nutrition, College of Natural Sciences, University of Rzeszow, Ćwiklińskiej 2D, 35-601 Rzeszów, Poland
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8
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Hammam ARA, Kapoor R, Metzger LE. Manufacture of a novel cultured micellar casein concentrate ingredient for emulsifying salt free process cheese products applications. J Dairy Sci 2023; 106:3137-3154. [PMID: 36907765 DOI: 10.3168/jds.2022-22652] [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: 08/14/2022] [Accepted: 10/18/2022] [Indexed: 03/12/2023]
Abstract
Micellar casein concentrate (MCC) is a high protein ingredient that is typically produced using 3 stages of microfiltration with a 3× concentration factor and diafiltration. Acid curd is an acid protein concentrate, which can be obtained by precipitating the casein at pH 4.6 (isoelectric point) using starter cultures or direct acids without the use of rennet. Process cheese product (PCP) is a dairy food prepared by blending dairy ingredients with nondairy ingredients and then heating the mixture to get a product with an extended shelf-life. Emulsifying salts are critical for the desired functional characteristics of PCP because of their role in calcium sequestration and pH adjustment. The objectives of this study were to develop a process to produce a novel cultured micellar casein concentrate ingredient (cMCC; culture-based acid curd) and to produce PCP without emulsifying salts using different combinations of protein from cMCC and MCC in the formulations (2.0:1.0, 1.9:1.1, and 1.8:1.2). Skim milk was pasteurized at 76°C for 16 s and then microfiltered in 3 microfiltration stages using graded permeability ceramic membranes to produce liquid MCC (11.15% total protein; TPr and 14.06% total solids; TS). Part of the liquid MCC was spray dried to produce MCC powder (75.77% TPr and 97.84% TS). The rest of the MCC was used to produce cMCC (86.9% TPr and 96.4% TS). Three PCP treatments were formulated with different ratios of cMCC:MCC, including 2.0:1.0, 1.9:1.1, and 1.8:1.2 on the protein basis. The composition of PCP was targeted to 19.0% protein, 45.0% moisture, 30.0% fat, and 2.4% salt. This trial was repeated 3 times using different batches of cMCC and MCC powders. All PCP were evaluated for their final functional properties. No significant differences were detected in the composition of PCP made with different ratios of cMCC and MCC except for the pH. The pH was expected to increase slightly with elevating the MCC amount in the PCP formulations. The end apparent viscosity was significantly higher in 2.0:1.0 formulation (4,305 cP) compared with 1.9:1.1 (2,408 cP) and 1.8:1.2 (2,499 cP). The hardness ranged from 407 to 512 g with no significant differences within the formulations. However, the melting temperature showed significant differences with 2.0:1.0 having the highest melting temperature (54.0°C), whereas 1.9:1.1 and 1.8:1.2 showed 43.0 and 42.0°C melting temperature, respectively. The melting diameter (38.8 to 43.9 mm) and melt area (1,183.9 to 1,538.6 mm2) did not show any differences in different PCP formulations. The PCP made with a 2.0:1.0 ratio of protein from cMCC and MCC showed better functional properties compared with other formulations.
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Affiliation(s)
- Ahmed R A Hammam
- Dairy and Food Science Department, South Dakota State University, Brookings 57007; Dairy Science Department, Faculty of Agriculture, Assiut University, Assiut 71515, Egypt.
| | | | - Lloyd E Metzger
- Dairy and Food Science Department, South Dakota State University, Brookings 57007
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Sekiguchi K, Tanimoto M, Fujii S. Mesoscopic Characterization of the Early Stage of the Glucono-δ-Lactone-Induced Gelation of Milk via Image Analysis Techniques. Gels 2023; 9:gels9030202. [PMID: 36975651 PMCID: PMC10048486 DOI: 10.3390/gels9030202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 03/03/2023] [Accepted: 03/04/2023] [Indexed: 03/09/2023] Open
Abstract
We provide a method for quantifying the kinetics of gelation in milk acidified with glucono-δ-lactone (GDL) using image analysis techniques, particle image velocimetry (PIV), differential variance analysis (DVA) and differential dynamic microscopy (DDM). The gelation of the milk acidified with GDL occurs through the aggregation and subsequent coagulation of the casein micelles as the pH approaches the isoelectric point of the caseins. The gelation of the acidified milk with GDL is an important step in the production of fermented dairy products. PIV qualitatively monitors the average mobility of fat globules during gelation. The gel point estimated by PIV is in good agreement with that obtained by rheological measurement. DVA and DDM methods reveal the relaxation behavior of fat globules during gelation. These two methods make it possible to calculate microscopic viscosity. We also extracted the mean square displacement (MSD) of the fat globules, without following their movement, using the DDM method. The MSD of fat globules shifts to sub-diffusive behavior as gelation progresses. The fat globules used as probes show the change in matrix viscoelasticity caused by the gelling of the casein micelles. Image analysis and rheology can be used complementarily to study the mesoscale dynamics of the milk gel.
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Affiliation(s)
- Kento Sekiguchi
- Department of Food and Life Sciences, Toyo University, 1-1-1, Izumino, Itakura, Oratown 374-0193, Gunma, Japan
| | - Morimasa Tanimoto
- Faculty of Health and Nutrition, Department of Food Sciences, Tokyo Seiei College, 1-4-6, Shinkoiwa, Katsushika, Tokyo 124-8530, Japan
| | - Shuji Fujii
- Department of Food and Life Sciences, Toyo University, 1-1-1, Izumino, Itakura, Oratown 374-0193, Gunma, Japan
- Correspondence: ; Tel.: +81-(0)276-82-9214
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10
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Garcia A, Alting A, Huppertz T. Disruption of casein micelles by calcium sequestering salts: from observations to mechanistic insights. Int Dairy J 2023. [DOI: 10.1016/j.idairyj.2023.105638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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11
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Spatial distribution of αs1-caseins and β-caseins in milk gels acidified with glucono-δ-lactone. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2023.108506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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12
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Tieu S, Harte F. Effect of mild thermal and pH changes on the sol-gel transition in skim milk. J Dairy Sci 2022; 105:7926-7939. [PMID: 35965122 DOI: 10.3168/jds.2021-21299] [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: 09/15/2021] [Accepted: 03/13/2022] [Indexed: 11/19/2022]
Abstract
The present work aimed to improve acid and rennet milk gelation properties with mild thermal and pH changes to skim milk, with emphasis on heating temperatures below the denaturation temperature of whey proteins. We hypothesized the heat-induced, pH-dependent micellar changes, namely the shifts in casein and calcium equilibria between the micellar (or colloidal) and serum phases, result in firmer acid and rennet milk gels and reduced gelation time. Homogenized, pasteurized skim milk was adjusted to pH values in the range of 6.4 to 7.3, heated at temperatures in the range of 50 to 80°C, cooled to refrigeration temperature, and restored to native pH (pH 6.7). Then, acid and rennet gels were made by the addition of glucono-δ-lactone and chymosin, respectively. We monitored the storage modulus (G', Pa) during gel formation with small-amplitude oscillatory shear and the gelation time and maximum G' (G'max, Pa) of acid and rennet gels, were measured at 3 and 2 h, respectively. When skim milk was heated at 50°C for 15 min, there was a 58 and 163% increase in the G'max of acid and rennet gels, respectively, as the pH at heating was raised from pH 6.7 to 7.3. Increases in gel strength were greater for skim milk heated at 60°C for 15 min. There was a positive correlation between G'max of acid gels and the heat-induced casein protein exchanges between the micellar and serum phases on heating milk at pH in the range from 6.4 to 7.3 (r = 0.78). We also found positive correlations between the variation in G'max of rennet gels with the heat-induced, pH-dependent migration of casein (r = 0.83) and calcium (r = 0.80) from the micelle into the serum phase, as determined by PAGE and atomic emission spectroscopy. Under these mild heating temperatures (50 and 60°C), rennet coagulation time was significantly reduced from 45 ± 5 to 27 ± 3 min when the pH at heating was raised from pH 6.7 to 7.3. The ability to enhance milk gelation properties with a scalable pretreatment allows for the expression of novel functionality of casein.
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Affiliation(s)
- Stiphany Tieu
- Department of Food Science, The Pennsylvania State University, University Park 16802
| | - Federico Harte
- Department of Food Science, The Pennsylvania State University, University Park 16802.
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13
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Calcium-Reduced Micellar Casein Concentrate-Physicochemical Properties of Powders and Functional Properties of the Dispersions. Foods 2022; 11:foods11101377. [PMID: 35626947 PMCID: PMC9141348 DOI: 10.3390/foods11101377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/25/2022] [Accepted: 05/06/2022] [Indexed: 11/17/2022] Open
Abstract
This study aimed to examine the physicochemical properties of 30% calcium (Ca)-reduced micellar casein 80% protein powders (RC-MCC) and the functional properties of the resultant dispersions. The calcium reduction in the micellar casein (MCC) powder was achieved by subjecting the liquid micellular casein obtained from the microfiltration of pasteurized skim milk to carbon dioxide (CO2) treatment before and during ultrafiltration. The CO2 injection was controlled to obtain a 0 and 30% reduction in calcium in the C-MCC (control) and RC-MCC powders, respectively. The MCC powders were tested for physicochemical properties such as chemical composition, particle size distribution, and bulk density. The MCC powders were reconstituted in deionized water to test the functional properties of the dispersions, i.e., solubility, viscosity, heat stability, emulsifying capacity, emulsion stability, foam capacity, and foam stability. The CO2 injection did not result in any significant differences in the composition except mineral contents, particularly calcium. The particle size and bulk density of RC-MCC powders were significantly (p < 0.05) lower than control powders. The RC-MCC powder dispersions showed increased heat stability compared to control, whereas no significant changes in viscosity and emulsification capacity were observed between the two dispersions. However, the emulsion stability and foam stability of RC-MCC dispersions were significantly lower than C-MCC dispersions. This study showed that by utilizing a novel microfiltration−CO2 injection−ultrafiltration process, 30% calcium-reduced MCC powder was commercially feasible. This research also provides a detailed understanding of the effect of calcium reduction on the functional properties of resultant MCC dispersions. It showed that calcium reduction could improve the solubility of the powders and heat stability and foam capacity of the dispersions.
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14
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Anema SG, Lee SK, Klostermeyer H. Reconstituted skim milk: effect of re-dilution after heating concentrated milk at different pH and temperatures. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2022.105368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Physico-chemical and functional properties of milk protein concentrates obtained using a two-stage decalcification approach. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2021.105216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Shkembi B, Huppertz T. Calcium Absorption from Food Products: Food Matrix Effects. Nutrients 2021; 14:nu14010180. [PMID: 35011055 PMCID: PMC8746734 DOI: 10.3390/nu14010180] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/23/2021] [Accepted: 12/28/2021] [Indexed: 12/14/2022] Open
Abstract
This article reviews physicochemical aspects of calcium absorption from foods. Notable differences are observed between different food products in relation to calcium absorption, which range from <10% to >50% of calcium in the foods. These differences can be related to the interactions of calcium with other food components in the food matrix, which are affected by various factors, including fermentation, and how these are affected by the conditions encountered in the gastrointestinal tract. Calcium absorption in the intestine requires calcium to be in an ionized form. The low pH in the stomach is critical for solubilization and ionization of calcium salts present in foods, although calcium oxalate complexes remain insoluble and thus poorly absorbable. In addition, the rate of gastric transit can strongly affect fractional absorption of calcium and a phased release of calcium into the intestine, resulting in higher absorption levels. Dairy products are the main natural sources of dietary calcium in many diets worldwide, which is attributable to their ability to provide high levels of absorbable calcium in a single serving. For calcium from other food products, lower levels of absorbable calcium can limit contributions to bodily calcium requirements.
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Affiliation(s)
- Blerina Shkembi
- Food Quality & Design Group, Wageningen University & Research, 6708 WG Wageningen, The Netherlands;
| | - Thom Huppertz
- Food Quality & Design Group, Wageningen University & Research, 6708 WG Wageningen, The Netherlands;
- FrieslandCampina, 3818 LE Amersfoort, The Netherlands
- Correspondence:
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Tarapata J, Lobacz A, Zulewska J. Physicochemical properties of skim milk gels obtained by combined bacterial fermentation and renneting: Effect of incubation temperature at constant inoculum level. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2021.105167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Li S, Ye A, Pan Z, Cui J, Dave A, Singh H. Dynamic in vitro gastric digestion behavior of goat milk: Effects of homogenization and heat treatments. J Dairy Sci 2021; 105:965-980. [PMID: 34802734 DOI: 10.3168/jds.2021-20980] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 10/15/2021] [Indexed: 02/01/2023]
Abstract
The gastric digestion behavior of differently processed goat milks was investigated using a dynamic in vitro gastric digestion model, the human gastric simulator. Homogenization and heat treatment of goat milk resulted in gastric clots with highly fragmented structures. They also delayed the pH reduction during digestion, altered the chemical composition of the clots and the emptied digesta, promoted the release of calcium from the clots, and accelerated the hydrolysis and the emptying of milk proteins. The apparent density of the protein particles and the location of the homogenized fat globules changed during the digestion process, as shown in the emptied digesta of the homogenized goat milks. The effects of processing on the digestion behavior of goat milk were broadly similar to those previously reported for cow milk. However, the overall gastric digestion process of goat milk was more affected by homogenization than by heat treatments.
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Affiliation(s)
- Siqi Li
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Aiqian Ye
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
| | - Zheng Pan
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Jian Cui
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Anant Dave
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Harjinder Singh
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
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19
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Sadiq U, Gill H, Chandrapala J. Casein Micelles as an Emerging Delivery System for Bioactive Food Components. Foods 2021; 10:foods10081965. [PMID: 34441743 PMCID: PMC8392355 DOI: 10.3390/foods10081965] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/18/2021] [Accepted: 08/20/2021] [Indexed: 12/18/2022] Open
Abstract
Bioactive food components have potential health benefits but are highly susceptible for degradation under adverse conditions such as light, pH, temperature and oxygen. Furthermore, they are known to have poor solubilities, low stabilities and low bioavailabilities in the gastrointestinal tract. Hence, technologies that can retain, protect and enable their targeted delivery are significant to the food industry. Amongst these, microencapsulation of bioactives has emerged as a promising technology. The present review evaluates the potential use of casein micelles (CMs) as a bioactive delivery system. The review discusses in depth how physicochemical and techno-functional properties of CMs can be modified by secondary processing parameters in making them a choice for the delivery of food bioactives in functional foods. CMs are an assembly of four types of caseins, (αs1, αs2, β and κ casein) with calcium phosphate. They possess hydrophobic and hydrophilic properties that make them ideal for encapsulation of food bioactives. In addition, CMs have a self-assembling nature to incorporate bioactives, remarkable surface activity to stabilise emulsions and the ability to bind hydrophobic components when heated. Moreover, CMs can act as natural hydrogels to encapsulate minerals, bind with polymers to form nano capsules and possess pH swelling behaviour for targeted and controlled release of bioactives in the GI tract. Although numerous novel advancements of employing CMs as an effective delivery have been reported in recent years, more comprehensive studies are required to increase the understanding of how variation in structural properties of CMs be utilised to deliver bioactives with different physical, chemical and structural properties.
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20
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The heterogeneous substructure of casein micelles evidenced by SAXS and NMR in demineralized samples. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2021.106653] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Hammam ARA, Martínez-Monteagudo SI, Metzger LE. Progress in micellar casein concentrate: Production and applications. Compr Rev Food Sci Food Saf 2021; 20:4426-4449. [PMID: 34288367 DOI: 10.1111/1541-4337.12795] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 05/12/2021] [Accepted: 06/06/2021] [Indexed: 01/11/2023]
Abstract
Micellar casein concentrate (MCC) is a novel ingredient with high casein content. Over the past decade, MCC has emerged as one of the most promising dairy ingredients having applications in beverages, yogurt, cheese, and process cheese products. Industrially, MCC is manufactured by microfiltration (MF) of skim milk and is commercially available as a liquid, concentrated, or dried containing ≥9, ≥22, and ≥80% total protein, respectively. As an ingredient, MCC not only imparts a bland flavor but also offers unique functionalities such as foaming, emulsifying, wetting, dispersibility, heat stability, and water-binding ability. The high protein content of MCC represents a valuable source of fortification in a number of food formulations. For the last 20 years, MCC is utilized in many applications due to the unique physiochemical and functional characteristics. It also has promising applications to eliminate the cost of drying by producing concentrated MCC. This work aims at providing a succinct overview of the historical progress of the MCC, a review on the manufacturing methods, a discussion of MCC properties, varieties, and applications.
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Affiliation(s)
- Ahmed R A Hammam
- Dairy and Food Science Department, South Dakota State University, Brookings, South Dakota.,Dairy Science Department, Faculty of Agriculture, Assiut University, Assiut, Egypt
| | - Sergio I Martínez-Monteagudo
- Department of Family and Consumer Sciences, New Mexico State University, Las Cruces, New Mexico.,Department of Chemical & Materials Engineering, New Mexico State University, Las Cruces, New Mexico
| | - Lloyd E Metzger
- Dairy and Food Science Department, South Dakota State University, Brookings, South Dakota
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22
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Calcium fortification of a model infant milk formula system using soluble and insoluble calcium salts. Int Dairy J 2021. [DOI: 10.1016/j.idairyj.2020.104951] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Tang CH. Assembled milk protein nano-architectures as potential nanovehicles for nutraceuticals. Adv Colloid Interface Sci 2021; 292:102432. [PMID: 33934002 DOI: 10.1016/j.cis.2021.102432] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/22/2021] [Accepted: 04/24/2021] [Indexed: 12/21/2022]
Abstract
Nanoencapsulation of hydrophobic nutraceuticals with food ingredients has become one of topical research subjects in food science and pharmaceutical fields. To fabricate food protein-based nano-architectures as nanovehicles is one of effective strategies or approaches to improve water solubility, stability, bioavailability and bioactivities of poorly soluble or hydrophobic nutraceuticals. Milk proteins or their components exhibit a great potential to assemble or co-assemble with other components into a variety of nano-architectures (e.g., nano-micelles, nanocomplexes, nanogels, or nanoparticles) as potential nanovehicles for encapsulation and delivery of nutraceuticals. This article provides a comprehensive review about the state-of-art knowledge in utilizing milk proteins to assemble or co-assemble into a variety of nano-architectures as promising encapsulation and delivery nano-systems for hydrophobic nutraceuticals. First, a brief summary about composition, structure and physicochemical properties of milk proteins, especially caseins (or casein micelles) and whey proteins, is presented. Then, the disassembly and reassembly behavior of caseins or whey proteins into nano-architectures is critically reviewed. For caseins, casein micelles can be dissociated and further re-associated into novel micelles, through pH- or high hydrostatic pressure-mediated disassembly and reassembly strategy, or can be directly formed from caseinates through a reassembly process. In contrast, the assembly of whey protein into nano-architectures usually needs a structural unfolding and subsequent aggregation process, which can be induced by heating, enzymatic hydrolysis, high hydrostatic pressure and ethanol treatments. Third, the co-assembly of milk proteins with other components into nano-architectures is also summarized. Last, the potential and effectiveness of assembled milk protein nano-architectures, including reassembled casein micelles, thermally induced whey protein nano-aggregates, α-lactalbumin nanotubes or nanospheres, co-assembled milk protein-polysaccharide nanocomplexes or nanoparticles, as nanovehicles for nutraceuticals (especially those hydrophobic) are comprehensively reviewed. Due to the fact that milk proteins are an important part of diets for human nutrition and health, the review is of crucial importance not only for the development of novel milk protein-based functional foods enriched with hydrophobic nutraceuticals, but also for providing the newest knowledge in the utilization of food protein assembly behavior in the nanoencapsulation of nutraceuticals.
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24
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Uribe-Alvarez R, O'Shea N, Murphy CP, Coleman-Vaughan C, Guinee TP. Evaluation of rennet-induced gelation under different conditions as a potential method for 3D food printing of dairy-based high-protein formulations. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106542] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Roy D, Ye A, Moughan PJ, Singh H. Structural changes in cow, goat, and sheep skim milk during dynamic in vitro gastric digestion. J Dairy Sci 2020; 104:1394-1411. [PMID: 33309366 DOI: 10.3168/jds.2020-18779] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 09/18/2020] [Indexed: 11/19/2022]
Abstract
Coagulation of milk in the stomach is the first crucial step in its digestion. Using a human gastric simulator, the dynamic gastric digestion of goat and sheep skim milk were compared with that of cow skim milk, focusing particularly on their physical characteristics. The gastric contents were analyzed for changes in dry matter and microstructure, and the extent of protein digestion. The study revealed that the skim milk from all species formed a curd within the first 15 min of gastric digestion, at which time the pH was ~6.1 to 6.3. Compared with cow skim milk, the dry matter contents of the clots formed from goat and sheep skim milk were lower and higher, respectively, which was due to the differences in their total solids and protein contents. Microstructural analysis showed that, as digestion progressed, the clot structure became more cohesive, along with a decrease in moisture content, which in turn affected the breakdown and hydrolysis of caseins by pepsin; this phenomenon was similar for milk from all species. However, the extent of moisture retained in the sheep skim milk clot appeared to be lower than those of the cow and goat skim milk clots. In addition, the relative firmness of the sheep milk clot was higher than those of the cow and goat milk clots at the end of gastric digestion. The pattern of protein hydrolysis by pepsin was similar for the milk of all species, despite the differences in the proportions of different proteins. The study provided insight into the coagulation kinetics of goat and sheep skim milk under in vitro gastric digestion conditions.
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Affiliation(s)
- Debashree Roy
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Aiqian Ye
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Paul J Moughan
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Harjinder Singh
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
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26
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Duerasch A, Herrmann P, Hogh K, Henle T. Study on β-Casein Depleted Casein Micelles: Micellar Stability, Enzymatic Cross-Linking, and Suitability as Nanocarriers. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:13940-13949. [PMID: 33200608 DOI: 10.1021/acs.jafc.0c00904] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
β-Casein is an amphiphilic protein and thus considered as multilaterally bound in casein micelles. Its polar molecule part, in particular the phosphoserine residues, can interact electrostatically with colloidal calcium phosphate (CCP) to form nanoclusters and its nonpolar molecule part enhances micellar stability by forming hydrophobic bonds to other caseins. Because cooling weakens hydrophobic interactions, a substantial portion of β-casein can be irreversibly removed from the casein micelle by repeated depletion steps, including cooling and subsequent ultracentrifugation. Although this effect of cooling on the micellar β-casein concentration has been well known for decades, the influence of depletion on the main characteristics of casein micelles has been less investigated yet. Therefore, we aimed to analyze the consequences of β-casein depletion on the stability as well as the functionality of casein micelles to evaluate the suitability of depleted compared to native casein micelles as nanocarriers. Up to 43.2% of the total β-casein was irreversibly sequestered from native casein micelles by repeated cooling and ultracentrifugation steps. Depletion showed no effect on size distribution as well as polydispersity and particle concentration of micelle suspensions as measured via dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA), respectively. Furthermore, the stability of the micelles against ethanol or the chelating agent ethylene glycol-bis(β-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA) was not influenced by β-casein depletion. Notwithstanding, depleted micelles were less susceptible to enzymatic cross-linking by microbial transglutaminase (mTG), indicating narrowed water channels due to depletion. Additionally, loading experiments showed that depleted micelles could be loaded with linoleic acid (LA) as intensively as native micelles, whereupon LA displaces up to 81.3% of β-casein from native micelles. Our results confirm that depletion does not enhance the ability of the casein micelle to act as a nanocarrier for hydrophobic substances but could support the understanding of the casein micelle structure. Based on the observed unchanged stability against EGTA, the hindered enzymatical cross-linking, and the efficient displacing of β-casein by LA, we suggest that the major portion of micellar β-casein is hydrophobically incorporated into the micelle structure without impact on the formation of calcium phosphate nanoclusters. The main role of β-casein for the casein micelle structure, therefore, might be to facilitate the high hydration of the interior and thus the high permeability of casein micelles.
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Affiliation(s)
- Anja Duerasch
- Chair of Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
| | - Pia Herrmann
- Chair of Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
| | - Konstantin Hogh
- Chair of Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
| | - Thomas Henle
- Chair of Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
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27
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Roy D, Ye A, Moughan PJ, Singh H. Gelation of milks of different species (dairy cattle, goat, sheep, red deer, and water buffalo) using glucono-δ-lactone and pepsin. J Dairy Sci 2020; 103:5844-5862. [PMID: 32331870 DOI: 10.3168/jds.2019-17571] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 02/24/2020] [Indexed: 11/19/2022]
Abstract
Dynamic low-amplitude oscillatory rheology was used to study the gelation properties of skim milk gels made at 37°C, using glucono-δ-lactone alone (acid gels) or a combination of glucono-δ-lactone and porcine pepsin ("combination gels"). The protein contents of the skim milks increased in the order goat milk < cattle milk < buffalo milk < sheep milk < deer milk, whereas the average casein micelle diameters increased in the order cattle milk < buffalo milk < goat milk < sheep milk ≃ deer milk. The gelation pH (4.55-4.73) of all milks were close to the isoelectric pH (4.6) of casein, except for buffalo milk, which had a significantly higher gelation pH (5.72). The storage moduli (G') of the acid gels increased with time in the milks of all species except for buffalo milk, for which a double peak in G' was observed. The final storage moduli after 6 h (G'final) increased in the order goat milk < cattle milk < sheep milk < deer milk < buffalo milk. In general, for the combination gels, the G'final values and the gelation pH increased to variable extents, except for goat milk. Confocal scanning laser microscopy showed that goat milk and cattle milk formed gels with more open protein networks compared with the dense clustered protein networks of the milks with high protein content (buffalo, sheep, and deer milks). This study indicates that milks from different species respond differently under the action of an acid precursor and pepsin. These results can be used to provide a better understanding of curd making and the digestion properties of noncattle milks.
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Affiliation(s)
- Debashree Roy
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Aiqian Ye
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Paul J Moughan
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
| | - Harjinder Singh
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand.
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28
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Lazzaro F, Bouchoux A, Raynes J, Williams R, Ong L, Hanssen E, Lechevalier V, Pezennec S, Cho HJ, Logan A, Gras S, Gaucheron F. Tailoring the structure of casein micelles through a multifactorial approach to manipulate rennet coagulation properties. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Hettiarachchi CA, Swulius MT, Harte FM. Assessing constituent volumes and morphology of bovine casein micelles using cryo-electron tomography. J Dairy Sci 2020; 103:3971-3979. [PMID: 32171507 DOI: 10.3168/jds.2019-17016] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 01/21/2020] [Indexed: 11/19/2022]
Abstract
We investigated the applicability of cryo-electron tomography as a method to quantify changes in the major constituents of casein micelles (i.e., casein proteins, putative colloidal calcium phosphate nanoclusters, and serum-filled voids and channels) in response to their environment. Skim milk diluted 20-fold in milk serum was used for this study. Tomograms were generated for multiple casein micelles at 2 different pH values (6.7 and 6.0) and pixel intensity thresholds were identified for each constituent. The volume of each constituent was determined using these thresholds and expressed as a fraction of micelle volume. At the given dilution, a significant decrease in the volume fractions of casein proteins (∼37%) and putative colloidal calcium phosphate nanoclusters (∼67%) was observed with the reduction of pH from 6.7 to 6.0. Assessment of casein micelle fraction obtained by ultracentrifugation of corresponding skim milk samples produced comparable results. When using such an approach, the imaging conditions, denoising methods, and thresholding approaches used can all affect the precision of the measurements, but the overall trends in constituent volumes are able to be tracked. The primary advantage of using cryo-electron tomography is that analysis can be done at the level of individual micelles, within a 3-dimensional morphological context. This workflow paves the way for high-throughput exploration of milk micelles and how their environment shapes their composition and structure.
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Affiliation(s)
| | - Matthew T Swulius
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, Hershey 17033.
| | - Federico M Harte
- Department of Food Science, Pennsylvania State University, University Park 16802.
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30
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Dönmez Ö, Mogol BA, Gökmen V, Tang N, Andersen ML, Chatterton DEW. Modulation of gastrointestinal digestion of β-lactoglobulin and micellar casein following binding by (−)-epigallocatechin-3-gallate (EGCG) and green tea flavanols. Food Funct 2020; 11:6038-6053. [DOI: 10.1039/d0fo00783h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Milk proteins bind flavanoids (EGCG and green tea extract), affecting theirin vitrodigestibility and modulating flavanoid free radical scavenging.
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Affiliation(s)
- Özge Dönmez
- Food Quality and Safety (FoQuS) Research Group
- Department of Food Engineering
- Hacettepe University
- Ankara
- Turkey
| | - Burçe Ataç Mogol
- Food Quality and Safety (FoQuS) Research Group
- Department of Food Engineering
- Hacettepe University
- Ankara
- Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group
- Department of Food Engineering
- Hacettepe University
- Ankara
- Turkey
| | - Ning Tang
- Department of Food Science
- Faculty of Science
- University of Copenhagen
- DK-1958 Frederiksberg C
- Denmark
| | - Mogens Larsen Andersen
- Department of Food Science
- Faculty of Science
- University of Copenhagen
- DK-1958 Frederiksberg C
- Denmark
| | - Dereck E. W. Chatterton
- Department of Food Science
- Faculty of Science
- University of Copenhagen
- DK-1958 Frederiksberg C
- Denmark
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31
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32
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Li Q, Zhao Z. Acid and rennet-induced coagulation behavior of casein micelles with modified structure. Food Chem 2019; 291:231-238. [PMID: 31006464 DOI: 10.1016/j.foodchem.2019.04.028] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/02/2019] [Accepted: 04/06/2019] [Indexed: 01/20/2023]
Affiliation(s)
- Quanyang Li
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
| | - Zhengtao Zhao
- College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
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33
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Kern L, Fabre O, Scher J, Petit J. Chemical fractionation of caseins by differential precipitation: influence of pH, calcium addition, protein concentration and temperature on the depletion in α‐ and β‐caseins. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14283] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loïc Kern
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
| | - Olivier Fabre
- Agria Grand Est 2 rue du Doyen Marcel Roubault, Bâtiment Géologie54505 Vandoeuvre‐lès‐Nancy France
| | - Joël Scher
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
| | - Jeremy Petit
- LIBio (Laboratoire d'Ingénierie des Biomolécules) Université de Lorraine F‐54000 Nancy France
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34
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Dussault-Chouinard I, Britten M, Pouliot Y. Improving rennet coagulation and cheesemaking properties of reverse osmosis skim milk concentrates by pH adjustment. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2019.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Treatment of infant formula with patiromer dose dependently decreases potassium concentration. Pediatr Nephrol 2019; 34:1395-1401. [PMID: 30963285 DOI: 10.1007/s00467-019-04232-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 03/04/2019] [Accepted: 03/07/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Hyperkalemia is a potentially life-threatening complication of chronic kidney disease (CKD). Dietary potassium restriction is challenging in infants despite low-potassium formulas. Decreasing potassium in formula using patiromer, a new calcium-based cation exchange polymer may be one option to accomplish this; however, data confirming efficacy is lacking. METHODS Varying doses of patiromer were added to prepared Similac Advance and Similac PM 60/40. Measurements of potassium, calcium, sodium, magnesium, and phosphorus were obtained at baseline and at 30 min, 60 min, and 24 h following patiromer administration. RESULTS Following pre-treatment with patiromer, the potassium concentration of both formulas decreased. This effect was mild with the lowest dose but increased in a dose-dependent fashion. Treating for 60 min or 24 h did not yield substantially greater effects than treating for 30 min. Calcium levels increased in both formula groups, mostly in a dose-dependent fashion. Changes in magnesium, sodium, and phosphorus were also seen after patiromer pre-treatment. CONCLUSIONS Pre-treatment with patiromer decreases the potassium concentration of infant formula. Calcium levels increased after treatment as expected with the majority of ion exchange occurring in 30 min. Treatment of formula with patiromer shows promise as a unique option for managing hyperkalemia.
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Pandalaneni K, Bhanduriya K, Amamcharla J, Marella C, Metzger L. Influence of milk protein concentrates with modified calcium content on enteral dairy beverage formulations: Storage stability. J Dairy Sci 2019; 102:155-163. [DOI: 10.3168/jds.2018-15239] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 09/21/2018] [Indexed: 11/19/2022]
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37
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Kamigaki T, Ito Y, Nishino Y, Miyazawa A. Microstructural observation of casein micelles in milk by cryo-electron microscopy of vitreous sections (CEMOVIS). Microscopy (Oxf) 2018; 67:164-170. [PMID: 29509921 DOI: 10.1093/jmicro/dfy012] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 02/09/2018] [Indexed: 11/14/2022] Open
Abstract
Casein micelles are present in bovine milk as colloidal particles with diameters of 20-600 nm, which are complex macromolecular assemblies composed of four distinct types of casein and colloidal calcium phosphate (CCP). Multiple structural models of casein micelles have been proposed based on their biochemical or physical properties and observed using electron microscopy. However, the CCP distribution and crosslinking structure between CCP and casein remain unclear. Therefore, the internal structure of casein micelles in raw milk was observed using cryo-electron microscopy of vitreous sections (CEMOVIS) with high precision at high resolution. The results confirmed that the average casein micelle diameter was about 140 nm, and that the CCP diameter in casein micelles was about 2-3 nm, with an average diameter of 2.3 nm. The distribution of CCP in casein micelles was not uniform, with an average interval between CCPs of about 5.4 nm. Areas containing no black particles (attributed to CCP) were present, with an average size of about 19.1 nm. Considering previous reports, these areas possibly correspond to pores or cavities filled with water. Based on differences in the density of structures in casein micelles, we estimated that some of the casein aggregates were able to connect with CCP in a string.
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Affiliation(s)
- Takamichi Kamigaki
- Milk Science Research Institute, MEGMILK SNOW BRAND Co., Ltd., 1-1-2 Minamidai, Kawagoe, Saitama 350-1165, Japan
| | - Yosiko Ito
- Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Yuri Nishino
- Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
| | - Atsuo Miyazawa
- Graduate School of Life Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo 678-1297, Japan
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39
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Moeller H, Martin D, Schrader K, Hoffmann W, Pargmann S, Kurz J, Lorenzen PC. Comparative studies of loading lipophilic substances into casein micelles and investigating the influence of whey proteins and heat treatment on loading stability. INT J DAIRY TECHNOL 2018. [DOI: 10.1111/1471-0307.12535] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
| | | | | | | | - Stefanie Pargmann
- Schokoladenfabrik Gustav Berning GmbH & Co. KG; Georgsmarienhütte Germany
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40
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Gulati A, Galvin N, Lewis E, Hennessy D, O'Donovan M, McManus JJ, Fenelon MA, Guinee TP. Outdoor grazing of dairy cows on pasture versus indoor feeding on total mixed ration: Effects on gross composition and mineral content of milk during lactation. J Dairy Sci 2018; 101:2710-2723. [DOI: 10.3168/jds.2017-13338] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 08/15/2017] [Indexed: 11/19/2022]
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41
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Arias JLDO, Schneider A, Batista-Andrade JA, Vieira AA, Caldas SS, Primel EG. Chitosan from shrimp shells: A renewable sorbent applied to the clean-up step of the QuEChERS method in order to determine multi-residues of veterinary drugs in different types of milk. Food Chem 2018; 240:1243-1253. [DOI: 10.1016/j.foodchem.2017.08.041] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 06/21/2017] [Accepted: 08/13/2017] [Indexed: 01/19/2023]
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42
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43
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Nguyen BT, Chassenieux C, Nicolai T, Schmitt C. Effect of the pH and NaCl on the microstructure and rheology of mixtures of whey protein isolate and casein micelles upon heating. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2017.03.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Margolies B, Adams MC, Pranata J, Gondoutomo K, Barbano DM. Effect of uncertainty in composition and weight measures in control of cheese yield and fat loss in large cheese factories. J Dairy Sci 2017; 100:6822-6852. [DOI: 10.3168/jds.2016-12295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Accepted: 04/08/2017] [Indexed: 11/19/2022]
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45
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46
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Biochemical and physico-chemical changes of skim milk during acidification with glucono- δ -lactone and hydrogen chloride. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.12.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Rayanatou IA, Mahamadou EG, Garric G, Harel-Oger M, Leduc A, Jardin J, Briard-Bion V, Cauty C, Adakal H, Grongnet JF, Gaucheron F. Physico-chemical characterization of dairy gel obtained by a proteolytic extract from Calotropis procera - A comparison with chymosin. Food Chem 2017; 232:405-412. [PMID: 28490091 DOI: 10.1016/j.foodchem.2017.04.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 03/09/2017] [Accepted: 04/04/2017] [Indexed: 10/19/2022]
Abstract
Chymosin is the major enzyme used in cheesemaking but latex enzymes are also used. The aim of this work was to characterize the composition and the structure of dairy gel obtained by an extract of Calotropis procera leaves in comparison with those obtained by chymosin. The biochemical and mineral compositions of the curds and the cheese yields obtained by using Calotropis procera extract or chymosin were relatively similar. Quantitative and qualitative evaluations of proteolysis after milk coagulation, determined by the non-protein nitrogen content and chromatography coupled to mass spectrometry, indicated that Calotropis procera extract was more proteolytic than chymosin and that κ-casein was proteolyzed. The main consequence of proteolysis by Calotropis procera extract or chymosin was the formation of a similar and regular network with the presence of aggregates of casein micelles. These results support that Calotropis procera extract can be used as effective coagulant in cheesemaking.
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Affiliation(s)
- Issa Ado Rayanatou
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France; Faculté d'Agronomie et des Sciences de l'Environnement, Université Dandicko Dankoulodo de Maradi, BP 465 ADS Maradi, Niger
| | - ElHadji Gounga Mahamadou
- Faculté d'Agronomie et des Sciences de l'Environnement, Université Dandicko Dankoulodo de Maradi, BP 465 ADS Maradi, Niger
| | - Gilles Garric
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Marielle Harel-Oger
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Arlette Leduc
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Julien Jardin
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Valérie Briard-Bion
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Chantal Cauty
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France
| | - Hassane Adakal
- Faculté d'Agronomie et des Sciences de l'Environnement, Université Dandicko Dankoulodo de Maradi, BP 465 ADS Maradi, Niger
| | | | - Frédéric Gaucheron
- STLO, UMR 1253, INRA, Agrocampus Ouest, 35000 Rennes, France; Agrocampus Ouest, 65 rue de St-Brieuc, 35042 Rennes Cedex, France.
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48
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Moeller H, Martin D, Schrader K, Hoffmann W, Lorenzen PC. Native casein micelles as nanocarriers for β-carotene: pH-and temperature-induced opening of the micellar structure. Int J Food Sci Technol 2017. [DOI: 10.1111/ijfs.13387] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Henrike Moeller
- Department of Safety and Quality of Milk and Fish Products; Max Rubner-Institut; Kiel Germany
| | - Dierk Martin
- Department of Safety and Quality of Milk and Fish Products; Max Rubner-Institut; Kiel Germany
| | - Katrin Schrader
- Department of Safety and Quality of Milk and Fish Products; Max Rubner-Institut; Kiel Germany
| | - Wolfgang Hoffmann
- Department of Safety and Quality of Milk and Fish Products; Max Rubner-Institut; Kiel Germany
| | - Peter Chr. Lorenzen
- Department of Safety and Quality of Milk and Fish Products; Max Rubner-Institut; Kiel Germany
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49
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O'Connell A, Kelly AL, Tobin J, Ruegg PL, Gleeson D. The effect of storage conditions on the composition and functional properties of blended bulk tank milk. J Dairy Sci 2016; 100:991-1003. [PMID: 27988127 DOI: 10.3168/jds.2016-11314] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Accepted: 10/21/2016] [Indexed: 11/19/2022]
Abstract
The objective of this study was to investigate the effects of storage temperature and duration on the composition and functional properties of bulk tank milk when fresh milk was added to the bulk tank twice daily. The bulk tank milk temperature was set at each of 3 temperatures (2, 4, and 6°C) in each of 3 tanks on 2 occasions during two 6-wk periods. Period 1 was undertaken in August and September when all cows were in mid lactation, and period 2 was undertaken in October and November when all cows were in late lactation. Bulk tank milk stored at the 3 temperatures was sampled at 24-h intervals during storage periods of 0 to 96 h. Compositional parameters were measured for all bulk tank milk samples, including gross composition and quantification of nitrogen compounds, casein fractions, free amino acids, and Ca and P contents. The somatic cell count, heat stability, titratable acidity, and rennetability of bulk tank milk samples were also assessed. Almost all parameters differed between mid and late lactation; however, the interaction between lactation, storage temperature, and storage duration was significant for only 3 parameters: protein content and concentrations of free cysteic acid and free glutamic acid. The interaction between storage temperature and storage time was not significant for any parameter measured, and temperature had no effect on any parameter except lysine: lysine content was higher at 6°C than at 2°C. During 96 h of storage, the concentrations of some free amino acids (glutamic acid, lysine, and arginine) increased, which may indicate proteolytic activity during storage. Between 0 and 96 h, minimal deterioration was observed in functional properties (rennet coagulation time, curd firmness, and heat stability), which was most likely due to the dissociation of β-casein from the casein micelle, which can be reversed upon pasteurization. Thus, this study suggests that blended milk can be stored for up to 96 h at temperatures between 2°C and 6°C with little effect on its composition or functional properties.
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Affiliation(s)
- A O'Connell
- Teagasc, Livestock Systems Research Department, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland; Department of Dairy Science, University of Wisconsin-Madison, Madison 53706
| | - A L Kelly
- Department of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - J Tobin
- Food Chemistry and Technology Department, Teagasc Food Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
| | - P L Ruegg
- Department of Dairy Science, University of Wisconsin-Madison, Madison 53706
| | - D Gleeson
- Teagasc, Livestock Systems Research Department, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland.
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50
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Meletharayil G, Metzger L, Patel HA. Influence of hydrodynamic cavitation on the rheological properties and microstructure of formulated Greek-style yogurts. J Dairy Sci 2016; 99:8537-8548. [DOI: 10.3168/jds.2015-10774] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 05/23/2016] [Indexed: 11/19/2022]
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