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地衣芽孢桿菌WX—02補硝酸鈉發酵產聚γ—谷氨酸工藝

2014-05-04 18:33許尚華胡麗芳陳守文
湖北農業科學 2014年4期
關鍵詞:硝酸鈉華中農業大學補料

許尚華++胡麗芳++陳守文

摘要:以地衣芽孢桿菌(Bacillus licheniformis)WX-02為研究對象,以提高其發酵產生的聚γ-谷氨酸的產量為研究目的,經搖瓶發酵得到優化的硝酸鈉補料方案,即初始硝酸鈉濃度為10 g/L,發酵至12 h時補加5 g/L硝酸鈉時聚γ-谷氨酸產量最大。將此補料方案在3 L發酵罐上進行驗證。結果表明,發酵得到的菌體生物量和聚γ-谷氨酸產量最大值分別為4.5 g/L和38.7 g/L,與對照相比分別提高55.2%和14.8%。通過補硝酸鈉可以提高菌體生物量和對谷氨酸的利用率,從而提高聚γ-谷氨酸的發酵水平。

關鍵詞:地衣芽孢桿菌(Bacillus licheniformis);聚γ-谷氨酸;硝酸鈉;補料發酵;生物量

中圖分類號:TQ920.6 文獻標識碼:A 文章編號:0439-8114(2014)04-0903-04

Optimizing Sodium Nitrate Fed-batch Culture on Poly(γ-glutamic acid) Fermentation by Bacillus licheniformis WX-02

XU Shang-hua,HU Li-fang,CHEN Shou-wen

(Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University , Wuhan 430070,China)

Abstract: Bacillus licheniformis WX-02 was used to study the ways of improving poly(γ-glutamic acid)(γ-PGA) yield. The optimal conditions of sodium nitrate feeding for γ-PGA fermentation by Bacillus licheniformis WX-02 by flask-shaking fed-batch fermentation were the initial sodium nitrate concentration 10 g/L, and 5 g/L of sodium nitrate added when fermentation to 12 h. The fermentation was carried out in a 3 L fermentor, showing that the maximum of biomass and γ-PGA yield was 4.5 g/L and 38.7 g/L with increase of 55.2% and 14.8%, compared with the control. It is indicated that adding sodium nitrate can increase biomass, enhance the utilization of glutamate, and improve the γ-PGA fermentation.

Key words: Bacillus licheniformis; poly-gamma-glutamic acid; sodium nitrate; feeding fermentation; biomass

1 材料與方法

1.1 材料

1.1.1 菌株 地衣芽孢桿菌WX-02,由華中農業大學農業微生物學國家重點實驗室篩選和保藏,保藏號為CCTCC M208065。

1.2 方法

參考文獻:

[1] 陳詠竹,孫啟玲.γ-多聚谷氨酸的性質、發酵生產及其應用[J].微生物學通報,2004,31(1): 122-126.

[2] BAJAJ I, SINGHAL R. Poly(glutamic acid)- an emerging biopolymer of commercial interest[J]. Bioresour Technol,2011, 102(10):5551-5561.

[3] 曹名鋒,金映虹,解 慧,等.γ-聚谷氨酸的微生物合成、相關基因及應用展望[J].微生物學通報,2011,38(3):388-395.

[4] 蔡 謹,孫章輝,王 雋,等.補料發酵工藝的應用及其研究進展[J].工業微生物,2005,35(1):42-48.

[5] 呂 萌,梁金鐘,王風青.補料發酵枯草芽孢桿菌合成γ-聚谷氨酸的研究[J].食品科學,2011, 32(23):225-228.

[6] 胡麗芳,李 欣,冀志霞,等.地衣芽胞桿菌WX-02補糖發酵聚γ-谷氨酸的工藝優化[J]. 華中農業大學學報,2012,31(3):287-292.

[7] YOON S H, DO J H, LEE S Y, et al. Production of poly-γ-glutamic acid by fed-batch culture of Bacillus licheniformis[J]. Biotechnology Letters,2000,22(7):585-588.

[8] KRAFTA B, STROUSA M, TEGETMEYER H E. Microbial nitrate respiration -Genes, enzymes and environmental distribution[J]. Journal of Biotechnology, 2011,155(1):104-117.

[9] CHENG C, ASADA Y, AIDA T. Production of γ-polyglutamic acid by Bacillus licheniformis A35 under denitrifying conditions[J]. Agricultural and Biological Chemistry,1989,53(9):2369-2375.

[10] XU K D, STEWART P S, XIA F, et al. Spatial physiological heterogeneity in Pseudomonas aeruginosa biofilm is determined by oxygen availability[J]. Appl Environ Microbiol, 1998,64(10):4035-4039.

[11] WEI X T, JI Z X, CHEN S W. Isolation of halotolerant Bacillus licheniformis WX-02 and regulatory effects of sodium chloride on yield and molecular sizes of poly-γ-glutamic acid[J]. Appl Biochem Biotechnol,2010,160(5):1332-1340.

摘要:以地衣芽孢桿菌(Bacillus licheniformis)WX-02為研究對象,以提高其發酵產生的聚γ-谷氨酸的產量為研究目的,經搖瓶發酵得到優化的硝酸鈉補料方案,即初始硝酸鈉濃度為10 g/L,發酵至12 h時補加5 g/L硝酸鈉時聚γ-谷氨酸產量最大。將此補料方案在3 L發酵罐上進行驗證。結果表明,發酵得到的菌體生物量和聚γ-谷氨酸產量最大值分別為4.5 g/L和38.7 g/L,與對照相比分別提高55.2%和14.8%。通過補硝酸鈉可以提高菌體生物量和對谷氨酸的利用率,從而提高聚γ-谷氨酸的發酵水平。

關鍵詞:地衣芽孢桿菌(Bacillus licheniformis);聚γ-谷氨酸;硝酸鈉;補料發酵;生物量

中圖分類號:TQ920.6 文獻標識碼:A 文章編號:0439-8114(2014)04-0903-04

Optimizing Sodium Nitrate Fed-batch Culture on Poly(γ-glutamic acid) Fermentation by Bacillus licheniformis WX-02

XU Shang-hua,HU Li-fang,CHEN Shou-wen

(Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University , Wuhan 430070,China)

Abstract: Bacillus licheniformis WX-02 was used to study the ways of improving poly(γ-glutamic acid)(γ-PGA) yield. The optimal conditions of sodium nitrate feeding for γ-PGA fermentation by Bacillus licheniformis WX-02 by flask-shaking fed-batch fermentation were the initial sodium nitrate concentration 10 g/L, and 5 g/L of sodium nitrate added when fermentation to 12 h. The fermentation was carried out in a 3 L fermentor, showing that the maximum of biomass and γ-PGA yield was 4.5 g/L and 38.7 g/L with increase of 55.2% and 14.8%, compared with the control. It is indicated that adding sodium nitrate can increase biomass, enhance the utilization of glutamate, and improve the γ-PGA fermentation.

Key words: Bacillus licheniformis; poly-gamma-glutamic acid; sodium nitrate; feeding fermentation; biomass

1 材料與方法

1.1 材料

1.1.1 菌株 地衣芽孢桿菌WX-02,由華中農業大學農業微生物學國家重點實驗室篩選和保藏,保藏號為CCTCC M208065。

1.2 方法

參考文獻:

[1] 陳詠竹,孫啟玲.γ-多聚谷氨酸的性質、發酵生產及其應用[J].微生物學通報,2004,31(1): 122-126.

[2] BAJAJ I, SINGHAL R. Poly(glutamic acid)- an emerging biopolymer of commercial interest[J]. Bioresour Technol,2011, 102(10):5551-5561.

[3] 曹名鋒,金映虹,解 慧,等.γ-聚谷氨酸的微生物合成、相關基因及應用展望[J].微生物學通報,2011,38(3):388-395.

[4] 蔡 謹,孫章輝,王 雋,等.補料發酵工藝的應用及其研究進展[J].工業微生物,2005,35(1):42-48.

[5] 呂 萌,梁金鐘,王風青.補料發酵枯草芽孢桿菌合成γ-聚谷氨酸的研究[J].食品科學,2011, 32(23):225-228.

[6] 胡麗芳,李 欣,冀志霞,等.地衣芽胞桿菌WX-02補糖發酵聚γ-谷氨酸的工藝優化[J]. 華中農業大學學報,2012,31(3):287-292.

[7] YOON S H, DO J H, LEE S Y, et al. Production of poly-γ-glutamic acid by fed-batch culture of Bacillus licheniformis[J]. Biotechnology Letters,2000,22(7):585-588.

[8] KRAFTA B, STROUSA M, TEGETMEYER H E. Microbial nitrate respiration -Genes, enzymes and environmental distribution[J]. Journal of Biotechnology, 2011,155(1):104-117.

[9] CHENG C, ASADA Y, AIDA T. Production of γ-polyglutamic acid by Bacillus licheniformis A35 under denitrifying conditions[J]. Agricultural and Biological Chemistry,1989,53(9):2369-2375.

[10] XU K D, STEWART P S, XIA F, et al. Spatial physiological heterogeneity in Pseudomonas aeruginosa biofilm is determined by oxygen availability[J]. Appl Environ Microbiol, 1998,64(10):4035-4039.

[11] WEI X T, JI Z X, CHEN S W. Isolation of halotolerant Bacillus licheniformis WX-02 and regulatory effects of sodium chloride on yield and molecular sizes of poly-γ-glutamic acid[J]. Appl Biochem Biotechnol,2010,160(5):1332-1340.

摘要:以地衣芽孢桿菌(Bacillus licheniformis)WX-02為研究對象,以提高其發酵產生的聚γ-谷氨酸的產量為研究目的,經搖瓶發酵得到優化的硝酸鈉補料方案,即初始硝酸鈉濃度為10 g/L,發酵至12 h時補加5 g/L硝酸鈉時聚γ-谷氨酸產量最大。將此補料方案在3 L發酵罐上進行驗證。結果表明,發酵得到的菌體生物量和聚γ-谷氨酸產量最大值分別為4.5 g/L和38.7 g/L,與對照相比分別提高55.2%和14.8%。通過補硝酸鈉可以提高菌體生物量和對谷氨酸的利用率,從而提高聚γ-谷氨酸的發酵水平。

關鍵詞:地衣芽孢桿菌(Bacillus licheniformis);聚γ-谷氨酸;硝酸鈉;補料發酵;生物量

中圖分類號:TQ920.6 文獻標識碼:A 文章編號:0439-8114(2014)04-0903-04

Optimizing Sodium Nitrate Fed-batch Culture on Poly(γ-glutamic acid) Fermentation by Bacillus licheniformis WX-02

XU Shang-hua,HU Li-fang,CHEN Shou-wen

(Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University , Wuhan 430070,China)

Abstract: Bacillus licheniformis WX-02 was used to study the ways of improving poly(γ-glutamic acid)(γ-PGA) yield. The optimal conditions of sodium nitrate feeding for γ-PGA fermentation by Bacillus licheniformis WX-02 by flask-shaking fed-batch fermentation were the initial sodium nitrate concentration 10 g/L, and 5 g/L of sodium nitrate added when fermentation to 12 h. The fermentation was carried out in a 3 L fermentor, showing that the maximum of biomass and γ-PGA yield was 4.5 g/L and 38.7 g/L with increase of 55.2% and 14.8%, compared with the control. It is indicated that adding sodium nitrate can increase biomass, enhance the utilization of glutamate, and improve the γ-PGA fermentation.

Key words: Bacillus licheniformis; poly-gamma-glutamic acid; sodium nitrate; feeding fermentation; biomass

1 材料與方法

1.1 材料

1.1.1 菌株 地衣芽孢桿菌WX-02,由華中農業大學農業微生物學國家重點實驗室篩選和保藏,保藏號為CCTCC M208065。

1.2 方法

參考文獻:

[1] 陳詠竹,孫啟玲.γ-多聚谷氨酸的性質、發酵生產及其應用[J].微生物學通報,2004,31(1): 122-126.

[2] BAJAJ I, SINGHAL R. Poly(glutamic acid)- an emerging biopolymer of commercial interest[J]. Bioresour Technol,2011, 102(10):5551-5561.

[3] 曹名鋒,金映虹,解 慧,等.γ-聚谷氨酸的微生物合成、相關基因及應用展望[J].微生物學通報,2011,38(3):388-395.

[4] 蔡 謹,孫章輝,王 雋,等.補料發酵工藝的應用及其研究進展[J].工業微生物,2005,35(1):42-48.

[5] 呂 萌,梁金鐘,王風青.補料發酵枯草芽孢桿菌合成γ-聚谷氨酸的研究[J].食品科學,2011, 32(23):225-228.

[6] 胡麗芳,李 欣,冀志霞,等.地衣芽胞桿菌WX-02補糖發酵聚γ-谷氨酸的工藝優化[J]. 華中農業大學學報,2012,31(3):287-292.

[7] YOON S H, DO J H, LEE S Y, et al. Production of poly-γ-glutamic acid by fed-batch culture of Bacillus licheniformis[J]. Biotechnology Letters,2000,22(7):585-588.

[8] KRAFTA B, STROUSA M, TEGETMEYER H E. Microbial nitrate respiration -Genes, enzymes and environmental distribution[J]. Journal of Biotechnology, 2011,155(1):104-117.

[9] CHENG C, ASADA Y, AIDA T. Production of γ-polyglutamic acid by Bacillus licheniformis A35 under denitrifying conditions[J]. Agricultural and Biological Chemistry,1989,53(9):2369-2375.

[10] XU K D, STEWART P S, XIA F, et al. Spatial physiological heterogeneity in Pseudomonas aeruginosa biofilm is determined by oxygen availability[J]. Appl Environ Microbiol, 1998,64(10):4035-4039.

[11] WEI X T, JI Z X, CHEN S W. Isolation of halotolerant Bacillus licheniformis WX-02 and regulatory effects of sodium chloride on yield and molecular sizes of poly-γ-glutamic acid[J]. Appl Biochem Biotechnol,2010,160(5):1332-1340.

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