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Favari C, Rinaldi de Alvarenga JF, Sánchez-Martínez L, Tosi N, Mignogna C, Cremonini E, Manach C, Bresciani L, Del Rio D, Mena P. Factors driving the inter-individual variability in the metabolism and bioavailability of (poly)phenolic metabolites: A systematic review of human studies. Redox Biol 2024; 71:103095. [PMID: 38428187 PMCID: PMC10912651 DOI: 10.1016/j.redox.2024.103095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/16/2024] [Accepted: 02/18/2024] [Indexed: 03/03/2024] Open
Abstract
This systematic review provides an overview of the available evidence on the inter-individual variability (IIV) in the absorption, distribution, metabolism, and excretion (ADME) of phenolic metabolites and its determinants. Human studies were included investigating the metabolism and bioavailability of (poly)phenols and reporting IIV. One hundred fifty-three studies met the inclusion criteria. Inter-individual differences were mainly related to gut microbiota composition and activity but also to genetic polymorphisms, age, sex, ethnicity, BMI, (patho)physiological status, and physical activity, depending on the (poly)phenol sub-class considered. Most of the IIV has been poorly characterised. Two major types of IIV were observed. One resulted in metabolite gradients that can be further classified into high and low excretors, as seen for all flavonoids, phenolic acids, prenylflavonoids, alkylresorcinols, and hydroxytyrosol. The other type of IIV is based on clusters of individuals defined by qualitative differences (producers vs. non-producers), as for ellagitannins (urolithins), isoflavones (equol and O-DMA), resveratrol (lunularin), and preliminarily for avenanthramides (dihydro-avenanthramides), or by quali-quantitative metabotypes characterized by different proportions of specific metabolites, as for flavan-3-ols, flavanones, and even isoflavones. Future works are needed to shed light on current open issues limiting our understanding of this phenomenon that likely conditions the health effects of dietary (poly)phenols.
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Affiliation(s)
- Claudia Favari
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy.
| | | | - Lorena Sánchez-Martínez
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy; Department of Food Technology, Food Science and Nutrition, Faculty of Veterinary Sciences, Regional Campus of International Excellence 'Campus Mare Nostrum', Biomedical Research Institute of Murcia (IMIB-Arrixaca-UMU), University Clinical Hospital 'Virgen de La Arrixaca', Universidad de Murcia, Espinardo, Murcia, Spain
| | - Nicole Tosi
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy
| | - Cristiana Mignogna
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy
| | - Eleonora Cremonini
- Department of Nutrition, University of California, Davis, CA, USA; Department of Environmental Toxicology, University of California, Davis, CA, USA
| | - Claudine Manach
- Université Clermont Auvergne, INRAE, Human Nutrition Unit, Clermont-Ferrand, France
| | - Letizia Bresciani
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy
| | - Daniele Del Rio
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy; Microbiome Research Hub, University of Parma, 43124, Parma, Italy
| | - Pedro Mena
- Human Nutrition Unit, Department of Food and Drugs, University of Parma, Parma, Italy; Microbiome Research Hub, University of Parma, 43124, Parma, Italy
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Polia F, Pastor-Belda M, Martínez-Blázquez A, Horcajada MN, Tomás-Barberán FA, García-Villalba R. Technological and Biotechnological Processes To Enhance the Bioavailability of Dietary (Poly)phenols in Humans. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:2092-2107. [PMID: 35156799 PMCID: PMC8880379 DOI: 10.1021/acs.jafc.1c07198] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 01/24/2022] [Accepted: 01/27/2022] [Indexed: 06/10/2023]
Abstract
The health effects of (poly)phenols (PPs) depend upon their bioavailability that, in general, is very low and shows a high interindividual variability. The low bioavailability of PPs is mainly attributed to their low absorption in the upper gastrointestinal tract as a result of their low water solubility, their presence in foods as polymers or in glycosylated forms, and their tight bond to food matrices. Although many studies have investigated how technological and biotechnological processes affect the phenolic composition of fruits and vegetables, limited information exists regarding their effects on PP bioavailability in humans. In the present review, the effect of food processing (mechanical, thermal, and non-thermal treatments), oral-delivery nanoformulations, enzymatic hydrolysis, fermentation, co-administration with probiotics, and generation of postbiotics in PP bioavailability have been overviewed, focusing in the evidence provided in humans.
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Affiliation(s)
- Franck Polia
- Laboratory
of Food & Health, Research Group on Quality, Safety and Bioactivity
of Plant Foods, Centro de Edafología
y Biología Aplicada del Segura−Consejo Superior de Investigaciones
Científicas (CEBAS−CSIC), Campus de Espinardo 25, 30100 Murcia, Spain
| | - Marta Pastor-Belda
- Department
of Analytical Chemistry, Faculty of Chemistry, Regional Campus of
International Excellence “Campus Mare Nostrum”, University of Murcia, 30100 Murcia, Spain
| | - Alberto Martínez-Blázquez
- Laboratory
of Food & Health, Research Group on Quality, Safety and Bioactivity
of Plant Foods, Centro de Edafología
y Biología Aplicada del Segura−Consejo Superior de Investigaciones
Científicas (CEBAS−CSIC), Campus de Espinardo 25, 30100 Murcia, Spain
| | | | - Francisco A. Tomás-Barberán
- Laboratory
of Food & Health, Research Group on Quality, Safety and Bioactivity
of Plant Foods, Centro de Edafología
y Biología Aplicada del Segura−Consejo Superior de Investigaciones
Científicas (CEBAS−CSIC), Campus de Espinardo 25, 30100 Murcia, Spain
| | - Rocío García-Villalba
- Laboratory
of Food & Health, Research Group on Quality, Safety and Bioactivity
of Plant Foods, Centro de Edafología
y Biología Aplicada del Segura−Consejo Superior de Investigaciones
Científicas (CEBAS−CSIC), Campus de Espinardo 25, 30100 Murcia, Spain
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Messina M, Mejia SB, Cassidy A, Duncan A, Kurzer M, Nagato C, Ronis M, Rowland I, Sievenpiper J, Barnes S. Neither soyfoods nor isoflavones warrant classification as endocrine disruptors: a technical review of the observational and clinical data. Crit Rev Food Sci Nutr 2021; 62:5824-5885. [PMID: 33775173 DOI: 10.1080/10408398.2021.1895054] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Soybeans are a rich source of isoflavones, which are classified as phytoestrogens. Despite numerous proposed benefits, isoflavones are often classified as endocrine disruptors, based primarily on animal studies. However, there are ample human data regarding the health effects of isoflavones. We conducted a technical review, systematically searching Medline, EMBASE, and the Cochrane Library (from inception through January 2021). We included clinical studies, observational studies, and systematic reviews and meta-analyses (SRMA) that examined the relationship between soy and/or isoflavone intake and endocrine-related endpoints. 417 reports (229 observational studies, 157 clinical studies and 32 SRMAs) met our eligibility criteria. The available evidence indicates that isoflavone intake does not adversely affect thyroid function. Adverse effects are also not seen on breast or endometrial tissue or estrogen levels in women, or testosterone or estrogen levels, or sperm or semen parameters in men. Although menstrual cycle length may be slightly increased, ovulation is not prevented. Limited insight could be gained about possible impacts of in utero isoflavone exposure, but the existing data are reassuring. Adverse effects of isoflavone intake were not identified in children, but limited research has been conducted. After extensive review, the evidence does not support classifying isoflavones as endocrine disruptors.
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Affiliation(s)
- Mark Messina
- Department of Nutrition, Loma Linda University, Loma Linda, California, USA
| | - Sonia Blanco Mejia
- Department of Nutritional Sciences, University of Toronto, Toronto, Canada
| | - Aedin Cassidy
- Nutrition and Preventive Medicine, Queen's University, Belfast, Northern Ireland, UK
| | - Alison Duncan
- College of Biological Sciences, University of Guelph, Guelph, Canada
| | - Mindy Kurzer
- Department of Food Science and Nutrition, University of Minnesota, Minneapolis, Minnesota, USA
| | - Chisato Nagato
- Graduate School of Medicine, Gifu University, Gifu, Japan
| | - Martin Ronis
- Health Sciences Center, Louisiana State University Health Sciences Center, Baton Rouge, New Orleans, USA
| | - Ian Rowland
- Human Nutrition, University of Reading, Reading, England, UK
| | | | - Stephen Barnes
- Department of Pharmacology and Toxicology, University of Alabama, Alabama, USA
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Jang HH, Lee YM, Choe JS, Kwon O. Validation of soy isoflavone intake and its health effects: a review of the development of exposure biomarkers. Nutr Res Pract 2021; 15:1-11. [PMID: 33542788 PMCID: PMC7838478 DOI: 10.4162/nrp.2021.15.1.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/25/2020] [Accepted: 07/21/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND/OBJECTIVES It is difficult to consistently demonstrate the health effects of soy isoflavones owing to the multitude of factors contributing to their bioavailability. To accurately verify these health effects, dietary isoflavone intake should be measured using a biologically active dose rather than an intake dose. This concept has been expanded to the development of new exposure biomarkers in nutrition research. This review aims to provide an overview of the development of exposure biomarkers and suggest a novel research strategy for identifying the health effects of soy isoflavone intake. MATERIALS/METHODS We cover recent studies on the health effects of soy isoflavones focusing on isoflavone metabolites as exposure biomarkers. RESULTS Compared to non-fermented soy foods, fermented soy foods cause an increased concentration of isoflavones in the biofluid immediately following ingestion. The correlation between exposure biomarkers in blood and urine and the food frequency questionnaire was slightly lower than that of corresponding 24-h dietary recalls. Urinary and blood isoflavone levels did not show a consistent association with chronic disease and cancer risk. CONCLUSION It is crucial to understand the variable bioavailabilities of soy isoflavones, which may affect evaluations of soy isoflavone intake in health and disease. Further studies on the development of valid exposure biomarkers are needed to thoroughly investigate the health effects of isoflavone.
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Affiliation(s)
- Hwan-Hee Jang
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03765, Korea
| | - Young-Min Lee
- Division of Applied Food System, Major of Food and Nutrition, Seoul Women's University, Seoul 01797, Korea
| | - Jeong-Sook Choe
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
| | - Oran Kwon
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul 03765, Korea
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5
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Jang HH, Noh H, Kim HW, Cho SY, Kim HJ, Lee SH, Lee SH, Gunter MJ, Ferrari P, Scalbert A, Freisling H, Kim JB, Choe JS, Kwon O. Metabolic tracking of isoflavones in soybean products and biosamples from healthy adults after fermented soybean consumption. Food Chem 2020; 330:127317. [PMID: 32569934 DOI: 10.1016/j.foodchem.2020.127317] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 05/27/2020] [Accepted: 06/09/2020] [Indexed: 12/18/2022]
Abstract
Fermentation may enhance the nutritional properties of foods by increasing metabolite bioactivity or bioavailability. This study explored the effect of fermentation on isoflavone bioavailability and metabolism. Isoflavone metabolites were tracked in foods and biospecimens of healthy adults after fermented soybean (FS) or non-fermented soybean (NFS) consumption in a randomized, controlled, crossover intervention study. The change in soybean isoflavones caused by fermentation resulted in faster absorption and higher bioavailability after consumption of FS. Although the urinary level of total isoflavone metabolites was similar after the consumption of the two diets, urinary genistein 7-O-sulfate was derived as a discriminant metabolite for the FS diet by partial least squares discriminant analysis. This study suggests that an isoflavone conjugate profile might be a more appropriate marker than total isoflavone levels for discriminating between the consumption of FS and NFS diets.
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Affiliation(s)
- Hwan-Hee Jang
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea; Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, South Korea
| | - Hwayoung Noh
- Section of Nutrition and Metabolism, International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - Heon-Woong Kim
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Su-Yeon Cho
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Hyeon-Jeong Kim
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Seon-Hye Lee
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Sung-Hyen Lee
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Marc J Gunter
- Section of Nutrition and Metabolism, International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - Pietro Ferrari
- Section of Nutrition and Metabolism, International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - Augustin Scalbert
- Section of Nutrition and Metabolism, International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - Heinz Freisling
- Section of Nutrition and Metabolism, International Agency for Research on Cancer (IARC-WHO), Lyon, France
| | - Jung-Bong Kim
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea
| | - Jeong-Sook Choe
- National Institute of Agricultural Sciences, Rural Development Administration, Wanju, South Korea.
| | - Oran Kwon
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, South Korea.
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Hati S, Ningtyas DW, Khanuja JK, Prakash S. β-Glucosidase from almonds and yoghurt cultures in the biotransformation of isoflavones in soy milk. FOOD BIOSCI 2020. [DOI: 10.1016/j.fbio.2020.100542] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Lee PG, Lee UJ, Song H, Choi KY, Kim BG. Recent advances in the microbial hydroxylation and reduction of soy isoflavones. FEMS Microbiol Lett 2018; 365:5089968. [PMID: 30184116 DOI: 10.1093/femsle/fny195] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 08/31/2018] [Indexed: 12/17/2023] Open
Abstract
Soy isoflavones are naturally occurring phytochemicals, which are biotransformed into functional derivatives through oxidative and reductive metabolic pathways of diverse microorganisms. Such representative derivatives, ortho-dihydroxyisoflavones (ODIs) and equols, have attracted great attention for their versatile health benefits since they were found from soybean fermented foods and human intestinal fluids. Recently, scientists in food technology, nutrition and microbiology began to understand their correct biosynthetic pathways and nutraceutical values, and have attempted to produce the valuable bioactive compounds using microbial fermentation and whole-cell/enzyme-based biotransformation. Furthermore, artificial design of microbial catalysts and/or protein engineering of oxidoreductases were also conducted to enhance production efficiency and regioselectivity of products. This minireview summarizes and introduces the past year's studies and recent advances in notable production of ODIs and equols, and provides information on available microbial species and their catalytic performance with perspectives on industrial application.
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Affiliation(s)
- Pyung-Gang Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Uk-Jae Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Hanbit Song
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
| | - Kwon-Young Choi
- Department of Environmental Engineering, College of Engineering, Ajou University, Suwon 16499, Republic of Korea
| | - Byung-Gee Kim
- School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul 08826, Republic of Korea
- Bioengineering Institute, Seoul National University, Seoul 08826, South Korea
- Institute of Bioengineering Research, Seoul National University, Seoul 08826, Republic of Korea
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Feizollahzadeh S, Ghiasvand R, Rezaei A, Khanahmad H, Sadeghi A, Hariri M. Effect of Probiotic Soy Milk on Serum Levels of Adiponectin, Inflammatory Mediators, Lipid Profile, and Fasting Blood Glucose Among Patients with Type II Diabetes Mellitus. Probiotics Antimicrob Proteins 2018; 9:41-47. [PMID: 27757829 DOI: 10.1007/s12602-016-9233-y] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Probiotic therapies are going to be an effective alternative therapeutic strategy in the treatment and management of diabetes. The mechanism behind the essential effects of probiotic therapies in diabetic patients was not fully understood. The objective of this study was to evaluate the effects of probiotic soy milk containing Lactobacillus planetarum A7 on inflammation, lipid profile, fasting blood glucose, and serum adiponectin among patients with type 2 diabetes mellitus. Forty patients with type 2 diabetes, at the age of 35-68 years old, were assigned to two groups in this randomized, double-blind, controlled clinical trial. The patients in the intervention group consumed 200 ml/day of probiotic soy milk containing L. planetarum A7 and those in control group consumed 200 ml/day of pure soy milk for 8 weeks. Serum TNF-α, C reactive protein, adiponectin, lipid profile, and fasting blood glucose were determined before and after intervention. In intervention group, serum adiponectin in pre- and post-treatment did not show any significant changes (2.52 ± 0.74 vs 2.84 ± 0.61, P = 0.658), as well as changes in serum TNF-α and C reactive protein (172.44 ± 5.7 vs 172.83 ± 7.6, P = 0.278, 4.2 ± 1.4 vs 4.5 ± 1.9, P = 0.765, respectively). Low-density cholesterol and high-density cholesterol changed significantly (P = 0.023, P = 0.017, respectively), but fasting blood glucose did not show any significant changes. The results of this study showed that consumption of probiotic soy milk and soy milk has no effect on serum adiponectin and inflammation, but it can change lipid profile among type 2 diabetic patients.
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Affiliation(s)
- Sadegh Feizollahzadeh
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Reza Ghiasvand
- Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Abbas Rezaei
- Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hossein Khanahmad
- Department of Molecular Biology and Genetics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Akram Sadeghi
- Department of Anatomical Sciences and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Mitra Hariri
- Department of Basic Medical Sciences, Neyshabur University of Medical Sciences, Neyshabur, Iran.
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Nagino T, Kaga C, Kano M, Masuoka N, Anbe M, Moriyama K, Maruyama K, Nakamura S, Shida K, Miyazaki K. Effects of fermented soymilk with Lactobacillus casei Shirota on skin condition and the gut microbiota: a randomised clinical pilot trial. Benef Microbes 2018; 9:209-218. [DOI: 10.3920/bm2017.0091] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Several clinical studies have shown that isoflavones and Lactobacillus casei Shirota (LcS) have beneficial effects on skin condition and the gut microbiota, respectively. Thus, we investigated the effects of consecutive intake of fermented soymilk (FSM) with LcS on skin condition and the gut microbiota, as well as isoflavone bioavailability, in a randomised, double-blind, placebo-controlled trial as a pilot study. Sixty healthy premenopausal Japanese women received FSM containing a moderate level of isoflavone aglycones and a probiotic LcS, or soymilk (SM) containing neither of them, twice a day for 8 weeks. Skin condition was assessed by a subjective questionnaire for face and morphological analysis of the stratum corneum on the inner forearm. Faecal microbiota and urinary isoflavone were analysed by 16S rRNA gene amplicon sequencing and high-performance liquid chromatography tandem mass spectrometry, respectively. Both the FSM and SM groups had improved skin condition as assessed from scores of overall satisfaction, dryness, moisture, elasticity, coarseness, pigmentation and/or stratum corneum morphology, as well as significantly increased levels of urinary isoflavones during the intake period compared with the pre-intake period, although there were no significant differences between the two groups. There was a significant positive correlation between urinary isoflavone levels and skin questionnaire scores. In contrast, the relative abundance levels of Lactobacillaceae significantly increased and those of Bifidobacteriaceae tended to increase during the intake period compared with the pre-intake period. For the after-intake period they only decreased significantly in the FSM group. The levels of Enterobacteriaceae and Porphyromonadaceae significantly decreased during the intake period in the FSM group. These findings suggest that daily intake of FSM, as well as SM, provides health benefits that improve skin condition via increased levels of isoflavone absorption in the body, and that only FSM beneficially modifies the gut microbiota in premenopausal healthy women.
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Affiliation(s)
- T. Nagino
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - C. Kaga
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - M. Kano
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - N. Masuoka
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - M. Anbe
- Yakult Honsha Co., Ltd., 1-1-19 Higashi-shinbashi, Minato-ku, Tokyo 105-8660, Japan
| | - K. Moriyama
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - K. Maruyama
- RIKEN Innovation Center, Nakamura Laboratory, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - S. Nakamura
- RIKEN Innovation Center, Nakamura Laboratory, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K. Shida
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
| | - K. Miyazaki
- Yakult Central Institute, 5-11 Izumi, Kunitachi-shi, Tokyo 186-8650, Japan
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Lee D, Kim MJ, Ahn J, Lee SH, Lee H, Kim JH, Park S, Jang Y, Ha T, Jung CH. Nutrikinetics of Isoflavone Metabolites After Fermented Soybean Product (Cheonggukjang) Ingestion in Ovariectomized Mice. Mol Nutr Food Res 2017; 61:1700322. [PMID: 28981201 PMCID: PMC6139428 DOI: 10.1002/mnfr.201700322] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 08/28/2017] [Indexed: 12/31/2022]
Abstract
SCOPE Cheonggukjang (CGJ) is a soybean-based quick-fermented food popular in Korea that contains a variety of biologically active compounds including isoflavones and saponins. Isoflavone bioavailability may be important for the bone health of postmenopausal women; therefore, the aim of this study is to evaluate the influence of fermentation on the isoflavone metabolite nutrikinetic profile after single dose CGJ or unfermented soybean administration in ovariectomized (OVX) and sham mice. METHODS AND RESULTS We identify 34 isoflavone metabolites using UPLC-QTOF-MS and analyze their nutrikinetics at different time points (0.25, 0.5, 1, 2, 4, 8, 16, and 24 h) to understand their fermentation- and OVX-mediated time-dependent concentration changes. Nutrikinetics analysis shows that genistein, daidzein, genistein 4'-sulfate, dihydrodaidzein sulfate, equol 4'-sulfate, and equol-7-glucuronide are present at high concentrations in all groups based on area-under-the-curve analysis. OVX mice appear to show lower isoflavone bioavailability than mice in the sham group. CGJ enhances various isoflavone metabolite bioavailability including genistein, 3-hydroxygenistein, and equol 7-glucuronide, compared to the unfermented soybean-treated group. Among these metabolites, intact isoflavones, 3-hydroxygenistein, genistein 4'-sulfate, and equol 7-glucuronide promote osteoblastogenesis and inhibit osteoclast formation. CONCLUSIONS CGJ has good isoflavone bioavailability and may be beneficial for the bone health of postmenopausal women.
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Affiliation(s)
- Da‐Hye Lee
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
- Department of Food BiotechnologyKorea University of Science and TechnologySeongnamRepublic of Korea
| | - Min Jung Kim
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
| | - Jiyun Ahn
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
- Department of Food BiotechnologyKorea University of Science and TechnologySeongnamRepublic of Korea
| | - Sang Hee Lee
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
| | - Hyunjung Lee
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
| | - Jin Hee Kim
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
| | - So‐Hyun Park
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
- Department of Food BiotechnologyKorea University of Science and TechnologySeongnamRepublic of Korea
| | - Young‐Jin Jang
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
| | - Tae‐Youl Ha
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
- Department of Food BiotechnologyKorea University of Science and TechnologySeongnamRepublic of Korea
| | - Chang Hwa Jung
- Research Group of Metabolic MechanismKorea Food Research InstituteSeongnamRepublic of Korea
- Department of Food BiotechnologyKorea University of Science and TechnologySeongnamRepublic of Korea
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11
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Katsuyama M, Demura M, Katsuyama H, Tanii H, Saijoh K. Genistein and menaquinone-4 treatment-induced alterations in the expression of mRNAs and their products are beneficial to osteoblastic MC3T3-E1 cell functions. Mol Med Rep 2017; 16:873-880. [DOI: 10.3892/mmr.2017.6632] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 03/21/2017] [Indexed: 11/06/2022] Open
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12
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Tsuda H, Shibata E. Bioconversion of Daidzin to Daidzein by Lactic Acid Bacteria in Fermented Soymilk. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2017. [DOI: 10.3136/fstr.23.157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Harutoshi Tsuda
- Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima
| | - Eri Shibata
- Faculty of Life and Environmental Sciences, Prefectural University of Hiroshima
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Awasthi S, Wilken R, Patel F, German JB, Mills DA, Lebrilla CB, Kim K, Freeman SL, Smilowitz JT, Armstrong AW, Maverakis E. Dietary supplementation with Bifidobacterium longum subsp. infantis (B. infantis) in healthy breastfed infants: study protocol for a randomised controlled trial. Trials 2016; 17:340. [PMID: 27449926 PMCID: PMC4957407 DOI: 10.1186/s13063-016-1467-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Accepted: 07/02/2016] [Indexed: 12/16/2022] Open
Abstract
Background The development of probiotics as therapies to cure or prevent disease lags far behind that of other investigational medications. Rigorously designed phase I clinical trials are nearly non-existent in the field of probiotic research, which is a contributing factor to this disparity. As a consequence, how to appropriately dose probiotics to study their efficacy is unknown. Herein we propose a novel phase I ascending dose trial of Bifidobacterium longum subsp. infantis (B. infantis) to identify the dose required to produce predominant gut colonisation in healthy breastfed infants at 6 weeks of age. Methods/design This is a parallel-group, placebo-controlled, randomised, double-blind ascending dose phase I clinical trial of dietary supplementation with B. infantis in healthy breastfed infants. The objective is to determine the pharmacologically effective dose (ED) of B. infantis required to produce predominant (>50 %) gut colonisation in breastfed infants at 6 weeks of age. Successively enrolled infant groups will be randomised to receive two doses of either B. infantis or placebo on days 7 and 14 of life. Stool samples will be used to characterise the gut microbiota at increasing doses of B. infantis. Discussion Probiotic supplementation has shown promising results for the treatment of a variety of ailments, but evidence-based dosing regimes are currently lacking. The ultimate goal of this trial is to establish a recommended starting dose of B. infantis for further efficacy-testing phase II trials designed to evaluate B. infantis for the prevention of atopic dermatitis and food allergies in at-risk children. Trial registration Clinicaltrials.gov #NCT02286999, date of trial registration 23 October 2014.
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Affiliation(s)
- Smita Awasthi
- Department of Dermatology, University of California Davis Medical Center, Sacramento, CA, USA
| | - Reason Wilken
- Department of Dermatology, University of California Davis Medical Center, Sacramento, CA, USA
| | - Forum Patel
- Department of Dermatology, University of California Davis Medical Center, Sacramento, CA, USA
| | - J Bruce German
- Department of Food Science & Technology, University of California Davis , Davis, CA, USA
| | - David A Mills
- Department of Food Science & Technology, University of California Davis , Davis, CA, USA
| | - Carlito B Lebrilla
- Department of Chemistry, University of California Davis , Davis, CA, USA
| | - Kyoungmi Kim
- Division of Biostatistics, Department of Public Health Sciences, University of California Davis , Davis, CA, USA
| | - Samara L Freeman
- Foods for Health Institute, University of California Davis , Davis, CA, USA
| | | | - April W Armstrong
- Department of Dermatology, Keck School of Medicine at the University of Southern California, Los Angeles, CA, USA
| | - Emanual Maverakis
- Department of Dermatology, University of California Davis Medical Center, Sacramento, CA, USA.
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Effect of simultaneous consumption of soymilk and coffee on the urinary excretion of isoflavones, chlorogenic acids and metabolites in healthy adults. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.09.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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15
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Homayouni A, Norouzi S. Evaluation of Physicochemical Traits, Sensory Properties and Survival of Lactobacillus casei
in Fermented Soy-Based Ice Cream. J FOOD PROCESS PRES 2015. [DOI: 10.1111/jfpp.12648] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aziz Homayouni
- Department of Food Science and Technology; Faculty of Nutrition; Tabriz University of Medical Sciences; Tabriz 5166614711 Iran
| | - Sharareh Norouzi
- Department of Food Science and Technology; Faculty of Nutrition; Tabriz University of Medical Sciences; Tabriz 5166614711 Iran
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Hariri M, Salehi R, Feizi A, Mirlohi M, Ghiasvand R, Habibi N. A randomized, double-blind, placebo-controlled, clinical trial on probiotic soy milk and soy milk: effects on epigenetics and oxidative stress in patients with type II diabetes. GENES AND NUTRITION 2015; 10:52. [PMID: 26577825 DOI: 10.1007/s12263-015-0503-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/08/2015] [Indexed: 01/07/2023]
Abstract
This clinical trial aimed to discover the effects of probiotic soy milk and soy milk on MLH1 and MSH2 promoter methylation, and oxidative stress among type II diabetic patients. Forty patients with type II diabetes mellitus aged 35-68 years were assigned to two groups in this randomized, double-blind, controlled clinical trial. Patients in the intervention group consumed 200 ml/day of probiotic soy milk containing Lactobacillus plantarum A7, while those in the control group consumed 200 ml/d of conventional soy milk for 8 weeks. Fasting blood samples, anthropometric measurements, and 24-h dietary recalls were collected at the baseline and at the end of the study, respectively. Probiotic soy milk significantly decreased promoter methylation in proximal and distal MLH1 promoter region (P < 0.01 and P < 0.0001, respectively) compared with the baseline values, while plasma concentration of 8-hydroxy-2'-deoxyguanosine (8-OHdG) decreased significantly compared with soy milk (P < 0.05). In addition, a significant increase in superoxide dismutase (SOD) activity was observed in probiotic soy milk group compared with baseline value (P < 0.01). There were no significant changes from baseline in the promoter methylation of MSH2 within either group (P > 0.05). The consumption of probiotic soy milk improved antioxidant status in type II diabetic patients and may decrease promoter methylation among these patients, indicating that probiotic soy milk is a promising agent for diabetes management.
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Affiliation(s)
- Mitra Hariri
- Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran.
- Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Rasoul Salehi
- Pediatrics Inherited Diseases Research Center, Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Awat Feizi
- Department of Biostatistics and Epidemiology, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Maryam Mirlohi
- Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran
- Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Reza Ghiasvand
- Department of Community Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan, Iran.
- Food Security Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Nahal Habibi
- Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia
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Timan P, Rojanasthien N, Manorot M, Sangdee C, Teekachunhatean S. Effect of synbiotic fermented milk on oral bioavailability of isoflavones in postmenopausal women. Int J Food Sci Nutr 2014; 65:761-7. [PMID: 24720601 DOI: 10.3109/09637486.2014.908169] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The purpose of this study was to investigate the effect of synbiotic fermented milk, containing Lactobacillus paracasei and inulin, on oral bioavailability and pharmacokinetics of isoflavones in healthy postmenopausal women. The study was a one-group pre-post treatment study. Twelve subjects were assigned to consume a single oral dose of 375 mL of soy beverage. Blood samples were collected immediately before and at various time points until 32 hours after the administration of the soy beverage. After a washout period, subjects were requested to consume 180 mL of synbiotic fermented milk after breakfast and dinner for 14 days, followed by a single oral dose of 375 mL of soy beverage on the next day. Collection of blood samples after the administration of the soy beverage were performed at the same time points as the former phase. Plasma isoflavone concentrations were measured by using high-performance liquid chromatography (HPLC) technique. In conclusion, this study highlighted that continuous consumption of synbiotic fermented milk followed by a single oral administration of soy beverage significantly enhanced oral bioavailability of isoflavones compared with a single oral dose of soy beverage alone.
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Affiliation(s)
- Porntip Timan
- Department of Pharmacology, Faculty of Medicine, Chiang Mai University , Chiang Mai , Thailand and
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Peluso I, Romanelli L, Palmery M. Interactions between prebiotics, probiotics, polyunsaturated fatty acids and polyphenols: diet or supplementation for metabolic syndrome prevention? Int J Food Sci Nutr 2014; 65:259-67. [PMID: 24467635 DOI: 10.3109/09637486.2014.880670] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The metabolic syndrome can be prevented by the Mediterranean diet, characterized by fiber, omega-3 polyunsaturated fatty acids and polyphenols. However, the composition of the Mediterranean diet, which can be viewed as a natural multiple supplement, is poorly controlled, and its beneficial effects poorly predictable. The metabolic syndrome is associated with intestinal dysbiosis and the gut microbioma seems to be the main target and player in the interactions occurring between probiotics, prebiotics, omega 3 polyunsaturated fatty acids, and polyphenols. From the reviewed evidence, it is reasonable to manage growth and metabolism of gut microflora with specific prebiotics and polyphenols. Even though the healthy properties of functional foods and nutraceuticals still need to be fully elucidated, available data suggest that well-designed supplements, containing the better ratio of omega-3 polyunsaturated fatty acids and antioxidants, specific probiotic strains, and selected polyphenols and prebiotics, could be useful in metabolic syndrome prevention and treatment.
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Affiliation(s)
- Ilaria Peluso
- Department of Physiology and Pharmacology "V. Erspamer", "Sapienza" University of Rome , Rome , Italy
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Rossi M, Amaretti A, Leonardi A, Raimondi S, Simone M, Quartieri A. Potential impact of probiotic consumption on the bioactivity of dietary phytochemicals. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:9551-9558. [PMID: 24007212 DOI: 10.1021/jf402722m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Many healthy phytochemicals occur in food in the form of esters, glycoconjugates, or polymers, which are not directly bioavailable. Probiotic lactobacilli and bifidobacteria, which have evolved within the colonic ecosystem where indigestible oligo- and polysaccharides are their sole carbon sources, bear several glycosyl-hydrolases and can contribute to release the aglycones from glycoconjugated phytochemicals. Among the glycosyl-hydrolases, β-glucosidases are the most pertinent, because many phytochemicals are glucoconjugates. β-Glucosidase-positive probiotic bacteria were proved to release the aglycones of isoflavones and lignans in vitro, but studies in vivo are scarce. A positive correlation between probiotic consumption and urinary and/or plasma levels of isoflavone or lignan metabolites was not established. However, the strains used in the trials were not validated for the enzymatic properties or for the ability to hydrolyze lignans or isoflavones. Thus, activation of specific phytochemicals by probiotic bacteria still needs substantial efforts to be proved.
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Affiliation(s)
- Maddalena Rossi
- Department of Life Sciences, University of Modena and Reggio Emilia , 41125 Modena, Italy
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Haron H, Ismail A, Shahar S, Azlan A, Peng LS. Apparent bioavailability of isoflavones in urinary excretions of postmenopausal Malay women consuming tempeh compared with milk. Int J Food Sci Nutr 2011; 62:642-50. [PMID: 21574819 DOI: 10.3109/09637486.2011.570742] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Quantitation of isoflavones in humans is important to establish the benefits of these compounds to the populations. Urinary isoflavones are frequently used as a biomarker of isoflavone bioavailability from food or supplement since urine contains 100-fold higher concentrations of isoflavones. The objective of the present study was to determine and compare the urinary excretions of daidzein (DA), genistein (GE) and equol (EQ) in postmenopausal Malay women following the consumption of tempeh and milk in a calcium absorption study and to test the hypothesis that the excretion of isoflavones following consumption of tempeh maybe higher compared with milk. The amounts of DA (47.06 ± 4.18 μmol/h), GE (33.27 ± 3.71 μmol/h) and EQ (24.35 ± 4.34 μmol/h) excreted in urine following tempeh consumption were significantly higher (P < 0.05) compared with those in milk (3.51 ± 0.62 μmol/h DA, 2.79 ± 0.35 μmol/h GE and 0 μmol/h EQ). Almost all studied postmenopausal Malay women were able to excrete EQ following consumption of 240 g tempeh but only one subject can be classified as an equol producer. We concluded that most postmenopausal Malay women excreted DA, GE and EQ in their urine following tempeh consumption and the amount of the excreted isoflavones were higher compared with those in milk. However, further studies are needed to determine whether longer periods of time are required to capture EQ producers.
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Affiliation(s)
- Hasnah Haron
- Department of Nutrition & Dietetics, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia.
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Okabe Y, Shimazu T, Tanimoto H. Higher bioavailability of isoflavones after a single ingestion of aglycone-rich fermented soybeans compared with glucoside-rich non-fermented soybeans in Japanese postmenopausal women. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:658-63. [PMID: 21104834 DOI: 10.1002/jsfa.4228] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 10/13/2010] [Accepted: 10/15/2010] [Indexed: 05/30/2023]
Abstract
BACKGROUND There have been conflicting study results concerning how the food matrix affects the bioavailability of isoflavone aglycone and glucoside. In this study the bioavailability of isoflavones after a single ingestion of aglycone-rich fermented soybeans (Fsoy) and glucoside-rich non-fermented soybeans (Soy) was compared. Eleven healthy postmenopausal Japanese women were recruited for a randomised, double-blind, crossover trial and consumed Fsoy or Soy powder dissolved in hot water. Blood samples were collected 0, 1, 2, 3, 4, 6, 8, 12 and 24 h and urine samples from 0 to 48 h after ingestion of the powders. The Fsoy and Soy powders ingested had the same total isoflavone content (95 µmol), but the former was rich in aglycone (90.6 µmol) while the latter was rich in glucoside (81.9 µmol). RESULTS Serum concentrations of total isoflavones after 1-4 h were significantly higher in the Fsoy group than in the Soy group. The Fsoy group showed significantly higher maximum concentration (Cmax: 2.79 ± 0.13 vs 1.74 ± 0.13 µmol L(-1) ) and area under the curve (AUC(0-24 h) : 23.78 ± 2.41 vs 19.95 ± 2.03 µmol day L(-1) ) and lower maximum concentration time (Tmax: 1.00 ± 0.00 vs 5.00 ± 0.67 h) compared with the Soy group. The cumulative urinary excretion of total isoflavones after 2 h was significantly higher in the Fsoy group than in the Soy group. Individual isoflavones (daidzein, genistein and glycitein) showed similar trends to total isoflavones. Equol (a metabolite from daidzein) did not differ between the two groups. CONCLUSION The results of this study demonstrated that the isoflavones of aglycone-rich Fsoy were absorbed faster and in greater amounts than those of glucoside-rich Soy in postmenopausal Japanese women.
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Affiliation(s)
- Yuki Okabe
- Research Institute for Health Fundamentals, Ajinomoto Co., Inc., 1-1, Suzuki-cho, Kawasaki 210-8681, Japan.
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Gobbetti M, Cagno RD, De Angelis M. Functional microorganisms for functional food quality. Crit Rev Food Sci Nutr 2010; 50:716-27. [PMID: 20830633 DOI: 10.1080/10408398.2010.499770] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Functional microorganisms and health benefits represent a binomial with great potential for fermented functional foods. The health benefits of fermented functional foods are expressed either directly through the interactions of ingested live microorganisms with the host (probiotic effect) or indirectly as the result of the ingestion of microbial metabolites synthesized during fermentation (biogenic effect). Since the importance of high viability for probiotic effect, two major options are currently pursued for improving it--to enhance bacterial stress response and to use alternative products for incorporating probiotics (e.g., ice cream, cheeses, cereals, fruit juices, vegetables, and soy beans). Further, it seems that quorum sensing signal molecules released by probiotics may interact with human epithelial cells from intestine thus modulating several physiological functions. Under optimal processing conditions, functional microorganisms contribute to food functionality through their enzyme portfolio and the release of metabolites. Overproduction of free amino acids and vitamins are two classical examples. Besides, bioactive compounds (e.g., peptides, γ-amino butyric acid, and conjugated linoleic acid) may be released during food processing above the physiological threshold and they may exert various in vivo health benefits. Functional microorganisms are even more used in novel strategies for decreasing phenomenon of food intolerance (e.g., gluten intolerance) and allergy. By a critical approach, this review will aim at showing the potential of functional microorganisms for the quality of functional foods.
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Affiliation(s)
- M Gobbetti
- Dipartimento di Biologia e Chimica Agro-Forestale e Ambientale, University of Bari, Italy.
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Bolca S, Li J, Nikolic D, Roche N, Blondeel P, Possemiers S, De Keukeleire D, Bracke M, Heyerick A, van Breemen RB, Depypere H. Disposition of hop prenylflavonoids in human breast tissue. Mol Nutr Food Res 2010; 54 Suppl 2:S284-94. [PMID: 20486208 DOI: 10.1002/mnfr.200900519] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hop-derived products may contain xanthohumol (XN), isoxanthohumol (IX), and the potent phytoestrogen 8-prenylnaringenin (8-PN). To evaluate the potential health effects of these prenylflavonoids on breast tissue, their concentration, nature of metabolites, and biodistribution were assessed and compared with 17beta-estradiol (E(2)) exposure. In this dietary intervention study, women were randomly allocated to hop (n=11; 2.04 mg XN, 1.20 mg IX, and 0.1 mg 8-PN per supplement) or control (n=10). After a run-in of >or=4 days, three supplements were taken daily for 5 days preceding an aesthetic breast reduction. Blood and breast biopsies were analyzed using HPLC-ESI-MS/MS. Upon hop administration, XN and IX concentrations ranged between 0.72 and 17.65 nmol/L and 3.30 and 31.50 nmol/L, and between 0.26 and 5.14 pmol/g and 1.16 and 83.67 pmol/g in hydrolyzed serum and breast tissue, respectively. 8-PN however, was only detected in samples of moderate and strong 8-PN producers (0.43-7.06 nmol/L and 0.78-4.83 pmol/g). Phase I metabolism appeared to be minor (approximately 10%), whereas extensive glucuronidation was observed (> 90%). Total prenylflavonoids showed a breast adipose/glandular tissue distribution of 38/62 and their derived E(2)-equivalents were negligible compared with E(2) in adipose (384.6+/-118.8 fmol/g, p=0.009) and glandular (241.6+/-93.1 fmol/g, p<0.001) tissue, respectively. Consequently, low doses of prenylflavonoids are unlikely to elicit estrogenic responses in breast tissue.
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Affiliation(s)
- Selin Bolca
- Laboratory of Microbial Ecology and Technology (LabMET), Faculty of Bioscience Engineering, Ghent University-UGent, Belgium
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Pérez-Jiménez J, Hubert J, Hooper L, Cassidy A, Manach C, Williamson G, Scalbert A. Urinary metabolites as biomarkers of polyphenol intake in humans: a systematic review. Am J Clin Nutr 2010; 92:801-9. [PMID: 20810980 DOI: 10.3945/ajcn.2010.29924] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND To identify associations between polyphenol intake and health and disease outcomes in cohort studies, it is important to identify biomarkers of intake for the various compounds commonly consumed as part of the diet. OBJECTIVE The objective of this systematic review was to assess the usefulness of polyphenol metabolites excreted in urine as biomarkers of polyphenol intake in humans. DESIGN The method included a structured search strategy for polyphenol intervention studies on Ovid MEDLINE, EMBASE (Ovid), and Cochrane databases; formal inclusion and exclusion criteria; data extraction into an Access database; validity assessment; and meta-analysis. RESULTS One hundred sixty-two controlled intervention studies with polyphenols were included, and mean recovery yield and correlations with the dose ingested were determined for 40 polyphenols. Polyphenols such as daidzein, genistein, glycitein, enterolactone, and hydroxytyrosol showed both a high recovery yield (12-37%) and a high correlation with the dose (Pearson's correlation coefficients: 0.67-0.87), which showed good sensitivity and robustness as biomarkers of intake throughout the different studies. Weaker recovery for anthocyanins (0.06-0.2%) and weaker correlations with dose [Pearson's correlation coefficients: 0.21-0.52 for hesperidin, naringenin, (-)-epicatechin, (-)-epigallocatechin, quercetin, and 3 microbial metabolites of isoflavones (dihydrodaidzein, equol, and O-desmethylangolensin)] suggest that they are currently less suitable as biomarkers of intake. CONCLUSIONS These data confirm the value of certain urinary polyphenols as biomarkers of intake. A validation in populations is now needed to evaluate their specificity, sensitivity, and responsiveness to dose under free-living conditions.
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Affiliation(s)
- Jara Pérez-Jiménez
- Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, Clermont-Ferrand, France
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Rabot S, Rafter J, Rijkers GT, Watzl B, Antoine JM. Guidance for substantiating the evidence for beneficial effects of probiotics: impact of probiotics on digestive system metabolism. J Nutr 2010; 140:677S-89S. [PMID: 20107147 DOI: 10.3945/jn.109.113738] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Probiotic bacteria have been studied for their potential impact on the metabolism of dietary components in the small intestine lumen including lactose digestion, metabolism of lipids such as cholesterol, and oxalate metabolism. In the large intestine, they contribute to the metabolism of otherwise indigestible dietary carbohydrates (e.g., prebiotics) and have a favorable effect on colonic protein and ammonia metabolism, although their effect on the digestive fate of phytochemicals and xenobiotics is still uncertain. Probiotics also influence metabolism in the host tissues, in particular the gastrointestinal mucosa and the liver. Underlying mechanisms include supply of additional enzymatic activities in the gut lumen and alterations of the composition or metabolic pattern of the gut resident microbiota. For future studies, selection of probiotic strains should include assessment of their metabolic activities, and the outcome of the intervention studies should also take into account the composition of the probiotic matrix and the background diet of the target population. New technologies such as metabolomics hold great promise for assessment of probiotics functionality.
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Affiliation(s)
- Sylvie Rabot
- INRA, UR 910 Ecology and Physiology of the Digestive Tract, F-78350 Jouy-en-Josas, France
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Woo Y, Fung W, Easa A, Liong M. Probiotic-fermented soyfoods: Benefits and enhanced bioactivities. ACTA ALIMENTARIA 2009. [DOI: 10.1556/aalim.2009.0003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Abstract
Isoflavone (IFL) intake may provide numerous health benefits, but IFL bioavailability differences among soya foods remains uncertain. Urinary IFL excretion (UIE) was shown to provide a reliable surrogate for systemic IFL exposure and therefore can be used as a measure of 'apparent bioavailability' (AB). We investigated the AB of IFL in fourteen healthy adults, consuming two liquid and two solid soya foods in a crossover designed study. Volunteers consumed the foods with a self-selected breakfast, which was kept identical for all four soya items (soya nuts, soya milk, soya protein bar and soya protein powder drink in water; average 23.7 mg IFL, 88-96 % glycosides, by HPLC analysis) and collected all urine up to 26 h. Liquid foods showed initially higher UIE values than solid foods, but this difference was considerably reduced or disappeared entirely after 24-26 h. Conclusive AB results were obtained only after 24-26 h; earlier collections were not reliable. At 26 h, adjusted UIE values for daidzein (DE) were 20 micromol in the milk and bar and 17 micromol for the nut and powder; urinary genistein excretion was the highest in the milk group (10 micromol) followed by the nut, bar (both 6 micromol) and powder groups (5 micromol); the UIE for glycitein was the highest for bars (4 micromol), followed by powder and nuts (3 micromol), and milk (2 micromol). DE makes the largest contribution to urinary total IFL. The AB of IFL was found to be variable depending on the analyte and soya food consumed.
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Raimondi S, Roncaglia L, De Lucia M, Amaretti A, Leonardi A, Pagnoni UM, Rossi M. Bioconversion of soy isoflavones daidzin and daidzein by Bifidobacterium strains. Appl Microbiol Biotechnol 2009; 81:943-50. [PMID: 18820905 DOI: 10.1007/s00253-008-1719-4] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 09/09/2008] [Accepted: 09/09/2008] [Indexed: 12/17/2022]
Abstract
Twenty-two strains of Bifidobacterium, representative of eight major species of human origin, were screened for their ability to transform the isoflavones daidzin and daidzein. Most of the strains released the aglycone from daidzin and 12 gave yields higher than 90%. The kinetics of growth, daidzin consumption, and daidzein production indicated that the hydrolytic activity occurred during the growth. The supernatant of the majority of the strains did not release the aglycone from daidzin, suggesting that cell-associated beta-glucosidases (beta-Glu) are mainly responsible for the metabolism of soybean glyco-conjugates. Cell-associated beta-Glu was mainly intracellular and significantly varied among the species and the strains. The lack of beta-Glu was correlated with the inability to hydrolyze daidzin. Although S-equol production by anaerobic intestinal bacteria has been established, information on S-equol-producing bifidobacteria is contradictory. In this study, 22 bifidobacteria failed to transform daidzein into reduced metabolites under all the experimental conditions, excluding any role in the reductive pathway of daidzein toward the production of S-equol. These results suggest that selected probiotic strains of Bifidobacterium can be used to speed up the release of daidzein, improving its bioavailability for absorption by colonic mucosa and/or biotransformation to S-equol by other intestinal microorganisms.
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Affiliation(s)
- Stefano Raimondi
- Department of Chemistry, University of Modena and Reggio Emilia, Via Campi 183, 41100 Modena, Italy
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Franke AA, Halm BM, Kakazu K, Li X, Custer LJ. Phytoestrogenic isoflavonoids in epidemiologic and clinical research. Drug Test Anal 2009; 1:14-21. [PMID: 20355154 PMCID: PMC4439247 DOI: 10.1002/dta.12] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Isoflavones (IFLs) are natural products to which humans have been traditionally exposed predominantly through soy foods; more recently humans are also exposed to them through soy protein addition to processed foods or through supplements. They are structurally similar to steroidal estrogens and can exert estrogenic or antiestrogenic effects depending on their concentrations and on the tissue considered. These properties qualify IFLs to be classified as phytoestrogens and are believed to account for many of the biological effects observed for soy and/or IFL exposure including benefits for bone and heart health or prevention of menopausal symptoms and certain types of cancer. In order to evaluate the function of IFLs, alone or when exposure happens through soy intake, pharmacokinetics and bioavailability are critical issues to be considered in epidemiologic and clinical research. For this purpose precise, accurate, robust, fast, and affordable techniques for IFL analyses are required.
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Affiliation(s)
- Adrian A Franke
- Cancer Research Center of Hawai'i, Natural Products and Cancer Biology Program, Honolulu, HI 96813, USA.
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Vatanparast H, Chilibeck PD. Does the Effect of Soy Phytoestrogens on Bone in Postmenopausal Women Depend on the Equol-Producing Phenotype? Nutr Rev 2008. [DOI: 10.1111/j.1753-4887.2007.tb00307.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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Urinary isoflavonoid excretion is similar after consuming soya milk and miso soup in Japanese-American women. Br J Nutr 2008; 100:424-9. [PMID: 18275624 DOI: 10.1017/s0007114508898686] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Based on the hypothesis that isoflavones are absorbed more efficiently from fermented than from non-fermented soya foods, we compared the urinary isoflavonoid excretion (UIE) after intake of miso soup or soya milk. We recruited twenty-one women with Japanese ancestry who consumed standardized soya portions containing 48 mg isoflavones. On day 1, half the women consumed soya milk, the other half started with miso soup. On day 3, the subjects ate the other soya food and on day 5, they repeated the first food. Each participant collected a spot urine sample before and an overnight urine sample after soya food intake. All urine samples were analysed for daidzein, genistein and equol using LC-MS and were expressed as nmol/mg creatinine. We applied mixed models to evaluate the difference in UIE by food while including the baseline values and covariates. Relative to baseline, both groups experienced significantly higher UIE after consuming any of the soya foods. We observed no significant difference in UIE when soya milk was compared to miso soup (P = 0.87) among all women or in the seven equol producers (P = 0.88). Repeated intake of the same food on different days showed high reproducibility within subjects. These preliminary results indicate similar UIE after consuming a fermented soya food (miso) as compared to a non-fermented soya food (soya milk). Therefore, recommendations favouring fermented soya foods are not justified as long as the intestinal microflora is capable of hydrolysing the isoflavone glucosides from non-fermented soya foods.
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Song WO, Chun OK, Hwang I, Shin HS, Kim BG, Kim KS, Lee SY, Shin D, Lee SG. Soy isoflavones as safe functional ingredients. J Med Food 2007; 10:571-80. [PMID: 18158825 DOI: 10.1089/jmf.2006.0620] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In recent years, isoflavones have increased in popularity as an alternative to estrogen therapy, particularly after the Women's Health Initiative demonstrated an increased risk of breast cancer, stroke, and heart attacks in response to estrogen and progesterone intervention. Isoflavones are heterocyclic phenols with structural similarity to estradiol-17beta and selective estrogen receptor modulators. Actions at the cellular level depend on the target tissue, receptor status of the tissue, and the level of endogenous estrogen. Clinical studies of soy-based diets evaluating the relation between soy consumption and serum lipid concentrations revealed that soy consumption significantly decreased total cholesterol, low-density lipoprotein cholesterol, and triglyceride levels. Epidemiological studies suggest a protective effect of soy protein on breast tissue as evidenced by the lower rates of breast cancer in East Asian countries where soy is a predominant part of the diet. Soy products also alleviate menopausal symptoms by reducing hot flashes. However, whether these biological effects of soy products originated from isoflavones is not clear. Furthermore, data available from human studies on the effect of isoflavones on osteoporosis are limited, and additional studies are needed to support a role in osteoporosis prevention. To date, no adverse effects of short- or long-term use of soy proteins are known in humans, and the only adverse effects known are those reported in animals. In conclusion, isoflavones are biologically active compounds, and current data are insufficient to draw definitive conclusions regarding the use of isoflavones as an alternative to estrogen for hormone replacement in postmenopausal women. Large, long-term intervention studies examining adverse effects and disease outcomes are needed before definitive conclusion can be drawn.
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Affiliation(s)
- Won O Song
- Department of Food Science and Human Nutrition, Michigan State University, MI 48824, USA.
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Bolca S, Possemiers S, Herregat A, Huybrechts I, Heyerick A, De Vriese S, Verbruggen M, Depypere H, De Keukeleire D, Bracke M, De Henauw S, Verstraete W, Van de Wiele T. Microbial and dietary factors are associated with the equol producer phenotype in healthy postmenopausal women. J Nutr 2007; 137:2242-6. [PMID: 17885005 DOI: 10.1093/jn/137.10.2242] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Equol, a microbial metabolite of daidzein, has been hypothesized as a clue to the effectiveness of soy and its isoflavones but is excreted by only 33% of Caucasians. Microbial and dietary factors associated with the ability to harbor equol-producing bacteria were studied in a randomized dietary intervention trial with 100 healthy postmenopausal women. After a 4-d baseline period, subjects delivered first-void urine, fecal, and breath samples. During the 5-d treatment period, 3 portions of either soymilk or soy germ containing 28.51 and 37.99 mg isoflavone aglycone equivalents/portion, respectively, were administered daily, and on the last day, 24-h urine samples were collected. The urinary recoveries of genistein and daidzein from soymilk were significantly higher than those from soy germ tablets. Because the proportion of equol:(daidzein + metabolites) in the urine did not differ between the treatment groups, subjects were pooled and classified into poor, moderate, and strong equol producers based on this criterion. The strong equol producer phenotype correlated negatively [in vivo, r = -0.478 (-0.256 to -0.893), P = 0.021; in vitro, r = -0.576 (-0.350 to -0.949), P = 0.030] with Clostridium coccoides-Eubacterium rectale counts and positively [in vivo, r = 1.158 (0.971-1.380), P = 0.048; in vitro, r = 1.156 (1.007-1.327), P = 0.039] with the abundance of sulfate-reducing bacteria. Furthermore, persons with a higher PUFA [in vivo, r = 2.150 (1.058-4.371), P = 0.034; in vitro, r = 2.131 (1.144-3.967), P = 0.017] and alcohol [in vivo, r = 1.166 (0.721-1.887), P = 0.050; in vitro, r = 1.850 (1.215-2.817), P = 0.004] intake were more likely to be strong equol producers. Finally, we validated the daidzein metabolism by fecal cultures as screening assay to identify equol producers without dietary intervention.
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Affiliation(s)
- Selin Bolca
- Laboratory of Microbial Ecology and Technology, Faculty of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium
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Abstract
PURPOSE OF REVIEW Modern consumer needs have stimulated a vast expansion in the dietary supplement market, in an attempt to improve general well being and prevent, rather than cure, disease. Isoflavones form a large part of this market. Their oestrogenic properties are still largely unknown and must be thoroughly researched to ensure they cause no adverse effects, particularly on hormone-dependent reproductive physiology. RECENT FINDINGS As a result of the increasing availability of phytoestrogens, research into their actions now covers a very wide field, many of which impact on reproductive potential. Time of exposure is crucial, as is interaction with other dietary components. Their putative role as chemoprotective agents has been expanded in recent years which may have an indirect impact on fertility by decreasing mortality rates in both men and women. SUMMARY Phytoestrogens are still a current research topic in reproduction and fertility. Genistein is a putative therapeutic tool in cancer treatment although this must be considered along with evidence that it may cause DNA damage in sperm, depending on the concentration. The effects of phytoestrogen in the body are not limited to oestrogenic action. Much more epidemiological data are required to interpret current molecular studies, and those of previous years.
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Tsangalis D, Wilcox G, Shah NP, McGill AEJ, Stojanovska L. Urinary excretion of equol by postmenopausal women consuming soymilk fermented by probiotic bifidobacteria. Eur J Clin Nutr 2006; 61:438-41. [PMID: 17021598 DOI: 10.1038/sj.ejcn.1602530] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To study the effects of consuming isoflavone aglycone-enriched soymilk fermented by bifidobacteria on urinary excretion of equol with respect to fermentation, daidzein dose, supplementation duration and background diet. DESIGN Double-blind crossover pilot study comprising three 14-day supplementation periods separated by a washout. SETTING Victoria University, Melbourne, Australia. SUBJECTS Sixteen postmenopausal women. INTERVENTION SUBJECTS randomized into two groups consuming either fermented (FS) or non-fermented soymilk (NFS), ingested three daily dosages of daidzein via soymilk and collected pooled urine specimens. Daidzein and equol were quantified using high-performance liquid chromatography. RESULTS After 14-days supplementation six women (38%) excreted equol (>1 micromol equol/day), including four from the FS group, two of whom were classified as non-producers at day 4. Bifidobacteria ingestion, composition of daidzein and its glucosides, and carbohydrate intake appeared to influence equol formation among equol producers. CONCLUSIONS Pilot-study group mean urinary equol excretion results provided insufficient evidence (P>0.05) that FS consumption instigates equol production in women predetermined as non-producers.
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Affiliation(s)
- D Tsangalis
- Food Safety, Authenticity & Quality Unit, School of Molecular Sciences, Victoria University, Werribee, Victoria, Australia
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Kano M, Takayanagi T, Harada K, Sawada S, Ishikawa F. Bioavailability of isoflavones after ingestion of soy beverages in healthy adults. J Nutr 2006; 136:2291-6. [PMID: 16920843 DOI: 10.1093/jn/136.9.2291] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
It is unknown whether the bioavailability of isoflavones is affected by the concomitant ingestion of glucosides or aglycones. This study was designed to investigate the effects of soymilk-based beverages containing different types of isoflavones on their absorption, excretion, and metabolism. Twelve healthy volunteers consumed 3 kinds of soymilk: untreated soymilk, beta-glucosidase-treated soymilk, and fermented soymilk. Blood samples were collected after 0, 1, 2, 3, 4, 5, 6, 7, 8, and 24 h. Urine samples were collected from 0 to 48 h. Concentrations of isoflavones and daidzein metabolites in serum and urine were measured by liquid chromatography-mass spectrometry. After the ingestion of soymilk, the total concentration of isoflavones in serum rose slowly and reached a maximum of 0.94 +/- 0.39 micromol/L at 6.0 +/- 1.2 h. However, beta-glucosidase-treated soymilk and fermented soymilk increased the serum isoflavone concentration significantly more quickly with maximum concentrations at 1.0 h of 1.75 +/- 0.33 micromol/L and 2.05 +/- 0.32 micromol/L, respectively. The urinary excretion of isoflavones after ingesting of these aglycone-enriched preparations was significantly greater than after consumption of untreated soymilk up to 8 h after injection, but not thereafter. The total and individual concentrations of isoflavones in serum and urine did not differ when subjects consumed the 2 aglycone-enriched soymilks. However, in equol producers (n = 5), the ingestion of ESM tended to increase urinary excretion of equol compared with the consumption of FSM (P = 0.08). These results demonstrated that the isoflavone aglycones of soymilk were absorbed faster and in greater amounts than their glucosides in healthy adults and that the metabolism of isoflavones might be affected by the type of soymilk consumed.
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Affiliation(s)
- Mitsuyoshi Kano
- Yakult Central Institute for Microbiological Research, Kunitachi, Tokyo 186-8650, Japan.
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Mathey J, Lamothe V, Coxam V, Potier M, Sauvant P, Bennetau-Pelissero C. Concentrations of isoflavones in plasma and urine of post-menopausal women chronically ingesting high quantities of soy isoflavones. J Pharm Biomed Anal 2006; 41:957-65. [PMID: 16513315 DOI: 10.1016/j.jpba.2006.01.051] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Revised: 01/23/2006] [Accepted: 01/25/2006] [Indexed: 10/25/2022]
Abstract
Soy food or food supplements based on soy containing isoflavones (Isos) are increasingly available in Western countries. However, the variability of Isos levels in urine and plasma in humans during chronic ingestion is poorly documented. Nevertheless, this is the way these compounds will most probably be used in the future, especially if the soy-based supplements market goes on increasing. Here, glycosilated Isos in an enriched extract of Prevastein equal to 100 mg of equivalent Isos aglycone was given daily to 27 post-menopausal women for 30 days and to 12 post-menopausal women for 60 days. Volunteers were given Prevastein in a cereal bar (25 mg Isos) and in a yoghurt (25 mg Isos) both at breakfast and dinner. Plasma samples were collected after overnight fasting. Urine samples were aliquots of a 24 h collection checked on volume and creatinin excretion levels. Genistein, daidzein and equol were measured at day 0 and every 15 days afterwards, using original specific ELISAs. Constant levels were reached from the 15th day. About 59.2% of the volunteers were significant equol producers in the first experiment and 58.3% in the second. A large variability in plasma and urine levels was observed among post-menopausal women consuming 100 mg Isos per day, although remaining relatively stable in each individual subject. This could partly account for the controversial effects of Isos recorded so far in clinical studies. So Isos plasma levels would have to be assayed during chronic exposures, and could help to better understand the large variability of the effects classically observed in clinical studies. ELISA techniques could be easily exported to analytical laboratories to help physicians and nutritionists with their prescriptions.
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Affiliation(s)
- J Mathey
- Groupe Ostéoporose, U3M, INRA Theix, 63122 Saint Genès-Champanelle, France
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