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Doliente JE, Langer S, Dickinson MR, Cubas M, Colonese AC, Penkman K, Craig OE. Alkylresorcinol detection and identification in archaeological pottery using ultra-high-performance liquid chromatography-quadrupole/Orbitrap mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2024; 38:e9771. [PMID: 38778666 DOI: 10.1002/rcm.9771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/26/2024] [Accepted: 04/27/2024] [Indexed: 05/25/2024]
Abstract
RATIONALE Alkylresorcinols (AR) are cereal-specific biomarkers and have recently been found in archaeological pots. However, their low concentrations and high susceptibility to degradation make them difficult to detect using conventional gas chromatography mass spectrometry (GC/MS). Here we describe the development of a more sensitive liquid chromatography mass spectrometry (LC/MS) method to detect these compounds. METHOD A method based on the use of ultra-high-performance liquid chromatography (UHPLC) coupled to an Orbitrap mass analyser was established and validated for the detection of low-concentration ARs in pottery. During the preliminary experiments, UHPLC-Q/Orbitrap MS (ultra-high-performance liquid chromatography-quadrupole/Orbitrap mass spectrometry) was demonstrated to be more sensitive, and a wide range of AR homologues in cereal extracts were detected, unlike UHPLC-QTOFMS (ultra-high-performance liquid chromatography-quadrupole time-of-flight mass spectrometry) and GC/MS. The developed method was utilised to profile AR homologue distribution in modern cereal samples and reanalyse AR-containing pots from the archaeological site of Must Farm. RESULTS A highly sensitive LC/MS method with a limit of detection (LOD) of 0.02 μg/g and a limit of quantification (LOQ) of 0.06 μg/g was used to profile ARs in five modern cereal grains. The obtained LOD is 250 times lower than that obtained using the conventional GC/MS approach. AR 21:0 was the most abundant homologue in all four Triticum spp.-einkorn, emmer, Khorasan wheat and common wheat. Meanwhile, AR 25:0 was the predominant homologue in barley, potentially enabling differentiation between wheat and barley. The developed LC/MS-based method was successfully used to analyse ARs extracted from Must Farm potsherds and identified the cereal species most likely processed in the pots-emmer wheat. CONCLUSION The described method offers an alternative and more sensitive approach for detecting and identifying ARs in ancient pottery. It has been successfully utilised to detect AR homologues in archaeological samples and discriminate which cereal species-wheat and barley-were processed in the pots.
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Affiliation(s)
- Jonica Ella Doliente
- Department of Chemistry, University of York, York, UK
- BioArCh, Department of Archaeology, University of York, York, UK
- Department of Prehistory, Institute of Environmental Science and Technology (ICTA), Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Swen Langer
- Department of Biology, Bioscience Technology Facility, University of York, York, UK
- Centre of Excellence in Mass Spectrometry, University of York, York, UK
| | | | - Miriam Cubas
- Department of History and Philosophy, University of Alcalá, Madrid, Spain
| | - André C Colonese
- Department of Prehistory, Institute of Environmental Science and Technology (ICTA), Universitat Autònoma de Barcelona, Barcelona, Spain
| | | | - Oliver E Craig
- BioArCh, Department of Archaeology, University of York, York, UK
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Hammerschick T, Vetter W. Silver ion chromatography enables the separation of 2-methylalkylresorcinols from alkylresorcinols. J Sep Sci 2023; 46:e2300243. [PMID: 37650347 DOI: 10.1002/jssc.202300243] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/27/2023] [Accepted: 08/05/2023] [Indexed: 09/01/2023]
Abstract
Alkylresorcinols (∑ARs) is the generic term for a highly varied class of lipids found mainly in cereals. These bioactive compounds consist mainly of 5-alkylresorcinols (ARs), which differ in length, unsaturation, and substituents on the alkyl side chain on C-5. In addition, 2-methyl-5-alkylresorcinols (mARs) are scarcely studied minor compounds that are supposed to exist with the same structural diversity. In the first step, ∑ARs were enriched by solid-phase extraction from wheat grain and quinoa seed extracts. The subsequent application of silver ion chromatography (SIC), silica gel, coated with 20% AgNO3 , then deactivated with 1% water) enabled an unprecedented full separation of saturated mARs from conventional ARs. Specifically, saturated mARs were eluted with n-hexane/ethyl acetate (92:8, v/v), and conventional ARs with n-hexane/ethyl acetate (80:20, v/v). The unpreceded separation indicated that the SIC method could be useful not only for separations according to the degree of unsaturation, but also in the case of steric hindrance by additional (alkyl) substituents. Continued fractionation enabled the collection of unsaturated ARs in wheat and quinoa extracts. In this way, 35 ∑ARs (including five mARs) were detected by gas chromatography/mass spectrometry analysis in wheat and 45 ∑ARs (including 21 mARs) in quinoa. These included several low abundant and partly unknown ∑ARs such as 1,3-dihydroxy-5-tricosadienylbenzene.
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Affiliation(s)
- Tim Hammerschick
- Department of Food Chemistry (170b), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany
| | - Walter Vetter
- Department of Food Chemistry (170b), Institute of Food Chemistry, University of Hohenheim, Stuttgart, Germany
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Hammerschick T, Vetter W. Profiling and Isolation of Ten Rare Branched-Chain Alkylresorcinols in Quinoa. Molecules 2023; 28:5220. [PMID: 37446882 DOI: 10.3390/molecules28135220] [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: 05/12/2023] [Revised: 07/02/2023] [Accepted: 07/03/2023] [Indexed: 07/15/2023] Open
Abstract
Alkylresorcinols (∑ARs) are bioactive lipid compounds predominantly found in cereals. These amphiphilic compounds exist in a high structural diversity and can be divided into two main groups, i.e., 5-alkylresorcinols (ARs) and 2-methyl-5-alkylresorcinols (mARs). The pseudocereal quinoa has a very unique AR profile, consisting not only of straight-chain alkyl chains but also iso- and anteiso-branched isomers. Here, we describe a method for the isolation of such methyl-branched ARs and mARs from quinoa. The enrichment of the ∑AR fraction from the lipid extracts by centrifugal partition chromatography (CPC) was followed by ∑AR profiling using countercurrent chromatography (CCC) and GC/MS analysis of CCC fractions. A total of 112 ∑ARs could be detected, 63 of which had not been previously described in quinoa. Due to this high number of ∑ARs, the direct isolation of individual ARs was not possible using conventional CCC. Instead, the more powerful heart-cut mode was applied to enrich the target compounds. A final purification step-the separation of CCC-co-eluting mARs from ARs -was performed via silver ion chromatography. Altogether, ten rare branched-chain ∑ARs (five iso-branched mARs and five anteiso-branched ARs, including mAR19:0-i and AR20:0-a) were isolated with purities up to 98% in the double-digit mg range.
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Affiliation(s)
- Tim Hammerschick
- Institute of Food Chemistry, University of Hohenheim, D-70599 Stuttgart, Germany
| | - Walter Vetter
- Institute of Food Chemistry, University of Hohenheim, D-70599 Stuttgart, Germany
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Noerman S, Virtanen JK, Lehtonen M, Brunius C, Hanhineva K. Serum metabolites associated with wholegrain consumption using nontargeted metabolic profiling: a discovery and reproducibility study. Eur J Nutr 2023; 62:713-726. [PMID: 36198920 PMCID: PMC9941277 DOI: 10.1007/s00394-022-03010-x] [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: 03/21/2022] [Accepted: 09/21/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE To identify fasting serum metabolites associated with WG intake in a free-living population adjusted for potential confounders. METHODS We selected fasting serum samples at baseline from a subset (n = 364) of the prospective population-based Kuopio Ischaemic Heart Disease Risk Factor Study (KIHD) cohort. The samples were analyzed using nontargeted metabolomics with liquid chromatography coupled with mass spectrometry (LC-MS). Association with WG intake was investigated using both random forest followed by linear regression adjusted for age, BMI, smoking, physical activity, energy and alcohol consumption, and partial Spearman correlation adjusted for the same covariates. Features selected by any of these models were shortlisted for annotation. We then checked if we could replicate the findings in an independent subset from the same cohort (n = 200). RESULTS Direct associations were observed between WG intake and pipecolic acid betaine, tetradecanedioic acid, four glucuronidated alkylresorcinols (ARs), and an unknown metabolite both in discovery and replication cohorts. The associations remained significant (FDR<0.05) even after adjustment for the confounders in both cohorts. Sinapyl alcohol was positively correlated with WG intake in both cohorts after adjustment for the confounders but not in linear models in the replication cohort. Some microbial metabolites, such as indolepropionic acid, were positively correlated with WG intake in the discovery cohort, but the correlations were not replicated in the replication cohort. CONCLUSIONS The identified associations between WG intake and the seven metabolites after adjusting for confounders in both discovery and replication cohorts suggest the potential of these metabolites as robust biomarkers of WG consumption.
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Affiliation(s)
- Stefania Noerman
- Division of Food and Nutrition Science, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden. .,Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland.
| | - Jyrki K. Virtanen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland
| | - Marko Lehtonen
- School of Pharmacy, University of Eastern Finland, Kuopio, Finland
| | - Carl Brunius
- Present Address: Division of Food and Nutrition Science, Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Kati Hanhineva
- Department of Life Technologies, Food Chemistry and Food Development Unit, University of Turku, Turku, Finland. .,Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland.
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Clifford MN, King LJ, Kerimi A, Pereira-Caro MG, Williamson G. Metabolism of phenolics in coffee and plant-based foods by canonical pathways: an assessment of the role of fatty acid β-oxidation to generate biologically-active and -inactive intermediates. Crit Rev Food Sci Nutr 2022; 64:3326-3383. [PMID: 36226718 DOI: 10.1080/10408398.2022.2131730] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
ω-Phenyl-alkenoic acids are abundant in coffee, fruits, and vegetables. Along with ω-phenyl-alkanoic acids, they are produced from numerous dietary (poly)phenols and aromatic amino acids in vivo. This review addresses how phenyl-ring substitution and flux modulates their gut microbiota and endogenous β-oxidation. 3',5'-Dihydroxy-derivatives (from alkyl-resorcinols, flavanols, proanthocyanidins), and 4'-hydroxy-phenolic acids (from tyrosine, p-coumaric acid, naringenin) are β-oxidation substrates yielding benzoic acids. In contrast, 3',4',5'-tri-substituted-derivatives, 3',4'-dihydroxy-derivatives and 3'-methoxy-4'-hydroxy-derivatives (from coffee, tea, cereals, many fruits and vegetables) are poor β-oxidation substrates with metabolism diverted via gut microbiota dehydroxylation, phenylvalerolactone formation and phase-2 conjugation, possibly a strategy to conserve limited pools of coenzyme A. 4'-Methoxy-derivatives (citrus fruits) or 3',4'-dimethoxy-derivatives (coffee) are susceptible to hepatic "reverse" hydrogenation suggesting incompatibility with enoyl-CoA-hydratase. Gut microbiota-produced 3'-hydroxy-4'-methoxy-derivatives (citrus fruits) and 3'-hydroxy-derivatives (numerous (poly)phenols) are excreted as the phenyl-hydracrylic acid β-oxidation intermediate suggesting incompatibility with hydroxy-acyl-CoA dehydrogenase, albeit with considerable inter-individual variation. Further investigation is required to explain inter-individual variation, factors determining the amino acid to which C6-C3 and C6-C1 metabolites are conjugated, the precise role(s) of l-carnitine, whether glycine might be limiting, and whether phenolic acid-modulation of β-oxidation explains how phenolic acids affect key metabolic conditions, such as fatty liver, carbohydrate metabolism and insulin resistance.
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Affiliation(s)
- Michael N Clifford
- School of Bioscience and Medicine, University of Surrey, Guildford, UK
- Department of Nutrition, Dietetics and Food, Monash University, Clayton, Australia
| | - Laurence J King
- School of Bioscience and Medicine, University of Surrey, Guildford, UK
| | - Asimina Kerimi
- Department of Nutrition, Dietetics and Food, Monash University, Clayton, Australia
| | - Maria Gema Pereira-Caro
- Department of Food Science and Health, Instituto Andaluz de Investigacion y Formacion Agraria Pesquera Alimentaria y de la Produccion Ecologica, Sevilla, Spain
| | - Gary Williamson
- Department of Nutrition, Dietetics and Food, Monash University, Clayton, Australia
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Agarwal N, Kolba N, Khen N, Even C, Turjeman S, Koren O, Tako E. Quinoa Soluble Fiber and Quercetin Alter the Composition of the Gut Microbiome and Improve Brush Border Membrane Morphology In Vivo ( Gallus gallus). Nutrients 2022; 14:nu14030448. [PMID: 35276807 PMCID: PMC8838577 DOI: 10.3390/nu14030448] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/10/2022] [Accepted: 01/13/2022] [Indexed: 02/06/2023] Open
Abstract
Quinoa (Chenopodium quinoa Willd.), a gluten-free pseudo-cereal, has gained popularity over the last decade due to its high nutritional value. Quinoa is a rich source of proteins, carbohydrates, fibers, tocopherols (Vitamin E), unsaturated fatty acids and a wide range of polyphenols. The study used Gallus gallus intra-amniotic feeding, a clinically validated method, to assess the effects of quinoa soluble fiber (QSF) and quercetin 3-glucoside (Q3G) versus control. Quercetin is a pharmacologically active polyphenol found in quinoa. Six groups (no injection, 18 Ω H2O, 5% inulin, 1% Q3G, 5% QSF, 1% Q3G + 5% QSF) were assessed for their effect on the brush border membrane (BBM) functionality, intestinal morphology and cecal bacterial populations. Our results showed a significant (p < 0.05) improvement in BBM morphology, particularly goblet and Paneth cell numbers, in the group administered with quinoa and quercetin. However, there were no significant changes seen in the expression of the genes assessed both in the duodenum and liver between any of the treatment groups. Furthermore, fibrous quinoa increased the concentration of probiotic L. plantarum populations compared to the control (H2O). In conclusion, quercetin and quinoa fiber consumption has the potential to improve intestinal morphology and modulate the microbiome.
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Affiliation(s)
- Nikita Agarwal
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA; (N.A.); (N.K.); (N.K.)
| | - Nikolai Kolba
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA; (N.A.); (N.K.); (N.K.)
| | - Noa Khen
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA; (N.A.); (N.K.); (N.K.)
| | - Carmel Even
- Azrieli Faculty of Medicine, Bar-Ilan University, Safed 1311502, Israel; (C.E.); (S.T.); (O.K.)
| | - Sondra Turjeman
- Azrieli Faculty of Medicine, Bar-Ilan University, Safed 1311502, Israel; (C.E.); (S.T.); (O.K.)
| | - Omry Koren
- Azrieli Faculty of Medicine, Bar-Ilan University, Safed 1311502, Israel; (C.E.); (S.T.); (O.K.)
| | - Elad Tako
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA; (N.A.); (N.K.); (N.K.)
- Correspondence: ; Tel.: +1-607-255-0884
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7
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Pedrazzani C, Vanara F, Bhandari DR, Bruni R, Spengler B, Blandino M, Righetti L. 5- n-Alkylresorcinol Profiles in Different Cultivars of Einkorn, Emmer, Spelt, Common Wheat, and Tritordeum. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:14092-14102. [PMID: 34793147 PMCID: PMC8640985 DOI: 10.1021/acs.jafc.1c05451] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 11/08/2021] [Accepted: 11/11/2021] [Indexed: 05/25/2023]
Abstract
5-n-Alkylresorcinols (AR) are bioactive compounds found in the edible parts of many cereals. Here, saturated and unsaturated homologues, including the oxidized forms 5-(2'-oxo) AR and their plant metabolites, were profiled by ultrahigh-performance liquid chromatography-ion mobility separation-high-resolution mass spectrometry in 18 cultivars of einkorn, emmer, spelt, common wheat, and tritordeum, cultivated in two consecutive years under uniform agronomic conditions. The average content of AR ranged between 672.5 ± 129.8 and 1408.9 ± 528.0 mg/kg, exceeding 2380 mg/kg in some samples and highlighting a superior content in tritordeum and in modern cultivars with respect to old wheat genotypes. By evaluating the effect of environmental and agronomic factors on the different variables, the harvest year resulted to be always significant, while location and variety influenced AR abundance only for some homologues. Furthermore, the spatial distribution of AR was investigated by mass spectrometry imaging using transversal cross sections of wheat kernels. Our results show that AR homologues are mainly localized in the testa and in the outer pericarp of wheat kernels.
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Affiliation(s)
- Clara Pedrazzani
- Department
of Food and Drug, University of Parma, Parco Area delle Scienze 17/A, Parma 43124, Italy
| | - Francesca Vanara
- Department
of Agricultural, Forest and Food Sciences, University of Torino, Largo Paolo Braccini, 2, Grugliasco 10095, Italy
| | - Dhaka Ram Bhandari
- Institute
of Inorganic and Analytical Chemistry, Justus
Liebig University Giessen, Heinrich-Buff-Ring 17, Giessen 35392, Germany
| | - Renato Bruni
- Department
of Food and Drug, University of Parma, Parco Area delle Scienze 17/A, Parma 43124, Italy
| | - Bernhard Spengler
- Institute
of Inorganic and Analytical Chemistry, Justus
Liebig University Giessen, Heinrich-Buff-Ring 17, Giessen 35392, Germany
| | - Massimo Blandino
- Department
of Agricultural, Forest and Food Sciences, University of Torino, Largo Paolo Braccini, 2, Grugliasco 10095, Italy
| | - Laura Righetti
- Department
of Food and Drug, University of Parma, Parco Area delle Scienze 17/A, Parma 43124, Italy
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Cruz-Tirado JP, Martins JP, Olmos BDF, Condotta R, Kurozawa LE. Impact of glass transition on chemical properties, caking and flowability of soymilk powder during storage. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.03.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Zou Y, Fan F, Fang Y, Li P, Xia J, Shen X, Liu Q, Hu Q. Neuroprotective Effect of Alkylresorcinols from Wheat Bran in HT22 Cells: Correlation with in vitro Antioxidant Activity. EFOOD 2021. [DOI: 10.2991/efood.k.210125.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Đorđević MR, Zlatković DB, Radulović NS. Scilla bifolia
Wax as a Source of Diverse Long‐Chain Resorcinols and Alkane‐1,3‐diols. Chem Biodivers 2020; 18:e2000811. [DOI: 10.1002/cbdv.202000811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/11/2020] [Indexed: 01/30/2023]
Affiliation(s)
- Miljana R. Đorđević
- Department of Chemistry, Faculty of Sciences and Mathematics University of Niš Višegradska 33 18000 Niš Serbia
| | - Dragan B. Zlatković
- Department of Chemistry, Faculty of Sciences and Mathematics University of Niš Višegradska 33 18000 Niš Serbia
| | - Niko S. Radulović
- Department of Chemistry, Faculty of Sciences and Mathematics University of Niš Višegradska 33 18000 Niš Serbia
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11
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Countercurrent chromatographic fractionation followed by gas chromatography/mass spectrometry identification of alkylresorcinols in rye. Anal Bioanal Chem 2020; 412:8417-8430. [PMID: 33037907 PMCID: PMC7680747 DOI: 10.1007/s00216-020-02980-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/24/2020] [Accepted: 09/29/2020] [Indexed: 11/06/2022]
Abstract
Alkylresorcinols (5-alkyl-1,3-dihydroxybenzenes, ARs) are bioactive phenolic lipid compounds which are particularly abundant in rye and partly other cereals. In this study on ARs, whole rye grain extracts were gained with cyclohexane/ethyl acetate (46/54, w/w). Silylated extracts were used to develop a gas chromatography with mass spectrometry method in the selected ion monitoring mode (GC/MS-SIM) for the sensitive detection of conventional ARs along with keto-substituted (oxo-AR) and ring-methylated ARs (mAR) with 5-alkyl chain lengths of 14 to 27 carbon atoms and 0 to 4 double bonds in one run. Analysis was performed by countercurrent chromatographic (CCC) fractionation using the solvent system n-hexane/ethyl acetate/methanol/water (9/1/9/1, v/v/v/v). Subsequent GC/MS-(SIM) analysis of 80 silylated CCC fractions enabled the detection of 74 ARs in the sample. The CCC elution of the ARs followed the equivalent chain length (ECL) rule in which one double bond compensated the effect of two (additional) carbon atoms. Novel or rarely reported ARs were detected in virtually all classes, i.e. saturated AR (AR14:0), even-numbered monounsaturated AR isomers (AR16:1-AR26:1), triunsaturated ARs (AR25:3), oxo-ARs (AR17:0 oxo, AR19:1 oxo, AR21:2 oxo, AR23:2 oxo) and odd-numbered methyl-ARs (mAR15:0-mAR23:0). Positions of the double bonds of monounsaturated ARs and oxo-ARs were determined with the help of dimethyl disulfide (DMDS) derivatives. Graphical abstract ![]()
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Chemical Characterization and Bioaccessibility of Bioactive Compounds from Saponin-Rich Extracts and Their Acid-Hydrolysates Obtained from Fenugreek and Quinoa. Foods 2020; 9:foods9091159. [PMID: 32839396 PMCID: PMC7555840 DOI: 10.3390/foods9091159] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/18/2020] [Accepted: 08/20/2020] [Indexed: 01/17/2023] Open
Abstract
Saponin-rich extracts from edible seeds have gained increasing interest and their hydrolysis to sapogenin-rich extracts may be an effective strategy to enhance their potential bioactivity. However, it remains necessary to study the resulting chemical modifications of the extracts after hydrolysis as well as their impact on the subsequent bioaccessibility of bioactive compounds. The chemical composition of non-hydrolyzed and hydrolyzed extracts from fenugreek (FE, HFE) and quinoa (QE, HQE), and the bioaccessibility of saponins, sapogenins and other bioactive compounds after an in vitro gastrointestinal digestion was assessed. In general, FE mainly contained saponins (31%), amino acids (6%) and glycerides (5.9%), followed by carbohydrates (3.4%), fatty acids (FFA) (2.3%), phytosterols (0.8%), tocols (0.1%) and phenolics (0.05%). HFE consisted of FFA (35%), sapogenins (8%) and partial glycerides (7%), and were richer in phytosterols (1.9%) and tocols (0.3%). QE mainly contained glycerides (33%), FFA (19%), carbohydrates (16%) and saponins (7.9%), and to a lesser extent alkylresorcinols (1.8%), phytosterols (1.5%), amino acids (1.1%), tocols (0.5%) and phenolics (0.5%). HQE mainly consisted of FFA (57%), partial glycerides (23%) and sapogenins (5.4%), were richer in phytosterols (2.4%), phenolics (1.2%) and tocols (0.7%) but poorer in alkylresorcinols (1%). After in vitro digestion, saponins from FE and QE were fully bioaccessible, sapogenins from HFE displayed a good bioaccessibility (76%) and the sapogenin from HQE was moderately bioaccesible (38%). Digestion of saponin and sapogenin standards suggested that other components of the extracts were enhancing the bioaccessibility. Other minor bioactive compounds (phytosterols, alkylresorcinols, tocols and some phenolics) also displayed optimal bioaccessibility values (70–100%).
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Rodríguez-Morató J, Jayawardene S, Huang NK, Dolnikowski GG, Galluccio J, Lichtenstein AH, Matthan NR. Simplified method for the measurement of plasma alkylresorcinols: Biomarkers of whole-grain intake. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34:e8805. [PMID: 32297383 DOI: 10.1002/rcm.8805] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 02/19/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
RATIONALE Consumption of whole grains is negatively associated with cardiovascular disease (CVD) risk but quantification of whole-grain intake is challenging. Alkylresorcinols (ARs) are biomarkers of whole-grain intake. Current methods for AR quantification involve a time-consuming multi-step separation process that hampers applicability in large-scale studies. METHODS We developed a streamlined method to quantify ARs in human plasma based on protein precipitation and direct injection into an ultra-high-performance liquid chromatograph coupled to a quadrupole time-of-flight mass spectrometer operating in atmospheric pressure chemical ionization negative ion mode. RESULTS Separation of five major ARs was achieved, with linearity in the 5 to 550 nmol/L range and a lower limit of detection (LOD) of 0.5 nmol/L and quantification (LOQ) of 5 nmol/L. The within-run and between-run precision and accuracy were below 15%, and recoveries above 90%. Once validated, the method was applied to measure concentrations of plasma ARs in subjects who participated in a randomized, crossover trial evaluating the effect of carbohydrate type on CVD risk factors. The unrefined carbohydrate diet with the highest fiber content resulted in the highest plasma AR concentration (93 ± 78 nmol/L), and was significantly different (p <0.01) from lower fiber diets (18 ± 26 nmol/L and 19 ± 26 nmol/L, simple and unrefined carbohydrate, respectively). CONCLUSIONS This method offers a simplified approach to measure concentrations of plasma ARs as an objective biomarker of whole-grain intake that can be applied to large-scale cohort studies.
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Affiliation(s)
- Jose Rodríguez-Morató
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
- Universitat Pompeu Fabra, Carrer Dr. Aiguader 80, 08003, Barcelona, Spain
| | - Sarah Jayawardene
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
| | - Neil K Huang
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
| | - Gregory G Dolnikowski
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
| | - Jean Galluccio
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
| | - Alice H Lichtenstein
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
| | - Nirupa R Matthan
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA, 02111, USA
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Pseudocereal grains: Nutritional value, health benefits and current applications for the development of gluten-free foods. Food Chem Toxicol 2020; 137:111178. [PMID: 32035214 DOI: 10.1016/j.fct.2020.111178] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 01/15/2020] [Accepted: 01/31/2020] [Indexed: 02/07/2023]
Abstract
Nowadays, consumers are more conscious of the environmental and nutritional benefits of foods. Pseudocereals grains, edible seeds belonging to dicotyledonous plant species, are becoming a current trend in human diets as gluten-free (GF) grains with excellent nutritional and nutraceutical value. Pseudocereals are a good source of starch, fiber, proteins, minerals, vitamins, and phytochemicals such as saponins, polyphenols, phytosterols, phytosteroids, and betalains with potential health benefits. The present review aims to summarize the nutritional quality and phytochemical profile of the three main pseudocereal grains: quinoa, amaranth and buckwheat. In addition, current evidence about their health benefits in animal models and human studies is also provided in detail. Based on the accumulating research supporting the inclusion of pseudocereals grains in the diet of celiac persons, this review discusses the recent advances in their application for the development of new GF products. Future directions for a wider cultivation and commercial exploitation of these crops are also highlighted.
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15
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Modest improvement in CVD risk markers in older adults following quinoa (Chenopodium quinoa Willd.) consumption: a randomized-controlled crossover study with a novel food product. Eur J Nutr 2020; 59:3313-3323. [PMID: 31919583 DOI: 10.1007/s00394-019-02169-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 12/21/2019] [Indexed: 12/20/2022]
Abstract
PURPOSE To investigate the effect of consuming quinoa biscuits on markers of CVD risk over 4 weeks in free-living older adults. METHODS A randomized-controlled, double-blind crossover trial was conducted in which consenting healthy adults aged 50-75 years (n = 40) consumed 15 g quinoa biscuits (60 g quinoa flour/100 g) or control iso-energetic biscuits (made using wheat flour) daily for 28 consecutive days (4 weeks), in addition to their normal diet. Following a 6-week washout, participants consumed the alternate biscuit for a final 4 weeks. Anthropometry and fasted blood samples were obtained before and after each intervention period. RESULTS At the beginning of the trial, mean ± SD total cholesterol concentrations were 6.02 ± 1.22 mmol/L (3.7-9.2 mmol/L); 33 participants (82.5%) had high cholesterol (> 5 mmol/L). No participants were lost to follow-up and there were no changes in habitual dietary intakes or levels of physical activity between each 4-week intervention period. Significantly greater decreases in total and LDL cholesterol concentrations (- 0.30 ± 0.58 and - 0.25 ± 0.38 mmol/L, respectively), TC: HDL ratio (- 0.11 ± 0.30), weight (- 0.61 ± 0.89 kg) and BMI (- 0.22 ± 0.34 kg/m2) were apparent following consumption of the quinoa versus control biscuits (all P < 0.05). Changes in triglycerides, HDL cholesterol, or PUFA or CRP concentrations were not significant between treatment groups. CONCLUSION Consumption of novel quinoa biscuits produced small, but favorable changes in body weight, BMI, and circulating cholesterol concentrations, all of which may contribute to lowered CVD risk in older adults.
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16
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Landberg R, Hanhineva K, Tuohy K, Garcia-Aloy M, Biskup I, Llorach R, Yin X, Brennan L, Kolehmainen M. Biomarkers of cereal food intake. GENES AND NUTRITION 2019; 14:28. [PMID: 31632507 PMCID: PMC6790055 DOI: 10.1186/s12263-019-0651-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 08/14/2019] [Indexed: 02/06/2023]
Abstract
Background/objectives Cereal foods are major contributors to the daily energy, protein, and dietary fiber intake all over the world. The role of cereals in human health is dependent on whether they are consumed as refined or whole grain and on cereal species. To unravel the underlying mechanisms of health effects attributed to specific cereal foods and to provide more precise dietary advice, there is a need for improved dietary assessment of whole-grain intake. Dietary biomarkers of specific cereals, different fractions or cereal-containing foods could offer such a possibility. The aim of this review was to summarize the current status on biomarkers of different cereals, fractions, and specific cereal foods. Subjects and methods A literature review was conducted and putative biomarkers of different cereals and pseudo-cereals (wheat, oats, rye, barley, rice, and quinoa) as well as for different grain fractions (whole grain, refined grain, bran) and foods were summarized and discussed. Results Several putative biomarkers have been suggested for different cereals, due to their unique presence in these grains. Among the biomarkers, odd-numbered alkylresorcinols are the most well-studied and -evaluated biomarkers and reflect whole-grain wheat and rye intake. Even-numbered alkylresorcinols have been suggested to reflect quinoa intake. Recent studies have also highlighted the potential of avenanthramides and avenacosides as specific biomarkers of oat intake, and a set of biomarkers have been suggested to reflect rice bran intake. However, there are yet no specific biomarkers of refined grains. Most biomarker candidates remain to be evaluated in controlled interventions and free-living populations before applied as biomarkers of intake in food and health studies. Conclusion Several putative biomarkers of different cereals have been suggested and should be validated in human studies using recently developed food intake biomarker validation criteria.
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Affiliation(s)
- Rikard Landberg
- 1Department of Biology and Biological Engineering, Division of Food and Nutrition Science, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Kati Hanhineva
- 2Institute of Public Health and Clinical Nutrition, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Kieran Tuohy
- 3Nutrition and Nutrigenomics Unit, Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, 38010 Trento, Italy
| | - Mar Garcia-Aloy
- 4Biomarkers and Nutrimetabolomic Laboratory, Department of Nutrition, Food Sciences and Gastronomy, Food Technology Reference Net (XaRTA), Nutrition and Food Safety Research Institute (INSA-UB), Faculty of Pharmacy and Food Sciences, Campus Torribera, University of Barcelona, Barcelona, Spain.,5CIBER de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Barcelona, Spain
| | - Izabela Biskup
- 1Department of Biology and Biological Engineering, Division of Food and Nutrition Science, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Rafael Llorach
- 4Biomarkers and Nutrimetabolomic Laboratory, Department of Nutrition, Food Sciences and Gastronomy, Food Technology Reference Net (XaRTA), Nutrition and Food Safety Research Institute (INSA-UB), Faculty of Pharmacy and Food Sciences, Campus Torribera, University of Barcelona, Barcelona, Spain.,5CIBER de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Barcelona, Spain
| | - Xiaofei Yin
- UCD School of Agriculture and Food Science, Institute of Food and Health, Belfield, Dublin 4, Ireland
| | - Lorraine Brennan
- UCD School of Agriculture and Food Science, Institute of Food and Health, Belfield, Dublin 4, Ireland
| | - Marjukka Kolehmainen
- 2Institute of Public Health and Clinical Nutrition, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
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Rocchetti G, Lucini L, Giuberti G, Bhumireddy SR, Mandal R, Trevisan M, Wishart DS. Transformation of polyphenols found in pigmented gluten-free flours during in vitro large intestinal fermentation. Food Chem 2019; 298:125068. [PMID: 31260977 DOI: 10.1016/j.foodchem.2019.125068] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 06/14/2019] [Accepted: 06/23/2019] [Indexed: 12/18/2022]
Abstract
In this work, 18 gluten-free flours (prepared from cereals, pseudocereals and legumes), differing in pigmentation, were screened for their phenolic profiles, cooked and, then, subjected to digestion and large intestinal fermentation in vitro. A combined targeted/untargeted metabolomic approach was used to elucidate the microbial biotransformation processes of polyphenols following digestion. This preliminary work demonstrated an increase in 3,5-dihydroxybenzoic acid (on average from 0.67 up to 1.30 μmol/g dry matter) throughout large intestinal fermentation of pseudocereals (esp. quinoa), due to their high alkylresorcinol contents. Isoflavones were converted into equol- or O-desmethylangolensin- derivatives, whereas anthocyanins were degraded into lower-molecular-weight phenolics (i.e., protocatechuic aldehyde and 4-hydroxybenzoic acid, with the latter exhibiting the highest increase over time). A decreasing trend was observed for antioxidant activities (i.e., FRAP and ORAC values) moving from digested to faecal fermented samples. These findings highlight that gluten-free flours are able to deliver bioaccessible polyphenols to the colon.
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Affiliation(s)
- Gabriele Rocchetti
- Department of Animal Science, Food and Nutrition, Università Cattolica del Sacro Cuore, Piacenza 29122, Italy; Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza 29122, Italy; Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
| | - Luigi Lucini
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza 29122, Italy.
| | - Gianluca Giuberti
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza 29122, Italy
| | | | - Rupasri Mandal
- Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada
| | - Marco Trevisan
- Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Piacenza 29122, Italy
| | - David S Wishart
- Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada; Department of Computing Science, University of Alberta, Edmonton, AB T6G 2E8, Canada
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Lipid profiling and analytical discrimination of seven cereals using high temperature gas chromatography coupled to high resolution quadrupole time-of-flight mass spectrometry. Food Chem 2019; 282:27-35. [DOI: 10.1016/j.foodchem.2018.12.109] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 12/20/2018] [Accepted: 12/22/2018] [Indexed: 01/21/2023]
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Non-Destructive Determination of Alkylresorcinol (ARs) Content on Wheat Seed Surfaces and Prediction of ARs Content in Whole-Grain Flour. Molecules 2019; 24:molecules24071329. [PMID: 30987319 PMCID: PMC6479818 DOI: 10.3390/molecules24071329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 03/31/2019] [Accepted: 04/02/2019] [Indexed: 12/12/2022] Open
Abstract
Alkylresorcinols (ARs) are beneficial for human health and can be used as biomarkers for whole-grain cereal intake. In previous studies, ARs content in whole-grain flour was determined by milling the seeds into powder, thus destroying their structure. In this paper, we adopted a non-destructive extraction approach. Chloroform and ethyl acetate extraction methods were carried out to extract lipids from the seed surface and whole-grain flour of 36 wheat varieties in China, respectively. GC-MS analysis identified chemical compounds in which ARs were the major compounds for all the samples. The average total content of ARs (624.223 µg/g) in whole grains was much higher than that on seed surfaces (4.934 µg/g), with a positive correlation (r = 0.863, p < 0.001) between these two parameters. The results suggested that the total ARs content on the seed surface can be used to predict their content in whole-grain flour. Without affecting the seed germination rate and damaging seed structure, we demonstrate that a non-destructive extraction approach is an appropriate and useful method, facilitating the development of rapid screening methods suitable for use in wheat breeding.
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20
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Gunenc A, Rowland O, Xu H, Marangoni A, Hosseinian F. Portulaca oleracea seeds as a novel source of alkylresorcinols and its phenolic profiles during germination. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2018.10.075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Dihm K, Vendelbo Lind M, Sundén H, Ross A, Savolainen O. Quantification of benzoxazinoids and their metabolites in Nordic breads. Food Chem 2017; 235:7-13. [DOI: 10.1016/j.foodchem.2017.05.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 04/18/2017] [Accepted: 05/01/2017] [Indexed: 10/19/2022]
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von Wettstein-Knowles P. The Polyketide Components of Waxes and the Cer-cqu Gene Cluster Encoding a Novel Polyketide Synthase, the β-Diketone Synthase, DKS. PLANTS 2017; 6:plants6030028. [PMID: 28698520 PMCID: PMC5620584 DOI: 10.3390/plants6030028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 06/21/2017] [Accepted: 06/30/2017] [Indexed: 01/13/2023]
Abstract
The primary function of the outermost, lipophilic layer of plant aerial surfaces, called the cuticle, is preventing non-stomatal water loss. Its exterior surface is often decorated with wax crystals, imparting a blue–grey color. Identification of the barley Cer-c, -q and -u genes forming the 101 kb Cer-cqu gene cluster encoding a novel polyketide synthase—the β-diketone synthase (DKS), a lipase/carboxyl transferase, and a P450 hydroxylase, respectively, establishes a new, major pathway for the synthesis of plant waxes. The major product is a β-diketone (14,16-hentriacontane) aliphatic that forms long, thin crystalline tubes. A pathway branch leads to the formation of esterified alkan-2-ols.
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Affiliation(s)
- Penny von Wettstein-Knowles
- Section for Biomolecular Sciences, Department of Biology, University of Copenhagen, Ole Maaloees Vej 5, DK-2200 Copenhagen N, Denmark.
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24
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Separation of alk(en)ylresorcinols from rye bran with saturated, monoenoic, dienoic, trienoic and hydroxylated monoenoic side chains using an octyl phase in ultra-high performance liquid chromatography and their differentiation by tandem mass spectrometrie. J Chromatogr A 2017; 1506:65-72. [DOI: 10.1016/j.chroma.2017.05.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 05/07/2017] [Accepted: 05/09/2017] [Indexed: 12/15/2022]
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Choung RS, Murray JA, Marietta EV, Van Dyke CT, Ross AB. Serum alkylresorcinols as biomarkers of dietary gluten exposure in coeliac disease. Aliment Pharmacol Ther 2017; 45:643-652. [PMID: 28052442 DOI: 10.1111/apt.13917] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 09/25/2016] [Accepted: 12/05/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND Therapy for coeliac disease (CD) mainly relies on following a gluten-free diet (GFD); however, a serum marker for gluten intake has yet to be established. AIM To evaluate the utility of alkylresorcinol concentrations for detecting gluten intake in studies of human and mouse. METHODS Alkylresorcinol concentrations were compared among treated patients with coeliac disease (n = 34), untreated coeliac disease patients (n = 36) and controls (n = 33). Furthermore, seven additional coeliac disease patients whose serum samples were available at diagnosis and after GFD were evaluated. In mice studies, alkylresorcinol concentrations were compared in the serum of five mice fed a regular chow and 10 mice fed lifelong with a gluten-free chow. In addition, the effect of adding gluten on changes of alkylresorcinol concentrations was also evaluated. RESULTS Total alkylresorcinol concentrations were significantly lower in treated with coeliac disease [median (IQR), 3 (2-8) nmol/L], compared to untreated patients [median (IQR), 32 (11-74) nmol/L; P < 0.0001] or healthy controls [median (IQR), 54 (23-112) nmol/L; P < 0.0001]. Moreover, alkylresorcinol concentrations in coeliac disease patients significantly decreased after introduction of a GFD (median, 34 nmol/L at diagnosis vs. 5 nmol/L after GFD, P = 0.02). In the mice, median (IQR) total alkylresorcinol concentrations in serum samples of mice fed lifelong with a gluten-free chow was 1.8 (1.6-2.3) nmol/L, which was further significantly increased to 16 (11-22) nmol/L after 8 days of feeding with the gluten-free chow that had gluten added to it. (P = 0.008). CONCLUSION Serum alkylresorcinol concentrations could be a useful marker for dietary gluten in coeliac disease.
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Affiliation(s)
- R S Choung
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - J A Murray
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - E V Marietta
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - C T Van Dyke
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - A B Ross
- Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
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