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Wu G, Bazer FW, Johnson GA, Satterfield MC, Washburn SE. Metabolism and Nutrition of L-Glutamate and L-Glutamine in Ruminants. Animals (Basel) 2024; 14:1788. [PMID: 38929408 PMCID: PMC11201166 DOI: 10.3390/ani14121788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2024] [Revised: 06/02/2024] [Accepted: 06/05/2024] [Indexed: 06/28/2024] Open
Abstract
Although both L-glutamate (Glu) and L-glutamine (Gln) have long been considered nutritionally nonessential in ruminants, these two amino acids have enormous nutritional and physiological importance. Results of recent studies revealed that extracellular Gln is extensively degraded by ruminal microbes, but extracellular Glu undergoes little catabolism by these cells due to the near absence of its uptake. Ruminal bacteria hydrolyze Gln to Glu plus ammonia and, intracellularly, use both amino acids for protein synthesis. Microbial proteins and dietary Glu enter the small intestine in ruminants. Both Glu and Gln are the major metabolic fuels and building blocks of proteins, as well as substrates for the syntheses of glutathione and amino acids (alanine, ornithine, citrulline, arginine, proline, and aspartate) in the intestinal mucosa. In addition, Gln and aspartate are essential for purine and pyrimidine syntheses, whereas arginine and proline are necessary for the production of nitric oxide (a major vasodilator) and collagen (the most abundant protein in the body), respectively. Under normal feeding conditions, all diet- and rumen-derived Glu and Gln are extensively utilized by the small intestine and do not enter the portal circulation. Thus, de novo synthesis (e.g., from branched-chain amino acids and α-ketoglutarate) plays a crucial role in the homeostasis of Glu and Gln in the whole body but may be insufficient for maximal growth performance, production (e.g., lactation and pregnancy), and optimal health (particularly intestinal health) in ruminants. This applies to all types of feeding systems used around the world (e.g., rearing on a milk replacer before weaning, pasture-based production, and total mixed rations). Dietary supplementation with the appropriate doses of Glu or Gln [e.g., 0.5 or 1 g/kg body weight (BW)/day, respectively] can safely improve the digestive, endocrine, and reproduction functions of ruminants to enhance their productivity. Both Glu and Gln are truly functional amino acids in the nutrition of ruminants and hold great promise for improving their health and productivity.
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Affiliation(s)
- Guoyao Wu
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; (F.W.B.); (M.C.S.)
| | - Fuller W. Bazer
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; (F.W.B.); (M.C.S.)
| | - Gregory A. Johnson
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX 77843, USA;
| | - M. Carey Satterfield
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; (F.W.B.); (M.C.S.)
| | - Shannon E. Washburn
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX 77843, USA;
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OLUWOLE DT, EBIWONJUMI O, AJAYI LO, ALABI OD, AMOS V, AKANBI G, ADEYEMI WJ, AJAYI AF. Disruptive consequences of monosodium glutamate on male reproductive function: A review. Curr Res Toxicol 2024; 6:100148. [PMID: 38287921 PMCID: PMC10823071 DOI: 10.1016/j.crtox.2024.100148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/03/2023] [Accepted: 01/04/2024] [Indexed: 01/31/2024] Open
Abstract
Monosodium glutamate (MSG) is one of the most extensively used flavour enhancers worldwide. Although it is widely regarded as a safe food additive with no recommended daily dosage, its over-consumption has been associated with notably pathophysiological events in various tissues and organs of the body. Previous studies have reported of the neuro- cardio- and hepato- toxic effects of its excessive exposure. Moreover, the food additive instigates metabolic dysfunction. It has been established that MSG damages male reproductive accessory organs like prostate glands and epididymis. In addition, it impairs serum enzymatic activities and serum levels of testosterone, gonadotropin-releasing hormone, luteinizing hormone and cholesterol. Reduced sperm count, sperm motility, sperm morphology, and sperm viability, imbalances in male reproductive hormones, alongside alteration in the histoarchitecture of the testes and other male reproductive tissues have also been connected with excessive exposure to MSG. Literature reports affirm the link between the over-consumption of MSG and reproductive organ weight and male sexual behaviour. This review article addresses the multi-systemic effects of exposure to MSG and the possible mechanism of action of the compound with a focus on the negative implications of the food additive on male reproductive functions and the possible role of natural antioxidants in male reproductive functions. carefully selected keywords were used during the literature search to gather credible and up-to-date information about the subject matter.
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Affiliation(s)
- David Tolulope OLUWOLE
- Department of Physiology, College of Health Sciences, Crescent University, Abeokuta, Ogun State, Nigeria
- Department of Physiology, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
| | | | - Lydia Oluwatoyin AJAYI
- Department of Biochemistry, Faculty of Basic Medical Sciences, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
- Anchor Biomed Research Institute, Ogbomoso, Oyo State, Nigeria
| | - Olubunmi Dupe ALABI
- Department of Nutrition and Dietetics, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
| | - Victor AMOS
- Department of Physiology, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
- Anchor Biomed Research Institute, Ogbomoso, Oyo State, Nigeria
| | - Grace AKANBI
- Department of Physiology, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
- Anchor Biomed Research Institute, Ogbomoso, Oyo State, Nigeria
| | | | - Ayodeji Folorunsho AJAYI
- Department of Physiology, College of Health Sciences, Crescent University, Abeokuta, Ogun State, Nigeria
- Department of Physiology, Ladoke Akintola University of Technology, Ogbomoso, Oyo State, Nigeria
- Department of Physiology, Adeleke University, Ede, Osun State, Nigeria
- Anchor Biomed Research Institute, Ogbomoso, Oyo State, Nigeria
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3
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Chaouche L, Marcotte F, Maltais-Payette I, Tchernof A. Glutamate and obesity - what is the link? Curr Opin Clin Nutr Metab Care 2024; 27:70-76. [PMID: 37937722 DOI: 10.1097/mco.0000000000000991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
PURPOSE OF REVIEW Many studies using metabolomics have tried to unravel the metabolic signature of obesity and understand the pathophysiology of this complex and heterogeneous disease. Circulating levels of the amino acid glutamate have been consistently associated with obesity and more specifically with measurements of abdominal fat accumulation. The purpose of this narrative review is to highlight recent studies documenting this association. RECENT FINDINGS Circulating glutamate concentrations have been positively correlated with measurements of central fat accumulation such as waist circumference and visceral adipose tissue area. Moreover, elevated glutamate levels have been linked to a higher prevalence of type 2 diabetes, cardiovascular diseases and nonalcoholic fatty liver disease. The association with adiposity is detected in early life, and genetic predisposition does not appear as a major driver. Glutamate levels reflect in vivo synthesis rather than dietary intake. However, interventions generating metabolic improvements such as incretin receptor agonist treatment or dietary improvements may reduce plasma levels of this amino acid. SUMMARY Recent findings confirm the consistent association between circulating glutamate and abdominal obesity and its cardiometabolic complications. The pathophysiological pathways underlying this phenomenon are still unclear. Furthermore, studies are needed to establish the usefulness of this analyte as a biomarker of abdominal obesity.
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Affiliation(s)
- Lila Chaouche
- Institut universitaire de cardiologie et de pneumologie de Québec - Université Laval
- École de nutrition, Université Laval, Québec, Québec, Canada
| | - Félix Marcotte
- Institut universitaire de cardiologie et de pneumologie de Québec - Université Laval
- École de nutrition, Université Laval, Québec, Québec, Canada
| | - Ina Maltais-Payette
- Institut universitaire de cardiologie et de pneumologie de Québec - Université Laval
- École de nutrition, Université Laval, Québec, Québec, Canada
| | - André Tchernof
- Institut universitaire de cardiologie et de pneumologie de Québec - Université Laval
- École de nutrition, Université Laval, Québec, Québec, Canada
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Löwik MR, Astrup A, Boobis AR, Calder PC, Daniel H, Rietjens IM, Sievenpiper JL, Verhagen H. Risk assessment of nutrients: There must be a threshold for their effects. Regul Toxicol Pharmacol 2024; 146:105539. [PMID: 38072090 DOI: 10.1016/j.yrtph.2023.105539] [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: 07/12/2023] [Revised: 10/20/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
Nutrients serve physiological functions in a dose-dependent manner and that needs to be recognized in risk assessment. An example of the consequences of not properly considering this can be seen in a recent assessment by the European Food Safety Authority (EFSA). EFSA concluded in 2022 that the intake of added and free sugars should be "as low as possible in the context of a nutritionally adequate diet". That conclusion of EFSA is based on the effects on two surrogate endpoints for an adverse effect found in randomized controlled trials with high sugars intake levels: fasting glucose and fasting triglycerides. The lowest intake levels in these trials were around 10 energy% and at this intake level there were no adverse effects on the two outcomes. This indicates that the adverse effects of sugars have an observable threshold value for these two endpoints. The most appropriate interpretation from the vast amount of data is that currently no definitive conclusion can be drawn on the tolerable upper intake level for dietary sugars. Therefore, EFSA's own guidance would lead to the conclusion that the available data do not allow the setting of an upper limit for added sugars and hence, that more robust data are required to identify the threshold value for intake of sugars.
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Affiliation(s)
| | | | - Alan R Boobis
- Faculty of Medicine, Imperial College London, London, W12 0NN, United Kingdom.
| | - Philip C Calder
- Faculty of Medicine, University of Southampton, Southampton, SO16 6YD, United Kingdom.
| | - Hannelore Daniel
- School of Life Sciences, Technical University of Munich, 85354, Freising, Germany.
| | - Ivonne McM Rietjens
- Division of Toxicology, Wageningen University & Research, Wageningen, 6700 EA, the Netherlands.
| | - John L Sievenpiper
- Departments of Medicine and of Nutritional Sciences and Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, M5Ss 1A8, Canada; Division of Endocrinology and Metabolism, Department of Medicine, St. Michael's Hospital, Toronto, ON, M5C 2T2, Canada; Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, M5C 2T2, Canada.
| | - Hans Verhagen
- Food Safety & Nutrition Consultancy, Zeist, 3703 EE, the Netherlands.
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Mennella JA, Smethers AD, Delahanty MT, Stallings VA, Trabulsi JC. Glutamic acid intake by formula-fed infants: are acceptable daily intakes appropriate? Eur J Pediatr 2023; 182:5701-5705. [PMID: 37776354 PMCID: PMC10746772 DOI: 10.1007/s00431-023-05215-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/11/2023] [Accepted: 09/15/2023] [Indexed: 10/02/2023]
Abstract
The 2017 European Food Safety Authority (EFSA) recommendation of an acceptable daily intake (ADI) of 30 mg glutamic acid/kg bw/day did not take into consideration the primary energy sources during infancy, including infant formulas. In the present study, we determined total daily intakes of glutamic acid in a contemporary cohort of healthy infants who were fed either cow milk formula (CMF) or extensive protein hydrolysate formula (EHF); the formulas differed substantially in glutamic acid content. The infants (n = 141) were randomized to be fed either CMF or EHF. Dietary intakes were determined from weighed bottle methods and/or prospective diet records, and body weights were measured on 14 occasions from 0.5 to 12.5 months. Secondary data analysis determined the glutamic acid content of the diet over time. The trial was registered at http://www. CLINICALTRIALS gov/ as NCT01700205, 3 October 2012. Glutamic acid intake from formula and other foods was significantly higher in infants fed EHF when compared to CMF. As glutamic acid intake from formula decreased, intake from other nutritional sources steadily increased from 5.5 months. Regardless of formula type, every infant exceeded the ADI of 30 mg/kg bw/day from 0.5 to 12.5 months. Conclusion: Given that the ADI recommendation was not based on actual intake data of primary energy sources during infancy, the present findings on the growing child's ingestion of glutamic acid from infant formula and the complementary diet may be of interest when developing future guidelines and communications to parents, clinical care providers, and policy makers. WHAT IS KNOWN • The 2017 re-evaluation of the safety of glutamic acid-glutamates and the recommended acceptable daily intake (ADI) of 30 mg/kg bw/d by the European Food Safety Authority (EFSA) did not include actual intake data of the primary energy sources during infancy. WHAT IS NEW • During the first year, glutamic acid intake from infant formula and other food sources exceeded the ADI of 30 mg/kg bw/day.
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Affiliation(s)
- Julie A Mennella
- Monell Chemical Senses Center, Philadelphia, PA, 19104-3308, USA.
| | | | - Michelle T Delahanty
- Department of Behavioral Health and Nutrition, University of Delaware, Newark, DE, 19173, USA
| | - Virginia A Stallings
- Children's Hospital of Philadelphia, Philadelphia, PA; Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, 19146, USA
| | - Jillian C Trabulsi
- Department of Behavioral Health and Nutrition, University of Delaware, Newark, DE, 19173, USA
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Moldovan OL, Vari CE, Tero-Vescan A, Cotoi OS, Cocuz IG, Tabaran FA, Pop R, Fülöp I, Chis RF, Lungu IA, Rusu A. Potential Defence Mechanisms Triggered by Monosodium Glutamate Sub-Chronic Consumption in Two-Year-Old Wistar Rats. Nutrients 2023; 15:4436. [PMID: 37892513 PMCID: PMC10610236 DOI: 10.3390/nu15204436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/15/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023] Open
Abstract
Monosodium glutamate (MSG) is the sodium salt of glutamic acid (GLA), used as a flavour enhancer. MSG is considered a controversial substance. It is incriminated in disturbing the antioxidant system, but also has beneficial effects, as GLA metabolism plays a crucial role in homeostasis. This study highlights which positive or negative aspects of MSG sub-chronic consumption are better reflected in subjects potentially affected by advanced age. Daily doses of MSG were administered to four groups of two-year-old Wistar rats for 90 days: (I) 185 mg/kg bw, (II) 1500 mg/kg bw, (III) 3000 mg/kg bw and (IV) 6000 mg/kg bw, compared to a MSG non-consumer group. Aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, direct and total bilirubin, total cholesterol, triglycerides, creatinine and urea levels were analysed; stomach, liver and kidney samples were subjected to histopathological analysis. Although, in most cases, there were no statistical differences, interesting aspects of the dose-effect relationship were observed. After MSG sub-chronic consumption, the positive aspects of GLA seem to be reflected better than the negative ones. The hormesis effect, with low-level reactive oxygen species' protective effects and GLA metabolism, may represent the hypothesis of a potential defence mechanism triggered by MSG sub-chronic consumption in ageing rats.
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Affiliation(s)
- Octavia-Laura Moldovan
- Medicine and Pharmacy Doctoral School, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Camil-Eugen Vari
- Pharmacology and Clinical Pharmacy Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Amelia Tero-Vescan
- Medical Chemistry and Biochemistry Department, Faculty of Medicine in English, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Ovidiu Simion Cotoi
- Pathophysiology Department, Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (O.S.C.); (I.G.C.)
- Pathology Department, Mures Clinical County Hospital, 540011 Targu Mures, Romania
| | - Iuliu Gabriel Cocuz
- Pathophysiology Department, Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania; (O.S.C.); (I.G.C.)
- Pathology Department, Mures Clinical County Hospital, 540011 Targu Mures, Romania
| | - Flaviu Alexandru Tabaran
- Department of Pathology, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania; (F.A.T.); (R.P.)
| | - Romelia Pop
- Department of Pathology, Faculty of Veterinary Medicine, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, 400372 Cluj-Napoca, Romania; (F.A.T.); (R.P.)
| | - Ibolya Fülöp
- Toxicology and Biopharmacy Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Rafael Florin Chis
- Faculty of Medicine, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Ioana-Andreea Lungu
- Medicine and Pharmacy Doctoral School, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
| | - Aura Rusu
- Pharmaceutical and Therapeutic Chemistry Department, Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540142 Targu Mures, Romania;
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Elango R. Tolerable Upper Intake Level for Individual Amino Acids in Humans: A Narrative Review of Recent Clinical Studies. Adv Nutr 2023; 14:885-894. [PMID: 37062432 PMCID: PMC10334138 DOI: 10.1016/j.advnut.2023.04.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 04/18/2023] Open
Abstract
Individual amino acids are widely popular as supplements because of various perceived and real health benefits. However, currently, there are no recommendations set by national health agencies for tolerable upper intake levels (UL) for amino acids because of a lack of well-conducted human dose-response trials. In the past decade, under the initiative of the International Council on Amino Acid Science, a nonprofit organization, a series of UL human clinical studies were conducted. The goal of this narrative review is to summarize the studies on 6 essential amino acids (leucine, tryptophan, methionine, lysine, histidine, and phenylalanine), 2 nonessential amino acids (arginine and serine), and 2 nonproteinogenic amino acids (ornithine and citrulline) and provide the first set of ULs. A brief background of the concept of the DRI framework of UL, the concept of UL for amino acids, and a perspective of the results are also provided. The data suggest that in relatively healthy adult individuals, the tested amino acids are well tolerated, and ULs, or the no-observed-adverse-effect-level (NOAEL), lowest-observed-adverse-effect-level (LOAEL), can be determined. The ULs were for leucine-young (35 g/d), tryptophan (4.5 g/d), and leucine-elderly (30 g/d); NOAEL and LOAEL for methionine at 3.2 and 6.4 g/d, respectively; NOAEL for arginine (30 g/d); NOAEL and LOAEL for lysine at 6 and 7.5 g/d, respectively; NOAEL and LOAEL for histidine at 8 and 12 g/d, respectively; and NOAEL for phenylalanine (12 g/d), serine (12 g/d), ornithine (12 g/d) and citrulline (24 g/d). This first set of human UL data are hoped to help national and international agencies set safety standards for supplemental amino acids.
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Affiliation(s)
- Rajavel Elango
- Department of Pediatrics, University of British Columbia, British Columbia, Canada; British Columbia Children's Hospital Research Institute, British Columbia Children's Hospital, Vancouver, British Columbia, Canada; School of Population and Public Health, University of British Columbia, British Columbia, Canada.
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Mennella JA, Smethers AD, Delahanty MT, Stallings VA, Trabulsi JC. Glutamic Acid Intake by Formula-Fed Infants: Are Acceptable Daily Intakes Feasible? RESEARCH SQUARE 2023:rs.3.rs-2907953. [PMID: 37292800 PMCID: PMC10246086 DOI: 10.21203/rs.3.rs-2907953/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
PURPOSE The 2017 European Food Safety Authority (EFSA) recommendation of an acceptable daily intake (ADI) of 30 mg glutamic acid/kg bw/d did not take into consideration the primary energy sources during infancy, including infant formulas. In the present study, we determined total daily intakes of glutamic acid in a contemporary cohort of healthy infants who were fed either cow milk formula (CMF) or extensive protein hydrolysate formulas (EHF); the formulas differed in glutamic acid content (262.4 mg/100ml, CMF; 436.2 mg/100ml, EHF). METHODS The infants ( n = 141) were randomized to be fed either CMF or EHF. Daily intakes were determined from weighed bottle methods and/or prospective diet records, and body weights and lengths were measured on 15 occasions from 0.5 to 12.5 months. The trial was registered on http://www. CLINICALTRIALS gov/ as trial registration number NCT01700205 on 3 October 2012. RESULTS Glutamic acid intake from formula and other foods was significantly higher in infants fed EHF when compared to CMF. As glutamic acid intake from formula decreased, intake from other nutritional sources steadily increased from 5.5 months. Regardless of formula type, every infant exceeded the ADI of 30 mg/kg bw/d from 0.5 to 12.5 months. CONCLUSIONS Faced with the knowledge that the EFSA health-based guidance value (ADI) was not based on actual intake data and did not account for the primary energy sources during infancy, EFSA may reconsider the scientific literature on growing children's intakes from human milk, infant formula, and the complementary diet to provide parents and health care providers with revised guidelines.
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Zhou Y, Sui H, Wang Y, Yong L, Zhang L, Liang J, Zhou J, Xu L, Zhong Y, Chen J, Song Y. Dietary Exposure to Glutamates of 2- to 5-Year-Old Toddlers in China Using the Duplicate Diet Method. Foods 2023; 12:foods12091898. [PMID: 37174436 PMCID: PMC10178738 DOI: 10.3390/foods12091898] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 04/11/2023] [Accepted: 04/18/2023] [Indexed: 05/15/2023] Open
Abstract
A duplicate diet collection method was used to estimate dietary exposure to glutamates in children aged 2-5 years in selected provinces of China. Daily duplicate diet samples were collected from 86 healthy toddlers over three consecutive days. Glutamates were analyzed using ultra-high-pressure liquid chromatography-MS/MS (UHPLC-MS/MS). Results showed that the highest glutamates content was found in mixed meals, at 5.12 mg/kg, followed by powdered formula (3.89 mg/kg), and milk and dairy products (2.29 mg/kg). The total mean daily dietary exposure for subjects was 0.20 mg/kg BW, and P95 daily dietary exposure was 0.44 mg/kg BW, both below the acceptable daily intake (ADI) (120 mg/kg BW) recommended by the Joint (FAO/WHO) Expert Committee on Food Additives (JECFA) and the ADI (30 mg/kg BW) set by the European Food Safety Authority (EFSA). Hence it can be considered that glutamates exposure would cause low risk in this group.
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Affiliation(s)
- Yanjun Zhou
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Haixia Sui
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Yibaina Wang
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Ling Yong
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Lei Zhang
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Jiang Liang
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
| | - Jing Zhou
- Shanghai Institute of Quality Inspection and Technical Research, Shanghai 200233, China
| | - Lili Xu
- Heilongjiang Provincial Center for Disease Control and Prevention, Harbin 150030, China
| | - Yanxu Zhong
- Guangxi Center for Disease Prevention and Control, Nanning 530028, China
| | - Jinyao Chen
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China
| | - Yan Song
- Key Laboratory of Food Safety Risk Assessment, National Health Commission of the People's Republic of China, China National Center for Food Safety Risk Assessment, Beijing 100022, China
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Karakawa S, Smriga M, Arashida N, Nakayama A, Miyano H. Analytical Chemistry of Impurities in Amino Acids Used as Nutrients: Recommendations for Regulatory Risk Management. Nutrients 2022; 14:nu14142838. [PMID: 35889795 PMCID: PMC9319416 DOI: 10.3390/nu14142838] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/05/2022] [Accepted: 07/08/2022] [Indexed: 12/05/2022] Open
Abstract
Proteinogenic amino acids are natural nutrients ingested daily from standard foods. Commercially manufactured amino acids are added to a wide range of nutritional products, including dietary supplements and regular foods. Currently, the regulatory risk management of amino acids is conducted by means of setting daily maximum limits of intake. However, there have been no reported adverse effects of amino acid overdosing, while impurities in low-quality amino acids have been identified as causative agents in several health hazard events. This paper reviews the analytical chemistry of impurities in amino acids and highlights major variations in the purity of commercial products. Furthermore, it examines the international standards and global regulatory risk assessment of amino acids utilized in dietary supplements and foods, recommending (1) further research on analytical methods that can comprehensively separate impurities in amino acids, and (2) re-focusing on the regulatory risk management of amino acids to the analytical chemistry of impurities.
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Affiliation(s)
- Sachise Karakawa
- Research Institute for Bioscience Products & Fine Chemicals, Ajinomoto Co., Inc., Kawasaki 210-8681, Japan; (N.A.); (A.N.); (H.M.)
- Correspondence:
| | - Miro Smriga
- Quality Assurance Department, Ajinomoto Co., Inc., Tokyo 104-8315, Japan;
| | - Naoko Arashida
- Research Institute for Bioscience Products & Fine Chemicals, Ajinomoto Co., Inc., Kawasaki 210-8681, Japan; (N.A.); (A.N.); (H.M.)
| | - Akira Nakayama
- Research Institute for Bioscience Products & Fine Chemicals, Ajinomoto Co., Inc., Kawasaki 210-8681, Japan; (N.A.); (A.N.); (H.M.)
| | - Hiroshi Miyano
- Research Institute for Bioscience Products & Fine Chemicals, Ajinomoto Co., Inc., Kawasaki 210-8681, Japan; (N.A.); (A.N.); (H.M.)
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AL-Nasser MN, Mellor IR, Carter WG. Is L-Glutamate Toxic to Neurons and Thereby Contributes to Neuronal Loss and Neurodegeneration? A Systematic Review. Brain Sci 2022; 12:577. [PMID: 35624964 PMCID: PMC9139234 DOI: 10.3390/brainsci12050577] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/26/2022] [Accepted: 04/26/2022] [Indexed: 01/27/2023] Open
Abstract
L-glutamate (L-Glu) is a nonessential amino acid, but an extensively utilised excitatory neurotransmitter with critical roles in normal brain function. Aberrant accumulation of L-Glu has been linked to neurotoxicity and neurodegeneration. To investigate this further, we systematically reviewed the literature to evaluate the effects of L-Glu on neuronal viability linked to the pathogenesis and/or progression of neurodegenerative diseases (NDDs). A search in PubMed, Medline, Embase, and Web of Science Core Collection was conducted to retrieve studies that investigated an association between L-Glu and pathology for five NDDs: Alzheimer's disease (AD), Parkinson's disease (PD), multiple sclerosis (MS), amyotrophic lateral sclerosis (ALS), and Huntington's disease (HD). Together, 4060 studies were identified, of which 71 met eligibility criteria. Despite several inadequacies, including small sample size, employment of supraphysiological concentrations, and a range of administration routes, it was concluded that exposure to L-Glu in vitro or in vivo has multiple pathogenic mechanisms that influence neuronal viability. These mechanisms include oxidative stress, reduced antioxidant defence, neuroinflammation, altered neurotransmitter levels, protein accumulations, excitotoxicity, mitochondrial dysfunction, intracellular calcium level changes, and effects on neuronal histology, cognitive function, and animal behaviour. This implies that clinical and epidemiological studies are required to assess the potential neuronal harm arising from excessive intake of exogenous L-Glu.
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Affiliation(s)
- Maryam N. AL-Nasser
- Department of Biological Sciences, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia;
- School of Life Sciences, Faculty of Medicine and Health Sciences, University of Nottingham, Nottingham NG7 2RD, UK;
- School of Medicine, Royal Derby Hospital Centre, University of Nottingham, Derby DE22 3DT, UK
| | - Ian R. Mellor
- School of Life Sciences, Faculty of Medicine and Health Sciences, University of Nottingham, Nottingham NG7 2RD, UK;
| | - Wayne G. Carter
- School of Medicine, Royal Derby Hospital Centre, University of Nottingham, Derby DE22 3DT, UK
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12
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Loï C, Cynober L. Glutamate: A Safe Nutrient, Not Just a Simple Additive. ANNALS OF NUTRITION AND METABOLISM 2022; 78:133-146. [PMID: 35172302 DOI: 10.1159/000522482] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 02/04/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND In 2017, an European Food Safety Authority (EFSA) opinion on the use of glutamate and its salts as food additives led to an ADI of 30mg/kg body weight/day. Then, in 2021, an EFSA statement presented a proposal for harmonising the establishment of Health-Based Guidance Values for nutrients that are also regulated substances (including food additives). The present review argues that the 2017 glutamate ADI is unsuitable because safety of glutamate should firstly consider its status as a nutrient and not only as an additive. SUMMARY Glutamate is a non-essential amino acid playing a key role in nitrogen homeostasis. The dietary exposure to glutamate in adults is extensive, due to its ubiquitous presence in foods, under three forms: bound to proteins, naturally free and free form added as an additive. Glutamate naturally included into proteins is the major source of dietary glutamate. Thus, since it plays a role in nitrogen homeostasis, it is a nutrient before being an additive. Its pharmacokinetics is largely impacted by concomitant food intake but the extent to which plasma glutamate concentration must rise to have deleterious effects is never encountered in humans consuming glutamate in their daily diets. This is due to the fact that glutamate is highly metabolized in the splanchnic area. Key Messages: Glutamate should be considered as a safe nutrient before as an additive by risk assessor.
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Affiliation(s)
| | - Luc Cynober
- Laboratoire de Biologie de la Nutrition, URP 4466, Faculté de Pharmacie, Université de Paris, Paris, France
- Service de Biochimie, Hôpital Cochin, AP-HP, Paris, France
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13
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Rico-Yuson CA, Hornyak GL, Bora T. Cyanide-free environment-friendly alternative to copper electroplating for zinc die-cast alloys. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:38065-38073. [PMID: 33725308 DOI: 10.1007/s11356-021-13398-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
In this paper, a cyanide-free electroplating bath containing glutamate as a complexing agent is investigated as an environment-friendly alternative for copper plating on zinc die-cast alloys. Glutamate reacts with copper in an aqueous solution that exhibits similar copper cyanide properties by forming complexes. The electroplating bath pH is chosen from equilibrium diagrams to avoid the formation of insoluble complexes and oxides at varying copper-to-glutamate molar ratio. The plating bath's electrochemical response on a stationary electrode confirms that a 1:3 molar ratio between copper and glutamate at pH 8 exhibits better copper deposition onto the substrate, with its morphology characterized using SEM. The results suggest that the copper glutamate electroplating bath can be suitable for copper cyanide bath replacement without additives, allowing a one-step electroplating process. Moreover, the polarization and electrochemical impedance measurements suggest inhibition of the substrate's corrosion when copper was electroplated at a 1:3 copper-to-glutamate molar ratio. With the careful control of the concentration ratio, the process can provide adequate copper deposition and anti-corrosion capability suitable for green nanocoating applications.
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Affiliation(s)
- Christine Adelle Rico-Yuson
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, PO Box 4, Klong Luang, Pathumthani, 12120, Thailand
- Department of Physics, College of Arts and Sciences, Central Mindanao University, Musuan, 8710, Maramag, Bukidnon, Philippines
| | - G Louis Hornyak
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, PO Box 4, Klong Luang, Pathumthani, 12120, Thailand
| | - Tanujjal Bora
- Center of Excellence in Nanotechnology, School of Engineering and Technology, Asian Institute of Technology, PO Box 4, Klong Luang, Pathumthani, 12120, Thailand.
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14
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Subchronic Tolerance Trials of Graded Oral Supplementation with Phenylalanine or Serine in Healthy Adults. Nutrients 2021; 13:nu13061976. [PMID: 34201370 PMCID: PMC8227932 DOI: 10.3390/nu13061976] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 06/04/2021] [Accepted: 06/05/2021] [Indexed: 12/12/2022] Open
Abstract
Phenylalanine and serine are amino acids used in dietary supplements and nutritional products consumed by healthy consumers; however, the safe level of phenylalanine or serine supplementation is unknown. The objective of this study was to conduct two 4-week clinical trials to evaluate the safety and tolerability of graded dosages of oral phenylalanine and oral serine. Healthy male adults (n = 60, 38.2 ± 1.8y) completed graded dosages of either phenylalanine or serine supplement (3, 6, 9 and 12 g/d) for 4 weeks with 2-week wash-out periods in between. Primary outcomes included vitals, a broad spectrum of circulating biochemical analytes, body weight, sleep quality and mental self-assessment. At low dosages, minor changes in serum electrolytes and plasma non-essential amino acids glutamine and aspartic acid concentrations were observed. Serine increased its plasma concentrations at high supplemental dosages (9 and 12 g/day), and phenylalanine increased plasma tyrosine concentrations at 12 g/day, but those changes were not considered toxicologically relevant. No other changes in measured parameters were observed, and study subjects tolerated 4-week-long oral supplementation of phenylalanine or serine without treatment-related adverse events. A clinical, no-observed-adverse-effect-level (NOAEL) of phenylalanine and serine supplementation in healthy adult males was determined to be 12 g/day.
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15
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Haddad M, Esmail R, Khazali H. Reporting The Effects of Exposure to Monosodium Glutamate on The Regulatory Peptides of The Hypothalamic-Pituitary-Gonadal Axis. INTERNATIONAL JOURNAL OF FERTILITY & STERILITY 2021; 15:246-251. [PMID: 34913291 PMCID: PMC8530211 DOI: 10.22074/ijfs.2021.522615.1072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Accepted: 05/01/2021] [Indexed: 11/14/2022]
Abstract
Monosodium glutamate (MSG) is a flavour enhancer that is used as a food additive (E621) in many parts of the world, especially in East Asian countries. However, in recent studies, it has been used as a neurotoxin because MSG is reported to cause neural degeneration in the hypothalamic arcuate of neonatal animals. The results of several studies show the negative effects of MSG injections on different parts of the hypothalamic-pituitary-gonadal (HPG) axis, in addition to its ability to inhibit secretion many reproductive neuropeptides, neurotrophic factors, and hormones, all of which play vital roles in the regulation of reproductive function. Oral administration or injection of large quantities of MSG into newborn animals results in a decrease in or overabundance of the production of many regulatory peptides of the male and female reproductive systems. In this review, we summarize the results of the most important studies that have examined the effect of oral consumption or injection of MSG on regulatory peptides of the HPG axis.
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Affiliation(s)
- Muhammad Haddad
- Department of Animal Sciences and Marine Biology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Rafat Esmail
- Department of Food Sciences, Faculty of Agriculture, Damascus University, Damascus, Syria
| | - Homayoun Khazali
- Department of Animal Sciences and Marine Biology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran,Department of Animal Sciences and Marine BiologyFaculty
of Life Sciences and BiotechnologyShahid Beheshti UniversityTehranIran
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16
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A chemical-specific adjustment factor for human interindividual differences in kinetics for glutamates (E620-625). Food Chem Toxicol 2020; 147:111910. [PMID: 33309877 DOI: 10.1016/j.fct.2020.111910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 12/01/2020] [Accepted: 12/03/2020] [Indexed: 12/26/2022]
Abstract
Use of a default methodology for establishment of a health-based guidance value (HBGV) resulted in a group acceptable daily intake (ADI) for glutamates (E620-625) below the normal dietary glutamate intake, and also lower than the intake of free glutamate by breast fed babies. Use of a chemical-specific adjustment factor (CSAF) may overcome this problem. The present study investigates the interindividual human variability in glutamate plasma and brain levels in order to define a CSAF for the interindividual variation in kinetics, a HKAF, for glutamates. Human clinical data on plasma glutamate levels available from different groups of subjects at Mitsui Memorial Hospital as well as literature data on plasma and brain-related glutamate levels were collected and analysed. The median HKAF value obtained amounted to 2.62-2.74 to 2.33-2.52 for plasma derived values and to 1.68-1.81 for brain derived values. Combining these values with the CSAF for the interspecies differences in kinetics of 1 and the default factors for interspecies and interindividual differences in dynamics of 2.5 and 3.16 results in an overall CSAF of 16-20. Using this CSAF will result in a HBGV for glutamate that is no longer below the acceptable range of oral intake (AROI).
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Smriga M. International Regulations on Amino Acid Use in Foods and Supplements and Recommendations to Control Their Safety Based on Purity and Quality. J Nutr 2020; 150:2602S-2605S. [PMID: 33000158 DOI: 10.1093/jn/nxaa093] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 02/04/2020] [Accepted: 03/16/2020] [Indexed: 11/12/2022] Open
Abstract
We examined international regulatory developments related to the use of proteinogenic amino acids in human nutrition and concluded that the current risk-assessment practices tend to focus exclusively on setting maximum daily limits. In this brief review we argue that controlling the standards of purity and ingredient quality are the key safety issues that should be considered during risk assessment. Moreover, if maximum intake limits on amino acids are implemented, they should be defined using a well-established rationale for the health risks associated with high intakes. This would avoid setting limits that are so low that they render the dietary supplements ineffective and which, therefore, could mislead the consumer. We further suggest that there should be greater regional concordance in how the use of amino acids as ingredients is regulated and use the capacity of industry to oversee pre-competitive issues, such as standards of purity and scientific research on the safety of generic ingredients. Our arguments are based on clinical safety scientific research and oversights of amino acid purity standards conducted in the last decade by the not-for-profit international association, the International Council on Amino Acid Science.
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Affiliation(s)
- Miro Smriga
- International Council on Amino Acid Science, Brussels, Belgium
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18
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Abstract
PURPOSE OF REVIEW Total glutamate (Glu) intake is 5-20 g/day in adults and about 40 mg/kg in breast-fed infant. Glu intake is constituted by Glu from protein and free Glu from certain foods and flavor-enhancing additive. The admissible intake of free Glu additive is addressed. RECENT FINDING In the gut, Glu is actively metabolized by enterocytes and because of this metabolism, the systemic availability of ingested Glu remains relatively low. Human studies are preferred to assess the transfer in blood of dietary free Glu salts and their possible risks. When human data are not available, experimental animal models provide the basis to assess the risks to humans but toxicity studies in rodents remain for a part controversial. A No Observable Adverse Effect Level (NOAEL) in rodent of 3200 mg/kg/day and an uncertainty factor of 100 lead to an acceptable daily intake (ADI) of 30 mg/kg/day for free Glu salts used as additives, whereas a NOAEL higher than 6000 mg/kg/day and an uncertainty factor of 25 leads to an ADI of 240 mg/kg/day for free Glu salts. SUMMARY Current discussions indicate an ADI from 30 to 240 mg/kg/day depending on the chosen NOAEL in animal model and compound-specific uncertainty factor (from 25 to 100).
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Affiliation(s)
- Daniel Tomé
- UMR PNCA, INRA, AgroParisTech, Université Paris-Saclay, Paris, France
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