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Böhm W, Zinke L, Rehle AK, Henle T. Role of Proteins in the Formation of Melanoidins during Coffee Roasting. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:18499-18509. [PMID: 37962901 DOI: 10.1021/acs.jafc.3c05425] [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: 11/15/2023]
Abstract
The objective of the study was to investigate structural changes in the protein-rich, high-molecular-weight fraction of coffee during roasting and their contribution to the melanoidin formation in the course of the Maillard reaction. For this purpose, high- and low-molecular-weight fractions of one raw and five coffee beans with an increased roasting degree were analyzed in terms of general (color, molecular weight, functionality, elemental composition) and specific parameters (amino acid composition, Maillard reaction products). It could be demonstrated that the high -molecular-weight fraction undergoes significant changes during roasting, where proteins appear to play an important role in melanoidin formation due to their diverse nucleophilic side chains. Modification of the amino acid side chains with known Maillard reaction products (MRPs) occurs in the early stages of roasting and decreases rapidly as color development progresses. The decrease suggests that MRPs are involved in further reactions and thus extend the functionality of the amino acid side chains, opening further possibilities for protein modification. Overall, the large number of reaction pathways leads to the formation of a well-mixed, continuous melanoidin spectrum covering a wide range of molecular masses. In this process, cross-linking and fragmentation reactions oppose each other, leading to an approximation of the molecular weight.
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Affiliation(s)
- Wendelin Böhm
- Chair of Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
| | - Lucas Zinke
- 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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2
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Thierig M, Siegel E, Henle T. Formation of Protein-Bound Maillard Reaction Products during the Storage of Manuka Honey. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:15261-15269. [PMID: 37796058 DOI: 10.1021/acs.jafc.3c03446] [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: 10/06/2023]
Abstract
Honey from the nectar of the Manuka tree (Leptospermum scoparium) grown in New Zealand contains high amounts of antibacterial methylglyoxal (MGO). MGO can react with proteins to form peptide-bound Maillard reaction products (MRPs) such as Nε-carboxyethyllysine (CEL) and "methylglyoxal-derived hydroimidazolone 1" (MG-H1). To study the reactions of MGO with honey proteins during storage, three manuka honeys with varying amounts of MGO and a kanuka honey (Kunzea ericoides) spiked with various MGO concentrations up to 700 mg/kg have been stored at 37 °C for 10 weeks, and the formation of protein-bound MRPs has been analyzed via high-performance liquid chromatography-mass spectrometry (HPLC-MS/MS) following isolation of the protein fraction and enzymatic hydrolysis. During storage, contents of protein-bound CEL and MG-H1 increased continuously, directly depending on the MGO content. For honeys with large amounts of MGO, a slower formation of Nε-fructosyllysine (FL) was observed, indicating competing reactions of glucose and MGO with lysine. Furthermore, the lysine modification increased with storage independently from the MGO concentration. Up to 58-61% of the observed lysine modification was explainable with the formation of CEL and FL, indicating that other reactions, most likely the formation of Heyns products from lysine and fructose, may play an important role. Our results can contribute to the authentication of manuka honey.
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Affiliation(s)
- Marcus Thierig
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Eva Siegel
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Thomas Henle
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
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3
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Bell AR, Grainger MNC. Accelerated loss of diastase in mānuka honey: Investigation of mānuka specific compounds. Food Chem 2023; 426:136614. [PMID: 37329801 DOI: 10.1016/j.foodchem.2023.136614] [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: 12/01/2022] [Revised: 04/19/2023] [Accepted: 06/10/2023] [Indexed: 06/19/2023]
Abstract
Diastase is used internationally as a quality monitor for excessive heat treatment and prolonged storage of honey; honey must contain an activity of at least 8 diastase numbers (DN) for it to be considered export quality. Freshly harvested mānuka honey can have diastase activity close to the export threshold of 8 DN without excess heating, increasing susceptibility for export failure. This research investigated the effect of compounds unique to or high in concentration in mānuka honey on diastase activity. Investigation of the effect of methylglyoxal, dihydroxyacetone, 2-methoxybenzoic acid, 3-phenyllatic acid, 4-hydroxyphenyllactic acid and 2'-methoxyacetophenone on diastase activity was carried out. Mānuka honey was stored at 20 and 27 °C and clover honey spiked with compounds of interest were stored at 20, 27 and 34 °C and monitored overtime. Methylglyoxal and 3-phenyllactic acid were found to accelerate the loss of diastase above the loss normally observed with time and elevated temperature.
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Affiliation(s)
- Amber R Bell
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand
| | - Megan N C Grainger
- School of Science, University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand.
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4
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Yan S, Zhang M, Yuan Y, Mu G, Xu H, Zhao T, Wang Y, Xue X. Chaste honey in long term-storage: Occurrence and accumulation of Maillard reaction products, and safety assessment. Food Chem 2023; 424:136457. [PMID: 37247601 DOI: 10.1016/j.foodchem.2023.136457] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 05/09/2023] [Accepted: 05/22/2023] [Indexed: 05/31/2023]
Abstract
Honey, a natural sweetener that can be stored long-term, is prone to Maillard reactions. Maillard reaction products (MRPs), such as 5-hydroxymethylfurfural (5-HMF), α-dicarbonyl compounds (α-DCs), and advanced glycation end products (AGEs), negatively affect human health. We analyzed MRP accumulation in chaste honey over four years. In the first year, α-DCs were dominant with total contents of 509.7 mg/kg. In the second year, Amadori compounds increased, accounting for the largest percentage. Their formation at the initial stage showed inhibition of the Maillard reaction over time. AGE contents were approximately 1.00 mg/kg over four years, which is negligible compared to other foods. Increased 5-HMF was significantly correlated with storage time (p < 0.01), making it a suitable indicator of honey quality. Due to the lack of MRP risk assessments, we compared our findings with daily intake of MRPs from other foods, and the levels of MRPs in honey over four years are acceptable.
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Affiliation(s)
- Sha Yan
- College of Food Science and Engineering, Shanxi Agricultural University, Taigu 030801, China; State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Min Zhang
- State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Yuzhe Yuan
- State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Guodong Mu
- State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Haitao Xu
- State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Tian Zhao
- Animal Husbandry and Veterinary Medicine Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550005, China
| | - Yinchen Wang
- Animal Husbandry and Veterinary Medicine Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550005, China.
| | - Xiaofeng Xue
- State Key Laboratory of Resource Insects, Institute of Apiculture Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China.
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5
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Bong J, Middleditch M, Stephens JM, Loomes KM. Proteomic Analysis of Honey: Peptide Profiling as a Novel Approach for New Zealand Mānuka ( Leptospermum scoparium) Honey Authentication. Foods 2023; 12:foods12101968. [PMID: 37238786 DOI: 10.3390/foods12101968] [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: 03/28/2023] [Revised: 05/08/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
New Zealand mānuka (Leptospermum scoparium) honey is a premium food product. Unfortunately, its high demand has led to "not true to label" marketed mānuka honey. Robust methods are therefore required to determine authenticity. We previously identified three unique nectar-derived proteins in mānuka honey, detected as twelve tryptic peptide markers, and hypothesized these could be used to determine authenticity. We invoked a targeted proteomic approach based on parallel reaction-monitoring (PRM) to selectively monitor relative abundance of these peptides in sixteen mānuka and twenty six non-mānuka honey samples of various floral origin. We included six tryptic peptide markers derived from three bee-derived major royal jelly proteins as potential internal standards. The twelve mānuka-specific tryptic peptide markers were present in all mānuka honeys with minor regional variation. By comparison, they had negligible presence in non-mānuka honeys. Bee-derived peptides were detected in all honeys with similar relative abundance but with sufficient variation precluding their utility as internal standards. Mānuka honeys displayed an inverse relationship between total protein content and the ratio between nectar- to bee-derived peptide abundance. This trend reveals an association between protein content on possible nectar processing time by bees. Overall, these findings demonstrate the first successful application of peptide profiling as an alternative and potentially more robust approach for mānuka honey authentication.
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Affiliation(s)
- Jessie Bong
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, Auckland 1010, New Zealand
| | - Martin Middleditch
- Mass Spectrometry Facility, Faculty of Science, University of Auckland, Auckland 1010, New Zealand
| | - Jonathan M Stephens
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, Auckland 1010, New Zealand
- Comvita NZ Limited, Wilson South Road, Paengaroa, PB1, Te Puke 3119, New Zealand
| | - Kerry M Loomes
- School of Biological Sciences and Institute for Innovation in Biotechnology, University of Auckland, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, Auckland 1010, New Zealand
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Thierig M, Raupbach J, Wolf D, Mascher T, Subramanian K, Henle T. 3-Phenyllactic Acid and Polyphenols Are Substances Enhancing the Antibacterial Effect of Methylglyoxal in Manuka Honey. Foods 2023; 12:foods12051098. [PMID: 36900615 PMCID: PMC10000891 DOI: 10.3390/foods12051098] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/03/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023] Open
Abstract
Manuka honey is known for its unique antibacterial activity, which is due to methylglyoxal (MGO). After establishing a suitable assay for measuring the bacteriostatic effect in a liquid culture with a time dependent and continuous measurement of the optical density, we were able to show that honey differs in its growth retardingeffect on Bacillus subtilis despite the same content of MGO, indicating the presence of potentially synergistic compounds. In model studies using artificial honey with varying amounts of MGO and 3-phenyllactic acid (3-PLA), it was shown that 3-PLA in concentrations above 500 mg/kg enhances the bacteriostatic effect of the model honeys containing 250 mg/kg MGO or more. It has been shown that the effect correlates with the contents of 3-PLA and polyphenols in commercial manuka honey samples. Additionally, yet unknown substances further enhance the antibacterial effect of MGO in manuka honey. The results contribute to the understanding of the antibacterial effect of MGO in honey.
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Affiliation(s)
- Marcus Thierig
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Jana Raupbach
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbrücke (DIfE), D-14558 Nuthetal, Germany
| | - Diana Wolf
- Chair of General Microbiology, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Thorsten Mascher
- Chair of General Microbiology, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Kannan Subramanian
- Manuka Health New Zealand Limited, 66 Weona Court, Te Awamutu 3800, New Zealand
| | - Thomas Henle
- Chair of Food Chemistry, Technische Universität Dresden, D-01062 Dresden, Germany
- Correspondence:
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7
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Truong HTD, Reddy P, Reis MM, Archer R. Quality assessment of mānuka honeys using non-invasive Near Infrared systems. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.104780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Amino acids and glycation compounds in hot trub formed during wort boiling. Eur Food Res Technol 2022. [DOI: 10.1007/s00217-022-04138-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractThe aim of this study was to investigate the amino acid composition and the amount of individual glycation compounds in hot trub formed during boiling of wort prepared from different malts. Compared to the initial amino acid composition of the used malts, some Maillard reaction products (namely MG-H1, pyrraline) and hydrophobic amino acids (leucine, isoleucine, valine, phenylalanine) accumulated in the hot trub, whereas hydrophilic amino acids remained in the boiled wort. For MG-H1, a threefold increase was observed during wort boiling, whereas the other Maillard reaction products, namely CML, CEL, pyrraline and maltosine increased only slightly (1.1–2-fold). Furosine as a hallmark for peptide-bound Amadori compounds showed a small decrease. The results suggest that mainly glycated amino acids derived from small dicarbonyl compounds such as methylglyoxal and glyoxal are formed during wort boiling. Furthermore, the studies indicate that the modification of the protein structure as a result of the Maillard reaction has an influence on the hydration of the denatured proteins during the wort boiling process, thus affecting the coagulation process and, therefore, precipitation of the hot trub. The work carried out contributes to the understanding of the chemical reactions influencing the amino acid and Maillard reaction product transfer from malt to beer.
Graphical abstract
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9
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Alaerjani WMA, Abu-Melha S, Alshareef RMH, Al-Farhan BS, Ghramh HA, Al-Shehri BMA, Bajaber MA, Khan KA, Alrooqi MM, Modawe GA, Mohammed MEA. Biochemical Reactions and Their Biological Contributions in Honey. Molecules 2022; 27:molecules27154719. [PMID: 35897895 PMCID: PMC9331712 DOI: 10.3390/molecules27154719] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/18/2022] [Accepted: 07/18/2022] [Indexed: 11/30/2022] Open
Abstract
Honey is known for its content of biomolecules, such as enzymes. The enzymes of honey originate from bees, plant nectars, secretions or excretions of plant-sucking insects, or from microorganisms such as yeasts. Honey can be characterized by enzyme-catalyzed and non-enzymatic reactions. Notable examples of enzyme-catalyzed reactions are the production of hydrogen peroxide through glucose oxidase activity and the conversion of hydrogen peroxide to water and oxygen by catalase enzymes. Production of hydroxymethylfurfural (HMF) from glucose or fructose is an example of non-enzymatic reactions in honey.
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Affiliation(s)
- Wed Mohammed Ali Alaerjani
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia; (R.M.H.A.); (M.A.B.)
- Correspondence: (W.M.A.A.); (M.E.A.M.)
| | - Sraa Abu-Melha
- Department of Chemistry, Faculty of Girls for Science, King Khalid University, Abha 61413, Saudi Arabia; (S.A.-M.); (B.S.A.-F.); (B.M.A.A.-S.)
| | | | - Badriah Saad Al-Farhan
- Department of Chemistry, Faculty of Girls for Science, King Khalid University, Abha 61413, Saudi Arabia; (S.A.-M.); (B.S.A.-F.); (B.M.A.A.-S.)
| | - Hamed A. Ghramh
- Unit of Honeybee Research and Honey Production, King Khalid University, Abha 61413, Saudi Arabia; (H.A.G.); (K.A.K.)
- Research Center for Material Science, King Khalid University, Abha 61413, Saudi Arabia
- Department of Biology, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Badria Mohammed Abdallah Al-Shehri
- Department of Chemistry, Faculty of Girls for Science, King Khalid University, Abha 61413, Saudi Arabia; (S.A.-M.); (B.S.A.-F.); (B.M.A.A.-S.)
- Unit of Honeybee Research and Honey Production, King Khalid University, Abha 61413, Saudi Arabia; (H.A.G.); (K.A.K.)
- Research Center for Material Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Majed A. Bajaber
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia; (R.M.H.A.); (M.A.B.)
| | - Khalid Ali Khan
- Unit of Honeybee Research and Honey Production, King Khalid University, Abha 61413, Saudi Arabia; (H.A.G.); (K.A.K.)
- Research Center for Material Science, King Khalid University, Abha 61413, Saudi Arabia
- Department of Biology, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
| | - Munira M. Alrooqi
- Department of Chemistry, Faculty of Applied Science, Umm Al Qura University, Makkah 24382, Saudi Arabia;
| | - Gad Allah Modawe
- Biochemistry Department, Faculty of Medicine and Health Sciences, Omdurman Islamic University, Omdurman 14415, Sudan;
| | - Mohammed Elimam Ahamed Mohammed
- Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia; (R.M.H.A.); (M.A.B.)
- Unit of Honeybee Research and Honey Production, King Khalid University, Abha 61413, Saudi Arabia; (H.A.G.); (K.A.K.)
- Research Center for Material Science, King Khalid University, Abha 61413, Saudi Arabia
- Correspondence: (W.M.A.A.); (M.E.A.M.)
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10
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Yan S, Wang X, Wang W, Peng W, Wang K, Huang J, Wu L, Tian W, Xue X. Identification of Pigmented Substances in Black Honey from Leucosceptrum canum: Novel Quinonoids Contribute to Honey Color. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:3521-3528. [PMID: 35274941 DOI: 10.1021/acs.jafc.1c07885] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Leucosceptrum canum (Lamiaceae) honey (LCH) is a rare and high-value honey with an unusual dark brown color. Its pigments may be related to the purported health benefits of the honey and could serve as indicators of authentic LCH. Here, we purified the pigmented substances contributing to LCH's color and identified them using high-resolution mass spectrometry and nuclear magnetic resonance spectroscopy. The major pigmented substances were 1-[4-(3-carboxy-propylamino)-3,6-dioxo-cyclohexa-1,4-dienyl]-pyrrolidine-2-carboxylic acid (GPBQ), 1-[4-(3-carboxy-propylamino)-3,6-dioxo-cyclohexa-1,4-dienyl]-pyrrolidine-2-carboxylic acid. (GAPBQ), and 2,5-di-(N-prolyl)-para-benzoquinone (DPBQ). According to UHPLC-DAD data recorded at 370 nm, GPBQ, GAPBQ, and DPBQ contents ranged from 2.58 to 5.13, 2.93 to 4.96, and 4.26 to 9.22 mg/kg, respectively. These amino acid-quinone conjugates, found here for the first time, are pigments that can serve as markers to control the quality of LCH.
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Affiliation(s)
- Sha Yan
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
- College of Food Science and Engineering, Shanxi Agricultural University, Taigu 030801, China
| | - Xuan Wang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Wenqian Wang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Wenjun Peng
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Kai Wang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Jiaxing Huang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Liming Wu
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Wenlin Tian
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
| | - Xiaofeng Xue
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100093, China
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11
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Influence of rye bran heteropolysaccharides on the physicochemical and antioxidant properties of honeydew honey microcapsules. FOOD AND BIOPRODUCTS PROCESSING 2021. [DOI: 10.1016/j.fbp.2021.09.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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12
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Yuan X, Nie C, Liu H, Ma Q, Peng B, Zhang M, Chen Z, Li J. Comparison of metabolic fate, target organs, and microbiota interactions of free and bound dietary advanced glycation end products. Crit Rev Food Sci Nutr 2021:1-22. [PMID: 34698575 DOI: 10.1080/10408398.2021.1991265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Increased intake of Western diets and ultra-processed foods is accompanied by increased intake of advanced glycation end products (AGEs). AGEs can be generated exogenously in the thermal processing of food and endogenously in the human body, which associated with various chronic diseases. In food, AGEs can be divided into free and bound forms, which differ in their bioavailability, digestion, absorption, gut microbial interactions and untargeted metabolites. We summarized the measurements and contents of free and bound AGE in foods. Moreover, the ingestion, digestion, absorption, excretion, gut microbiota interactions, and metabolites and metabolic pathways between free and bound AGEs based on animal and human studies were compared. Bound AGEs were predominant in most of the selected foods, while beer and soy sauce were rich in free AGEs. Only 10%-30% of AGEs were absorbed into the systemic circulation when orally administered. The excretion of ingested free and bound AGEs was approximately 90% and 60%, respectively. Dietary free CML has a detrimental effect on gut microbiota composition, while bound AGEs have both detrimental and beneficial impacts. Free and bound dietary AGEs changed amino acid metabolism, energy metabolism and carbohydrate metabolism. And besides, bound dietary AGEs altered vitamin metabolism, and glycerolipid metabolism.
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Affiliation(s)
- Xiaojin Yuan
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Chenxi Nie
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Huicui Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Qingyu Ma
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Bo Peng
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Min Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Zhifei Chen
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Juxiu Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
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13
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Qi H, Zhang Z, Zhang X, Li B, Li L. Two Dipeptide-Bound Pyrralines with Ile or Ala: A Study on Their Synthesis, Transport across Caco-2 Cell Monolayers, and Interaction with Aminopeptidase N. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:10962-10973. [PMID: 34493043 DOI: 10.1021/acs.jafc.1c03773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this study, pyrralylisoleucine (Pyrr-Ile) and pyrralylalanine (Pyrr-Ala), two dipeptide-bound pyrralines with different C-termini were synthesized as the representatives of dietary advanced glycation end products (dAGEs). The structures of Pyrr-Ile and Pyrr-Ala were characterized by high-resolution mass spectrometry, nuclear magnetic resonance, and Fourier transform infrared spectroscopy. Then, the transport of Pyrr-Ile and Pyrr-Ala across intestinal epithelial cells was investigated using Caco-2 cell monolayers, and their interaction with aminopeptidase N (APN) was analyzed. The results showed that the apparent permeability coefficient (Papp) of Pyrr-Ala was (14.1 ± 2.26) × 10-7 cm·s-1 calculated by free pyrraline, while the Papp values of Pyrr-Ile were (32.4 ± 5.35) × 10-7 and (19.1 ± 1.46) × 10-7 cm·s-1 when they were, respectively, calculated according to their dipeptide-bound or free form. Both Pyrr-Ala and Pyrr-Ile were potential substrates of APN, and their hydrolysis by APN may make the intact transmembrane transport of Pyrr-Ala and Pyrr-Ile more difficult, especially for Pyrr-Ala. Besides, the occurrence of product inhibition in hydrolysis of Pyrr-Ile was possible. Pyrr-Ile and Pyrr-Ala were different in Papp values and transport forms, which suggested that the C-terminus may play an important role in their transport across the Caco-2 cell monolayers. In addition, the results highlight the intact transmembrane transport of dipeptide-bound pyrraline.
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Affiliation(s)
- Haiping Qi
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Ministry of Education Engineering Research Center of Starch & Protein Processing, South China University of Technology, Guangzhou 510640, China
| | - Zhenhui Zhang
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Ministry of Education Engineering Research Center of Starch & Protein Processing, South China University of Technology, Guangzhou 510640, China
| | - Xia Zhang
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Ministry of Education Engineering Research Center of Starch & Protein Processing, South China University of Technology, Guangzhou 510640, China
| | - Bing Li
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Ministry of Education Engineering Research Center of Starch & Protein Processing, South China University of Technology, Guangzhou 510640, China
| | - Lin Li
- School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Ministry of Education Engineering Research Center of Starch & Protein Processing, South China University of Technology, Guangzhou 510640, China
- School of Chemical Engineering and Energy Technology, Dongguan University of Technology, College Road 1, Dongguan 523808, China
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14
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Akıllıoğlu HG, Lund MN. Quantification of advanced glycation end products and amino acid cross-links in foods by high-resolution mass spectrometry: Applicability of acid hydrolysis. Food Chem 2021; 366:130601. [PMID: 34298391 DOI: 10.1016/j.foodchem.2021.130601] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 07/08/2021] [Accepted: 07/12/2021] [Indexed: 11/17/2022]
Abstract
An analytical method was developed and validated for simultaneous identification and quantification of advanced glycation end products (AGEs), amino acid cross-links, lysine and arginine in foodstuffs based on acid hydrolysis, hydrophilic interaction chromatography and high-resolution mass spectrometry. The method proved to be sensitive, reproducible and accurate for furosine, N-Ɛ-(carboxymethyl)lysine, N-Ɛ-(carboxyethyl)lysine, methylglyoxal and glyoxal-derived hydroimidazolones (MG-H and GO-H isomers, respectively), glyoxal lysine dimer, lysinoalanine, lanthionine, lysine and arginine. LOD and LOQ values in water were found to be 0.9-15.5 ng/mL and 2.8-47 ng/mL, respectively, and increased to 1.4-60 ng/mL and 4.4-182 ng/mL in liquid infant formula. Recovery values ranged from 76 to 118% in four different food matrices. Microwave-assisted hydrolysis for 11 min had similar efficiency as conventional hydrolysis, which requires overnight incubation. Acid stability of each compound was determined during microwave and conventional hydrolysis, and showed that the MG-H1 isomer is partially converted to the MG-H3 isomer during acid hydrolysis.
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Affiliation(s)
- Halise Gül Akıllıoğlu
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
| | - Marianne N Lund
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark; Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark.
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15
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Detection of acacia honey adulteration with high fructose corn syrup through determination of targeted α‑Dicarbonyl compound using ion mobility-mass spectrometry coupled with UHPLC-MS/MS. Food Chem 2021; 352:129312. [PMID: 33652193 DOI: 10.1016/j.foodchem.2021.129312] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/16/2020] [Accepted: 01/02/2021] [Indexed: 12/27/2022]
Abstract
High-value acacia honey is often adulterated with inexpensive high fructose corn syrup (HFCS), due to their similar color and sugar composition. α‑Dicarbonyl compounds formed by Maillard reaction or caramelization during heat treatment or storage, differ between HFCS and honey due to differences in starting materials and processing methods. In this study, we compared α-dicarbonyl compounds in acacia honey and HFCS by Ion Mobility-Mass Spectrometry and multivariate statistical analysis. Through α-dicarbonyl compound derivatization with o-phenylenediamine, we screened a marker with 189.1023 m/z and 139.3 Å2 Collision Cross-Section that can distinguish HFCS from acacia honey. Nuclear magnetic resonance spectra identified this marker compound as 3,4-dideoxypentosulose. We then used chromatography-coupled tandem mass spectrometry to quantitate 3,4-dideoxypentosulose in market samples of honey and HFCS and found that 3,4-dideoxypentosulose was negligible (<0.098 mg/kg) in honey, but prevalent in HFCS (≧1.174 mg/kg), indicating 3,4-dideoxypentosulose can serve as an alternative indicator of HFCS adulteration of acacia honey.
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16
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Kato Y, Kishi Y, Okano Y, Kawai M, Shimizu M, Suga N, Yakemoto C, Kato M, Nagata A, Miyoshi N. Methylglyoxal binds to amines in honey matrix and 2'-methoxyacetophenone is released in gaseous form into the headspace on the heating of manuka honey. Food Chem 2020; 337:127789. [PMID: 32795863 DOI: 10.1016/j.foodchem.2020.127789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 07/31/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022]
Abstract
Reports on the thermal stability of manuka honey in terms of food processing have been few. This study investigated changes in nine characteristic chemicals of manuka honey during heating. Among these, methylglyoxal (MGO) and 2'-methoxyacetophenone (MAP) were significantly decreased by heating at 90 °C. To elucidate the mechanism for this decrease, artificial honey was prepared from sugars and water with MAP or MGO and then heated. The decrease of MGO was enhanced with l-proline, lysine, or arginine derivatives, accompanied by formation of 2-acetyl-1-pyrroline, MGO-derived lysine dimer, or argpyrimidine, respectively, suggesting that an amino-carbonyl reaction is one pathway for the loss of MGO. The decrease of MAP in the artificial honey depended on the volume of headspace in a vessel. MAP from heated manuka honey was also detected in the gas phase, indicating that MAP was vaporized. Heating could thus reduce the beneficial and/or signature molecules in honey.
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Affiliation(s)
- Yoji Kato
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan; Research Institute for Food and Nutritional Sciences, University of Hyogo, Himeji, Hyogo 670-0092, Japan.
| | - Yui Kishi
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Yayako Okano
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Masaki Kawai
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Michiyo Shimizu
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Naoko Suga
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Chisato Yakemoto
- School of Human Science and Environment, University of Hyogo, Himeji, Hyogo 670-0092, Japan
| | - Mai Kato
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Akika Nagata
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Noriyuki Miyoshi
- School of Food and Nutritional Sciences, University of Shizuoka, Yada, Suruga-ku, Shizuoka 422-8526, Japan
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17
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Chernyshev A, Braggins T. Investigation of Temporal Apparent C4 Sugar Change in Manuka Honey. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:4261-4267. [PMID: 32159341 DOI: 10.1021/acs.jafc.9b06965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
New Zealand manuka honeys are known for their propensity to increase apparent C4 sugar content during storage. Depending on the particular storage regime and the initial content of dihydroxyacetone (DHA) in honey, the ready-to-market product often fails the C4 sugar test because of the above phenomenon. We have used DHA labeled with a radioactive 14C isotope in a set of honeys subject to an incubation experiment. These honeys were analyzed for DHA, methylglyoxal (MG), hydroxymethylfurfural (HMF), apparent C4 sugars, and 14C scintillation counts over a period of 18 months. The major conclusion of this experiment is that neither DHA nor MG is responsible for the δ13C shift in the honey protein extract. There must be some other yet unknown substance of manuka honey, which binds to the protein and causes negative δ13C shift. One identified candidate for such a binding is carbon dioxide.
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Affiliation(s)
- Anatoly Chernyshev
- Analytica Laboratories Ltd., Ruakura Research Centre, 10 Bisley Rd, Hamilton 3240, New Zealand
| | - Terry Braggins
- Analytica Laboratories Ltd., Ruakura Research Centre, 10 Bisley Rd, Hamilton 3240, New Zealand
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18
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Zhang W, Poojary MM, Rauh V, Ray CA, Olsen K, Lund MN. Limitation of Maillard Reactions in Lactose-Reduced UHT Milk via Enzymatic Conversion of Lactose into Galactooligosaccharides during Production. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:3568-3575. [PMID: 32065525 DOI: 10.1021/acs.jafc.9b07824] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Lactose-hydrolyzed (LH) ultrahigh temperature (UHT) processed milk is more prone to Maillard reactions and formation of advanced glycation end products (AGEs) during processing and storage than conventional (CON) UHT milk because of the presence of free galactose and glucose. Commercially available β-d-galactosidases with transgalactosylating activity can incorporate galactose into galactooligosaccharides (GOSs) and potentially limit Maillard reactions in this lactose-reduced GOS-containing milk. The aim of this study was to examine the extent of Maillard reactions in a lactose-reduced GOS milk compared to LH and CON milk after UHT processing. The GOS milk had significant lower levels of lysine- and arginine-derived AGEs compared to LH milk, while their concentrations were similar to those found in CON milk. The total concentration of measured Arg-derived AGEs was similar to the total concentration of Lys-derived AGEs in the three types of milk, indicating that Arg is an important source of AGEs in milks. Interestingly, the GOS milk generated threefold higher concentrations (up to 330 ± 6 μM) of 3-deoxyglucosone (3-DG, a C6 α-dicarbonyl). These results demonstrate that GOS milk could be a potential alternative for LH milk for lactose-intolerant individuals, although further studies are needed to understand the increased formation of 3-DG in GOS-containing milk.
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Affiliation(s)
- Wei Zhang
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Mahesha M Poojary
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Valentin Rauh
- Arla Foods amba, Agro Food Park 19, 8200 Aarhus N, Denmark
| | - Colin A Ray
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Karsten Olsen
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
| | - Marianne N Lund
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark
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19
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Zhao D, Sheng B, Wu Y, Li H, Xu D, Nian Y, Mao S, Li C, Xu X, Zhou G. Comparison of Free and Bound Advanced Glycation End Products in Food: A Review on the Possible Influence on Human Health. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:14007-14018. [PMID: 31789029 DOI: 10.1021/acs.jafc.9b05891] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Debate on the hazards of advanced glycation end products (AGEs) in food has continued for many years as a result of their uncertain bioavailability and ability to bind to their receptors (RAGEs) in vivo. There are increasing evidence that free and bound AGEs have many differences in gastrointestinal digestion, intestinal absorption, binding with RAGEs, in vivo circulation, and renal clearance. Therefore, this paper compares these aspects between free and bound AGEs by summarizing the available knowledge. On the basis of the current knowledge, we conclude that it is time to differentiate free AGEs from bound AGEs in food in future studies, because they vary in many aspects that are closely related to their influence on human health. Several perspectives were proposed at the end of this review for further exploring the difference between free and bound AGEs in food.
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Affiliation(s)
| | - Bulei Sheng
- Department of Food Science , Aarhus University , Blichers Allé 20 , 8830 Tjele , Denmark
| | - Yi Wu
- College of Food Science and Engineering , South China University of Technology , 381 Wushan Road , Tianhe District, Guangzhou , Guangdong 510640 , People's Republic of China
| | | | - Dan Xu
- College of Food Science and Engineering , South China University of Technology , 381 Wushan Road , Tianhe District, Guangzhou , Guangdong 510640 , People's Republic of China
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Manig F, Hellwig M, Pietz F, Henle T. Quantitation of free glycation compounds in saliva. PLoS One 2019; 14:e0220208. [PMID: 31532774 PMCID: PMC6750567 DOI: 10.1371/journal.pone.0220208] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 07/10/2019] [Indexed: 12/14/2022] Open
Abstract
In the course of the Maillard reaction, which occurs during heating of food but also under physiological condition, a broad spectrum of reaction products is formed. Among them, the advanced glycation endproducts (AGEs) Nε-carboxymethyllysine (CML), pyrraline (Pyr), methylglyoxal-derived hydroimidazolone 1 (MG-H1) and Nε-carboxyethyllysine (CEL) are the quantitatively dominating compounds during later reaction stages. Those dietary glycation compounds are under discussion as to be associated with chronic inflammation and the pathophysiological consequences of diseases such as diabetes. In the present study, the concentration of individual glycation compounds in saliva was monitored for the first time and related to their dietary uptake. Fasting saliva of 33 metabolically healthy subjects was analyzed with HPLC-MS/MS. The observed levels of individual glycation compounds ranged from 0.5 to 55.2 ng/ml and differed both intra- and interindividually. Patterns did not correlate with subject-related features such as vegetarianism or sports activities, indicating that dietary intake may play an important role. Therefore, six volunteers were asked to eat a raw food diet free of glycation compounds for two days. Within two days, salivary Pyr was lowered from median 1.7 ng/ml to a minimum level below the limit of detection, and MG-H1 decreased from 3.6 to 1.7 ng/ml in in a time-dependent manner after two days. Salivary CML and CEL concentrations were not affected. Therefore, measuring Pyr and MG-H1 in saliva is a suitable diagnostic tool to monitor the dietary intake and metabolic transit of glycation compounds present in heated foods.
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Affiliation(s)
- Friederike Manig
- Chair of Food Chemistry, Technische Universität Dresden, Dresden, Germany
- * E-mail: (TH); (MH); (FM)
| | - Michael Hellwig
- Chair of Food Chemistry, Technische Universität Dresden, Dresden, Germany
- * E-mail: (TH); (MH); (FM)
| | - Franziska Pietz
- Chair of Food Chemistry, Technische Universität Dresden, Dresden, Germany
| | - Thomas Henle
- Chair of Food Chemistry, Technische Universität Dresden, Dresden, Germany
- * E-mail: (TH); (MH); (FM)
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21
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Kölpin M, Hellwig M. Quantitation of Methionine Sulfoxide in Milk and Milk-Based Beverages-Minimizing Artificial Oxidation by Anaerobic Enzymatic Hydrolysis. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:8967-8976. [PMID: 31334650 DOI: 10.1021/acs.jafc.9b03605] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Protein oxidation in milk products may entail flavor changes through reactions at methionine residues. However, little is known about the extent of methionine oxidation in milk and milk products. In the present study, a method for quantitation of methionine, methionine sulfoxide, and methionine sulfone by a stable isotope dilution assay using HILIC-ESI-MS/MS was established. For the quantitation of protein-bound analytes, anaerobic enzymatic hydrolysis was optimized to suppress artificial methionine oxidation. Moreover, the method allowed for monitoring of artificial oxidation by coincubation of the labeled probe [2H8]methionine. The percentage of oxidized methionine was low in UHT milk (up to 1.6%) and evaporated milk (up to 8.8%), but higher in beverages such as cocoa milk drinks (up to 19.0%) and coffee milk drinks (up to 32.8%), resulting in methionine sulfoxide concentrations of up to 6.7 g/kg protein in the latter. These products are important dietary sources of methionine sulfoxide. Model studies revealed that methionine residues can be oxidized strongly in the presence of phenolic compounds such as catechin, caffeic acid, and gallic acid, which are present in cocoa and coffee and may account for the high extent of oxidation in commercial samples.
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Affiliation(s)
- Martin Kölpin
- Chair of Food Chemistry , Technische Universität Dresden , D-01062 Dresden , Germany
| | - Michael Hellwig
- Chair of Food Chemistry , Technische Universität Dresden , D-01062 Dresden , Germany
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22
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Mohsin GF, Schmitt FJ, Kanzler C, Hoehl A, Hornemann A. PCA-based identification and differentiation of FTIR data from model melanoidins with specific molecular compositions. Food Chem 2019; 281:106-113. [DOI: 10.1016/j.foodchem.2018.12.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 12/10/2018] [Accepted: 12/10/2018] [Indexed: 11/25/2022]
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23
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Hellwig M, Henle T. Isolation and quantification in food of 6-(2-formyl-5-methylpyrrol-1-yl)-l-norleucine (“rhamnolysine”) and its precursor 3,6-dideoxy-l-mannosone. Eur Food Res Technol 2019. [DOI: 10.1007/s00217-019-03238-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Individual Maillard reaction products as indicators of heat treatment of pasta — A survey of commercial products. J Food Compost Anal 2018. [DOI: 10.1016/j.jfca.2018.06.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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25
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Probing Protein Glycation by Chromatography and Mass Spectrometry: Analysis of Glycation Adducts. Int J Mol Sci 2017; 18:ijms18122557. [PMID: 29182540 PMCID: PMC5751160 DOI: 10.3390/ijms18122557] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 11/26/2017] [Accepted: 11/27/2017] [Indexed: 12/14/2022] Open
Abstract
Glycation is a non-enzymatic post-translational modification of proteins, formed by the reaction of reducing sugars and α-dicarbonyl products of their degradation with amino and guanidino groups of proteins. Resulted early glycation products are readily involved in further transformation, yielding a heterogeneous group of advanced glycation end products (AGEs). Their formation is associated with ageing, metabolic diseases, and thermal processing of foods. Therefore, individual glycation adducts are often considered as the markers of related pathologies and food quality. In this context, their quantification in biological and food matrices is required for diagnostics and establishment of food preparation technologies. For this, exhaustive protein hydrolysis with subsequent amino acid analysis is the strategy of choice. Thereby, multi-step enzymatic digestion procedures ensure good recoveries for the most of AGEs, whereas tandem mass spectrometry (MS/MS) in the multiple reaction monitoring (MRM) mode with stable isotope dilution or standard addition represents “a gold standard” for their quantification. Although the spectrum of quantitatively assessed AGE structures is continuously increases, application of untargeted profiling techniques for identification of new products is desired, especially for in vivo characterization of anti-glycative systems. Thereby, due to a high glycative potential of plant metabolites, more attention needs to be paid on plant-derived AGEs.
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Unique fluorescence and high-molecular weight characteristics of protein isolates from manuka honey ( Leptospermum scoparium ). Food Res Int 2017; 99:469-475. [DOI: 10.1016/j.foodres.2017.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/31/2017] [Accepted: 06/02/2017] [Indexed: 11/20/2022]
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