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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Wei Hu

http://orcid.org/0000-0002-6678-9468

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Journal of Zhejiang University SCIENCE B 2016 Vol.17 No.4 P.262-270

http://doi.org/10.1631/jzus.B1500120


Changes in the physiological properties and kinetics of citric acid accumulation via carbon ion irradiation mutagenesis of Aspergillus niger


Author(s):  Wei Hu, Ji-hong Chen, Shu-yang Wang, Jing Liu, Yuan Song, Qing-feng Wu, Wen-jian Li

Affiliation(s):  Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; more

Corresponding email(s):   chjh@impcas.ac.cn, wjli@impcas.ac.cn

Key Words:  Carbon ion irradiation, Physiological properties, Mutation, Citric acid accumulation


Wei Hu, Ji-hong Chen, Shu-yang Wang, Jing Liu, Yuan Song, Qing-feng Wu, Wen-jian Li. Changes in the physiological properties and kinetics of citric acid accumulation via carbon ion irradiation mutagenesis of Aspergillus niger[J]. Journal of Zhejiang University Science B, 2016, 17(4): 262-270.

@article{title="Changes in the physiological properties and kinetics of citric acid accumulation via carbon ion irradiation mutagenesis of Aspergillus niger",
author="Wei Hu, Ji-hong Chen, Shu-yang Wang, Jing Liu, Yuan Song, Qing-feng Wu, Wen-jian Li",
journal="Journal of Zhejiang University Science B",
volume="17",
number="4",
pages="262-270",
year="2016",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.B1500120"
}

%0 Journal Article
%T Changes in the physiological properties and kinetics of citric acid accumulation via carbon ion irradiation mutagenesis of Aspergillus niger
%A Wei Hu
%A Ji-hong Chen
%A Shu-yang Wang
%A Jing Liu
%A Yuan Song
%A Qing-feng Wu
%A Wen-jian Li
%J Journal of Zhejiang University SCIENCE B
%V 17
%N 4
%P 262-270
%@ 1673-1581
%D 2016
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.B1500120

TY - JOUR
T1 - Changes in the physiological properties and kinetics of citric acid accumulation via carbon ion irradiation mutagenesis of Aspergillus niger
A1 - Wei Hu
A1 - Ji-hong Chen
A1 - Shu-yang Wang
A1 - Jing Liu
A1 - Yuan Song
A1 - Qing-feng Wu
A1 - Wen-jian Li
J0 - Journal of Zhejiang University Science B
VL - 17
IS - 4
SP - 262
EP - 270
%@ 1673-1581
Y1 - 2016
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.B1500120


Abstract: 
The objective of this work was to produce citric acid from corn starch using a newly isolated mutant of Aspergillus , and to analyze the relationship between changes in the physiological properties of A. induced by carbon ion irradiation and citric acid accumulation. Our results showed that the physiological characteristics of conidia in A. niger were closely related to citric acid accumulation and that lower growth rate and viability of conidia may be beneficial to citric acid accumulation. Using corn starch as a raw material, a high-yielding citric acid mutant, named HW2, was obtained. In a 10-L bioreactor, HW2 can accumulate 118.9 g/L citric acid with a residual total sugar concentration of only 14.4 g/L. This represented an 18% increase in citric acid accumulation and a 12.5% decrease in sugar utilization compared with the original strain.

碳离子束诱导黑曲霉生理特性的改变与其柠檬酸积累关系的研究

目的:探讨黑曲霉生理特性的改变对其柠檬酸积累的影响。
创新点:首次报道了碳离子束对黑曲霉生理特性的影响,提出黑曲霉生理特性的改变对其柠檬酸的积累有影响。
方法:(1)孢子直径和孢子活力的测定:利用流式细胞仪对两株黑曲霉突变菌株以及原始菌株进行了孢子直径测定。通过该实验说明碳离子束可以诱导黑曲霉孢子直径发生改变(表1)。利用MTT法,测定了突变菌株和原始菌株孢子活力。同时,通过该实验表明碳离子束可以诱导黑曲霉孢子活力发生改变(图1)。(2)生长速率的测定:利用不同糖分的平板生长法测定了突变体和原始菌株生长速度的差异。通过该实验说明碳离子束可以诱导黑曲霉生长速率发生改变(图3和图4)。(3)柠檬酸积累实验:利用摇瓶发酵实验和10 L发酵罐扩培实验测定了突变体和原始菌株柠檬酸积累的差异。通过该实验说明生理特性改变的突变体与原始菌株在柠檬酸积累上存在显著差异(图6~8)。
结论:通过两株黑曲霉突变体与原始菌株之间生理特性的差异研究,我们发现黑曲霉生理特性的改变对其柠檬酸积累有一定的影响,低的黑曲霉孢子活力以及生长速率对柠檬酸的积累是有益的。最终,获得了一株高产菌株HW2,其10 L发酵罐柠檬酸的积累能力比原始菌株提高了18%。

关键词:碳离子束辐照;生理特性;突变;柠檬酸积累

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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