Polyhydroxyalkanoate biosynthesis and optimisation of thermophilic Geobacillus stearothermophilus strain K4E3_SPR_NPP.

IF 2.6 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Seema Prabhudev Rodge, Kundalik Shivaji Shende, Niranjan Prakashrao Patil
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Abstract

Polyhydroxyalkanoates (PHA) can be used to combat the challenges associated with plastic because it is biodegradable and can be produced from renewable resources. Extremophiles are considered to be potential PHA producers. An initial screening for the PHA synthesizing ability of a thermophilic bacteria Geobacillus stearothermophilus strain K4E3_SPR_NPP was carried out using Sudan black B staining. Nile red viable colony staining was used to further verify that the isolates produced PHA. Crotonic acid assays were used to determine the concentrations of PHA. The bacteria showed 31% PHA accumulation per dry cell weight (PHA/DCW) when glucose was used as a carbon source for growth. The molecule was identified to be medium chain length PHA, A copolymer of PHA containing poly(3-hydroxybutyrate)-poly(3-hydroxyvalerate)-poly(3-hydroxyhexanoate) (PHB-PHV-PHHX) using 1H-NMR. Six carbon sources and four nitrogen sources were screened for the synthesis of maximum PHA content, of which lactose and ammonium nitrate showed 45% and 53% PHA/DCW respectively. The important factors in the experiment are identified using the Plackett-Burman design, and optimization is performed using the response surface method. Response surface methodology was used to optimize the three important factors, and the maximum biomass and PHA productions were discovered. Optimal concentrations yielded a maximum of 0.48 g/l biomass and 0.32 g/l PHA, measuring 66.66% PHA accumulation. Dairy industry effluent was employed for the synthesis of PHA, yielding 0.73 g/l biomass and 0.33 g/l PHA, measuring 45% PHA accumulation. These findings add credibility to the possibility of adopting thermophilic isolates for PHA production using low-cost substrates.

Abstract Image

嗜热硬脂嗜热地杆菌菌株K4E3_SPR_NPP聚羟基烷酸酯生物合成及优化
聚羟基烷酸酯(PHA)可以用来对抗与塑料相关的挑战,因为它是可生物降解的,可以从可再生资源中生产。极端微生物被认为是潜在的PHA生产者。采用苏丹黑B染色法对嗜热细菌脂嗜热地杆菌菌株K4E3_SPR_NPP的PHA合成能力进行初步筛选。采用尼罗红活菌落染色进一步验证分离株产生PHA。采用巴罗通酸法测定PHA浓度。当葡萄糖作为碳源进行生长时,细菌每干细胞重量(PHA/DCW)的PHA积累量为31%。通过1H-NMR鉴定该分子为中链长度PHA,是PHA中含有聚(3-羟基丁酸酯)-聚(3-羟基戊酸酯)-聚(3-羟基己酸酯)(PHB-PHV-PHHX)的共聚物。筛选了6个碳源和4个氮源合成的PHA含量最高,其中乳糖和硝酸铵的PHA/DCW分别为45%和53%。采用Plackett-Burman设计确定了影响试验的重要因素,并采用响应面法进行了优化。利用响应面法对3个重要因子进行优化,得到了最大生物量和最大PHA产量。最佳浓度最大生物量为0.48 g/l, PHA为0.32 g/l, PHA积累量为66.66%。利用乳业废水合成PHA,生物量为0.73 g/l, PHA产量为0.33 g/l, PHA积累量为45%。这些发现增加了利用低成本底物采用嗜热分离菌生产PHA的可能性。
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来源期刊
Extremophiles
Extremophiles 生物-生化与分子生物学
CiteScore
6.80
自引率
6.90%
发文量
28
审稿时长
2 months
期刊介绍: Extremophiles features original research articles, reviews, and method papers on the biology, molecular biology, structure, function, and applications of microbial life at high or low temperature, pressure, acidity, alkalinity, salinity, or desiccation; or in the presence of organic solvents, heavy metals, normally toxic substances, or radiation.
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