Glutamate flavoring


Glutamate flavoring is a generic name for the flavor-enhancing compounds based on glutamic acid and its salts. These compounds provide an umami taste to food.
Glutamic acid and glutamates are natural constituents of many fermented or aged foods, including soy sauce, fermented bean paste, and cheese. They can also be found in hydrolyzed proteins such as yeast extract. The sodium salt of glutamic acid, monosodium glutamate is manufactured in a large scale and widely used in the food industry.

Glutamic acid versus glutamates

When glutamic acid or any of its salts is dissolved in water, it immediately forms a solution of separate negative ions, called glutamates, and positive ions like hydronium| or sodium|. There is actually a chemical equilibrium among several ionized forms, including zwitterions, that depends on the acidity of the solution. Within the common pH range of foods, the prevailing ion can be described as −OOC-C-2-COO−, with a net −1 electric charge.
Only the glutamate ion is responsible for the umami flavor, so the effect does not depend significantly on the starting compound. However, some crystalline salts such as monosodium glutamate dissolve much better and faster than crystalline glutamic acid. This has proven to be an important factor in the implementation of substances as flavor enhancers.

Discovery

Although they occur naturally in many foods, glutamic acid and other amino acid flavor contributions were only scientifically identified early in the twentieth century. In 1866, German chemist Karl Heinrich Ritthausen discovered and identified the compound. In 1907, Japanese researcher Kikunae Ikeda of the Tokyo Imperial University identified brown crystals left behind after the evaporation of a large amount of kombu broth as glutamic acid. These crystals, when tasted, reproduced the ineffable but undeniable flavor he detected in many foods, most especially in seaweed. Professor Ikeda coined the term for this flavor as umami. He then patented a method of mass-producing a crystalline salt of glutamic acid, known as monosodium glutamate.

Isomers

Further research into the compound has found that only the L-glutamate enantiomer has flavor-enhancing properties. Manufactured monosodium glutamate contains over 99.6% of the naturally-predominant L-glutamate form, which is a higher proportion of L-glutamate than can be found in the free glutamate ions of fermented naturally-occurring foods. Fermented products such as soy sauce, steak sauce, and Worcestershire sauce have levels of glutamate similar to foods with added monosodium glutamate. However, only 5% or more of the glutamate may be the D-enantiomer. Nonfermented naturally-occurring foods have lower relative levels of D-glutamate than fermented products.

Taste perception

Glutamic acid stimulates specific receptors located in taste buds such as the amino acid receptor T1R1/T1R3, or other glutamate receptors like the metabotropic receptors which induce the flavor profile known as umami. It is classified as one of the five basic tastes.
The flavoring effect of glutamate come with its free form, where it is not bound to other amino acids in protein. Nonetheless, glutamate by itself does not elicit an intense umami taste. The mixing of glutamate with nucleotides inosine-5'-monophosphate or guanosine-5'-monophosphate enhances the taste of umami; T1R1–T1R3 responds primarily to mixtures of glutamate and nucleotides. While researches show that the synergism occurs in some animal species with other amino acids, studies of human taste receptors show that the same reaction only occur between glutamate and the selected nucleotides. Moreover, sodium in monosodium glutamate may activate glutamate to produce a stronger umami taste.
Two hypotheses for the explanation of umami taste transduction have been introduced: The umami taste is transduced by an N-methyl-D-aspartate type glutamate ion channel receptor; or is transduced by a metabotropic type glutamate receptor. The metabotropic glutamate receptors such as mGluR4 and mGluR1 can be easily activated at glutamate concentration levels found in food.

Natural occurrence

itself is ubiquitous in biological life. It is found naturally in all living cells, primarily in the bound form as a constituent of proteins. Only a fraction of the glutamate in foods is in its "free" form, and only free glutamate can enhance the flavor of foods. Part of the flavor-enhancing effect of the following: tomatoes, fermented soy products, yeast extracts, certain sharp cheeses, and fermented or hydrolyzed protein products is due to the presence of free glutamate ions.

Asia

Japanese cuisine originally used broth made from kombu to bring up the umami taste in soups. Manufacturers, such as Ajinomoto, use selected strains of Corynebacterium glutamicum bacteria in a nutrient-rich medium. The bacteria are selected for their ability to excrete glutamic acid, which is then separated from the nutrient medium and processed into its sodium salt, monosodium glutamate.

Rome

In the Roman Empire glutamic acid was found in a sauce called garum, made from fermenting fish in saltwater. The flavor enhancing properties of glutamic acid allowed Romans to reduce the use of expensive salt.

Concentration in foods

The following table illustrates the glutamate content of some selected common foods. Free glutamate is the form directly tasted and absorbed, while glutamate bound in protein is not available until further breakdown by digestion or cooking. In general, vegetables contain more free glutamate but less protein-bound glutamate.
FoodFree glutamate Protein glutamate
Makombu 3190
Rausu kombu 2286
Rishiri kombu 1985
Hidaka kombu 1344
Nori 1378
Marmite1960
Vegemite1431
Japanese fish sauce1383
Roquefort cheese1280
Parmesan cheese12009847
Korean soy sauce1264
Chinese soy sauce926
Japanese soy sauce782
Oyster sauce900
Green Tea668
Cured Ham337
Sardine280
Grape juice258
Clam208
Scallop159
Squid146
Oyster137
Mussel105
Peas2005583
Tomatoes140238
Corn1301765
Potatoes102
Cow milk2819
Human milk22229
Eggs231583
Chicken443309
Duck693636
Beef332846
Pork232325
Salmon202216

Hydrolyzed protein

s, or protein hydrolysates, are acid- or enzymatically treated proteins from certain foods. One example is yeast extract. Hydrolyzed protein contains free amino acids, such as glutamate, at levels of 5% to 20%. Hydrolyzed protein is used in the same manner as monosodium glutamate in many foods, such as canned vegetables, soups, and processed meats.

Safety as a flavor enhancer

Studies

Monosodium glutamate is regarded as safe for consumption. An association between MSG consumption and a constellation of symptoms has not been demonstrated under rigorously controlled conditions. Techniques used to adequately control for experimental bias include a placebo-controlled double-blinded experimental design and the use of capsules to deliver the compound to mask the strong and unique after-taste of glutamates. Even though there are also reports of MSG sensitivity among a subset of the population, this has not been demonstrated in placebo‐controlled trials.

Controversy

Origin

The controversy surrounding the safety of MSG started on 4 April 1968, when Dr. Robert Ho Man Kwok wrote a correspondence letter to the New England Journal of Medicine, coining the term Chinese restaurant syndrome. In his letter, Kwok suggested several possible causes before he nominated MSG for his symptoms. This letter was initially met with insider satirical responses, often using race as prop for humorous effect, within the medical community. During the discursive uptake in media, the conversations were recontextualized as legitimate while the race-based motivations of the humor were not parsed and historical racial prejudices were replicated.
In January 2018, Dr. Howard Steel came forth claiming that it was actually a prank submission by him under a pseudonym. However, it turned out that there was a Dr. Robert Ho Man Kwok who worked at the National Biomedical Research Foundation, both names Steel claimed to have invented. Kwok's children, his colleague at the research foundation, and the son of his boss there confirmed that Dr. Robert Ho Man Kwok, who had died in 2014, wrote this letter. After hearing about Kwok's family, Steel's daughter Anna came to believe that the admission that the letter was a prank was itself one of the last pranks by her late father.

Reactions

The misconceptions about MSG are tied to racial stereotypes about East Asians, with people specifically targeting East Asian cuisine, whereas the widespread usage of MSG in Western processed food doesn't generate the same stigma. For instance, the perpetuation of the negative image of MSG through the so-called Chinese restaurant syndrome has been attributed to xenophobic or racist biases.
In 2020, Ajinomoto along with other activists launched the #RedefineCRS campaign to combat the myth that MSG is harmful to people's health, which highlights both the underlying xenophobic biases against East Asian cuisine and the scientific evidence that the myth is false. Following the #RedefineCRS campaign, Merriam-Webster announced it will be reviewing the term, which was added to its dictionary in 1993.

Regulations

Regulation timeline

In 1959, the U.S. Food and Drug Administration classified monosodium glutamate as generally recognized as safe. This action stemmed from the 1958 Food Additives Amendment to the Federal Food, Drug, and Cosmetic Act that required premarket approval for new food additives and led the FDA to promulgate regulations listing substances, such as monosodium glutamate, which have a history of safe use or are otherwise GRAS.
Since 1970, FDA has sponsored extensive reviews on the safety of monosodium glutamate, other glutamates, and hydrolyzed proteins, as part of an ongoing review of safety data on GRAS substances used in processed foods. One such review was by the Federation of American Societies for Experimental Biology Select Committee on GRAS Substances. In 1980, the committee concluded that monosodium glutamate was safe at current levels of use but recommended additional evaluation to determine monosodium glutamate's safety at significantly higher levels of consumption. Additional reports attempted to look at this.
In 1986, FDA's Advisory Committee on Hypersensitivity to Food Constituents concluded that monosodium glutamate poses no threat to the general public but that reactions of brief duration might occur in some people. Other reports have given the following findings:
Following the compulsory EU-food labeling law the use of glutamic acid and its salts has to be declared, and the name or E number of the salt has to be listed. Glutamic acid and its salts as food additives have the following E numbers: glutamic acid: E620, monosodium glutamate: E621, monopotassium glutamate: E622, calcium diglutamate: E623, monoammonium glutamate: E624, and magnesium diglutamate: E625. In the European Union, these enhancers are not allowed to be added to milk, emulsified fat and oil, pasta, cocoa/chocolate products and fruit juice. The EU has not yet published an official NOAEL for glutamate, but a 2006 consensus statement of a group of German experts drawing from animal studies was that a daily intake of glutamic acid of 6 grams per kilogram of body weight is safe. From human studies, the experts noted that doses as high as 147 g/day produced no adverse effects in males when given for 30 days; in a 70 kg male that corresponds to 2.1 g per kg of body weight.

United States

In 1959, the Food and Drug Administration classified MSG as a "generally recognized as safe" food ingredient under the Federal Food, Drug, and Cosmetic Act. In 1986, FDA's Advisory Committee on Hypersensitivity to Food Constituents also found that MSG was generally safe, but that short-term reactions may occur in some people. To further investigate this matter, in 1992 the FDA contracted the Federation of American Societies for Experimental Biology to produce a detailed report, which was published in 1995. The FASEB report reaffirmed the safety of MSG when it is consumed at usual levels by the general population, and found no evidence of any connection between MSG and any serious long-term reactions.
Under 2003 U.S. Food and Drug Administration regulations, when monosodium glutamate is added to a food, it must be identified as "monosodium glutamate" in the label's ingredient list. Because glutamate is commonly found in food, primarily from protein sources, the FDA does not require foods and ingredients that contain glutamate as an inherent component to list it on the label. Examples include tomatoes, cheeses, meats, hydrolyzed protein products such as soy sauce, and autolyzed yeast extracts. These ingredients are to be declared on the label by their common or usual names. The term 'natural flavor' is now used by the food industry when using glutamic acid. Because of lack of regulation, it is impossible to determine what percentage of 'natural flavor' is actually glutamic acid.
The food additives disodium inosinate and disodium guanylate are usually used in synergy with monosodium glutamate-containing ingredients, and provide a likely indicator of the addition of glutamate to a product.
As of 2002 the National Academy of Sciences Committee on Dietary Reference Intakes had not set a NOAEL or LOAEL for glutamate.

Australia and New Zealand

Standard 1.2.4 of the Australia New Zealand Food Standards Code requires the presence of monosodium glutamate as a food additive to be labeled. The label must bear the food additive class name, followed by either the name of the food additive or its International Numbering System number

Canada

The Canada Food Inspection Agency considers claims of "no MSG" or "MSG free" to be misleading and deceptive when other sources of free glutamates are present.

Ingredients

Forms of glutamic acid that can be added to food include:
The following are also rich sources of glutamic acid, and may be added to enhance flavor:
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