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"Yeast - types, use, bookmark, choice" the following brief information on yeast has been collected:
- Types of yeast,
- External evaluation of fresh compressed yeast,
- Tips for using yeast,
- What is important to know about yeast,
- The amount of yeast added to baked goods,
- What determines the choice of the amount of yeast,
Converting dry yeast into wet (fresh, pressed)1. For 100 grams of wheat flour, 2 grams of fresh yeast is required for a simple bread dough. A simple dough means the presence in the dough of flour, water, salt, sugar, butter, yeast and a small amount of baking (butter, egg, milk, etc.).
2. If the dough contains rye, whole grain flour, and other flour mix, per 100 grams of the total weight of flour, 2-2.5 grams of fresh yeast is required - the more flour the mix is compared to wheat, the more flour is required.
3. For 100 grams of wheat flour, 2.5 grams of fresh yeast for butter bread. Butter dough contains a high content of sugar, eggs, butter, milk and other ingredients.
Yeast weight: 1. 1 scoop of a bread maker contains 3-4 grams of dry yeast.
2.
The amount of yeast is approximately:150 grams of wheat flour requires 0.5 tsp. dry yeast, or 1.5-2 grams
300 grams of wheat flour requires 1 tsp. dry yeast, or 3-4 grams
450 grams of wheat flour requires 1.5 tsp. dry yeast, or 6-8 grams
600 grams of wheat flour requires 1.5-1.8 tsp. dry yeast, or 6-7 grams
Yeast R and B and their laying in the doughYeast R and B are often mentioned in bread baking recipes from the instructions for bread makers. What is this yeast?
This is the same yeast that you are used to using to bake your bread.
The only difference is in the dosage of yeast when baking bread for different programs.
1. Amount of yeast
B intended for baking bread
Basic (basic) cycle (program) BREAD.
2. Amount of yeast
R intended for baking bread
accelerated cycle (program) BREAD RAPID.
Good bread to you!
yeast in general and yeast in particularMaterial provided by the site
🔗, for which I express my gratitude to the Author!
When is it better to add yeast to the mass If the TU to the recipe does not say otherwise, then it is still better to introduce yeast 5 minutes before the end of the batch. When introduced at the beginning of the batch, the yeast will start its work immediately, which means it wasted. In addition, premature fermentation will increase the temperature and strength of the mass. And in hot weather or in countries with a humid climate, this will lead to especially negative consequences.
We know that in the course of its activity, yeast absorbs oxygen and enzymatic sugar contained in flour in an amount of 1 ... 2%. Yeast without oxygen can somehow work, but without sugar - they refuse. If the beginning of fermentation was premature, it means that the nutrition for the yeast will end earlier than the calculated one and the fermentation will stop, so undesirable and offensive for the baker.
If we want to get a well and properly fermented bread piece, it is necessary to delay the onset of the yeast action and put them in such conditions so that they begin to ferment as late as possible (at the end of the batch) and they would have enough strength to continue their work until the first minutes of baking.
How yeast works with temperatureThis is how yeast behaves approximately at the temperature of the mass:
-4 / -2C they do not and cannot have any fermentation activity;
+ 2 / + 4С weak movement is outlined, in the sense of fermentation;
+ 26 / + 28C optimum temperature for optimal yeast activity;
+ 38 / + 42С weak activity;
+ 50 / + 55C no activity, yeast dies.
Do not confuse stock temperature with room temperature. In some countries, the temperature in the fermentation chamber during fermentation is mind-bogglingly high, due to the peculiarities of the local (or national?) Technological process. So if in France this temperature is on average between +30 ... 35 ° C, in the USA it is already + 48 ° C, in Great Britain + 55 ° C. By the way, there hamburger buns are fermented at + 75 ° C and 95% humidity.The temperature of the room also changes at different times of the year. In order to bring the fermentation parameters to a single denominator at any time of the year, with an arithmetic average formula of 15 grams of yeast per 1000 grams of flour, the dosage must be varied. So in summer it can be only 1%, and in winter - 2.5 ... 3%. True, if the temperature in the room is high and high humidity in winter, the fermentation rate will still greatly increase. To fix this, the yeast dose will have to be reduced.
The yeast counting at different times of the year should be done even if the dough ferments in special fermentation chambers with the same temperature and humidity, since the dough enters these chambers in a different initial fermentation state in summer or winter.
The ideal fermentation temperature depends on many reasons. As a rule, it is +26 ... 28C.Do not forget that the temperature of the mass also affects the rate of fermentation - the higher it is, the faster it is.
At normal room temperature, a dose of yeast exceeding 2% in relation to flour will provoke rapid and strong fermentation, and even in a short time. As a result, the bread will turn out to be completely or almost tasteless, and it will also be poorly stored. It will usually have a high volume, thin, fragile and self-crumbling, pale rind.
(Paradoxically, such bread will also find admirers because of its extra volume).A large dose of yeast, or too much, spoils bread in every way. First of all, this affects the taste, color and shape of the bread.
Taste... The shortened fermentation time prevents the accumulation of the necessary amount of organic acids responsible for the taste and smell of bread. Therefore, it will turn out tasteless and without any aroma.
Colour... Pale (and thick crust!). The beautiful color of the bread crust is the result of caramelization of the sugar in the dough during baking. An excess amount of yeast will be the reason for the complete consumption of this very sugar even before baking, i.e. during fermentation and proofing.
The form... Over-speeding fermentation will provoke a cadena of unwanted reactions and damage the gluten's ability to stretch. In order not to work with poorly forming or frankly torn dough, you will have to completely or partially abandon the preliminary proofing, and we will do the kneading + cutting + molding as quickly as possible, just to have time to form the workpiece. The mass will not really mature, which means it will not gain strength.
A few more details of this bread drama:
- formed pieces will tend to shrink during proofing;
- in the first minutes of baking, the growth of bread will be brutal, which will provoke explosions-ruptures at the cuts or on the sides;
- in the last minutes of baking, such bread will "shrink" and lose volume.
To strengthen the gluten and help the mass go through all the forming processes without any problems, you will have to use flour with increased elasticity. Due to the obligatory use of such flour, bread in the last minutes of baking will inevitably shrink and lose part of its volume obtained in the first minutes of baking.
To correct this annoying defect, the blanks will have to be given an incomplete (shortened in time) proofing and, thus, initially start baking the undersized.
Rational dose of yeastThis is an average between 1 and 1.5% in relation to flour. Allows to produce bread with a reasonable fermentation time from 3 to 4 hours. With "no overdose" of yeast, the quality of the bread improves, because the kneading is reduced, the fermentation time increases, gluten develops well, the required amount of organic acids accumulates in the dough.
In addition, the correctly selected temperature of the mass and the room for proofing significantly increases its elasticity (read - it will be possible to form workpieces without effort and causing bodily harm to them).
As a result, the bread will turn out to be appetizing, light, justified, but not extremely large, with a slightly moist crumb, a beautiful, crispy and exquisitely tasty crust.
Yeast, fat, sugar, salt and fermentation rateWhen adding more than 50 grams of fat per 1000 grams of flour to the mass, the fermentation rate is noticeably reduced.
When adding no more than 50 grams of sugar per 1000 grams of flour to the mass, the fermentation rate increases. In large doses (this is 100 grams or more per 1000 grams of flour), sugar slows down fermentation.
If more than 15 grams of salt per 1000 grams of flour is added to the dough, fermentation slows down.
To maintain the usual time frame, provided that you need it, the amount of yeast can naturally be increased by slowing down fermentation.
Yeast qualityFirst, we evaluate the product by its appearance and first of all pay attention to the color and smell.
Colour... Good unspoiled yeast has a more creamy color, sometimes marfil, uniform without spots, a grayish tint is allowed. In the good old (and not so) days, when the quality of the pressed yeast left much to be desired, a change in color towards darkening indicated clearly that the product was irretrievably lost. Today - only that he has aged a little, but has not yet lost his fermentative power and does not pose a danger to others. The color of modern yeast is not associated with enzymatic quality. However, if the yeast not only darkened, but also turned from crumbling to smearing, such yeast is only discarded.
Smell... Peculiar to yeast. No mold odor or other foreign odors allowed.
Taste... Characteristic of this type of product i.e. almost bland, but with a slight sourness and without any foreign aftertaste.
Consistency... Dense - the yeast should crumble, not smear.
Humidity... More or less moisture does not indicate a greater or lesser enzymatic ability of yeast, but only that it contains more or less dry matter (in this case, it is not the amount of dry matter that is especially important, but their quality). The fact is that the different ratio of dry matter and moisture in different countries is determined by local specifications. So in countries where it is customary to first dissolve yeast in water, this ratio will be 26 ... 28% to 72 ... 74%, and where they are simply crushed into a mass - 30 ... 35% to 65 ... 70%.
In addition, producers prefer to reduce the dry matter content in the production of more active yeast and thus increase its moisture content.
How to determine the lifting force of yeastThere are several ways to determine the lifting force of yeast, however, as well as spontaneous fermentation starter cultures. The simplest one is "Accelerated".
A porcelain cup is placed in a container with tap water, 0.31 g of baker's yeast and 4.8 ml of sodium chloride solution are placed in the cup. Everything is thoroughly mixed until a homogeneous mass is obtained. Then add 7 g of wheat flour, "knead" the dough and give it a spherical shape.
(Previously, as they say for the purity of the experiment, water, a cup, flour and a solution of sodium chloride with a mass fraction of 2.5% must be heated for 2 hours at a temperature of + 35C).
Then the resulting dough is dipped into a cylindrical container with tap water heated to a temperature of + 35C, after which the container is kept for some time at the same temperature until the ball floats.
The "lifting force of the yeast" will be equal to the period of time in minutes elapsed from the moment the dough is dropped into the container until it rises, multiplied by a factor of 3.5.
Storage- strictly control the expiration date of the yeast indicated on the package, and do not stock up on more yeast than you will need in the near future;
- if possible, avoid freezing compressed yeast;
- do not store salt and yeast nearby;
- at a temperature of + 1C, the shelf life of yeast increases by 14 days, and if they are frozen, then up to 3 months (however, in this case, they will lose almost half of their fermentation activity);
- it is best to store yeast wrapped in paper and then very tightly in cellophane in order to maintain the moisture balance and prevent unwanted mold contamination from the outside;
- temperature plays a major role in the long-term storage of yeast. In summer, at high temperatures, they can easily overheat, which will lead to the autolisis effect, as a result of which the temperature of the cells will increase, the protease enzymes contained in them will begin to destroy the structure of proteins and ultimately lead to gradual cell death. Autolisis appears gradually - at first the yeast stops crumbling and can only "smear", then it starts to smell strong and very unpleasant. Such yeast is irretrievably spoiled, it is strictly forbidden to use it.
- yeast is not used if it has lost some of its fermentation capabilities or absorbed other odors during storage, because, firstly, it will be difficult to control the fermentation process itself and, secondly, this will negatively affect the taste and smell of baked bread.
- if yeast is stored at a temperature close to the optimum fermentation temperature (+26 ... 28C), then, being a living organism, it will lead an active plant life, wasting its nutrient reserves in vain, and thereby reducing its production potential.
A little bit more- good, i.e. unspoiled yeast should dissolve perfectly in water, forming a homogeneous suspension, while the ratio of yeast to water can be 1: 3 or 1: 4, and the temperature of the same water should not rise above + 40C;
- you can introduce yeast at the beginning or at the end of the batch, depending on how much strength we want to get. At the same dosage, the yeast introduced at the beginning of the batch will give the mass more strength than the same amount, but at the end of the batch;
- before adding to the mass, the compressed yeast is dissolved in water or crumbled;
- it is known that yeast works better if it is first diluted in warm water (not higher than + 35C), and then mixed with the rest of the water. Yeast dissolved in water will work 17% more productively in comparison with the same amount of yeast, only introduced into the mass in the form of crumbs;
- If hot water is used according to TU, then it must be done so carefully that it does not come into direct contact with the yeast. Remember that yeast dies at + 55 ° C;
- when adding yeast in the form of crumbs, it is still necessary to add a small amount of water afterwards;
- If we are in doubt whether yeast has been added or not, we can take a piece of dough and throw it into a container with hot water. "With yeast" the dough will float in 5 minutes, otherwise the missing yeast will have to be added after kneading (this is not very good, but as they say, not fatal);
- good yeast produces not only active, but also uniform fermentation throughout the mass;
- if the yeast according to the recipe is more than 20 grams per 1000 grams of flour, it is better to introduce them at the end of the batch;
- if you use instant yeast, remember that in comparison with pressed yeast, the beginning of fermentation will be weaker, which means that the mass before molding will not gain the necessary strength and therefore the fermentation time will have to be increased.
Instead of a conclusionUnfortunately, yeast is still not very familiar to those who use it, and it is quite obvious that it is undervalued - after all, it is an everyday product, well-mastered and very rarely causes problems. At the same time, they forget that the yeast industry is based on serious research in the field of biotechnology and cell engineering and it produces its own product - yeast with a Quality Certificate in accordance with international standards ISO 9002
I would not freeze yeast
Even in 6 ... 12 weeks of the "Siberian Sharman" up to 40 ... 50% of the "yeast" dies! In addition, during freezing, yeast cells are partially damaged, lose their viability, some of them die off, and this reduces the elastic properties and gas-holding capacity of the dough. Dead yeast cells impair the cohesion of the gluten. The result is that the dough becomes sticky and stretchy.
Freezing of yeast can be slow, fast at temperatures down to -24 ° C or deep in nitrogen at -195 ° C. Store such yeast at temperatures from -8 ° C to -25 ° C.The longer the shelf life, the lower the temperature should be.
For freezing, select stable yeast. Stability is influenced by many factors, including the strain, its resistance to low temperatures and the freshness of the yeast. It is recommended to freeze yeast that does not have a very high fermentation activity (so-called compressed yeast with medium gas formation rate). Such yeast should contain at least 30% dry matter, protein content - at least 55% on dry matter, lifting force not more than 65 minutes. Special frost-resistant baking pressed yeast is best suited for freezing.
To increase the protection of yeast, they are sometimes treated with glycerin, sunflower oil or egg yolk (I'm not talking about linoleic or oleic acid and phosphate concentrate).
Of the yeast brands I know, Lesaffre yeast is best suited for freezing.