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"Then you judged that this is the yeast in my hand based on this?" Flipping the bag in his hand, Xu Yi just reacted, this fat man judged this thing in his hand according to the brewing technology.

"Yes, otherwise I don't have a perspective function, I don't have a magnification function, and I don't understand the microscopic examination of this yeast, where do I know this. Bragging is no different from magic, the combination of virtual and real is the king. The fat man laughed wickedly.

"That means if there is live yeast, it can be used to ferment wine? But isn't there a lot of yeast on the surface of the grapes, how can you say that yeast is added to this wine?"

There is no yeast on the cherries in this space, but there are naturally yeast on the grapes that grow naturally, so why do you have to add yeast? Isn't this taking off your pants and farting, and it takes two times?

The fat man said: "Theoretically, if you don't take into account the alcohol content obtained by fermentation, you can do this. Just like home-grown wines, most of them are fermented using yeast from the grape skin. ”

"Does this have anything to do with the alcohol content of the wine that can be made?"

"Of course, it matters, different strains of staphylococci have different tolerance to alcohol. The fat man pointed to the bag in Xu Yi's hand and said, "I don't know what kind of yeast this is, if it is the yeast of ordinary beer, it is a yeast specially cultivated according to the requirements of the beer brewing process. ”

"Why?"

"Compared to wine, beer has a low alcohol content. ”

"No, I read the 11 degrees on the label of the beer we bought yesterday, and the red wine is only 13 degrees, which doesn't seem to be much worse, right, and I also see that some wines have a lower alcohol content on them?"

"The degree on the beer is the sugar content of the wort when the beer is brewed, and the alcohol content of domestic beer is expressed by volume ratio, which is different from the degree mark of liquor, you won't regard this as the alcohol degree, right?"

Seeing Xu Yi nodding, Yan Peimin also said: "This is the sugar content, I always thought it was the alcohol content." ”

"The alcohol content of beer is actually related to the sugar content of the wort when brewing, I will first talk about how to calculate the wort concentration, let's calculate it according to ten degrees for the sake of calculation, which means that one hundred milliliters of wort contains ten grams of sugar. ”

"That's it?"

"Actually, it's a lot, and there are 100 grams of sugar in 1,000 milliliters. ”

"Third child, you can calculate how much ethanol can be converted into a hundred grams of glucose in glycolysis, and I will see if you have also returned this knowledge to the teacher. ”

"That's all?"

"Well, regardless of the tricarboxylic acid cycle, in addition to carbon dioxide and water, there is only energy left in the process. ”

"You fat man, don't you have nothing to do. ”

Xu Yi scolded with a smile, took a pen and drew on the paper, and finally reported the result, "It's about fifty-one grams." ”

"Oh yes, so you can figure out how much alcohol can actually be fermented at 10 degrees of malt. ”

"It's only five o'clock?"

"Actually, this is a theoretical value, and about 2% of the sugar is used by yeast to form bacteria, and there are almost so many sugars that are used to synthesize other products, so after 10 degrees of malt fermentation, you can probably get about 4.5 degrees of alcohol. ”

Hearing this result, Yan Peimin, who had just vomited and felt uncomfortable, crawled onto the bed and wailed: "I'll strangle, it's so low, then I'll pour this cup at the level, it's too unspeakable! 600 milliliters of a bottle of beer, if converted into medical alcohol, this is only 40 milliliters, and a bottle of beer can pour three glasses of wine, doesn't this mean that only more than 10 milliliters of medical alcohol can pour me down?"

The fat man looked at Yan Peimin as if he was mourning and being devastated, but he still didn't forget to make matters worse, "Right, if you don't say that you are completely weak, if this is converted into 60 degrees of liquor, you can't drink two dollars, just a small wine cup and you will be wasted!"

"Alas!" Yan Peimin sighed, fell on the bed with a bang, and stopped talking.

The fat man smiled, and then said: "Generally, the highest degree of beer sold in China will not exceed five degrees, and even some beer degrees are only half a degree, the fourth, let me tell you, next time we buy this, and this is a 350 ml can, you can also drink three or four cans!"

Yan Peimin heard this, raised his head, "Fatty, you didn't lie to me, is this still wine?"

"Of course I didn't lie to you, I really have this degree, let's buy this next time." ”

"It's about the same as clean water, forget it, I'll still drink the current one, economical."

"Because of the low degree of beer, the suitable yeast varieties of this selection and breeding may not have too high alcohol tolerance, but I am afraid that if it really reaches seven or eight degrees, I am afraid that it will not continue to ferment because the alcohol content is too high, and it is also necessary to consider whether the sugar content of grape juice is too high, and the yeast will die due to the hypertonic state. ”

"That's ......"

Xu Yi was a little disappointed, the sugar content of his cherries was more than 20 percent, which was really juicy, but he was afraid that the sugar content would be even higher.

If you use this thing to ferment, I'm afraid you'll only get a sweet wine with a degree similar to that of beer.

"However, there is also a process that uses syrup to replace rice and other excipients to save costs and improve the production process, which is to use more than 20 degrees of syrup with excipients to ferment, and the alcohol concentration can reach about 15 degrees, and then dilute to the required concentration, the yeast used in this process, some strains of alcohol tolerance can reach about 21 degrees, which is used to make wine. ”

"That's terrible. ”

"Yes, hehe, but the minimum degree of commercial wine must be above an octave, or it is not only allowed to be called a wine drink, not wine, even if it is to reach an octave, you know how much sugar is required from grapes?"

"I don't know, I just made a temporary decision and remembered the sake brewing in my hometown. ”

"Oh, you have your own custom of making wine in your house?"

"Yes, they all make liquor and medicine at home, most of them make rice wine, and very few make liquor. ”

"Hey, why do you like to drink rice wine there?"

"I guess the main reason for this may be that making liquor is too expensive, and it has to be distilled, which is too cumbersome, so there are few people who brew it, after all, if you brew it yourself, the rate of this liquor is not high, and it is not as cost-effective as buying liquor yourself. ”

The fat man nodded, "It's possible." ”

"Actually, it's very simple, if you calculate it by one kilogram, white wine needs about seventeen grams of sugar, and red wine consumes a little more, about eighteen degrees of sugar, so you can calculate it. ”

"It's not too demanding, it's just over a hundred grams of sugar. ”

"Do you know how high the sugar content of grapes is?"

Xu Yi shook his head, "I don't know." ”

"The grapes sold in the market have a sugar content of between 8 and 10 percent, which is not the minimum required standard, and is not suitable for making wine at all. ”

"As I said earlier, in fact, the calculation shows that the alcohol content obtained in this way is only four or five degrees, which is not a wine at all, but most people make it at home, and they only think that it has the taste of wine and the aroma of grapes, so they regard this as wine.

"And how do you make the wine in the market?"

"In fact, there are many kinds of grapes, but they are basically divided into two categories, one is just said, the edible grapes sold on the market, the sugar content of this thing is not high, but the amount of fruit acid is lower, so it tastes sweet; ”

Xu Yi calculated in his heart, and then said: "Then there must not be half a catty of sugar in one kilogram of sugar content of this grape, how sweet does this have to be! But listen to what you mean, there is no such sweet grape on the market at all, why?"

The fat man shook his head and said, "Contrary to what you think, most varieties of wine grapes are only the size of a finger cap, and they are black and not garbage. In fact, the most important thing is that the taste of this wine grape is sour and astringent, the skin is very thick, and there are basically seeds in it, how can this thing be delicious, no one will buy it if it is really taken out!"

"Isn't that high in sugar, how can it not be sweet?"

"Acids have a strong effect on taste, acting on taste in both molecular and ionic states, and acids are irritating and corrosive. ”

After all, as long as the sugar-acid ratio of these table grapes is high enough, they don't need too high a sugar content, while wine grapes need to have a fairly high sugar content."

"There is an old saying that when you are hungry, eating sugar is as sweet as honey, and eating honey is not sweet when you are full, in fact, scientific analysis, fructose has the highest sweetness in natural sugars, nearly twice that of sucrose, and the fructose content in honey is very high, so it gives people the feeling that honey is sweeter than sugar, but people have too many individual differences in sweetness. It's just that no matter what kind of person, the sensitivity to sour taste is higher than the sensitivity to sweetness, and the concentration of ordinary vinegar is only how much, and many people can't stand it, so when this wine grape eats in the mouth, people's first feeling is sour, and they can't eat any sweet feeling at all, and the glucose content in the grape is still the majority, and the sweetness of this thing is only 70% of sucrose, so it doesn't feel sweet. ”

"Third child, do you know why you need grapes with high acidity to make wine?"

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