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Púčiková V, Rohn S, Hanschen FS. Glucosinolate Accumulation and Hydrolysis in Leafy Brassica Vegetables Are Influenced by Leaf Age. J Agric Food Chem 2023; 71:11466-11475. [PMID: 37462686 DOI: 10.1021/acs.jafc.3c01997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
The health-beneficial effects of Brassica vegetables are mainly attributed to their high contents of glucosinolates and the products of their hydrolysis, especially isothiocyanates. Distribution of glucosinolates across plant organs can strongly vary. Here, we investigated the effect of leaf age on glucosinolate accumulation and hydrolysis in two leafy Brassica vegetables, pak choi and giant red mustard. We also evaluated the activity of the hydrolyzing enzyme myrosinase across the leaves. Finally, we assessed whether glucosinolates are transported from older leaves to younger leaves. Young leaves of both species contained more than 3-fold more glucosinolates than older ones. Accordingly, more isothiocyanates were released in the young leaves. Myrosinases fully hydrolyzed all of the amounts of glucosinolates regardless of the leaf age. Moreover, older leaves were observed to supply younger leaves with glucosinolates. Thus, this study suggests that consumers can improve the nutritional value of food by incorporating young leaves of leafy Brassicas in their diet.
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Affiliation(s)
- Vanda Púčiková
- Plant Quality and Food Security, Leibniz Institute of Vegetable and Ornamental Crops (IGZ) e.V., Theodor-Echtermeyer-Weg 1, 14979 Grossbeeren, Germany
- Hamburg School of Food Science, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany
| | - Sascha Rohn
- Institute of Food Technology and Food Chemistry, Technische Universität Berlin, Gustav-Meyer-Allee 25, 13355 Berlin, Germany
| | - Franziska S Hanschen
- Plant Quality and Food Security, Leibniz Institute of Vegetable and Ornamental Crops (IGZ) e.V., Theodor-Echtermeyer-Weg 1, 14979 Grossbeeren, Germany
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Tříska J, Balík J, Houška M, Novotná P, Magner M, Vrchotová N, Híc P, Jílek L, Thorová K, Šnurkovič P, Soural I. Factors Influencing Sulforaphane Content in Broccoli Sprouts and Subsequent Sulforaphane Extraction. Foods 2021; 10:1927. [PMID: 34441704 DOI: 10.3390/foods10081927] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 08/16/2021] [Indexed: 11/25/2022] Open
Abstract
Broccoli sprouts contain 10–100 times higher levels of sulforaphane than mature plants, something that has been well known since 1997. Sulforaphane has a whole range of unique biological properties, and it is especially an inducer of phase 2 detoxication enzymes. Therefore, its use has been intensively studied in the field of health and nutrition. The formation of sulforaphane is controlled by the epithiospecifier protein, a myrosinase co-factor, which is temperature-specific. This paper studies the influence of temperature, heating time, the addition of myrosinase in the form of Raphanus sativus sprouts in constant ratio to broccoli sprouts, and other technological steps on the final sulforaphane content in broccoli sprout homogenates. These technological steps are very important for preserving sulforaphane in broccoli sprouts, but there are some limitations concerning the amount of sulforaphane. We focused, therefore, on the extraction process, using suitable β-cyclodextrin, hexane and ethanol, with the goal of increasing the amount of sulforaphane in the final extract, thus stabilizing it and reducing the required amount sulforaphane needed, e.g., as a dietary supplement.
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Román J, González D, Inostroza-Ponta M, Mahn A. Molecular Modeling of Epithiospecifier and Nitrile-Specifier Proteins of Broccoli and Their Interaction with Aglycones. Molecules 2020; 25:molecules25040772. [PMID: 32054008 PMCID: PMC7071048 DOI: 10.3390/molecules25040772] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 01/31/2020] [Accepted: 02/03/2020] [Indexed: 12/24/2022] Open
Abstract
Glucosinolates are secondary plant metabolites of Brassicaceae. They exert their effect after enzymatic hydrolysis to yield aglycones, which become nitriles and epithionitriles through the action of epithiospecifier (ESP) and nitrile-specifier proteins (NSP). The mechanism of action of broccoli ESP and NSP is poorly understood mainly because ESP and NSP structures have not been completely characterized and because aglycones are unstable, thus hindering experimental measurements. The aim of this work was to investigate the interaction of broccoli ESP and NSP with the aglycones derived from broccoli glucosinolates using molecular simulations. The three-dimensional structure of broccoli ESP was built based on its amino-acid sequence, and the NSP structure was constructed based on a consensus amino-acid sequence. The models obtained using Iterative Threading ASSEmbly Refinement (I-TASSER) were refined with the OPLS-AA/L all atom force field of GROMACS 5.0.7 and were validated by Veryfy3D and ERRAT. The structures were selected based on molecular dynamics simulations. Interactions between the proteins and aglycones were simulated with Autodock Vina at different pH. It was concluded that pH determines the stability of the complexes and that the aglycone derived from glucoraphanin has the highest affinity to both ESP and NSP. This agrees with the fact that glucoraphanin is the most abundant glucosinolate in broccoli florets.
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Affiliation(s)
- Juan Román
- Departamento de Ingeniería Química, Universidad de Santiago de Chile, Avenida Libertador Bernardo O’Higgins 3363, Estación Central, Santiago 9170019, Chile; (J.R.); (D.G.)
| | - Dorian González
- Departamento de Ingeniería Química, Universidad de Santiago de Chile, Avenida Libertador Bernardo O’Higgins 3363, Estación Central, Santiago 9170019, Chile; (J.R.); (D.G.)
| | - Mario Inostroza-Ponta
- Departamento de Ingeniería Informática, Universidad de Santiago de Chile, Avenida Libertador Bernardo O’Higgins 3363, Estación Central, Santiago 9170019, Chile;
| | - Andrea Mahn
- Departamento de Ingeniería Química, Universidad de Santiago de Chile, Avenida Libertador Bernardo O’Higgins 3363, Estación Central, Santiago 9170019, Chile; (J.R.); (D.G.)
- Correspondence: ; Tel.: +56-2-2718-1833
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Westphal A, Riedl KM, Cooperstone JL, Kamat S, Balasubramaniam VM, Schwartz SJ, Böhm V. High-Pressure Processing of Broccoli Sprouts: Influence on Bioactivation of Glucosinolates to Isothiocyanates. J Agric Food Chem 2017; 65:8578-8585. [PMID: 28929757 PMCID: PMC7104659 DOI: 10.1021/acs.jafc.7b01380] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Effects of high-pressure processing (HPP, 100-600 MPa for 3 min at 30 °C) on the glucosinolate content, conversion to isothiocyanates, and color changes during storage in fresh broccoli sprouts were investigated. A mild heat treatment (60 °C) and boiling (100 °C) were used as positive and negative controls, respectively. Glucosinolates were quantified using liquid chromatography-mass spectrometry, and isothiocyanates were quantified using high-performance liquid chromatography-photodiode array detection. A formation of isothiocyanates was observed in all high-pressure-treated sprouts. The highest degree of conversion (85%) was observed after the 600 MPa treatment. Increased isothiocyanate formation at 400-600 MPa suggests an inactivation of the epithiospecifier protein. During storage, color changed from green to brownish, reflected by increasing a* values and decreasing L* values. This effect was less pronounced for sprouts treated at 100 and 600 MPa, indicating an influence on the responsible enzymes. In summary, HPP had no negative effects on the glucosinolate-myrosinase system in broccoli sprouts.
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Affiliation(s)
- Anna Westphal
- Institute of Nutrition, Friedrich Schiller University Jena, Dornburger Straße 25-29, 07743 Jena, Germany
| | - Kenneth M. Riedl
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, 110 Parker Food Science and Technology Building, Columbus, Ohio 43210, United States
| | - Jessica L. Cooperstone
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, 110 Parker Food Science and Technology Building, Columbus, Ohio 43210, United States
| | - Shreya Kamat
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, 110 Parker Food Science and Technology Building, Columbus, Ohio 43210, United States
| | - V. M. Balasubramaniam
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, 110 Parker Food Science and Technology Building, Columbus, Ohio 43210, United States
| | - Steven J. Schwartz
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Road, 110 Parker Food Science and Technology Building, Columbus, Ohio 43210, United States
| | - Volker Böhm
- Institute of Nutrition, Friedrich Schiller University Jena, Dornburger Straße 25-29, 07743 Jena, Germany
- Corresponding Author: Telephone: +49-3641-949633. Fax: +49-3641-949702.
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Ku KM, Jeffery EH, Juvik JA, Kushad MM. Correlation of quinone reductase activity and allyl isothiocyanate formation among different genotypes and grades of horseradish roots. J Agric Food Chem 2015; 63:2947-2955. [PMID: 25684599 DOI: 10.1021/jf505591z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Horseradish (Armoracia rusticana) is a perennial crop and its ground root tissue is used in condiments because of the pungency of the glucosinolate (GS)-hydrolysis products allyl isothiocyanate (AITC) and phenethyl isothiocyanate (PEITC) derived from sinigrin and gluconasturtiin, respectively. Horseradish roots are sold in three grades: U.S. Fancy, U.S. No. 1, and U.S. No. 2 according to the USDA standards. These grading standards are primarily based on root diameter and length. There is little information on whether root grades vary in their phytochemical content or potential health promoting properties. This study measured GS, GS-hydrolysis products, potential anticancer activity (as quinone reductase inducing activity), total phenolic content, and antioxidant activities from different grades of horseradish accessions. U.S. Fancy showed significantly higher sinigrin and AITC concentrations than U.S. No. 1 ,whereas U.S. No. 1 showed significantly higher concentrations of 1-cyano 2,3-epithiopropane, the epithionitrile hydrolysis product of sinigrin, and significantly higher total phenolic concentrations than U.S. Fancy.
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Affiliation(s)
- Kang-Mo Ku
- †Department of Crop Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3838, United States
| | - Elizabeth H Jeffery
- †Department of Crop Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3838, United States
| | - John A Juvik
- †Department of Crop Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3838, United States
| | - Mosbah M Kushad
- †Department of Crop Sciences and ‡Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3838, United States
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Borgen BH, Thangstad OP, Ahuja I, Rossiter JT, Bones AM. Removing the mustard oil bomb from seeds: transgenic ablation of myrosin cells in oilseed rape (Brassica napus) produces MINELESS seeds. J Exp Bot 2010; 61:1683-97. [PMID: 20219777 PMCID: PMC2852662 DOI: 10.1093/jxb/erq039] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Revised: 01/29/2010] [Accepted: 02/01/2010] [Indexed: 05/23/2023]
Abstract
Many plant phytochemicals constitute binary enzyme-glucoside systems and function in plant defence. In brassicas, the enzyme myrosinase is confined to specific myrosin cells that separate the enzyme from its substrate; the glucosinolates. The myrosinase-catalysed release of toxic and bioactive compounds such as isothiocyanates, upon activation or tissue damage, has been termed 'the mustard oil bomb' and characterized as a 'toxic mine' in plant defence. The removal of myrosin cells and the enzyme that triggers the release of phytochemicals have been investigated by genetically modifying Brassica napus plants to remove myrosinase-storing idioblasts. A construct with the seed myrosin cell-specific Myr1.Bn1 promoter was used to express a ribonuclease, barnase. Transgenic plants ectopically expressing barnase were embryo lethal. Co-expressing barnase under the control of the Myr1.Bn1 promoter with the barnase inhibitor, barstar, under the control of the cauliflower mosaic virus 35S promoter enabled a selective and controlled death of myrosin cells without affecting plant viability. Ablation of myrosin cells was confirmed with light and electron microscopy, with immunohistological analysis and immunogold-electron microscopy analysis showing empty holes where myrosin cells normally are localized. Further evidence for a successful myrosin cell ablation comes from immunoblots showing absence of myrosinase and negligible myrosinase activity, and autolysis experiments showing negligible production of glucosinolate hydrolysis products. The plants where the myrosin defence cells have been ablated and named 'MINELESS plants'. The epithiospecifier protein profile and glucosinolate levels were changed in MINELESS plants, pointing to localization of myrosinases and a 35 kDa epithiospecifier protein in myrosin cells and a reduced turnover of glucosinolates in MINELESS plants.
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Affiliation(s)
- Birgit Hafeld Borgen
- Department of Biology, Norwegian University of Science and Technology, Realfagbygget, N-7491 Trondheim, Norway
| | - Ole Petter Thangstad
- Department of Biology, Norwegian University of Science and Technology, Realfagbygget, N-7491 Trondheim, Norway
| | - Ishita Ahuja
- Department of Biology, Norwegian University of Science and Technology, Realfagbygget, N-7491 Trondheim, Norway
| | - John Trevor Rossiter
- Division of Biology, Imperial College London, Sir Alexander Fleming Building, South Kensington, London SW7 2AZ, UK
| | - Atle Magnar Bones
- Department of Biology, Norwegian University of Science and Technology, Realfagbygget, N-7491 Trondheim, Norway
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