Method for rapidly determining number of bacterial in lactic acid bacillus subtilis production liquid culture

A Bacillus subtilis, liquid culture technology, applied in the biological field, can solve the problems such as the number of bacteria cannot be determined, and achieve the effects of shortening the detection time, accurate results, and easy operation

Inactive Publication Date: 2013-01-02
CHONGQING ACAD OF ANIMAL SCI
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  • Abstract
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Problems solved by technology

However, the optical density or transmittance is not only affected by the concentration of bacteria, but also affected by factors such as cell size, shape, culture medium composition, and the wavelength of light used, and usually only detects suspensions containing a large number of bacteria. The relative number of bacteria can not be determined by this method for samples or tissue samples that are too dark in color, but this method is simple and quick
The main key to the determination of the number of bacteria by turbidimetry is how to eliminate the interference in the sample, the determination of the wavelength of the light wave used and the corresponding relationship between the measured OD value and the number of bacteria, otherwise only the relative number of bacteria can be judged but not determined accurate count of bacteria

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] The sample is lactic acid-producing Bacillus subtilis CSY1-3-10-1 strain, which is fermented with 10% fructo-oligosaccharide synthesis medium at 35-40° C. for 24 hours, and the number of bacteria contained in the lactic acid-producing Bacillus subtilis in the fermentation liquid is detected. Take 1ml of fermentation broth as a sample.

[0018] Method 1 counter counting method

[0019] Take the above samples and count them with a hemocytometer. Take 1ml of the sample, place it in the counting chamber of the hemocytometer, and three technicians count three times with a microscope to reduce the possibility of subjective errors. The number of bacteria containing lactic acid-producing Bacillus subtilis in each milliliter of this fermented liquid is 2.2799×10 10 CFU / ml, about 22.8 billion.

[0020] Method 2

[0021] The above samples were taken for centrifugation. For the above samples, two centrifugation conditions were set respectively. Condition 1 was: after centrifug...

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Abstract

The invention belongs to the field of biology, and especially relates to a bacteria counting method, particularly to a method for rapidly determining the number of bacteria in a lactic acid bacillus subtilis production liquid culture. The method comprises the following concrete steps: taking a sample and washing, diluting the washed sample by using a diluent until an OD600 value is not greater than 0.8, and recording a dilution multiple, wherein the total number of the bacteria meets the following formula that: the total number of the bacteria=OD600 value*dilution multiple*2.2*10<9>CFU/mL. According to the present invention, automatic detection and counting by using instrument are achieved; the traditional bacterial culture counting adopts manual operation, such that reliability is substantially affected by experience of a testing person, and the automatic instrument detection shows advance of the detection method; the method of the present invention is simple and rapid; and a corresponding relationship among the light wave wavelength adopted for detection, the determined OD value, and the number of the produced lactic acid bacillus subtilis is determined, and the result is accurate.

Description

technical field [0001] The invention belongs to the field of biology, and in particular relates to a technical method of bacteria. Background technique [0002] With the rapid development of the national economy and the improvement of people's living standards, people have put forward higher and newer requirements for the breeding environment and safe and healthy animal products. In recent years, animal food safety incidents that have been exposed frequently, such as the "lean meat powder incident" and "melamine milk incident", have all dealt a heavy blow to the animal breeding industry and caused a serious crisis of trust. As the world's largest animal breeding country, China's export of animal products plays an important role in the national economy. However, in recent years, some countries such as Europe and Japan have used food safety issues as barriers to refuse the entry of some animal products from my country, which has caused undue damage to our economy. loss. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 付利芝刘作华黄勇杨金龙郑华杨睿沈克飞张素辉
Owner CHONGQING ACAD OF ANIMAL SCI
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