Method for producing heat-resistant superoxide dismutase (SOD) by using myceliophthora thermophila

A thermophilic myceliophthora and superoxide technology, applied in the field of bioengineering, can solve the problems of cumbersome extraction process, poor thermal stability of natural SOD, easy to be deactivated by heat, etc. heat labile effect

Inactive Publication Date: 2015-06-10
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to current reports, SOD can be produced by microbial fermentation, but mainly intracellular enzymes (Diao Zhimin, Yao Yinxia, ​​Zhang Wenjing. Research on yeast SOD fermentation conditions [J]. Journal of Qinghai Normal University (Natural Science Edition), 2002,4 :48-51; Yang Mingyan, Guo Ailian, Shen Jian, et al. Mutation breeding and fermentation conditions of high-yield SOD yeast [J]. Food Science, 2005,26(10):147-150), the extraction process is relatively cumbersome
[0003] Natural SOD has poor thermal stability and is easily deactivated by heat during processing and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Inoculate the slant strains into a 250ml Erlenmeyer flask containing 50ml of culture medium. The culture medium consists of: glucose 20g / l, beef extract 10g / l, peptone 10g / l, NH 4 NO 3 10g / l, corn syrup powder 12g / l, pH natural. 45°C, ferment for 72 hours. After the fermentation is over, 50 ml of the fermentation broth is centrifuged at 10,000 rpm to remove bacteria. The supernatant crude enzyme solution was used to determine the pH and temperature parameters of the enzyme. Take 0.5ml of supernatant crude enzyme solution, place them in 3.5ml of citric acid-phosphate buffer solution with pH 4, 5, 6, 7, and 8 respectively, and measure the SOD activity at 45°C as 800, 1200, 2000, 1600, 1000U / mL. Therefore, the optimal reaction pH of this SOD is 6. Take 0.5ml of the supernatant crude enzyme solution and mix it with 3.5ml of pH 6 citric acid-phosphate buffer solution. The enzyme activities measured at 25, 35, 45, 55, and 65°C are 400, 800, 2000, and 1500 respectively. ...

Embodiment 2

[0017] Inoculate the slant strain into a 250ml Erlenmeyer flask with 50ml of seed medium, the composition of the seed medium is: glucose 20g / l, beef extract 10g / l, peptone 10g / l, NH 4 NO 3 10g / l, corn syrup powder 12g / l, natural pH, sterilized at 121 for 20min, shaker at 150rpm, cultured at 45°C for 48 hours. This process has 10 identical Erlenmeyer flasks, obtains 500ml seed liquid altogether.

[0018] Inoculate 500ml of seed solution into a 50L fermenter, and the composition of the fermentation medium is: glucose 20g / l, beef extract 10g / l, peptone 3g / l, NH 4 NO 3 10g / l, corn syrup powder 6g / l, natural pH, fermentation temperature 45°C, liquid volume 70%, ventilation volume 1:1.5v / v / m. The fermentation time is 3 days. Under this condition, the final SOD activity in the fermentation broth was 1300U / ml.

Embodiment 3

[0020] Inoculate 1L of the cultivated seed solution into a 10L fermenter. The composition of seeds and fermentation medium are: fructose 30g / l, beef extract 10g / l, corn syrup powder 20g / l, K 2 HPO 4 4g / l, MgSO 4 7H 2 0.5g / l, pH natural. The fermentation temperature is 20°C, the liquid volume is 70%, the ventilation volume is 1:0.3v / v / m, and the fermentation time is 5 days. Under these conditions, the final SOD activity in the fermentation broth is 2000U / ml.

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Abstract

The invention relates to a method for producing superoxide dismutase (SOD) by using myceliophthora thermophila and belongs to the technical field of bioengineering. According to the method, SOD is produced from myceliophthora thermophila under the condition of liquid-state fermentation and is an ectoenzyme. The yield of heat-resistant SOD can reach 2000U/ml to the maximum, so that the method has a good industrial application prospect.

Description

technical field [0001] The production of superoxide dismutase (SOD) by using myceliophthora thermophila belongs to the technical field of bioengineering. The invention relates to obtaining high-temperature-resistant SOD through liquid state fermentation by utilizing strain Myceliophthora thermophila whose preservation number is ATCC 42464. Background technique [0002] Superoxide dismutase (SOD) has a good defense against oxygen toxicity and can enhance the body's ability to resist radiation damage. In recent years, it has become a new anti-inflammatory drug for the treatment of inflammation, tumors and autoimmune diseases; an additive for sunscreen, anti-aging and anti-inflammatory in the cosmetic and food industries, and a biochemical reagent for certain disease probes. SOD widely exists in animals, plants, all aerobic microorganisms and a few anaerobic microorganisms. At present, SOD is mainly extracted from animal blood (such as pig blood or cow blood) (Yuan Ye. Prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N9/02C12R1/645
CPCC12N9/0089C12Y115/01001
Inventor 丁彦蕊王雪芹牟兆琳饶榕
Owner JIANGNAN UNIV
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