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中国中医科学院 中药资源中心,北京 100700
Received:18 July 2022,
Published Online:16 August 2022,
Published:20 November 2022
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张敏,郑媛,赵玉洋等.假单胞菌菌株ZL8发酵培养基及发酵条件的优化[J].中国实验方剂学杂志,2022,28(22):174-181.
ZHANG Min,ZHENG Yuan,ZHAO Yuyang,et al.Optimization of Culture Medium and Fermentation Condition of Pseudomonas ZL8[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(22):174-181.
张敏,郑媛,赵玉洋等.假单胞菌菌株ZL8发酵培养基及发酵条件的优化[J].中国实验方剂学杂志,2022,28(22):174-181. DOI: 10.13422/j.cnki.syfjx.20221318.
ZHANG Min,ZHENG Yuan,ZHAO Yuyang,et al.Optimization of Culture Medium and Fermentation Condition of Pseudomonas ZL8[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(22):174-181. DOI: 10.13422/j.cnki.syfjx.20221318.
目的
2
课题组前期从猪苓菌核中分离得到对丹参枯萎病等植物病原真菌具有广谱抑制作用且对植物生长有促进作用的假单胞菌菌株ZL8,该研究在此基础上对假单胞菌菌株ZL8的发酵培养基和发酵条件进行优化,以提高单位体积发酵液中菌体数量,为此菌株的开发和应用提供基础。
方法
2
测定ZL8菌株在LB培养基中的生长曲线,明确其在液体培养基中的生长规律;以ZL8菌株发酵液中活菌数、菌体干重和菌悬液
A
600
值为检测指标,对不同种类的氮源、碳源及无机盐进行单因素考察以确定最适培养基组分,并进行正交试验优化培养基配比,以筛选最优发酵培养基;对ZL8菌株的接种量、培养温度、时间和转速等4个方面进行单因素和正交试验考察以确定最优培养条件。
结果
2
假单胞菌菌株ZL8的液体发酵最佳培养基为蛋白胨15 g·L
-1
、葡萄糖7.5 g·L
-1
、氯化钾10 g·L
-1
,发酵48 h后,发酵液活菌数可达8.93×10
9
cfu·mL
-1
,为LB液体培养基的3.93倍(
P
<
0.01);最佳发酵条件为接种量3%、温度28 ℃、时间72 h、转速220 r·min
-1
,发酵液中活菌数可达6.37×10
10
cfu·mL
-1
。
结论
2
优化后的培养基配方和发酵条件相对LB培养基和初始发酵条件,不仅可有效提高单位体积中假单胞菌ZL8菌株的菌体量及延长菌株生长的稳定期,而且可降低培养基成本,为假单胞菌ZL8的高效发酵和应用提供理论基础。
Objective
2
In the previous stage,our research group isolated
Pseudomonas
ZL8 from
Polyporus umbellatus
, which has a broad-spectrum inhibitory effect on plant pathogenic fungi such as
Fusarium
oxysporum
of
Salvia miltiorrhiza
and promotes plant growth. On this basis, this study optimized the fermentation medium and conditions of
Pseudomonas
ZL8,to improve the number of bacteria in the fermentation broth per unit volume, and provide a basis for the development and application of this strain.
Method
2
The growth curve of strain ZL8 in LB culture medium was determined and its growth law in liquid medium was clarified. With the number of live bacteria in the fermentation broth of strain ZL8, the dry weight of the bacteria and the
A
600
value of the broth as detection indicators, single factor investigation was carried out on different nitrogen sources,carbon sources and inorganic salts to determine the optimal medium components. Additionally, orthogonal test was conducted to optimize the component ratio to screen the optimal fermentation medium. Similarly, single factor investigation and orthogonal test were also carried out in four aspects: inoculation amount,culture temperature,time and rotating speed to obtain the optimal culture conditions.
Result
2
The optimal medium for liquid fermentation of strain ZL8 was peptone 15 g·L
-1
, glucose 7.5 g·L
-1
, and potassium chloride 10 g·L
-1
. After 48 h of fermentation,the number of viable bacteria in the fermentation liquid could reach 8.93×10
9
cfu·mL
-1
,3.93 times that of LB liquid medium (
P
<
0.01). The optimal fermentation conditions were as follows: inoculation amount 3%, temperature 28 ℃, time 72 h,and rotating speed 220 r·min
-1
, and the number of viable bacteria in the fermentation broth could reach 6.37×10
10
cfu·mL
-1
.
Conclusion
2
Compared with LB culture medium and the initial fermentation conditions,the optimized culture medium and conditions could effectively increase the bacterial volume of strain ZL8 per unit volume and prolong the stable growth of the strain, with low medium cost, which provided a theoretical basis for the efficient fermentation and application of
Pseudomonas
ZL8.
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