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Yeast Extract – Information for Food Professionals

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Yeast Extract – Information for Food Professionals Yeast extract – Information for food professionals 1 Contents The production of yeast extract 4 • Diagram: production of yeast extract Yeast extract in the food producing industry – a seasoning ingredient 6 A comparison of amino acid profiles 7 • Diagram: amino acids in different foodstuffs The “umami” taste – essential component of savoury meals 8 Yeast extract: natural glutamate 9 • Labelling • Free and bound glutamate – what is behind all this? How is yeast extract used in food production? 11 • Spider-diagram: effects of yeast extract About EURASYP 13 • Who is EURASYP? • Contact • Members of EURASYP 3 The production of yeast extract The natural ingredient yeast extract is The yeast stops growing at approximately produced in three steps: First sugar is added 40 degrees Celsius. The enzymes in the yeast to the yeast, so it can grow. In the second or added enzymes break down the contained step, enzymes already enclosed in the yeast yeast protein and other macromolecules into split the proteins contained in the yeast into smaller molecules. The cell walls of the yeast smaller building blocks and ensure that the cells also disintegrate. This means that the wall of the yeast cell becomes permeable – smaller molecules can now leave the yeast cell this process is called autolysis. Finally the and mix with the aqueous solution in the tank. ingredients dissolved out of the yeast cell – the yeast extract – are separated from the This autolysis process can be controlled using surrounding cell wall and dried. a variety of factors. For example, it is the retention time of the yeast in the tanks or the The yeast fungus was already an impor- temperature that play an important role and tant part of food culture in earlier advanced have a significant influence on the future taste civilizations – it was not only used for baking of the respective yeast extract. The product bread but also for making beer and wine. Yeast resulting from the autolysis process is a liquid extract also is made from natural bakers‘ or that already tastes like a bouillon and, in fact, brewers‘ yeast. also has a very similar amino acid profile to a cooked meat stock (Please also cf. “A compari- In order to obtain the yeast extract, the yeast son of amino acid profiles” on page 7). is fermented first: Sugar is added to nourish the yeast fungus. In addition, a temperature To become yeast extract, the liquid must now of 30 degrees Celsius and a sufficient supply only be centrifuged in order to remove the re- of oxygen are ensured in large containers, the maining cell walls. Valuable proteins, vitamins so-called fermenters. So basically, the condi- and minerals from the yeast cell remain preser- tions are the same like when baking at home, ved in the yeast extract. In simple terms, yeast so that the yeast can develop and grow in the extract contains all the natural components of best possible way. When the fermenter is full the yeast cell without the surrounding cell wall. and no more sugar can be added, the yeast is concentrated and washed in centrifuges in order to remove the sugar residues. The result is a so-called suspension, a viscous, creamy yeast mass. Then a process called autolysis is effected at a temperature of 45-55 degrees Celsius – like- wise under controlled conditions in large tanks: 4 Finally, the yeast extract is concentrated in a gentle evaporation process under vacuum conditions at around 60 degrees Celsius – to a paste with 70-80 per cent dry weight or to a liquid with 45-65 per cent dry weight. Depen- ding on the future use, the liquid yeast extract is then dried and pulverized: The liquid is fed into a so-called spray tower and dried using hot air. The water evaporates during this process so that the dried extract falls down and collects at the base of the tower. Production of yeast extract Evaporation Liquid and Fermentation Autolysis Centrifugation concentration Paste Separation Powder Yeast cell of cell walls Growth of yeast Spray drying 5 Yeast extract in the food producing industry – a seasoning ingredient In media coverage there is sometimes the How does natural glutamate basically affect accusation that yeast extract is a kind of “hid- the taste of foods? What effect is achieved? den flavour enhancer”. But just what function If glutamate is used as an isolated pure does yeast extract have in food production? substance, then it is deemed an additive and EURASYP asked the expert Prof. Dr.-Ing. must be included in the list of ingredients. This Achim Stiebing, Head of the Institute for Food enhances the characteristic tastes of dishes. Technology.NRW (North-Rhine Westphalia, The taste “umami” can be translated as “mea- Germany) at the University of Applied Sciences ty”, “savoury” or “tasty” and is also provided by Ostwestfalen-Lippe, vice-president of the Ger- natural glutamic acid. Umami is now counted man Agricultural Society (Deutsche Landwirt- among the five recognised basic tastes along- schafts-Gesellschaft DLG) and member of the side sweet, sour, salty and bitter. board of trustees of the German Consumer Foundation (Stiftung Warentest). Does the food producing industry aim to achieve a particularly high glutamate per- Yeast extract is criticised as an ingredient centage when developing recipes and adding because it contains the amino acid glutamate. ingredients such as yeast extract? How do you assess the use of yeast extract in Yeast extract is not used as a tactical move, food production? but as a condiment. The dosages are different Yeast extract contains the macronutrients depending on the desired effect: The added proteins and carbohydrates and furthermore amounts are very small to round off a taste, the micronutrients vitamins and minerals. The whereas, if you wish to achieve a bouillon proportion of glutamate is usually low – below impression, for example in vegetarian dishes, five per cent. Yeast extract is a natural ingre- it will be much higher. However, the myth that dient and not an additive. I see many advanta- glutamate can make up for inferior quality in ges of using yeast extract in food production industrially produced foods is simply false. – also speaking as a consumer – since the taste inherent to savoury products can be balanced with the optimal dose. Which ingredients introduce natural glutama- te into food products? Glutamate is the sodium salt of glutamic acid. Glutamic acid occurs naturally in numerous foodstuffs – also in unprocessed foods. For ex- ample, glutamic acid is contained in meat, fish and milk products, but also in some vegetables. Especially high concentrations can be found in Parmesan cheese and soy sauce that are popular condiments used in the kitchen when preparing meals. 6 A comparison of amino acid profiles The natural ingredient yeast extract is someti- Two facts become very clear: Firstly, the glu- mes criticized because of its natural glutamate tamic acid is only one of many other natural content – however, it is a fact that many more amino acids that occur in our food. And se- foodstuffs apart from yeast extract contain condly, the content of the amino acid glutama- glutamate by nature. The diagram uses the te (glutamic acid) in the yeast extract paste is examples of tomato paste, Parmesan cheese, comparable with the content in tomato paste pure beef stock cubes and yeast extract paste and in a beef stock cube – the clear leader is to show the presence of different amino acids matured Parmesan cheese. in the respective foodstuff. Amino acids in different foodstuffs Concentration of amino acids (mg/100g) Concentration Tomato paste Parmesan Beef soup stock cubes Yeast extract (spread paste) 7 The “umami” taste – essential component of savoury meals The term “umami” is Japanese and can be babies react positively to it. The same might be approximately translated with “tasty”. It true for ‘umami’. This could explain why foods characterizes a savoury note that is sometimes with ‘umami’ taste are so popular.” described as meaty. The Japanese scientist Ki- kunae Ikeda first described the “umami” taste Just how important “umami” is for the con- as an independent taste in 1908: He discovered sumers, is apparent after taking just a short that the human tongue does not only sense glance at traditional dishes and condiments: – as was assumed for a long time – the tastes Especially well known hereabouts are the vari- sweet, sour, salt and bitter, but also the aro- ous Asian sauces and pastes made from soy, matic “umami” note. Ikeda had observed that fish or crustaceans. They all inherently contain the intensive taste of a Japanese fish stock was glutamic acid due to their basic ingredients incomparable to the sense of taste described and have usually gone through fermentation up till then. and maturing processes that also contribute to the savoury note. However, you can also find It is above all the glutamic acid that provides the characteristic “umami” taste in numerous the typical “umami” taste. This amino acid traditional dishes in Western cooking: be occurs in all foodstuffs that are rich in proteins it protein-packed meat dishes like goulash, as well as many that have matured – typical various stocks or also a savoury lasagne that examples are meat, cheese and legumes, but naturally contains a lot of glutamate due to also mushrooms or ripe tomatoes. the minced meat, ripe tomatoes and Parmesan cheese used. In the meantime, the existence of further tastes is being researched, such as “greasy”. But Prof. Dr. rer. nat. Ursula Bordewick-Dell of the still “umami” remains a taste that significantly Department for Nutritional Science at the Uni- determines the consumers‘ preferences. versity of Applied Sciences Munster explains: “The glutamate content of meals provides a “’Umami’ does not stick out with peaks, but savoury taste perception, known as ‘umami’.
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