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Alberdi-Cedeño J, Aichner M, Mistlberger-Reiner A, Shi A, Pignitter M. Effect of Encapsulation Material on Lipid Bioaccessibility and Oxidation during In Vitro Digestion of Black Seed Oil. Antioxidants (Basel) 2023; 12:antiox12010191. [PMID: 36671054 PMCID: PMC9854819 DOI: 10.3390/antiox12010191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/06/2023] [Accepted: 01/10/2023] [Indexed: 01/15/2023] Open
Abstract
Different encapsulation materials might not only affect lipid hydrolysis but also lipid oxidation during in vitro digestion. Thus, this study aimed to investigate the effect of two commonly used shell materials, starch and gelatin, on the extent of lipolysis and bioaccessibility of the main and some minor lipid compounds, as well as on the oxidative status in encapsulated black seed oil (Nigella sativa) during in vitro digestion. The study was carried out using 1H nuclear magnetic resonance spectroscopy, liquid chromatography-mass spectrometry and high-performance liquid chromatography-UV. It was shown that starch increased the level of lipid hydrolysis in black seed oil during gastric in vitro digestion, while no differences were observed in the intestinal digestates between starch-encapsulated oil and gelatin-encapsulated oil. Similarly, the bioaccessibility of minor compounds (tocopherols, sterols and thymoquinone) was not influenced by the shell materials. However, regarding lipid oxidation, a 20- and 10-fold rise of free oxylipins was obtained in oils encapsulated by starch and gelatin, respectively, after intestinal in vitro digestion. This study evidenced that gelatin rather than starch should be used for the encapsulation of oils to minimize the digestion-induced formation of bioactive oxylipins.
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Affiliation(s)
- Jon Alberdi-Cedeño
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Food Technology, Faculty of Pharmacy, Lascaray Research Center, University of the Basque Country (UPV-EHU), 01006 Vitoria-Gasteiz, Spain
| | - Martha Aichner
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Agnes Mistlberger-Reiner
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Aimin Shi
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Correspondence:
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Yuan C, Zhang K, Wang Z, Ma X, Liu H, Zhao J, Lu W, Wang J. Dietary flaxseed oil and vitamin E improve semen quality via propionic acid metabolism. Front Endocrinol (Lausanne) 2023; 14:1139725. [PMID: 37124753 PMCID: PMC10140321 DOI: 10.3389/fendo.2023.1139725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 03/15/2023] [Indexed: 05/02/2023] Open
Abstract
Introduction Flaxseed oil (FO) and vitamin E (VE) both have antioxidant effects on sperm. The present study investigated the effects of dietary supplementation with FO and/or VE on semen quality. Methods 16 fertile Simmental bulls were selected and randomly divided into 4 groups (n = 4): the control group (control diet), FO group (control diet containing 24 g/kg FO), VE group (control diet containing 150 mg/kg VE) and FOVE group (control diet containing 150 mg/kg VE and 24 g/kg FO), and the trial lasted 10 weeks. Results The results showed that the addition of FO independently can increase sperm motion parameters, the levels of catalase (CAT), glutathione peroxidase (GSH-Px), testosterone (T) and estradiol (E2), while reduce oxidative stress in seminal plasma (P < 0.05). Supplement of VE independently can increased the motility, motility parameters, CAT and superoxide dismutase (SOD) levels, and reduce oxidative stress in seminal plasma (P < 0.05). There was an interaction effect of FO × VE on motility and reactive oxygen species (ROS), while GSH-Px and ROS were affected by week × VE 2-way interaction, levels of T and E2 were also affected by the dietary FO × week interaction (P < 0.05). The triple interaction effects of FO, VE and week were significant for malondialdehyde (MDA) (P < 0.05). Compared with the control group, sperm from the FOVE group had a significantly higher in vitro fertilization (IVF) rate, and subsequent embryos had increased developmental ability with reduced ROS levels at the eight-cell stage, then increased adenosine triphosphate (ATP) content and gene expression levels of CAT, CDX2, Nanog, and SOD at the blastocyst stage (P < 0.05). Metabolomic and transcriptomic results indicated that dietary supplementation of FO and VE increased the expression of the metabolite aconitic acid, as well as the expression of ABAT and AHDHA genes. Conclusion With in-silico analysis, it can be concluded that the effects of dietary FO and VE on improving semen quality and embryo development may be related to increased aconitic acid via the ABAT and AHDHA genes involved in the propionic acid metabolism pathway.
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Affiliation(s)
- Chongshan Yuan
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Kaiyan Zhang
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Zhe Wang
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Xin Ma
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Hongyu Liu
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
| | - Jing Zhao
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- *Correspondence: Jing Zhao, ; Wenfa Lu, ; Jun Wang,
| | - Wenfa Lu
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- *Correspondence: Jing Zhao, ; Wenfa Lu, ; Jun Wang,
| | - Jun Wang
- Joint Laboratory of the Modern Agricultural Technology International Cooperation, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- Key Lab of the Animal Production, Product Quality, and Security, Ministry of Education, Jilin Agricultural University, Changchun, Jilin, China
- *Correspondence: Jing Zhao, ; Wenfa Lu, ; Jun Wang,
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Abstract
The formation of linolenic (Ln) and linoleic (L) acyl oxidation products during storage of flaxseed oil (FO)-in-water emulsions was monitored using proton nuclear magnetic resonance (1H NMR) spectroscopy, as well as chemical analytical methods and gas chromatography. Emulsions containing 10% FO and 1% Tween 60 were prepared by homogenization and then stored at 37 °C in the dark for 21 days under accelerated oxidation conditions (500 μmol ferrous sulfate). The induction time of the emulsions, after which rapid lipid oxidation was first observed, was 5-7 days, as shown by increases in peroxide values and hydroperoxide concentrations determined by NMR spectroscopy. Analysis of the hexanal and propanal concentrations during storage by HS-SPME-GC indicated that the oxidation of Ln and L acyls in the emulsions occurred simultaneously. The oxidation products originating from the Ln and L acyls were monitored using 1H NMR spectroscopy throughout the oxidation process. These results also showed that the Ln and L acyls oxidized simultaneously, and isomers of hydroperoxy-cyclic hydroperoxides (HCPs), Z,E-conjugated dienic hydroperoxides (ZECDHPs), and E,E-conjugated dienic hydroperoxides (EECDHPs) were the major primary oxidation products. Aldehydes were observed after 7 days, which was taken to be the start of the propagation stage, with the formation of a significant amount of oxygenated α, β-unsaturated aldehydes (OαβUAs). Based on the concentrations of hydroperoxides originating from the Ln and L acyls, our results suggested that the loss rate of L acyls was parallel to that of Ln acyls. This result was consistent with Ln acyls adopting a tighter packing at the oil-water interface in the emulsions than L acyls. This hypothesis was supported by the NMR relaxation time data. A good correlation between the isomer concentrations of ZECDHPs and HCPs in Ln acyls and between ZECDHPs and EECDHPs in L acyls was shown, with the mole ratios between them being 1.2 and 1.1, respectively. Droplet size and microstructure analyses showed that droplet aggregation occurred from 11 days onwards, which was attributed to polar oxidation products located at the oil droplet surfaces promoting coalescence. Zeta-potential measurements indicated that the droplets became more negative during storage, which was attributed to the accumulation of anionic reaction products at the droplet surfaces.
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Affiliation(s)
- Jun Liu
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, Henan Province 450001, China
- Institute of Grain and Oil Standardization, Henan University of Technology, Zhengzhou, Henan Province 450001, China
| | - Ya Juan Wang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, Henan Province 450001, China
| | - Xue Yan Huang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, Henan Province 450001, China
| | - Xing Zhen Li
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, Henan Province 450001, China
| | - Chuan Guo Ma
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou, Henan Province 450001, China
| | - David Julian McClements
- Department of Food Science, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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Li Q, Lu J, Chang Y, Shen G, Feng J. Effect of different cooking methods on nutritional intake and different storage treatments on nutritional losses of abalone. Food Chem 2022; 377:132047. [PMID: 35008016 DOI: 10.1016/j.foodchem.2022.132047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/24/2021] [Accepted: 01/01/2022] [Indexed: 11/26/2022]
Abstract
As the most important marine edible shellfish, the nutritional quality of abalone has been paid attention. In this study, the chemical and nutritional compositions of abalones were obtained, and three cooking methods, steaming, boiling and frying, were evaluated by in vitro gastric digestion simulation to understand their nutritional changes by 1H NMR spectroscopy combined with multivariate statistical analyses. The nutritional losses were also monitored under different cold storage conditions. The results indicated that boiling can keep more amino acids and fatty acids than steaming and frying, thus being recommended as the best cooking method of abalone. The abalone could maintain fresh within one day under 4 °C, and the deterioration process occurred subsequently. These results help to understand the digestion of cooked abalone and the changes of nutrients through storage and cooking process, leading to a scientific recommendation of cooking method and storage condition for healthy eating.
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Affiliation(s)
- Quanquan Li
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China
| | - Jie Lu
- Key Laboratory of South China Sea Fishery Resource Exploitation & Utilization, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China
| | - Yajie Chang
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China
| | - Guiping Shen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China
| | - Jianghua Feng
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China.
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Luo Y, Li A, Shen M, Yu M, Wu Z, Liu X, Yin F, Zhou D. Effects of gallic acid and its alkyl esters on lipid oxidation during
in vitro
simulated gastrointestinal digestion of fresh and fried oysters. Int J Food Sci Technol 2022. [DOI: 10.1111/ijfs.15548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ying Luo
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
| | - Ao Li
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
| | - Miao Shen
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
| | - Man‐Man Yu
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
| | - Zi‐Xuan Wu
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
| | - Xiao‐Yang Liu
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
- National Engineering Research Center of Seafood Dalian 116034 People’s Republic of China
- Collaborative Innovation Center of Seafood Deep Processing Dalian People’s Republic of China 116034
| | - Fa‐Wen Yin
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
- National Engineering Research Center of Seafood Dalian 116034 People’s Republic of China
- Collaborative Innovation Center of Seafood Deep Processing Dalian People’s Republic of China 116034
| | - Da‐Yong Zhou
- School of Food Science and Technology Dalian Polytechnic University Dalian 116034 People’s Republic of China
- National Engineering Research Center of Seafood Dalian 116034 People’s Republic of China
- Collaborative Innovation Center of Seafood Deep Processing Dalian People’s Republic of China 116034
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Nieva-Echevarría B, Goicoechea E, Sopelana P, Guillén MD. Different Effects of Vitamin C-Based Supplements on the Advance of Linseed Oil Component Oxidation and Lipolysis during In Vitro Gastrointestinal Digestion. Foods 2021; 11:58. [PMID: 35010183 PMCID: PMC8750871 DOI: 10.3390/foods11010058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/14/2021] [Accepted: 12/22/2021] [Indexed: 11/25/2022] Open
Abstract
Although widely consumed, dietary supplements based on Vitamin C contain high doses of this compound, whose impact on lipid oxidation during digestion needs to be addressed. Therefore, the effect of seven commercial supplements and of pure l-ascorbic acid and ascorbyl palmitate on linseed oil during in vitro gastrointestinal digestion was tackled. The advance of lipid oxidation was studied through the generation of oxidation compounds, the degradation of polyunsaturated fatty acyl chains and of gamma-tocopherol, by employing Proton Nuclear Magnetic Resonance. Supplements containing exclusively l-ascorbic acid enhanced the advance of linseed oil oxidation during digestion. This was evidenced by increased formation of linolenic-derived conjugated hydroxy-dienes and alkanals and by the generation of conjugated keto-dienes and reactive alpha,beta-unsaturated aldehydes, such as 4,5-epoxy-2-alkenals; moreover, gamma-tocopherol was completely degraded. Conversely, supplements composed of mixtures of ascorbic acid/salt with citric acid and carotenes, and of ascorbyl palmitate, protected linseed oil against oxidation and reduced gamma-tocopherol degradation. The study through Solid Phase Microextraction-Gas Chromatography/Mass Spectrometry of the volatile compounds of the digests corroborated these findings. Furthermore, a decreased lipid bioaccessibility was noticed in the presence of the highest dose of l-ascorbic acid. Both the chemical form of Vitamin C and the presence of other ingredients in dietary supplements have shown to be of great relevance regarding oxidation and hydrolysis reactions occurring during lipid digestion.
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Affiliation(s)
| | | | | | - María D. Guillén
- Food Technology, Lascaray Research Center, Faculty of Pharmacy, University of the Basque Country (UPV/EHU), 01006 Vitoria-Gasteiz, Spain; (B.N.-E.); (E.G.); (P.S.)
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Márquez-Ruiz G, Holgado F, Ruiz-Méndez MV, Velasco J. Chemical Changes of Hydroperoxy-, Epoxy-, Keto- and Hydroxy-Model Lipids under Simulated Gastric Conditions. Foods 2021; 10:foods10092035. [PMID: 34574145 PMCID: PMC8471306 DOI: 10.3390/foods10092035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 08/24/2021] [Accepted: 08/27/2021] [Indexed: 11/16/2022] Open
Abstract
Chemical changes occurring in dietary lipid oxidation compounds throughout the gastrointestinal tract are practically unknown. The first site for potential chemical modifications is the stomach due to the strong acidic conditions. In this study, model lipids representative of the most abundant groups of dietary oxidation compounds were subjected to in vitro gastric conditions. Thus, methyl linoleate hydroperoxides were used as representative of the major oxidation compounds formed in food storage at low and moderate temperatures. Methyl 9,10-epoxystearate, 12-oxostearate and 12-hydroxystearate were selected as model compounds bearing the oxygenated functional groups predominantly found in oxidation compounds formed at the high temperatures of frying. Analyses were performed using gas-liquid chromatography/flame ionization detection/mass spectrometry and high performance-liquid chromatography/ultraviolet detection. Losses of methyl 9,10-epoxystearate and linoleate hydroperoxides in the ranges 17.8–58.8% and 42.3–61.7% were found, respectively, whereas methyl 12-oxostearate and methyl 12-hydroxystearate remained unaltered. Although quantitative data of the compounds formed after digestion were not obtained, methyl 9,10-dihydroxystearate was detected after digestion of methyl 9,10-epoxystearate, and some major volatiles were detected after digestion of linoleate hydroperoxides. Overall, the results showed that significant modifications of dietary oxidized lipids occurred during gastric digestion and supported that the low pH of the gastric fluid played an important role.
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Affiliation(s)
- Gloria Márquez-Ruiz
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición, Consejo Superior de Investigaciones Científicas (ICTAN-CSIC), 28040 Madrid, Spain;
- Correspondence:
| | - Francisca Holgado
- Instituto de Ciencia y Tecnología de Alimentos y Nutrición, Consejo Superior de Investigaciones Científicas (ICTAN-CSIC), 28040 Madrid, Spain;
| | - María Victoria Ruiz-Méndez
- Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (IG-CSIC), 41089 Sevilla, Spain; (M.V.R.-M.); (J.V.)
| | - Joaquín Velasco
- Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (IG-CSIC), 41089 Sevilla, Spain; (M.V.R.-M.); (J.V.)
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Farag MA, Elimam DM, Afifi SM. Outgoing and potential trends of the omega-3 rich linseed oil quality characteristics and rancidity management: A comprehensive review for maximizing its food and nutraceutical applications. Trends Food Sci Technol 2021; 114:292-309. [DOI: 10.1016/j.tifs.2021.05.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Grossmann L, Kinchla AJ, Nolden A, McClements DJ. Standardized methods for testing the quality attributes of plant-based foods: Milk and cream alternatives. Compr Rev Food Sci Food Saf 2021; 20:2206-2233. [PMID: 33547726 DOI: 10.1111/1541-4337.12718] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/27/2020] [Accepted: 01/10/2021] [Indexed: 12/13/2022]
Abstract
The food industry is creating a diverse range of plant-based alternatives to dairy products, such as milks, creams, yogurts, and cheeses due to the increasing demand from consumers for more sustainable, healthy, and ethical products. These dairy alternatives are often designed to mimic the desirable physicochemical, functional, and sensory properties of real dairy products, such as their appearance, texture, mouthfeel, flavor, and shelf-life. At present, there is a lack of systematic testing methods to characterize the properties of plant-based dairy alternatives. The purpose of this review is to critically evaluate existing methods and recommend a series of standardized tests that could be used to quantify the properties of fluid plant-based milk alternatives (milk and cream). These methods could then be used to facilitate the design of milk alternatives with somewhat similar attributes as real dairy milk by comparing their properties under standardized conditions. Moreover, they could be used to facilitate comparison of the properties of milk alternatives developed in different laboratories.
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Affiliation(s)
- Lutz Grossmann
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts
| | - Amanda J Kinchla
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts
| | - Alissa Nolden
- Department of Food Science, University of Massachusetts, Amherst, Massachusetts
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Alberdi-Cedeño J, Ibargoitia ML, Guillén MD. Study of the In Vitro Digestion of Olive Oil Enriched or Not with Antioxidant Phenolic Compounds. Relationships between Bioaccessibility of Main Components of Different Oils and Their Composition. Antioxidants (Basel) 2020; 9:antiox9060543. [PMID: 32575754 PMCID: PMC7346224 DOI: 10.3390/antiox9060543] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/11/2020] [Accepted: 06/17/2020] [Indexed: 12/13/2022] Open
Abstract
The changes provoked by in vitro digestion in the lipids of olive oil enriched or not with different phenolic compounds were studied by proton nuclear magnetic resonance (1H NMR) and solid phase microextraction followed by gas chromatography/mass spectrometry (SPME-GC/MS). These changes were compared with those provoked in the lipids of corn oil and of virgin flaxseed oil submitted to the same digestive conditions. Lipolysis and oxidation were the two reactions under consideration. The bioaccessibility of main and minor components of olive oil, of phenolic compounds added, and of compounds formed as consequence of the oxidation, if any, were matters of attention. Enrichment of olive oil with antioxidant phenolic compounds does not affect the extent of lipolysis, but reduces the oxidation degree to minimum values or avoids it almost entirely. The in vitro bioaccessibility of nutritional and bioactive compounds was greater in the olive oil digestate than in those of other oils, whereas that of compounds formed in oxidation was minimal, if any. Very close quantitative relationships were found between the composition of the oils in main components and their in vitro bioaccessibility. These relationships, some of which have predictive value, can help to design lipid diets for different nutritional purposes.
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