从甘糖蜜和自来水中生产聚酸 (PHB),不经过杀菌,使用新品种Priestia sp. 在 YH4 中,YH4 是 YH4 的代码
Hee Ju Jung1, Sang Hyun Kim1, Nara Shin1
1Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea.
International journal of biological macromolecules
|August 9, 2023
概括
一种新的海洋微生物,Priestia sp. 通过使用甘糖蜜,YH4可以有效地生产聚乙酸 (PHB),而无需消毒. 这种具有成本效益的方法产生了显著的PHB,为石油塑料提供了可持续的替代品.
科学领域:
- 生物技术是生物技术.
- 聚合物科学 聚合物科学
- 微生物学 微生物学
背景情况:
- 可生物降解的聚合物,如聚基酸 (PHB) 的生产成本超过石油基塑料的生产成本.
- 利用廉价的碳来源和简化灭菌过程是降低PHB生产成本的关键.
研究的目的:
- 选和识别一种新的微生物菌株,以提高PHB的生产效率.
- 优化培养条件以最大限度地提高PHB产量,使用具有成本效益的基板.
- 评估简化,经济的PHB生产过程的可行性.
主要方法:
- 选海洋微生物用于PHB生产使用甘糖蜜没有杀菌.
- 优化培养参数,包括碳源,NaCl度,温度,pH值,注射剂大小和培养时间.
- 在5升发酵器中发酵,使用最小的介质成分 (自来水,糖蜜,NaCl).
- 使用差分扫描热量计 (DSC) 和凝透色谱 (GPC) 分析热性质和分子量.
主要成果:
- 一种新的PHB产生菌株,Priestia sp. 确定了YH4的身份.
- 在优化条件下,在5毫升培养中,干细胞重量 (DCW) 为5.94g/L,PHB含量为61.7%.
- 观察到类似的PHB生产与或没有杀菌.
- 在5升发酵器中,在41小时内,从24.8g/L的DCW中产生了13.9g/L的PHB.
- 鉴定结果显示Tm = 167.2 °C,Tc = 67.3 °C,Mw = 2.85 × 105,Mn = 1.05 × 105,而PDI = 2.7. 这两个值都不等于温度.
结论:
- 普里斯蒂亚特种 (Priestia sp.) 是一种植物. YH4是一种有前途的菌株,可用于经济的聚乙酸 (PHB) 生产.
- 使用甘糖蜜,避免消毒,大大降低了生产成本.
- 开发的工艺表明了大规模,具有成本效益的PHB制造的潜力.
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