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Asefi N, Ebrahimzadegan S, Maleki R, Seiiedlou-Heris SS. Effects of roasting on alkylpyrazin compounds and properties of cocoa powder. JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2023; 60:572-580. [PMID: 36712197 PMCID: PMC9873847 DOI: 10.1007/s13197-022-05640-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 04/07/2022] [Accepted: 10/17/2022] [Indexed: 12/24/2022]
Abstract
The volatile flavor compounds are the most important indicators of the quality of cocoa beans, among which pyrazines are considered as the main and key groups affecting the cocoa flavor. In cocoa processing, roasting is an important stage in the technical treatment of cocoa and has a significant impact on chemical properties of cocoa and its flavor. The present study aimed to assess the impact of roasting (temperature and time) on alkyl pyrazines, as key flavor compounds, via gas chromatography-mass spectrometry. Additionally, other properties, including color, polyphenols, chemical properties, and sensory attributes of cocoa powder were investigated. The results indicated that with the change in roasting time and temperature, these properties changed significantly. The cocoa powder roasted at 140 °C for 40 min had the highest browning index value (OD460/OD525), tetramethylpyrazine to trimethylpyrazine (TMP/TrMP) ratio, and sensory evaluation score and the lowest polyphenol content compared to the other samples.
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Affiliation(s)
- Narmela Asefi
- Department of Food Science and Technology, Tabriz Branch, Faculty of Agriculture, Islamic Azad University, Tabriz, Iran
| | - Samaneh Ebrahimzadegan
- Department of Food Science and Technology, Tabriz Branch, Islamic Azad University, Tabriz, Iran
| | - Ramin Maleki
- Research Department of Chromatography, Urmia Branch, Iranian Academic Center for Education, Culture and Research (ACECR), Urmia, Iran
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2
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Christou A, Stavrou IJ, Kapnissi-Christodoulou CP. Combined use of β-cyclodextrin and ionic liquid as electrolyte additives in EKC for separation and determination of carob's phenolics-A study of the synergistic effect. Electrophoresis 2021; 42:1945-1955. [PMID: 34240758 DOI: 10.1002/elps.202100085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 06/25/2021] [Accepted: 06/29/2021] [Indexed: 11/11/2022]
Abstract
In this work, a simple, reliable, and fast capillary electrophoretic method was developed and validated for the simultaneous determination of 12 polyphenolic compounds, the most frequently found in carob's pulp and seeds. The present work deals with the development of a novel dual electrophoretic system based on the combined use of β-CD and ionic liquid (IL) as buffer additives. A baseline separation of the target analytes was achieved in less than 10 min by using a BGE consisting of 35 mM borate along with 15 mM β-CD and 3 mM l-alanine tert butyl ester lactate (l-AlaC4 Lac) IL as buffer additives at pH 9.5, a temperature of 25°C, and an applied voltage of 30 kV. The application of the developed electrophoretic method to real samples enabled the identification and quantification of the main phenolic constituents of both ripe and unripe carob pulp extracts. The results revealed the predominance of gallic acid in both ripe (183.92 μg/g carob pulp) and unripe (205.10 μg/g carob pulp) carob pulp and highlighted the great influence of the ripening stage on carobs polyphenolic composition, with unripe pods being more enriched in polyphenols (total phenolics detected: 912.58 and 283.13 μg/g unripe and ripe carob pulp).
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Affiliation(s)
| | - Ioannis J Stavrou
- Department of Life Sciences, European University Cyprus, Nicosia, Cyprus
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3
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Navarrete-Yañez V, Garate-Carrillo A, Ayala M, Rodriguez-Castañeda A, Mendoza-Lorenzo P, Ceballos G, Ordoñez-Razo R, Dugar S, Schreiner G, Villarreal F, Ramirez-Sanchez I. Stimulatory effects of (-)-epicatechin and its enantiomer (+)-epicatechin on mouse frontal cortex neurogenesis markers and short-term memory: proof of concept. Food Funct 2021; 12:3504-3515. [PMID: 33900336 DOI: 10.1039/d0fo03084h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Consumption of (-)-epicatechin (Epi), a cacao flavanol improves cognition. The aim was to compare the effects of (-)-Epi or its stereoisomer (+)-Epi on mouse frontal cortex-dependent short-term working memory and modulators of neurogenesis. Three-month-old male mice (n = 7 per group) were provided by gavage either water (vehicle; Veh), (-)-Epi, at 1 mg kg-1 or (+)-Epi at 0.1 mg per kg of body weight for 15 days. After treatment, spontaneous alternation was evaluated by Y-maze. Brain frontal cortex was isolated for nitrate/nitrite measurements, Western blotting for nerve growth factor (NGF), microtubule associated protein 2 (MAP2), endothelial and neuronal nitric oxide synthase (eNOS and nNOS) and immunohistochemistry for neuronal specific protein (NeuN), doublecortin (DCX), capillary (CD31) and neurofilaments (NF200). Results demonstrate the stimulatory capacity of (-)-Epi and (+)-Epi on markers of neuronal proliferation as per increases in immunoreactive cells for NeuN (74 and 120% respectively), DCX (70 and 124%) as well as in NGF (34.4, 63.6%) and MAP2 (41.8, 63.8%). Capillary density yielded significant increases with (-)-Epi (∼80%) vs. (+)-Epi (∼160%). CD31 protein levels increased with (-)-Epi (∼70%) and (+)-Epi (∼140%). Effects correlated with nitrate/nitrite stimulation by (-)-Epi and (+)-Epi (110.2, 246.5%) and enhanced eNOS phosphorylation (Ser1177) with (-)-Epi and (+)-Epi (21.4, 41.2%) while nNOS phosphorylation only increased with (+)-Epi (18%). Neurofilament staining was increased in (-)-Epi by 135.6 and 84% with (+)-Epi. NF200 increased with (-)-Epi (116%) vs. (+)-Epi (84.5%). Frontal cortex-dependent short-term spatial working improved with (-)-Epi and (+)-Epi (15, 13%). In conclusion, results suggest that both enantiomers, but more effectively (+)-Epi, upregulate neurogenesis markers likely through stimulation of capillary formation and NO triggering, improvements in memory.
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Affiliation(s)
- Viridiana Navarrete-Yañez
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico.
| | - Alejandra Garate-Carrillo
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico. and School of Medicine, University of California, San Diego, California, USA
| | - Marcos Ayala
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico.
| | - Antonio Rodriguez-Castañeda
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico.
| | - Patricia Mendoza-Lorenzo
- Division Academica de Ciencias Basicas, Unidad Chontalpa, Universidad Juarez, Autonoma de Tabasco, Tabasco, Mexico
| | - Guillermo Ceballos
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico.
| | - Rosa Ordoñez-Razo
- Unidad de Investigación en Genética Humana, Hospital de Pediatría, Centro Médico SXXI, Instituto Mexicano del Seguro Social, Mexico D.F., Mexico
| | | | | | - Francisco Villarreal
- School of Medicine, University of California, San Diego, California, USA and VA San Diego Health Care System, San Diego, California, USA
| | - Israel Ramirez-Sanchez
- Seccion de Estudios de Posgrado e Investigacion, Escuela Superior de Medicina, Instituto Politecnico Nacional, Mexico D.F., Mexico.
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4
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Pinto G, Aurilia M, Illiano A, Fontanarosa C, Sannia G, Trifuoggi M, Lettera V, Sperandeo R, Pucci P, Amoresano A. From untargeted metabolomics to the multiple reaction monitoring-based quantification of polyphenols in chocolates from different geographical areas. JOURNAL OF MASS SPECTROMETRY : JMS 2021; 56:e4651. [PMID: 32893948 DOI: 10.1002/jms.4651] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 08/19/2020] [Accepted: 08/23/2020] [Indexed: 05/03/2023]
Abstract
Plants, including cocoa bean, are the main source of metabolites with multiple biological functions. Polyphenol extracts are widely used as a nutraceutical supplement for their well-known health-promoting role. In this paper, a preliminary untargeted metabolic screening was carried out by matrix-assisted laser desorption/ionization (MALDI)-time of flight (TOF)/TOF on a pool of chocolate samples made by cocoa beans of different geographical areas. Then, a targeted approach was developed for polyphenol quantification by an optimized Liquid chromatography (LC)-tandem mass spectrometry (MS/MS) method multiple reaction monitoring (MRM) ion mode. Detection limit of polyphenol standard ranged between 1 and 25 pg/μl with variation coefficient lower than 15%. External calibration curves were used for quantification of polyphenols in 18 samples. Fifty polyphenols were detected in a single LC-MRM/MS run and quantified by monitoring almost 90 transitions in a 5-minute run. The polyphenols content of different cocoa beans from several countries was finally compared by principal component analysis (PCA) statistical analysis suggesting that the chocolate made by Ecuador cocoa beans showed the highest level of polyphenols.
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Affiliation(s)
- Gabriella Pinto
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Michela Aurilia
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Anna Illiano
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
- CEINGE Advanced Biotechnology, Università di Napoli 'Federico II', Via Gaetano Salvatore, 486, 80145, Naples, Italy
| | - Carolina Fontanarosa
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Giovanni Sannia
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Marco Trifuoggi
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Vincenzo Lettera
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
| | - Raffaele Sperandeo
- Dipartimento di Scienze, Università degli Studi della Basilicata, Via Nazario Sauro, 85, Potenza, 85100, Italy
| | - Piero Pucci
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
- CEINGE Advanced Biotechnology, Università di Napoli 'Federico II', Via Gaetano Salvatore, 486, 80145, Naples, Italy
| | - Angela Amoresano
- Dipartimento di Scienze Chimiche, Università di Napoli 'Federico II', Via Cinthia, 26, Naples, 80126, Italy
- Istituto Nazionale Biostrutture e Biosistemi, Consorzio Interuniversitario Viale delle, Medaglie d'Oro, 305, Roma, 00136, Italy
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5
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Ottaviani JI, Fong R, Kimball J, Ensunsa JL, Gray N, Vogiatzoglou A, Britten A, Lucarelli D, Luben R, Grace PB, Mawson DH, Tym A, Wierzbicki A, Smith AD, Wareham NJ, Forouhi NG, Khaw KT, Schroeter H, Kuhnle GGC. Evaluation of (-)-epicatechin metabolites as recovery biomarker of dietary flavan-3-ol intake. Sci Rep 2019; 9:13108. [PMID: 31511603 PMCID: PMC6739331 DOI: 10.1038/s41598-019-49702-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 08/29/2019] [Indexed: 12/16/2022] Open
Abstract
Data from dietary intervention studies suggest that intake of (−)-epicatechin mediates beneficial vascular effects in humans. However, population-based investigations are required to evaluate associations between habitual intake and health and these studies rely on accurate estimates of intake, which nutritional biomarkers can provide. Here, we evaluate a series of structurally related (−)-epicatechin metabolites (SREM), particularly (−)-epicatechin-3′-glucuronide, (−)-epicatechin-3′-sulfate and 3′-O-methyl-(−)-epicatechin-5-sulfate (SREMB), as flavan-3-ol and (−)-epicatechin intake. SREMB in urine proved to be a specific indicator of (−)-epicatechin intake, showing also a strong correlation with the amount of (−)-epicatechin ingested (R2: 0.86 (95% CI 0.8l; 0.92). The median recovery of (−)-epicatechin as SREMB in 24 h urine was 10% (IQR 7–13%) and we found SREMB in the majority of participants of EPIC Norfolk (83% of 24,341) with a mean concentration of 2.4 ± 3.2 µmol/L. Our results show that SREMB are suitable as biomarker of (−)-epicatechin intake. According to evaluation criteria from IARC and the Institute of Medicine, the results obtained support use of SREMB as a recovery biomarker to estimate actual intake of (−)-epicatechin.
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Affiliation(s)
| | | | | | | | - Nicola Gray
- Department of Food and Nutritional Sciences, University of Reading, Reading, UK
| | | | - Abigail Britten
- MRC Epidemiology Unit, University of Cambridge, Cambridge, UK
| | | | - Robert Luben
- Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | | | | | - Amy Tym
- LGC, Newmarket Road, Fordham, UK
| | | | - A David Smith
- OPTIMA Department of Pharmacology, University of Oxford, Oxford, UK
| | | | - Nita G Forouhi
- MRC Epidemiology Unit, University of Cambridge, Cambridge, UK
| | - Kay-Tee Khaw
- Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
| | | | - Gunter G C Kuhnle
- Department of Food and Nutritional Sciences, University of Reading, Reading, UK. .,Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK.
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6
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Marques LLM, Ferreira EDF, Paula MND, Klein T, Mello JCPD. Paullinia cupana: a multipurpose plant – a review. REVISTA BRASILEIRA DE FARMACOGNOSIA-BRAZILIAN JOURNAL OF PHARMACOGNOSY 2019. [DOI: 10.1016/j.bjp.2018.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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7
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Moreno-Ulloa A, Nájera-García N, Hernández M, Ramírez-Sánchez I, Taub PR, Su Y, Beltrán-Partida E, Ceballos G, Dugar S, Schreiner G, Best BM, Ciaraldi TP, Henry RR, Villarreal F. A pilot study on clinical pharmacokinetics and preclinical pharmacodynamics of (+)-epicatechin on cardiometabolic endpoints. Food Funct 2018; 9:307-319. [PMID: 29171848 PMCID: PMC5783763 DOI: 10.1039/c7fo01028a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We reported that (-)-epicatechin can stimulate mitochondria biogenesis and improve metabolism. However, preliminary studies indicate that the (+) stereoisomer form may be more potent. We evaluated in a preliminary manner, the pharmacokinetics (PK) and initial safety analysis of (+)-epicatechin ((+)-Epi) in healthy and pre-diabetic subjects. Using a mouse model of diet-induced obesity and insulin resistance, we also evaluated the metabolic effects of (+)-Epi vs. (+)-catechin (Cat) to determine class effects. In the Phase I PK study, subjects were provided a single incremental oral dose of (+)-Epi (10, 30 or 100 mg). For the PD study, subjects were provided a single 30 mg dose per day for 7 days. Blood samples were collected and safety measures were performed. Incremental doses of (+)-Epi increase the half-life of blood metabolites from 1.2-4.9 h. The compound was well tolerated and no adverse effects were reported. Seven day dosing of pre-diabetic subjects led to tendencies for reductions in circulating levels of tumor necrosis factor-α and monocyte chemoattractant protein-1, which returned to baseline by 7 days after treatment. In animals, 2 weeks of oral dosing (0.003, 0.01, 0.03, 0.1 and 0.3 mg kg-1 day-1) dose dependently improved metabolism-related endpoints (weight gain, glucose, cholesterol, triglyceride, with thresholds as low as 0.01 mg kg-1 day-1). Cat yielded no effects at 0.1 mg kg-1 day-1. Results indicate that (+)-Epi evidences a favorable PK and safety profile. Using a pre-clinical model, the compound positively modulates metabolism, which may link to mitochondrial effects. Effects are not due to general antioxidant actions, as Cat yielded no effects.
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8
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Quantification of Catechin and Epicatechin in Foods by Enzymatic-Spectrophotometric Method with Tyrosinase. FOOD ANAL METHOD 2017. [DOI: 10.1007/s12161-017-0955-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Kang KB, Kim HW, Kim JW, Oh WK, Kim J, Sung SH. Catechin-Bound Ceanothane-Type Triterpenoid Derivatives from the Roots of Zizyphus jujuba. JOURNAL OF NATURAL PRODUCTS 2017; 80:1048-1054. [PMID: 28257196 DOI: 10.1021/acs.jnatprod.6b01103] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Three unprecedented ceanothane-type triterpenoids, ent-epicatechinoceanothic acid A (1), ent-epicatechinoceanothic acid B (2), and epicatechino-3-deoxyceanothetric acid A (3), containing C-C bond linkages with catechin moieties, were isolated from the roots of Zizyphus jujuba. Their chemical structures, including absolute configurations, were established by spectroscopic analysis and calculation of their ECD spectra. A possible biogenetic pathway for C-C bond formation between the catechin and the triterpenoid moieties is presented. Compound 1 was evaluated for its antiproliferative activity on HSC-T6 hepatic stellate cells.
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Affiliation(s)
- Kyo Bin Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
| | - Hyun Woo Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
| | - Jung Wha Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
| | - Won Keun Oh
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
| | - Jinwoong Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
| | - Sang Hyun Sung
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University , Seoul 08826, Republic of Korea
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10
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Wang XF, Sun YK, Sun K, Ding YZ, Yuan RJ. Review: Separation and Pharmacology of Chiral Compounds in Traditional Chinese Medicine. ANAL LETT 2016. [DOI: 10.1080/00032719.2016.1169540] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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11
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Aydoğan C, Karakoç V, Denizli A. Chiral ligand-exchange separation and determination of malic acid enantiomers in apple juice by open-tubular capillary electrochromatography. Food Chem 2015; 187:130-4. [DOI: 10.1016/j.foodchem.2015.04.062] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 04/15/2015] [Accepted: 04/17/2015] [Indexed: 10/23/2022]
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12
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Qian Y, Zhao X, Zhao L, Cui L, Liu L, Jiang X, Liu Y, Gao L, Xia T. Analysis of stereochemistry and biosynthesis of epicatechin in tea plants by chiral phase high performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1006:1-7. [PMID: 26519617 DOI: 10.1016/j.jchromb.2015.10.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 10/16/2015] [Accepted: 10/16/2015] [Indexed: 10/22/2022]
Abstract
Tea (Camellia sinensis) is rich in flavan-3-ols (catechins), especially epicatechin (EC), which is the predominant extension unit of polymeric proanthocyanidins (PAs). However, studies assessing EC's stereochemistry are scarce. Here, a high performance liquid chromatography column using amylose tris-(3, 5-dimethylphenylcarbamate) immobilized on silica-gel as chiral stationary phases (CSPs) was applied to explore its stereochemistry and biosynthetic pathway in tea plants. The results revealed (-)-epicatechin [(-)-EC] was the predominant di-hyroxy-non-galloylated-catechins, while (+)-epicatechin [(+)-EC] was not detected. Interestingly, (-)-EC was the only product obtained from cyanidin using the partially purified native C. sinensis anthocyanidin reductase (CsANR) in the presence of reduction nicotinamide adenine dinucleotide phosphate (NADPH); meanwhile, (+)-EC was the main product using recombinant CsANR in the same conditions. In addition, (-)-EC could be obtained from (+)-catechin [(+)-C] using recombinant CsANR, which displayed C3-epimerase activity in the presence of oxidation nicotinamide adenine dinucleotide phosphate (NADP(+)). But the partially purified native CsANR did not possess this function. Finally, (-)-EC could result from the de-gallate acid reaction of epicatechin gallate (ECG) catalyzed by a novel partially purified native galloylated catechins hydrolase (GCH) from tea leaves. In summary, (-)-EC is likely the product of native protein from the tea plants, and (+)-EC is only produced in a reaction catalyzed by recombinant CsANR in vitro.
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Affiliation(s)
- Yumei Qian
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China; School of Biological and Food Engineering, Suzhou University, 49 Middle Bianhe Rd., Suzhou 234000 Anhui, China
| | - Xianqian Zhao
- School of Life Science, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China
| | - Lei Zhao
- College of Horticulture, Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plants, Qingdao Agricultural University, 700Changcheng Rd., Qingdao 266109 Shandong, China
| | - Lilan Cui
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China
| | - Li Liu
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China
| | - Xiaolan Jiang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China
| | - Yajun Liu
- School of Life Science, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China
| | - Liping Gao
- School of Life Science, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China.
| | - Tao Xia
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 West Changjiang Rd., Hefei 230036 Anhui, China.
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13
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Schimpl FC, da Silva JF, Gonçalves JFDC, Mazzafera P. Guarana: revisiting a highly caffeinated plant from the Amazon. JOURNAL OF ETHNOPHARMACOLOGY 2013; 150:14-31. [PMID: 23981847 DOI: 10.1016/j.jep.2013.08.023] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 08/07/2013] [Accepted: 08/16/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Guarana (Paullinia cupana Kunth var. sorbilis (Mart.) Ducke) has been traditionally consumed by indigenous communities of the Amazon region. It is valued mainly for its stimulant property because of its high content of caffeine, which can be up to 6% in the seeds. AIM OF THE REVIEW The purpose of this review is to revisit this typically Brazilian plant, addressing economic considerations, the chemical makeup of the seeds and pharmacological properties so far investigated. RESULTS Guarana is primarily produced in the Brazilian states of Amazonas and Bahia, and approximately 70% of the production is used by the industry of soft and energy drinks. The other 30% becomes guarana powder for direct consumption in capsules or dilution in water, or it serves as a raw material for the pharmaceutical and cosmetics industries. In addition to its stimulant property, guarana has other therapeutic properties, which have aroused the interest of the scientific community. CONCLUSION This review shows that other guarana properties may be explored and how scarce are the studies regarding agronomic, plant pathology, physiology and breeding. So far, caffeine has been the main reason to study guarana and still will lead the researches because the demand for this alkaloid by food and pharmaceutical industry, and a strongly growing market related with beauty products. However, guarana has other components and there is great interest in studies designed to elucidate the effects of guarana's bioactive components and their potential pharmacological applications. Significant part of the guarana production in Brazil still comes from Indians tribes in the Amazon State, and any improvement in this plant, in any aspect, may propitiate a positive economic impact in their lives.
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Affiliation(s)
- Flávia Camila Schimpl
- Departamento de Biologia Vegetal, Instituto de Biologia, CP9109, Universidade Estadual de Campinas, 13083-970, Campinas, SP 13083-970, Brazil
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14
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Ismail NA, Posma JM, Frost G, Holmes E, Garcia-Perez I. The role of metabonomics as a tool for augmenting nutritional information in epidemiological studies. Electrophoresis 2013; 34:2776-86. [PMID: 23893902 DOI: 10.1002/elps.201300066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 07/04/2013] [Accepted: 07/12/2013] [Indexed: 11/07/2022]
Abstract
Most chronic diseases have been demonstrated to have a link to nutrition. Within food and nutritional research there is a major driver to understand the relationship between diet and disease in order to improve health of individuals. However, the lack of accurate dietary intake assessment in free-living populations, makes accurate estimation of how diet is associated with disease risk difficulty. Thus, there is a pressing need to find solutions to the inaccuracy of dietary reporting. Metabolic profiling of urine or plasma can provide an unbiased approach to characterizing dietary intake and various high-throughput analytical platforms have been used in order to implement targeted and nontargeted assays in nutritional clinical trials and nutritional epidemiology studies. This review describes first the challenges presented in interpreting the relationship between diet and health within individual and epidemiological frameworks. Second, we aim to explore how metabonomics can benefit different types of nutritional studies and discuss the critical importance of selecting appropriate analytical techniques in these studies. Third, we propose a strategy capable of providing accurate assessment of food intake within an epidemiological framework in order establish accurate associations between diet and health.
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Affiliation(s)
- Nurhafzan A Ismail
- Division of Endocrinology and Metabolism, Nutrition and Dietetic Research Group, Imperial College London, London, United Kingdom
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Brennan JC, Denison MS, Holstege DM, Magiatis P, Dallas JL, Gutierrez EG, Soshilov AA, Millam JR. 2,3-cis-2R,3R-(-)-epiafzelechin-3-O-p-coumarate, a novel flavan-3-ol isolated from Fallopia convolvulus seed, is an estrogen receptor agonist in human cell lines. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 13:133. [PMID: 23768005 PMCID: PMC3695784 DOI: 10.1186/1472-6882-13-133] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 05/22/2013] [Indexed: 02/08/2023]
Abstract
Background The plant genus Fallopia is well-known in Chinese traditional medicine and includes many species that contain bioactive compounds, namely phytoestrogens. Consumption of phytoestrogens may be linked to decreased incidence of breast and prostate cancers therefore discovery of novel phytoestrogens and novel sources of phytoestrogens is of interest. Although phytoestrogen content has been analyzed in the rhizomes of various Fallopia sp., seeds of a Fallopia sp. have never been examined for phytoestrogen presence. Methods Analytical chemistry techniques were used with guidance from an in vitro estrogen receptor bioassay (a stably transfected human ovarian carcinoma cell line) to isolate and identify estrogenic components from seeds of Fallopia convolvulus. A transiently transfected human breast carcinoma cell line was used to characterize the biological activity of the isolated compounds on estrogen receptors (ER) α and β. Results Two compounds, emodin and the novel flavan-3-ol, (−)-epiafzelechin-3-O-p-coumarate (rhodoeosein), were identified to be responsible for estrogenic activity of F. convolvulus seed extract. Absolute stereochemistry of rhodoeosein was determined by 1 and 2D NMR, optical rotation and circular dichroism. Emodin was identified by HPLC/DAD, LC/MS/MS, and FT/ICR-MS. When characterizing the ER specificity in biological activity of rhodoeosein and emodin, rhodoeosein was able to exhibit a four-fold greater relative estrogenic potency (REP) in breast cells transiently-transfected with ERβ as compared to those transfected with ERα, and emodin exhibited a six-fold greater REP in ERβ-transfected breast cells. Cell type-specific differences were observed with rhodoeosein but not emodin; rhodoeosein produced superinduction of reporter gene activity in the human ovarian cell line (> 400% of maximum estradiol [E2] induction) but not in the breast cell line. Conclusion This study is the first to characterize the novel flavan-3-ol compound, rhodoeosein, and its ability to induce estrogenic activity in human cell lines. Rhodoeosein and emodin may have potential therapeutic applications as natural products activating ERβ, and further characterization of rhodoeosein is necessary to evaluate its selectivity as a cell type-specific ER agonist.
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Characterization of flavan-3-ols in seeds of grape pomace by CE, HPLC-DAD-MSn and LC-ESI-FTICR-MS. Food Res Int 2012. [DOI: 10.1016/j.foodres.2012.07.001] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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17
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Klein T, Longhini R, de Mello JCP. Development of an analytical method using reversed-phase HPLC-PDA for a semipurified extract of Paullinia cupana var. sorbilis (guaraná). Talanta 2012; 88:502-6. [DOI: 10.1016/j.talanta.2011.11.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 11/04/2011] [Accepted: 11/07/2011] [Indexed: 11/16/2022]
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18
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Rabanes HR, Guidote AM, Quirino JP. Capillary electrophoresis of natural products: Highlights of the last five years (2006-2010). Electrophoresis 2011; 33:180-95. [DOI: 10.1002/elps.201100223] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2011] [Revised: 09/22/2011] [Accepted: 09/22/2011] [Indexed: 12/14/2022]
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19
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Puiggròs F, Solà R, Bladé C, Salvadó MJ, Arola L. Nutritional biomarkers and foodomic methodologies for qualitative and quantitative analysis of bioactive ingredients in dietary intervention studies. J Chromatogr A 2011; 1218:7399-414. [PMID: 21917262 DOI: 10.1016/j.chroma.2011.08.051] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 08/04/2011] [Accepted: 08/09/2011] [Indexed: 01/16/2023]
Abstract
Traditional dietary assessment methods, such as 24-h recalls, weighted food diaries and food frequency questionnaires (FFQs) are highly subjective and impair the assessment of successfully accomplished dietary interventions. Foodomic technologies offer promising methodologies for gathering scientific evidence from clinical trials with sensitive methods (e.g., GC-MS, LC-MS, CE, NMR) to detect and quantify markers of nutrient exposure or subtle changes in dietary patterns. This review provides a summary of recently developed foodomic methodologies for the detection of suggested biomarkers, including the food specificity for each suggested biomarker and a brief description of the key aspects of 24-h recalls that may affect marker detection and stability, such as mixed nutrients and cooking processes. The primary aim of this review is to contribute to the assessment of the metabolic effects of active ingredients and foods using cutting-edge methods to improve approaches to future nutritional programs tailored for health maintenance and disease prevention.
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Affiliation(s)
- Francesc Puiggròs
- Centre Tecnològic de Nutrició i Salut (CTNS), TECNIO, Universitat Rovira i Virgili, Reus, Spain
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Kwon CH, Jeong DH, Jung SH. Chiral Separation of Catechin by Capillary Electrophoresis with α-Cyclosophorooctadecaose Isolated from Rhodobacter sphaeroides as Chiral Selectors. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.4.1361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Jeon Y, Kwon C, Cho E, Jung S. Carboxymethylated cyclosophoraose as a novel chiral additive for the stereoisomeric separation of some flavonoids by capillary electrophoresis. Carbohydr Res 2010; 345:2408-12. [DOI: 10.1016/j.carres.2010.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2010] [Revised: 08/13/2010] [Accepted: 08/16/2010] [Indexed: 10/19/2022]
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22
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Rinaldo D, Batista JM, Rodrigues J, Benfatti AC, Rodrigues CM, dos Santos LC, Furlan M, Vilegas W. Determination of catechin diastereomers from the leaves of Byrsonima species using chiral HPLC-PAD-CD. Chirality 2010; 22:726-33. [PMID: 20143413 DOI: 10.1002/chir.20824] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
When catechins are found in plant extracts, they are almost always identified as catechin and/or epicatechin probably due to stereoselectivity of the enzymes involved in the biosynthesis of these substances. However, the lack of reports regarding to ent-catechin as well as ent-epicatechin does not necessarily mean that these compounds have not been produced. In fact, most of the previous reports used chromatographic conditions not suitable for such separation. This article describes a simple and reliable analytical HPLC-PAD-CD method for simultaneous determination of catechin diastereomers both in infusions and extracts from the leaves of Byrsonima species. The direct separation of catechin, ent-catechin, epicatechin, and ent-epicatechin was obtained in normal phase by HPLC-PAD-CD using Chiralcel OD-H as chiral stationary phase and n-hexane/ethanol with 0.1% of TFA as mobile phase.
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Affiliation(s)
- Daniel Rinaldo
- Institute of Chemistry, São Paulo State University, Unesp, Francisco Degni Street, Araraquara-SP, Brazil
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23
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Application and potential of capillary electroseparation methods to determine antioxidant phenolic compounds from plant food material. J Pharm Biomed Anal 2010; 53:1130-60. [PMID: 20719447 DOI: 10.1016/j.jpba.2010.07.028] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 07/09/2010] [Accepted: 07/18/2010] [Indexed: 12/17/2022]
Abstract
Antioxidants are one of the most common active ingredients of nutritionally functional foods which can play an important role in the prevention of oxidation and cellular damage inhibiting or delaying the oxidative processes. In recent years there has been an increased interest in the application of antioxidants to medical treatment as information is constantly gathered linking the development of human diseases to oxidative stress. Within antioxidants, phenolic molecules are an important category of compounds, commonly present in a wide variety of plant food materials. Their correct determination is pivotal nowadays and involves their extraction from the sample, analytical separation, identification, quantification and interpretation of the data. The aim of this review is to provide an overview about all the necessary steps of any analytical procedure to achieve the determination of phenolic compounds from plant matrices, paying particular attention to the application and potential of capillary electroseparation methods. Since it is quite complicated to establish a classification of plant food material, and to structure the current review, we will group the different matrices as follows: fruits, vegetables, herbs, spices and medicinal plants, beverages, vegetable oils, cereals, legumes and nuts and other matrices (including cocoa beans and bee products). At the end of the overview, we include two sections to explain the usefulness of the data about phenols provided by capillary electrophoresis and the newest trends.
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Herrero M, Simó C, García-Cañas V, Fanali S, Cifuentes A. Chiral capillary electrophoresis in food analysis. Electrophoresis 2010; 31:2106-14. [DOI: 10.1002/elps.200900770] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Herrero M, García-Cañas V, Simo C, Cifuentes A. Recent advances in the application of capillary electromigration methods for food analysis and Foodomics. Electrophoresis 2010; 31:205-28. [PMID: 19967713 DOI: 10.1002/elps.200900365] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The use of capillary electromigration methods to analyze foods and food components is reviewed in this work. Papers that were published during the period April 2007 to March 2009 are included following the previous review by García-Cañas and Cifuentes (Electrophoresis, 2008, 29, 294-309). These works include the analysis of amino acids, biogenic amines, peptides, proteins, DNAs, carbohydrates, phenols, polyphenols, pigments, toxins, pesticides, vitamins, additives, small organic and inorganic ions and other compounds found in foods and beverages, as well as those applications of CE for monitoring food interactions and food processing. The use of microchips, CE-MS, chiral-CE as well as other foreseen trends in food analysis are also discussed including their possibilities in the very new field of Foodomics.
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Affiliation(s)
- Miguel Herrero
- Departamento de Caracterización de Alimentos, Instituto de Fermentaciones Industriales, Madrid 28006, Spain
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26
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Proanthocyanidins and a phloroglucinol derivative from Rumex acetosa L. Fitoterapia 2009; 80:483-95. [DOI: 10.1016/j.fitote.2009.08.015] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Accepted: 08/09/2009] [Indexed: 11/24/2022]
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27
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Kim H, Choi Y, Lim J, Paik SR, Jung S. Chiral separation of catechin by capillary electrophoresis using mono-, di-, tri-succinyl-β-cyclodextrin as chiral selectors. Chirality 2009; 21:937-42. [DOI: 10.1002/chir.20696] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Kwon C, Yoo KM, Jung S. Chiral separation and discrimination of catechin by sinorhizobial octasaccharides in capillary electrophoresis and 13C NMR spectroscopy. Carbohydr Res 2009; 344:1347-51. [DOI: 10.1016/j.carres.2009.05.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Accepted: 05/14/2009] [Indexed: 11/25/2022]
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29
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Molecular Modeling Studies on the Chiral Separation of (±)-Catechins by Mono-succinyl-β-cyclodextrin. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.6.1373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Preinerstorfer B, Lämmerhofer M, Lindner W. Advances in enantioselective separations using electromigration capillary techniques. Electrophoresis 2009; 30:100-32. [DOI: 10.1002/elps.200800607] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Jalil AMM, Ismail A. Polyphenols in cocoa and cocoa products: is there a link between antioxidant properties and health? Molecules 2008; 13:2190-219. [PMID: 18830150 PMCID: PMC6245372 DOI: 10.3390/molecules13092190] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2008] [Revised: 08/29/2008] [Accepted: 09/02/2008] [Indexed: 01/17/2023] Open
Abstract
Cocoa and cocoa products have received much attention due to their significant polyphenol contents. Cocoa and cocoa products, namely cocoa liquor, cocoa powder and chocolates (milk and dark chocolates) may present varied polyphenol contents and possess different levels of antioxidant potentials. For the past ten years, at least 28 human studies have been conducted utilizing one of these cocoa products. However, questions arise on which of these products would deliver the best polyphenol contents and antioxidant effects. Moreover, the presence of methylxanthines, peptides, and minerals could synergistically enhance or reduce antioxidant properties of cocoa and cocoa products. To a greater extent, cocoa beans from different countries of origins and the methods of preparation (primary and secondary) could also partially influence the antioxidant polyphenols of cocoa products. Hence, comprehensive studies on the aforementioned factors could provide the understanding of health-promoting activities of cocoa or cocoa products components.
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Affiliation(s)
| | - Amin Ismail
- Author to whom correspondence should be addressed; E-mail: ; Tel.: +603- 89472435; Fax: +603-89426769
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32
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Scriba GKEV. Cyclodextrins in capillary electrophoresis enantioseparations--recent developments and applications. J Sep Sci 2008; 31:1991-2011. [PMID: 18491357 DOI: 10.1002/jssc.200800095] [Citation(s) in RCA: 140] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Capillary EKC has been established as a versatile and robust CE method for the separation of enantiomers. Within the chiral selectors added to the BGE CDs continue as the most widely used selectors due to their structural variety and commercial availability. This is reflected in the large number of practical applications of CDs to analytical enantioseparations that have been reported between January 2006 and January 2008, the period of time covered by this review. Most of these applications cover aspects of life sciences such as drug analysis, bioanalysis, environmental analysis, or food analysis. Moreover, new CD derivatives have been developed in an attempt to achieve altered enantioselectivities and to further broaden the application range. Finally, efforts will be summarized that aim at an understanding of the molecular level of the chiral recognition between CDs and the analytes.
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Affiliation(s)
- Gerhard K E V Scriba
- Department of Pharmaceutical Chemistry, School of Pharmacy, Friedrich Schiller University, Philosophenweg 14, D-07743 Jena, Germany.
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33
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Affiliation(s)
- Timothy J Ward
- Millsaps College 1701 North State Street, Box 150306, Jackson, Mississippi 39210, USA.
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Kofink M, Papagiannopoulos M, Galensa R. (-)-Catechin in cocoa and chocolate: occurrence and analysis of an atypical flavan-3-ol enantiomer. Molecules 2007; 12:1274-88. [PMID: 17909484 PMCID: PMC6149454 DOI: 10.3390/12071274] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Revised: 07/02/2007] [Accepted: 07/02/2007] [Indexed: 01/26/2023] Open
Abstract
Cocoa contains high levels of different flavonoids. In the present study, the enantioseparation of catechin and epicatechin in cocoa and cocoa products by chiral capillary electrophoresis (CCE) was performed. A baseline separation of the catechin and epicatechin enantiomers was achieved by using 0.1 mol x L(-1) borate buffer (pH 8.5) with 12 mmol x L(-1) (2-hydroxypropyl)-gamma-cyclodextrin as chiral selector, a fused-silica capillary with 50 cm effective length (75 microm I.D.), +18 kV applied voltage, a temperature of 20 degrees C and direct UV detection at 280 nm. To avoid comigration or coelution of other similar substances, the flavan-3-ols were isolated and purified using polyamide-solid-phase-extraction and LC-MS analysis. As expected, we found (-)-epicatechin and (+)-catechin in unfermented, dried, unroasted cocoa beans. In contrast, roasted cocoa beans and cocoa products additionally contained the atypical flavan-3-ol (-)-catechin. This is generally formed during the manufacturing process by an epimerization which converts (-)-epicatechin to its epimer (-)-catechin. High temperatures during the cocoa bean roasting process and particularly the alkalization of the cocoa powder are the main factors inducing the epimerization reaction. In addition to the analysis of cocoa and cocoa products, peak ratios were calculated for a better differentiation of the cocoa products.
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Affiliation(s)
- Michael Kofink
- University of Bonn, Department of Nutrition and Food Sciences, Research Area: Food Chemistry I, Endenicher Allee 11-13, 53115 Bonn, Germany.
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