May have a certain auxiliary effect, but smoked vinegar is not possible to eliminate all harmful bacteria.
One, make the culture medium smoked vinegar sampling
Pour a pot of vinegar, put on the fire slowly simmering, so that the sour taste lingers in every corner of the house. Every cold and flu season, many people will do this. Because there is such a saying: smoked vinegar can sterilize. This statement is reliable? Recently, the Luoyang Evening News reporter came to Luoyang Normal College School of Life Sciences, asked the hospital associate professor Yi Li led her students to unveil the truth.
Two, the experiment: home smoked vinegar can not be sterilized, to see the experimental analysis
(a) experimental tools
cooking vinegar
Iron pot
Induction cooker
Culture medium: in common parlance, is the bacterial food, it is used to cultivate the bacteria
Culture Petri Dish: a transparent glass disk, used to hold the culture medium
Ultra-clean bench: a semi-enclosed space sterilized by ultraviolet light, in which many experimental steps need to be completed to ensure that the experimental supplies are not contaminated by bacteria
Constant-temperature incubator: equipment used to cultivate bacteria, you can set the temperature
Alcohol lamps: experiments can be sterilized with it
(ii) experimental steps
Put the Petri dish in the Constant temperature incubator left three are the results of the experiment after fumigation vinegar, the right side is the results of the experiment without fumigation vinegar
Step one: make the medium
Weigh the appropriate amount of peptone (dòng), beef paste and other nutrients, and then mix it with agar to make a solid medium.
Step 2: Apply the medium
Take six sterilized and dry petri dishes and apply the medium to them near a burning alcohol lamp in an ultra-clean bench.
Step 3: Smoke the vinegar
Pour two bags of cooking vinegar into an iron skillet and turn on the induction cooker to allow the vinegar to evaporate. Because the space during the experiment was too large, the pot in which the vinegar was cooked was placed in a semi-enclosed space with an area of about 5 square meters in order to ensure the effectiveness of the experiment.
Step 4: Collect airborne bacteria samples
The six petri dishes with culture medium were divided into a group of three each, one group was placed in the room without vinegar, and one group was placed in the semi-enclosed space with vinegar, so that the airborne bacteria fell into the petri dishes along with the dust in the air.
Step 5: Seal the petri dishes and put them into a constant temperature incubator
After 30 minutes, seal the six petri dishes with the lids and put them into a constant temperature incubator, with the temperature set to 37 degrees Celsius.
Step 6: Count the total number of colonies
After 48 hours of incubation, remove the 6 petri dishes from the incubator and count the total number of colonies in each dish.
(C) Experimental results
The average number of colonies in the air sample without vinegar: 65
The average number of colonies in the Petri dish No. 1: 51
The average number of colonies in the Petri dish No. 2: 77
The average number of colonies in the Petri dish No. 3: 67
The average number of colonies in the air sample half an hour after vinegar was smoked: about 34< /p>
Total number of colonies in Petri dish No. 1: 37
Total number of colonies in Petri dish No. 2: 28
Total number of colonies in Petri dish No. 3: 38
(A colony is defined as a growth that can be recognized by the naked eye as it grows and reproduces on a solid culture medium.)
(D) Analysis of the results
The following analysis was given by Yi Li for this result:
In the experiment, fuming vinegar had a bactericidal effect because of the high concentration of acetic acid in the air
From the data, fuming vinegar had a certain effect on killing bacteria in the air, which was due to the fact that the space for the experiment was very small, and the concentration of acetic acid in the air was very high, so the bactericidal effect was more obvious.
Smoking vinegar at home can't achieve the experimental effect
When smoking vinegar at home, the acetic acid concentration in the air is much lower than the acetic acid concentration in the experiment due to the space is several times larger than the space in the experiment, so the public may not be able to play a bactericidal effect of smoking vinegar at home.
(E) professionals remind
Doctors: high concentration of acetic acid in the air may burn the respiratory mucosa
City women and children's health care center of the new hospital pediatrics, pediatrics ward chief physician Wang Li, respiratory physician attached to the Luoyang Central Hospital of Zhengzhou University, Zan Guoxin suggests that
Citizens are best not to smoked vinegar at home. Because although acetic acid has a bactericidal effect, but the premise is that acetic acid to reach a certain concentration, the concentration of acetic acid in cooking vinegar was not high, so its bactericidal effect is not good, and smoked vinegar at home not only can not play a bactericidal effect, but also may trigger respiratory diseases. Human respiratory mucosa is very fragile, especially children, the respiratory mucosa is more delicate, acetic acid volatilization in the air, will enter the respiratory tract, so that the respiratory mucosa dry, itchy and other uncomfortable symptoms, acetic acid concentration is too high there may be burned mucosa of the respiratory tract, it is easier to cause respiratory diseases.
(F) the benefits of vinegar
Shanxi is known to be the hometown of old vinegar, Shanxi's vinegar enterprises are many, known as the famous enterprises are Taiyuan Yiyuanqing Vinegar Factory, Qingxu Old Vinegar Factory, Taiyuan White Pagoda Vinegar Factory and so on. The employees of these enterprises seldom suffer from cold all year round, and there are no patients with cancer. Some people have consulted the experts and asked why the custom in Shanxi is to brew a jar of vinegar after the birth of a daughter, so that the daughter will be married off as a dowry, is it possible that this jar of vinegar has no shelf life? The vinegar will not go bad? The expert's answer is "because it is too acidic, bacteria can not survive." And now Shanxi people to the hotel dining, in order to ensure that the tableware is sterile, will be in the service staff set on the plate, pour some vinegar to shabu shabu plate to achieve the purpose of disinfection.