1
|
Song B, Liu D, Lu J, Tao X, Peng X, Wu T, Hou YM, Wang J, Regenstein JM, Zhou P. Lipidomic Comparisons of Whole Cream Buttermilk Whey and Cheese Whey Cream Buttermilk of Caprine Milk. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:11268-11277. [PMID: 38695399 DOI: 10.1021/acs.jafc.4c00792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
Buttermilk is a potential material for the production of a milk fat globule membrane (MFGM) and can be mainly classified into two types: whole cream buttermilk and cheese whey cream buttermilk (WCB). Due to the high casein micelle content of whole cream buttermilk, the removal of casein micelles to improve the purity of MFGM materials is always required. This study investigated the effects of rennet and acid coagulation on the lipid profile of buttermilk rennet-coagulated whey (BRW) and buttermilk acid-coagulated whey (BAW) and compared them with WCB. BRW has significantly higher phospholipids (PLs) and ganglioside contents than BAW and WCB. The abundance of arachidonic acid (ARA)- and eicosapentaenoic acid (EPA)-structured PLs was higher in WCB, while docosahexaenoic acid (DHA)-structured PLs were higher in BRW, indicating that BRW and WCB intake might have a greater effect on improving cardiovascular conditions and neurodevelopment. WCB and BRW had a higher abundance of plasmanyl PL and plasmalogen PL, respectively. Phosphatidylcholine (PC) (28:1), LPE (20:5), and PC (26:0) are characteristic lipids among BRW, BAW, and WCB, and they can be used to distinguish MFGM-enriched whey from different sources.
Collapse
Affiliation(s)
- Bo Song
- State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Dasong Liu
- State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Jing Lu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Key Laboratory of Flavor Chemistry, School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Xiumei Tao
- State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
- Analysis and Testing Center, Jiangnan University, Wuxi, Jiangsu 214122, China
| | - Xiaoyu Peng
- Ausnutria Dairy (China) Co. Ltd., Changsha, Hunan 410200, China
| | - Tong Wu
- Hyproca Nutrition Co., Ltd., Changsha, Hunan 410200, China
| | - Yan-Mei Hou
- Hyproca Nutrition Co., Ltd., Changsha, Hunan 410200, China
| | - Jiaqi Wang
- Ausnutria Dairy (China) Co. Ltd., Changsha, Hunan 410200, China
| | - Joe M Regenstein
- Department of Food Science, Cornell University, Ithaca, New York 14853-7201, United States
| | - Peng Zhou
- State Key Laboratory of Food Science and Resources, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, China
| |
Collapse
|
2
|
Nie C, Zhao Y, Wang X, Li Y, Fang B, Wang R, Wang X, Liao H, Li G, Wang P, Liu R. Structure, Biological Functions, Separation, Properties, and Potential Applications of Milk Fat Globule Membrane (MFGM): A Review. Nutrients 2024; 16:587. [PMID: 38474716 DOI: 10.3390/nu16050587] [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: 11/30/2023] [Revised: 01/22/2024] [Accepted: 01/23/2024] [Indexed: 03/14/2024] Open
Abstract
BACKGROUND The milk fat globule membrane (MFGM) is a thin film that exists within the milk emulsion, suspended on the surface of milk fat globules, and comprises a diverse array of bioactive components. Recent advancements in MFGM research have sparked a growing interest in its biological characteristics and health-related functions. Thorough exploration and utilization of MFGM as a significant bioactive constituent in milk emulsion can profoundly impact human health in a positive manner. Scope and approach: This review comprehensively examines the current progress in understanding the structure, composition, physicochemical properties, methods of separation and purification, and biological activity of MFGM. Additionally, it underscores the vast potential of MFGM in the development of additives and drug delivery systems, with a particular focus on harnessing the surface activity and stability of proteins and phospholipids present on the MFGM for the production of natural emulsifiers and drug encapsulation materials. KEY FINDINGS AND CONCLUSIONS MFGM harbors numerous active substances that possess diverse physiological functions, including the promotion of digestion, maintenance of the intestinal mucosal barrier, and facilitation of nerve development. Typically employed as a dietary supplement in infant formula, MFGM's exceptional surface activity has propelled its advancement toward becoming a natural emulsifier or encapsulation material. This surface activity is primarily derived from the amphiphilicity of polar lipids and the stability exhibited by highly glycosylated proteins.
Collapse
Affiliation(s)
- Chao Nie
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Yunyi Zhao
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Xifan Wang
- Department of Obstetrics and Gynecology, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - Yixuan Li
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Bing Fang
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Ran Wang
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Xiaoyu Wang
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Haiping Liao
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Gengsheng Li
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Pengjie Wang
- Food Laboratory of Zhongyuan, Luohe 462000, China
| | - Rong Liu
- Key Laboratory of Functional Dairy, Co-Constructed by Ministry of Education and Beijing Government, Department of Nutrition and Health, China Agricultural University, Beijing 100083, China
| |
Collapse
|
3
|
Song B, Lu J, Hou Y, Wu T, Tao X, Liu D, Wang Y, Regenstein JM, Liu X, Zhou P. Proteomic Comparisons of Caprine Milk Whole Cream Buttermilk Whey and Cheese Whey Cream Buttermilk. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:933-945. [PMID: 38153029 DOI: 10.1021/acs.jafc.3c07405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Buttermilk, a potential material used to produce milk fat globule membrane (MFGM), is obtained as a byproduct of butter making from milk whole cream and cheese whey cream. This study investigated the effects of rennet and acid coagulation on the protein profiles of buttermilk rennet-coagulated whey (BRW) and buttermilk acid-coagulated whey (BAW). They were compared to those of whey cream buttermilk (WCB). Rennet coagulation was more efficient in removing casein, while retaining more IgG and lactoferrin than acid coagulation. BRW had more MFGM than BAW. Butyrophilin, xanthine dehydrogenase, and mucin1 were significantly higher (P < 0.05) in BRW, while fatty acid-binding protein 3 was enriched in BAW. KEGG analysis showed that complement and coagulation cascades had the greatest differences, and the abundance of proteins involved in this signaling pathway in BRW and BAW was higher, suggesting their potential anticoagulant and anti-inflammatory activity. BAW had higher apolipoprotein A4 and transcobalamin 2, which are essential carriers for transporting long-chain fatty acids and vitamin B12 from the intestine to the blood. Therefore, BAW intake might improve lipids and vitamin B12 absorption. This study can help deepen the understanding of protein composition of MFGM-enriched whey and facilitate the production of MFGM proteins for infants and old-aged populations.
Collapse
Affiliation(s)
- Bo Song
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Jing Lu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Key Laboratory of Flavor Chemistry, School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Yanmei Hou
- Hyproca Nutrition Co., Ltd., Changsha, Hunan Province 410200, China
| | - Tong Wu
- Hyproca Nutrition Co., Ltd., Changsha, Hunan Province 410200, China
| | - Xiumei Tao
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Dasong Liu
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Yancong Wang
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Joe M Regenstein
- Department of Food Science, Cornell University, Ithaca, New York 14853-7201, United States
| | - Xiaoming Liu
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Peng Zhou
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu Province 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| |
Collapse
|
4
|
Señoráns M, Gallo V, Calvo MV, Fontecha J. Lipidomic and Proteomic Profiling of the Milk Fat Globule Membrane from Different Industrial By-Products of the Butter and Butter Oil Manufacturing Process. Foods 2023; 12:foods12040750. [PMID: 36832824 PMCID: PMC9956092 DOI: 10.3390/foods12040750] [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: 01/05/2023] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 02/11/2023] Open
Abstract
Recent studies have demonstrated the positive effects of regular intake of milk fat globule membranes (MFGMs) on neural and cognitive development, as well as immune and gastrointestinal health in infants and elders. Dairy products and by-products generated from the butter and butter oil manufacturing process are valuable sources of MFGM. Thus, in view of the growing need to reduce by-products and waste, it is crucial to foster research aimed at the valorization of dairy by-products rich in MFGM. For this purpose, all the by-products coming from butter and butter oil production (from raw milk to the related by-products) were used to study the MFGM isolated fractions, followed by their characterization through a combined lipidomic and proteomic approach. The patterns of polar lipids and proteins indicated that buttermilk (BM), butterserum (BS), and their mix (BM-BS blend) are the most suitable by-products to be employed as starting material for the isolation and purification of MFGMs, thus obtaining MFGM-enriched ingredients for the manufacture of products with high biological activity.
Collapse
|
5
|
Ibitoye JO, Ly-Nguyen B, Le DN, Dewettinck K, Trzcinski AP, Phan TTQ. Quality of Set Yogurts Made from Raw Milk and Processed Milk Supplemented with Enriched Milk Fat Globule Membrane in a Two-Stage Homogenization Process. Foods 2021; 10:1534. [PMID: 34359403 PMCID: PMC8307699 DOI: 10.3390/foods10071534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/14/2021] [Accepted: 06/26/2021] [Indexed: 11/16/2022] Open
Abstract
Dairy products are relevant in the food industries as functional ingredients for several food products and contribute towards human nutrition in ameliorating certain disorders. In this study, set yogurts were produced from raw milk and processed milk combined with 4% Lacprodan®PL20 concentration and subjected to two-stage pressure homogenization. The total solids concentration of the mixture was raised to 15% using SMP (skim milk powder). The purpose of this study was to investigate the effect of Lacprodan®PL20 on the set yogurt quality produced by homogenization-induced pressure and its interaction with milk components. The changes in the physical and chemical attributes of the milk fat globule membrane (MFGM) via destabilization of the membrane significantly affected the physicochemical properties of set yogurts produced from processed or raw milk. There was a slight variation in MFGM-specific proteins detected in the set yogurts. Set yogurt produced from homogenized raw milk (HRM) had a considerably higher water-holding capacity, firmness, and apparent viscosity. The microstructure of HRM was dense and compacted, unlike non-homogenized raw milk (NRM) with large MFGM fragments and pore holes between the matrixes. The inclusion of homogenization showed a remarkable improvement in set yogurt quality, promoting interaction between MFGM components and milk proteins.
Collapse
Affiliation(s)
- Joshua Oladapo Ibitoye
- Department of Food Technology, Can Tho University, Can Tho City 900000, Vietnam; (J.O.I.); (B.L.-N.); (D.N.L.)
| | - Binh Ly-Nguyen
- Department of Food Technology, Can Tho University, Can Tho City 900000, Vietnam; (J.O.I.); (B.L.-N.); (D.N.L.)
| | - Duy Nghia Le
- Department of Food Technology, Can Tho University, Can Tho City 900000, Vietnam; (J.O.I.); (B.L.-N.); (D.N.L.)
| | - Koen Dewettinck
- Laboratory of Food Technology and Engineering, Department of Food Safety and Food Quality, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium;
| | - Antoine P. Trzcinski
- School of Civil Engineering and Surveying, University of Southern Queensland, West Street, Toowoomba, QLD 4350, Australia;
| | - Thi Thanh Que Phan
- Department of Food Technology, Can Tho University, Can Tho City 900000, Vietnam; (J.O.I.); (B.L.-N.); (D.N.L.)
| |
Collapse
|
6
|
Fontecha J, Brink L, Wu S, Pouliot Y, Visioli F, Jiménez-Flores R. Sources, Production, and Clinical Treatments of Milk Fat Globule Membrane for Infant Nutrition and Well-Being. Nutrients 2020; 12:E1607. [PMID: 32486129 PMCID: PMC7352329 DOI: 10.3390/nu12061607] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 05/26/2020] [Accepted: 05/28/2020] [Indexed: 12/18/2022] Open
Abstract
Research on milk fat globule membrane (MFGM) is gaining traction. The interest is two-fold; on the one hand, it is a unique trilayer structure with specific secretory function. On the other hand, it is the basis for ingredients with the presence of phospho- and sphingolipids and glycoproteins, which are being used as food ingredients with valuable functionality, in particular, for use as a supplement in infant nutrition. This last application is at the center of this Review, which aims to contribute to understanding MFGM's function in the proper development of immunity, cognition, and intestinal trophism, in addition to other potential effects such as prevention of diseases including cardiovascular disease, impaired bone turnover and inflammation, skin conditions, and infections as well as age-associated cognitive decline and muscle loss. The phospholipid composition of MFGM from bovine milk is quite like human milk and, although there are some differences due to dairy processing, these do not result in a chemical change. The MFGM ingredients, as used to improve the formulation in different clinical studies, have indeed increased the presence of phospholipids, sphingolipids, glycolipids, and glycoproteins with the resulting benefits of different outcomes (especially immune and cognitive outcomes) with no reported adverse effects. Nevertheless, the precise mechanism(s) of action of MFGM remain to be elucidated and further basic investigation is warranted.
Collapse
Affiliation(s)
- Javier Fontecha
- Food Lipid Biomarkers and Health Group, Institute of Food Science Research (CIAL, CSIC-UAM), 28049 Madrid, Spain
| | - Lauren Brink
- Department of Medical Affairs, Mead Johnson Nutrition, Evansville, IN 47721, USA; (L.B.); (S.W.)
| | - Steven Wu
- Department of Medical Affairs, Mead Johnson Nutrition, Evansville, IN 47721, USA; (L.B.); (S.W.)
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Yves Pouliot
- STELA Dairy Research Center, Institute of Nutrition and Functional Foods (INAF), Department of Food Sciences, Laval University, Québec, QC G1V 0A6, Canada;
| | - Francesco Visioli
- Department of Molecular Medicine, University of Padova, 35121 Padova, Italy;
- IMDEA-Food, CEI UAM + CSIC, 28049 Madrid, Spain
| | - Rafael Jiménez-Flores
- Food Science and Technology Department, The Ohio State University, Columbus, OH 43210, USA
| |
Collapse
|
7
|
Qu X, Hu H, Wang Y, Cao C, Li H, Liu X, Yu J. Proteomics analysis of milk fat globule membrane enriched materials derived from by-products during different stages of milk-fat processing. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.108531] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
8
|
Jukkola A, Hokkanen S, Kämäräinen T, Partanen R, Heino A, Rojas OJ. Changes in milk fat globules and membrane lipids under the shear fields of microfiltration and centrifugation. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2018.12.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
9
|
Haddadian Z, Eyres GT, Bremer P, Everett DW. Polar lipid composition of the milk fat globule membrane in buttermilk made using various cream churning conditions or isolated from commercial samples. Int Dairy J 2018. [DOI: 10.1016/j.idairyj.2018.01.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
10
|
Jukkola A, Partanen R, Rojas OJ, Heino A. Effect of heat treatment and pH on the efficiency of micro-diafiltration for the separation of native fat globules from cream in butter production. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.11.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
11
|
Ripollés D, Parrón JA, Fraguas J, Calvo M, Pérez MD, Sánchez L. Determination of lactadherin concentration in dairy by-products by ELISA: Effect of heat treatment and hydrolysis. J Dairy Sci 2017; 101:912-923. [PMID: 29153516 DOI: 10.3168/jds.2017-13608] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 09/27/2017] [Indexed: 11/19/2022]
Abstract
Lactadherin is a peripheral glycoprotein of the milk fat globule membrane with several attributed biological activities. In this study, we developed an indirect competitive ELISA to determine lactadherin concentration by using a rabbit polyclonal antiserum. The ELISA was applied to quantify lactadherin in several dairy by-products. Of the products tested, raw and commercial buttermilk had the highest concentrations of lactadherin (6.79 and 5.27 mg/g of product, respectively), followed by commercial butter serum (4.86 mg/g), commercial skim milk (4.84 mg/g), and raw whey (1.20 mg/g). The concentration of immunoreactive lactadherin was also determined in dairy by-products after they were subjected to different technological treatments. Thus, raw products were heat treated at combinations of temperature and time typically used in the dairy industry, and commercial products were hydrolyzed using 3 proteolytic enzyme preparations. Heat treatments of whey and buttermilk resulted in a smaller decrease in lactadherin concentration than did hydrolysis as determined by ELISA and electrophoresis. At high temperatures for long durations, the loss of lactadherin was higher in whey than in buttermilk, with the maximal reduction of around 48% found after treating whey at 72°C for 60 min. Hydrolysis of commercial products with proteolytic enzymes resulted in a marked decrease of immunoreactivity within the first 5 min of treatment, which thereafter was constant throughout 4 h of hydrolysis. These results demonstrate that dairy by-products from milk fat processing are good natural sources of lactadherin, although technological processes have to be considered, because they have different effects on lactadherin content.
Collapse
Affiliation(s)
- Daniel Ripollés
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain
| | - José A Parrón
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain
| | - Javier Fraguas
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain
| | - Miguel Calvo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain
| | - María D Pérez
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain
| | - Lourdes Sánchez
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Instituto Agroalimentario de Aragón (IA2) (Universidad de Zaragoza-CITA), Zaragoza, Spain.
| |
Collapse
|