Chapter 174 Temperature Stimulation of Taste

After seeing Lu Liang shrinking his hand, the expressions of everyone present suddenly became strange.

Finally, Ruan Shishi, who was sitting next to her, spoke. She pointed to the fruit plate on the table and asked, "Student Lu, do you know why frozen fruit is sweeter than unfrozen fruit?"

She was actually quite curious about this matter.

After learning the cause and effect of the incident, Lu Liang relaxed a little, and he thought something had happened.

So Lu Liang replied casually without thinking, "Maybe ice is sweet."

After all, I couldn’t afford popsicles when I was a kid, so when winter came, I liked to break an ice popsicle under the eaves and eat it as a popsicle. At that time, I felt that the popsicles were really sweet.

Lu Liang's answer made everyone present feel doubtful. This answer was even more ridiculous than the answer of the second best student.

"Really or not, Lao Lu, stop talking nonsense and tell me as soon as you know." Cheng Ming on the side also spoke.

Lu Liang looked at Cheng Ming. Since Cheng Ming said so, Lu Liang could only explain: "This question is very simple. First of all, you should all know what the source of sweetness in fruits is, right?"

"What is it?" Someone asked subconsciously.

Lu Liang's eyelids twitched wildly, and he looked helpless.

These people really don't even want to use their brains now.

Fortunately, Ruan Shishi still answered: "Is it fructose?"

"Yes, the source of sweetness in fruits is fructose."

Lu Liang continued: "Fructose consists of α-type and β-type fructose, which are 70% β-fructopyranose, 23% β-fructofuranose, 5% α-fructofuranose and part of α-fructofuranose. Composed of fructose.”

"Under normal circumstances, the sweetness of alpha-fructose is only 33% of beta-fructose, but as the temperature decreases, alpha-fructose will be converted into beta-fructose, so the sweetness will also increase."

"So, when you eat iced fruit, you will feel it is sweeter."

After listening to Lu Liang's explanation, everyone nodded suddenly.

Someone learned to draw inferences: "This means that as the temperature drops, the sweetness of sugar will increase."

Unfortunately, it was wrong.

Lu Liang shook his head: "Of course not, not all sugar will become sweeter in a low temperature environment."

In a 2008 article, Belitz conducted an experiment in which he compared the sweetness changes of four sugars, fructose, sucrose, glucose, and maltose, at different temperatures.

Lu Liang said: "As the temperature decreases, the sweetness of fructose will increase, while the sweetness of glucose and maltose will not change, while the sweetness of sucrose will decrease and become less sweet."

This is why warm milk tea tastes better than cold milk tea.

Because the sugar in milk tea is mainly sucrose.

"However, this is only part of the reason." Lu Liang paused and continued.

"Isn't this the whole reason?" Some people were surprised.

"Of course not the whole reason."

Alpha-type fructose accounts for only 7% of fructose. Even if all of it is converted into beta-type fructose, it is only a small part.

It's hard to feel unless you look carefully.

"Then what's the other part of the reason?" Ruan Shishi asked doubtfully.

Lu Liang said lightly: "Another part of the reason has to do with our own tongues."

“In 2000, Professors Alberto and Barry from Yale University published an article in Nature titled “Temperature Stimulation of Taste.”

"This study proves that the human tongue's perception of sweetness changes with changes in temperature."

"As the temperature drops, people perceive the sweetness of fructose more clearly. When the temperature is maintained at around 15~20°C, the tongue's perception of sweetness reaches its peak."

At this time, someone still raised the question: "Then why do I sometimes feel that iced ones are not that sweet?"

Lu Liang curled his lips and said, "Then the temperature is too low and your tongue is numb from the cold. You can't even feel it."

After Lu Liang explained it like this, everyone now completely understood what was going on.

After seeing that no one was bothering him with questions, Lu Liang took out his mobile phone again and searched for information about the Asian Lung Cancer Conference on the Internet.

This villa bombing party lasted a whole day, and all the students in the class had a great time.

Lu Liang was also very happy because the food was so good that he was full.

As it approached six o'clock in the afternoon, the party was finally over.

After the event, the group also chose to walk directly back to school.

Along the way, a group of people walked and chatted, ranging from life to gossip, and finally to future plans.

Now that they are all in their junior year, there is not much time left for them.

The next thing they have to face is the internship in their junior year. After the internship, they will prepare for their graduation thesis. After completing the thesis, they will find a job.

The big knife of time has been placed on their necks, which made the originally lax university immediately become urgent.

Some people are already preparing for the postgraduate entrance examination and have learned the first word "abandon" for the postgraduate entrance examination.

There are also people who plan to find jobs directly after graduation.

"Liu Zhe, I heard that you are planning to apply for government-funded study abroad?" Someone seemed to have heard something and asked in surprise.

Liu Zhe is the top student in Lu Liang's class who has the second most stable grades.

Hearing someone discussing it, Liu Zhe also smiled and replied: "This is true. If there is a chance, I still want to fight for it."

"Then I'm afraid you're under a lot of competitive pressure." Someone said, smacking his tongue.

After listening to this person's words, Liu Zhe's smile suddenly looked a little bitter. He glanced at Lu Liang secretly. The competitive pressure was not only great, it could crush people to death.

There were only a few places in the first place, so if there was competition, he would have no chance at all.

If it doesn't work, try to take a medical exam.

Liu Zhe thought to himself.

Perhaps in order to make himself give up, Liu Zhe hesitated for a moment, and then walked towards Lu Liang. He smiled and said: "Lu Liang, we are also juniors. Do you have any plans here?"

Faced with Liu Zhe's sudden conversation, Lu Liang felt a little surprised.

Lu Liang didn't know why. He always felt that Liu Zhe was a little hostile to him, so Lu Liang rarely had contact with Liu Zhe unless necessary.

Now Liu Zhe asked Lu Liang a little surprised.

"Plan, I don't have any plans, just go to graduate school as usual."

Now in front of Lu Liang, there is no other better way out.

When he heard this sentence, Liu Zhe was stunned for a moment, but then he was ecstatic,

If Lu Liang didn't compete with him, he would lose one of his strongest competitors, and his chances would be much greater.

But he was happy, but Liu Zhe remained calm on the surface: "Why don't you apply to study abroad, with such good results?"

"Not interested." Lu Liang waved his hand.

Studying abroad, what a joke, I think I have lived too long.

Lu Liang estimated that if he dared to study abroad, he would receive reports in China on the first day he arrived in that land of freedom.

A certain student, just after getting off the plane, was shot eight times in the back and committed suicide.