It may have a certain auxiliary effect, but it is impossible for smoked vinegar to eliminate all harmful bacteria.
1. Preparation of medium smoked vinegar sampling
Pour a pot of vinegar and put it on the fire to simmer slowly, letting the sour smell linger in every corner of the home. During the cold season, many people do this. Because there is a saying: smoked vinegar can kill bacteria. Is this statement reliable? Recently, a reporter from the "Luoyang Evening News" came to the School of Life Sciences of Luoyang Normal University and asked Yi Li, an associate professor of the school, to lead her students to reveal the truth.
2. Experiment: Can vinegar be smoked at home to kill bacteria? Let’s take a look at the experimental analysis
(1) Experimental tools
Edible vinegar
Iron pot
Induction cooker
Medium: In layman’s terms, it is food for bacteria and is used to cultivate bacteria
Petri dish: a transparent glass disc , used to hold culture media
Ultra-clean workbench: a semi-enclosed space that has been disinfected by ultraviolet rays. Many experimental steps need to be completed in it to ensure that experimental supplies are not contaminated by bacteria
Constant temperature Incubator: equipment used to cultivate bacteria, the temperature can be set
Alcohol lamp: it can be used for disinfection during experiments
(2) Experimental steps
Cultivation Put the dishes into the constant temperature incubator. The three on the left are the experimental results after fumigating with vinegar, and the right side are the experimental results without vinegar.
Step 1: Make the culture medium
Weigh Appropriate amounts of peptone, beef extract and other nutrients are then mixed evenly with agar to make a solid culture medium.
Step 2: Apply the culture medium
Take 6 sterilized and dry petri dishes and apply the culture medium into the culture dishes near the burning alcohol lamp in the ultra-clean workbench .
Step 3: Smoking vinegar
Pour two bags of edible vinegar into the iron pot, then turn on the induction cooker and let the vinegar evaporate. Since the space during the experiment was too large, in order to ensure the experimental effect, the vinegar boiling pot was placed in a semi-enclosed space with an area of ??about 5 square meters.
Step 4: Collect bacterial samples in the air
Divide 6 petri dishes containing culture medium into groups of 3, and place one group in a place without vinegar In the room, one group was placed in a semi-enclosed space filled with vinegar, allowing the bacteria in the air to fall into the petri dish along with the dust in the air.
Step 5: Seal the Petri dishes and place them in the constant-temperature incubator
After 30 minutes, cover the 6 Petri dishes with their lids, seal them, and place them in the constant-temperature incubator. , the temperature is set to 37℃.
Step 6: Count the total number of bacterial colonies
After 48 hours of culture, take out the 6 petri dishes from the constant temperature incubator, and then count the total number of bacterial colonies in each petri dish. .
(3) Experimental results
The average number of bacterial colonies in the air sample without vinegar: 65
The total number of bacterial colonies in Petri dish No. 1: 51
The total number of colonies in Petri dish No. 2: 77
The total number of colonies in Petri dish No. 3: 67
The average number of colonies in the air sample after fumigating with vinegar for half an hour: About 34
The total number of colonies in Petri dish No. 1: 37
The total number of colonies in Petri dish No. 2: 28
The total number of colonies in Petri dish No. 3: 38
(Bacteria colonies refer to the growths formed by the growth and reproduction of bacteria on solid culture media that can be recognized by the naked eye.)
(4) Result analysis
In this regard As a result, Yi Li gave the following analysis:
In the experiment, fumigation of vinegar has a bactericidal effect because the concentration of acetic acid in the air is high
From the data, fumigation of vinegar has a bactericidal effect on the air. The bacteria in the experiment have a certain effect. This is because the experimental space is small and the concentration of acetic acid in the air is very high, so the sterilization effect is relatively obvious.
Fumigating vinegar at home cannot achieve the experimental effect
When fumigating vinegar at home, because the space is several times larger than the space during the experiment, the concentration of acetic acid in the air is much lower than that in the experiment The acetic acid concentration is low, so residents who smoke vinegar at home may not have a bactericidal effect.
(5) Professionals remind
Doctors: Too high acetic acid concentration in the air may burn the respiratory mucosa
Pediatrics No. 1, New District Hospital, Municipal Women and Children Medical Care Center Wang Li, chief physician of the district, and Zan Guoxin, chief physician of the Respiratory Department of Luoyang Central Hospital Affiliated to Zhengzhou University, suggested:
It is best for citizens not to smoke vinegar at home. Although acetic acid has a bactericidal effect, the premise is that the acetic acid must reach a certain concentration. The concentration of acetic acid in edible vinegar is not high, so its bactericidal effect is not good. Moreover, fumigating vinegar at home will not only have no bactericidal effect, but may also Cause respiratory disease. Human respiratory mucosa is very fragile, especially for children, whose respiratory mucosa is even more delicate. When acetic acid volatilizes in the air, it will enter the respiratory tract, causing dryness, itching and other uncomfortable symptoms in the respiratory mucosa. Too high acetic acid concentration may burn the respiratory mucosa. More likely to cause respiratory diseases.
(6) Benefits of vinegar
It is known that Shanxi is the hometown of mature vinegar. There are many vinegar companies in Shanxi. The known famous companies include Taiyuan Yiyuanqing Vinegar Factory and Qingqing Vinegar Factory. Xu Lao Mature Vinegar Factory, Taiyuan Baita Vinegar Factory, etc. Employees of these companies rarely catch colds throughout the year, and there are no patients with cancer. Someone once consulted experts and asked why it is a custom in Shanxi to brew a jar of vinegar after a daughter is born and use it as a dowry when the daughter gets married. Doesn’t this jar of vinegar have a shelf life? Won't this jar of vinegar go bad? The expert's answer is, "Because it is too sour, bacteria cannot survive." Therefore, when people in Shanxi now dine in restaurants, in order to ensure that the tableware is sterile, after the service staff places the plates, they pour some vinegar to rinse them. disinfection purposes.