The high school biology experiment teaching not only requires the operability of the experiment, but also pays more attention to the fun and safety of the experimental content. The fruit wine vinegar making experiment has naturally become one of the most anticipated experiments in the minds of teachers and students. The routine experiment teaching is to let students use ordinary plastic bottles or mineral water bottles to carry out experiments. Although the materials are convenient, the safety of the experimental equipment cannot be guaranteed. In addition, the simple operation can not let the students understand the true principle of the experiment, so if they continue to use This type of teaching will not be conducive to the improvement of students' abilities. The fruit wine vinegar fermentation device makes up for the shortcomings of the traditional experimental methods, so that students can experience the fun and satisfaction of the experiment while learning the high school biological knowledge.
Fruit wine vinegar fermentation device advantages show:
Fruit wine vinegar fermentation device pk mineral water bottle
1. Made of food grade materials 1. Ordinary plastic
2. No need to manually deflate 2. Need to manually deflate regularly
3. Verify CO2 generation 3. Unable to verify
Fruit wine vinegar fermentation device use process:
Fruit wine making:
1. Treatment of the test material: Wash 500g of grapes, crush them into grape juice with a juicer, and put them into the fruit wine vinegar fermentation device.
2. Preparation of yeast solution: Weigh 25g of yeast powder solution and 250ml of sterile water.
3. Add 3 ml of tap water to the water-sealed tube, and add a drop of phenol red indicator to the bottle cap.
4. Fermentation was carried out at room temperature (18-25 ° C) until no bubbles were generated, and the number of bubbles (units/min) was recorded at intervals to calculate the fermentation rate.
5. After the end of the fermentation, the suspended matter in the upper part of the bottle is removed, and the result is a fruit wine.
Fruit vinegar production:
1. Disinfect the fermentation device with alcohol, fill the bottle with 500ml of fruit wine, add 10ml of vinegar solution, and mix well.
2. Attach the attached long silicone tube to the lower end of the stainless steel tube, unplug the water seal tube, connect the air pump, and close the bottle cap.
3. After a week of aeration and fermentation in a 35-40 ° C environment, the fruit vinegar can be obtained by filtration.
Xiaolan answers your questions:
1.Q: The fruit wine vinegar fermentation device is made of food grade materials. What kind of material is it?
A: Food grade material refers to the fruit wine vinegar that can be directly consumed, which will not cause any damage to the student's body, and the material is resistant to corrosion and does not react with fruit wine or fruit vinegar.
2.Q: Why is the cap tightening degree different when making fruit wine and fruit vinegar?
A: Fruit wine production relies on yeast to perform anaerobic respiration, and the acetic acid bacillus for making fruit vinegar is subjected to aerobic respiration. Therefore, the bottle cap must be tightened when making the fruit wine, and the bottle cap made of fruit vinegar does not need to be tightened.
3.Q: How is the vinegar solution configured?
A: Super simple, weigh 2g vinegar, dissolve in 10ml of sterile water for a while, filter with gauze to get vinegar solution.
Chuan Bran Biological Official WeChat
Chuan Bran Biotechnology Department official WeChat
The first brand of Beijing Chuan Bran Bio-Secondary Biology Lab's overall solution, 14 years of focus on high school biotechnology laboratory, high school tissue training laboratory, E testing laboratory, innovation laboratory, biological garden and other new curriculum laboratory Design, construction, instrument configuration, training and supply of reagent supplies have been recognized by many prestigious schools. 7*24 hours national free customer service hotline, Chuan Bran official website:. Looking forward to your attention! The whole process of service experiment is worry-free. Chuan Bran is always your friend!
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