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Çelik EE, Cömert ED, Gökmen V. The power of the QUENCHER method in measuring total antioxidant capacity of foods: Importance of interactions between different forms of antioxidants. Talanta 2024; 269:125474. [PMID: 38039674 DOI: 10.1016/j.talanta.2023.125474] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/20/2023] [Accepted: 11/22/2023] [Indexed: 12/03/2023]
Abstract
Antioxidants play a crucial role in maintaining human health by counteracting oxidative stress and regulating redox balance within the body. The mixture of various antioxidant compounds in different forms (i.e., free, bound, insoluble) in food creates a redox active environment both in the human body and in the food system. Acting as both electron donors and acceptors while interacting with each other can either result in antagonism through pro-oxidative effects, or synergism through regeneration of one antioxidant by another. During the antioxidant capacity measurement, besides the individual antioxidant effects of the antioxidant components, these effects that occur because of their interaction with each other should be also considered. Classical antioxidant capacity measurement methods mostly concentrate on the fractions of foods that can be extracted with either water, alcohol, lipid, or acid/alkaline solutions. Antioxidants that cannot be extracted with any solvent are mostly ignored in these methods. On the other hand, the QUENCHER method, which allows direct measurement of antioxidant capacity foods without extraction, offers a rational solution to the limitations of traditional extraction-based methods. This approach considers the antioxidant capacity and interactions of all antioxidant forms that can be found in a food matrix, at the same time. This review provides detailed insights into the advantages of QUENCHER as a holistic approach for the accurate measurement of the antioxidant capacity of foods.
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Affiliation(s)
- Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara, 06800, Turkey
| | - Ezgi Doğan Cömert
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara, 06800, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara, 06800, Turkey.
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Çelik EE, Canli M, Kocadağlı T, Özkaynak Kanmaz E, Gökmen V. Formation of Histamine, phenylethylamine and γ-Aminobutyric acid during sprouting and fermenting of selected wholegrains. Food Res Int 2023; 173:113447. [PMID: 37803773 DOI: 10.1016/j.foodres.2023.113447] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 09/04/2023] [Accepted: 09/10/2023] [Indexed: 10/08/2023]
Abstract
Sprouting and fermentation are known to cause hydrolysis of proteins into amino acids in grains, which in turn can be converted into some neuroactive compounds by some specific enzymes.One of these compounds is γ-aminobutyric acid, which is directly related to stress management. This study invesitgatesthe effects of sprouting and fermentation processes performed under different conditions on the formation of γ-aminobutyric acid.. Concomitant phenylethylamine and histamine formations were also investigated from the food safety point of view. The combined application of sprouting and fermentation increased the concentrations of histamine and phenylethylamine to a maximum of 44 ± 5 and 3.9 ± 0.002 mg/kg, respectively. Nevertheless, these values did not reach the level that would cause undesirable effects. γ-Aminobutyric acid concentrations were found to reach levels comparable to γ-Aminobutyric acid -rich foods (maximum 674 ± 31 mg/kg) both with separate and combined application of sprouting and fermentation.
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Affiliation(s)
- Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Merve Canli
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Evrim Özkaynak Kanmaz
- Department of Nutrition and Dietetics, Artvin Çoruh University, 08100 Seyitler, Artvin, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey.
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Yıltırak S, Kocadağlı T, Evrim Çelik E, Özkaynak Kanmaz E, Gökmen V. Effects of sprouting and fermentation on the formation of Maillard reaction products in different cereals heated as wholemeal. Food Chem 2022; 389:133075. [PMID: 35489263 DOI: 10.1016/j.foodchem.2022.133075] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 04/16/2022] [Accepted: 04/22/2022] [Indexed: 11/04/2022]
Abstract
The concentration and composition of reducing sugars and free amino acids as Maillard reaction (MR) precursors change with grain sprouting. The formation of early and advanced glycation products, and α-dicarbonyl compounds as intermediates were monitored during heating native and sprouted wholemeals, as well as during heating of yeast and sourdough fermented native and sprouted wholemeals. Sprouting increased the concentration of all MR products because of an increase in reducing sugar concentrations. Although reducing sugars were lowered due to their consumption by yeasts, fermentation did not lower the furosine concentration. Sourdough fermentation unexpectedly increased furosine because the low pH caused glucose release from polysaccharides. Glyoxal, methylglyoxal and diacetyl were found to be formed as metabolites during yeast and sourdough fermentation. Another factor affecting the MR in sprouted/fermented wholemeals was revealed to be the increased amount of total free amino acids that compete with bound lysine to react with reducing sugars.
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Affiliation(s)
- Süleyman Yıltırak
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Evrim Özkaynak Kanmaz
- Department of Nutrition and Dietetics, Artvin Çoruh University, 08100 Seyitler, Artvin, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey.
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Canlı M, Çelik EE, Kocadağlı T, Kanmaz EÖ, Gökmen V. Formation of Bioactive Tyrosine Derivatives during Sprouting and Fermenting of Selected Whole Grains. J Agric Food Chem 2021; 69:12517-12526. [PMID: 34652133 DOI: 10.1021/acs.jafc.1c05064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 06/13/2023]
Abstract
Sprouting is a popular method in cereal processing because sprouted grains are accepted to have high nutritional value. The increased proteolytic activity by sprouting increases the free amino acids in grains. It was hypothesized that an increased amount of tyrosine can be utilized by microorganisms during fermentation to form higher amounts of bioactive tyrosine derivatives. Sprouting increased the tyrosine and tyramine contents considerably, but increases and decreases in l-3,4-dihydroxyphenylalanine (l-DOPA) and dopamine were specific to the cereal. More tyramine, l-DOPA, and dopamine formation was observed during sourdough fermentation than that in yeast fermentation. As a result of the combined application of sprouting (48 h at 20 °C) and sourdough fermentation (36 h at 30 °C), the amounts of dopamine, l-DOPA, and tyramine found in rye were 27, 50, and 136 mg/kg, respectively. Cereal products rich in dopamine and l-DOPA can thus be produced as functional food ingredients with their positive effects on human health and mood.
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Affiliation(s)
- Merve Canlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Evrim Özkaynak Kanmaz
- Department of Nutrition and Dietetics, Artvin Çoruh University, 08100 Seyitler, Artvin, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, 06800 Beytepe, Ankara, Turkey
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Yıltırak S, Kocadağlı T, Çelik EE, Özkaynak Kanmaz E, Gökmen V. Effects of Sprouting and Fermentation on Free Asparagine and Reducing Sugars in Wheat, Einkorn, Oat, Rye, Barley, and Buckwheat and on Acrylamide and 5-Hydroxymethylfurfural Formation during Heating. J Agric Food Chem 2021; 69:9419-9433. [PMID: 34374283 DOI: 10.1021/acs.jafc.1c03316] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 06/13/2023]
Abstract
Usage of sprouted grains is an increasing trend in thermally processed foods. Sprouting alters the composition of sugars and amino acids, which are Maillard reaction precursors. Free asparagine, total free amino acids, and sugars were monitored during sprouting and yeast and sourdough fermentations. Acrylamide and 5-hydroxymethylfurfural (HMF) were analyzed in heated samples. The asparagine concentration decreased up to 40% after 24-36 h of sprouting, except for buckwheat, and then increased to the initial concentration after 48 h and several folds after 72 h. The increased amount of reducing sugars after sprouting caused higher acrylamide and HMF formation even if the asparagine concentration was lower. Acrylamide and HMF formation decreased after fermentation of sprouted wholemeal because sugars and asparagine were consumed by yeast. A pH drop of 3 units by sourdough fermentation decreased acrylamide formation but increased HMF formation. Results indicated that sprouted cereal products should be produced under controlled conditions to be used in heated foods.
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Affiliation(s)
- Süleyman Yıltırak
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Tolgahan Kocadağlı
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
| | - Evrim Özkaynak Kanmaz
- Department of Nutrition and Dietetics, Artvin Çoruh University, Seyitler, Artvin 08100, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Department of Food Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
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Abstract
This review aimed to give comprehensive information about the interactions between free and bound antioxidants naturally found in different food matrices. In this context, firstly, the free and bound antioxidant terms are defined; their place in the daily diet, the path they follow in the body and their characteristics are explained. Factors affecting the interactions have been revealed as a result of the compilation of studies conducted until today, related to bound and free antioxidant interactions. Accordingly, it was observed that many factors such as reaction environment, concentration, pH, chemical structure, source and antioxidant/prooxidant nature of the compounds were effective on interactions. It has been emphasized that the interactions between free and bound antioxidants have a dynamic balance that can easily change under the influence of various factors, which in turn needs the interactions to be handled specifically for each case.
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Affiliation(s)
- Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Food Engineering Department, Hacettepe University, Ankara, Turkey
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Food Engineering Department, Hacettepe University, Ankara, Turkey
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Çelik EE, Gökmen V. Effects of fermentation and heat treatments on bound-ferulic acid content and total antioxidant capacity of bread crust-like systems made of different whole grain flours. J Cereal Sci 2020. [DOI: 10.1016/j.jcs.2020.102978] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Çelik EE, Gökmen V. Formation of Maillard reaction products in bread crust-like model system made of different whole cereal flours. Eur Food Res Technol 2020. [DOI: 10.1007/s00217-020-03481-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Çelik EE, Rubio JMA, Andersen ML, Gökmen V. Interactions of dietary fiber bound antioxidants with hydroxycinnamic and hydroxybenzoic acids in aqueous and liposome media. Food Chem 2019; 278:294-304. [DOI: 10.1016/j.foodchem.2018.11.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 11/09/2018] [Accepted: 11/12/2018] [Indexed: 11/16/2022]
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Çelik EE, Gökmen V. A study on interactions between the insoluble fractions of different coffee infusions and major cocoa free antioxidants and different coffee infusions and dark chocolate. Food Chem 2018; 255:8-14. [DOI: 10.1016/j.foodchem.2018.02.048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 01/14/2018] [Accepted: 02/09/2018] [Indexed: 11/30/2022]
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Çelik EE, Rubio JMA, Gökmen V. Behaviour of Trolox with macromolecule-bound antioxidants in aqueous medium: Inhibition of auto-regeneration mechanism. Food Chem 2018; 243:428-434. [PMID: 29146360 DOI: 10.1016/j.foodchem.2017.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 09/02/2017] [Accepted: 10/03/2017] [Indexed: 11/26/2022]
Abstract
This work aimed at investigating the behaviour of Trolox, vitamin E analogue, in presence of macromolecule-bound antioxidants in aqueous radical medium. Three main groups of macromolecule-bound antioxidants were assayed: dietary fiber (DF), protein and lipid-bound antioxidants, represented by whole wheat, soybean and olive oil products, respectively. Experimental studies were carried out in aqueous ABTS (2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)) radical medium. Trolox and macromolecule-bound antioxidants were added to radical separately and together in different concentrations. Antioxidant capacities were determined using QUENCHER procedure. pH of radical media was altered for DF and protein-bound antioxidant studies to examine its effect. Chemometric tools were used for experimental design and multivariate data analysis. Results revealed antagonistic interactions for Trolox with all macromolecule-bound antioxidants. The reason behind this antagonism was investigated through oxidation reactions of Trolox via mass spectrometry analysis. Consequently, a proof was obtained for inhibitory effect of bound-antioxidants on auto-regeneration reactions of Trolox.
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Affiliation(s)
- Ecem Evrim Çelik
- Food Quality and Safety (FoQuS) Research Group, Food Engineering Department, Hacettepe University, 06800 Beytepe, Ankara, Turkey; Chemometrics and Analytical Technology, Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark.
| | - Jose Manuel Amigo Rubio
- Chemometrics and Analytical Technology, Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark; Department of Fundamental Chemistry, Federal University of Pernambuco, Av. Prof. Moraes Rego, 1235 - Cidade Universitária, Recife, Brazil.
| | - Vural Gökmen
- Food Quality and Safety (FoQuS) Research Group, Food Engineering Department, Hacettepe University, 06800 Beytepe, Ankara, Turkey.
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Çelik EE, Rubio JMA, Andersen ML, Gökmen V. Interactions between macromolecule-bound antioxidants and Trolox during liposome autoxidation: A multivariate approach. Food Chem 2017; 237:989-996. [DOI: 10.1016/j.foodchem.2017.06.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 06/01/2017] [Accepted: 06/05/2017] [Indexed: 11/28/2022]
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Abstract
This study investigates the synergism between antioxidants bound to dietary fibers (DF) of grains and soluble antioxidants of highly consumed beverages or their pure antioxidants. The interaction between insoluble fractions of grains containing bound antioxidants and soluble antioxidants was investigated using (i) a liposome-based system by measuring the lag phase before the onset of oxidation and (ii) an ESR-based system by measuring the reduction percentage of Fremy's salt radical. In both procedures, antioxidant capacities of DF-bound and soluble antioxidants were measured as well as their combinations, which were prepared at different ratios. The simple addition effects of DF-bound and soluble antioxidants were compared with measured values. The results revealed a clear synergism for almost all combinations in both liposome- and ESR-based systems. The synergism observed in DF-bound-soluble antioxidant system paints a promising picture considering the role of fiber in human gastrointestinal (GI) tract health.
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Affiliation(s)
- Ecem Evrim Çelik
- Department of Food Engineering, Hacettepe University , 06800 Beytepe, Ankara, Turkey
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Çelik EE, Gökmen V. Investigation of the interaction between soluble antioxidants in green tea and insoluble dietary fiber bound antioxidants. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.02.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Çelik EE, Gökmen V, Fogliano V. Soluble antioxidant compounds regenerate the antioxidants bound to insoluble parts of foods. J Agric Food Chem 2013; 61:10329-10334. [PMID: 24093663 DOI: 10.1021/jf402523k] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
This study aimed to investigate the regeneration potential of antioxidant capacity of an insoluble food matrix. Investigations were performed in vitro with several food matrices rich in dietary fiber (DF) and bound antioxidants. After removal of the soluble fraction, the antioxidant capacity (AC) of the insoluble fraction was measured by the QUENCHER procedure using ABTS(•+) or DPPH(•) radicals. After measurement, the insoluble residue was washed out to remove the excess of radicals and treated with pure antioxidant solution or antioxidant-rich beverage to regenerate depleted antioxidants on the fiber. Results revealed that the antioxidant capacity of compounds chemically bound to the insoluble moiety could be reconstituted in the presence of other hydrogen-donating substances in the liquid phase. Regeneration efficiency was found to range between 21.5 and 154.3% depending on the type of insoluble food matrix and regeneration agent. Among the food matrices studied, cereal products were found to have slightly higher regeneration efficiency, whereas antioxidant-rich beverages were more effective than pure antioxidants as regeneration agents. Taking wheat bran as reference insoluble material, the regeneration abilities of beverages were in the following order: green tea > espresso coffee > black tea > instant coffee > orange juice > red wine. These results highlighted the possible physiological relevance of antioxidants bound to the insoluble food material in the gastrointestinal tract. During the digestion process they could react with the free radicals and at the same time they can be regenerated by other soluble antioxidant compounds present in the meal.
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Affiliation(s)
- Ecem Evrim Çelik
- Food Engineering Department, Hacettepe University , 06800 Beytepe, Ankara, Turkey
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