Views: 11 Author: Site Editor Publish Time: 2020-07-09 Origin: Site
When cultivating yeasts, what is the purpose of ventilating or oscillating the culture device?
Keep oxygen adequate. Yeasts are facultative anaerobic bacteria. Hypoxia can cause a large number of yeast deaths.
The purpose of shaking is to make the bacterial cells fully contact and flow with the culture fluid, and it will not affect the further reproduction of the bacterial cells because of excessive consumption of local nutrients or too much waste. Therefore, if it is not shaken, the yeast will also multiply, but the speed of reproduction is far faster than the case of shaking.
Conditions for cultivating yeast are:
Yeast, like other living organisms, needs similar nutrients. Like bacteria, it has a set of intracellular and extracellular enzyme systems to break down macromolecular substances into small molecular substances that are easy for cell metabolism to use. They belong to heterotrophic organisms.
Yeast can grow in the range of PH value from 3.0 to 7.5, and the optimal pH value is 4.5 to 5.0.
Like bacteria, yeast must have water to survive, but yeast requires less water than bacteria, and some yeast can grow in environments with very little water, such as honey and jam, which shows that they are quite resistant to osmotic pressure Acceptability.
At temperatures below the freezing point of water or above 47°C, yeast cells generally cannot grow, and the optimal growth temperature is generally between 20 and 30°C.
Shaking can make the culture medium fully contact with oxygen and increase the supply of dissolved oxygen. So shaking culture make yeast grow faster. Zhichu provides precise temperature control, precise control speed, and strong stability of the shaking incubator.
Method: When shaking the liquid, generally shake it at 30 degrees for 24-30min, and solid culture generally takes 3 to 5 days at 30 degrees.
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