生物合成的聚酸酸含有 (S) -和 (R) -3-基-2-甲基 propionate 单元的战术性特征
Maierwufu Mierzati1, Yuki Miyahara1, Blanche Curial1
1Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8502, Japan.
Biomacromolecules
|December 22, 2023
概括
这项研究引入了新的可生物降解塑料,聚基酸 (PHAs),具有α-碳甲基化单元. 操纵这些甲基化PHAs的战术性可以控制它们的材料特性和增强的热稳定性.
科学领域:
- 聚合物化学 聚合物化学
- 生物技术是生物技术.
- 材料科学 材料科学 材料科学
背景情况:
- 聚酸酸盐 (PHAs) 是由微生物合成的可生物降解塑料.
- 与传统的PHAs相比,α-碳甲基化PHAs具有不同的特性.
- 研究新的重复单元,如3-基-2-甲基胺 (3H2MP) 对于PHA创新至关重要.
研究的目的:
- 通过使用新型3H2MP单位合成和表征α-碳甲基化PHAs.
- 探索3H2MP战术性对PHA特性的影响.
- 建立一种通过聚合物战术控制PHA物理特征的方法.
主要方法:
- 再组合的Escherichia coli LSBJ被用于PHA合成.
- 在培养基中控制添加 (R) 和 (S) 异构体或血清3H2MPNa.
- 3H2MP与 (R) -3-基酸盐 (3HB) 的同聚合和共聚合.
主要成果:
- 通过5-100mol%的3H2MP单元实现了PHAs的合成.
- 高等离子性P(3H2MP) (R:S = 1:99) 的点为114-119°C.
- 由于种族化,从 (R) - 3H2MP中合成了阿塔克斯P(3H2MP) (R:S = 40:60).
- 与P(3HB) (257 °C) 相比,P(3H2MP) 的热稳定性提高 (313 °C).
结论:
- 在微生物合成过程中,可以控制3H2MP单元的战术性.
- 这种对战术性的控制允许定制PHA材料属性.
- 该研究提出了开发先进可生物降解塑料的新战略.
相关概念视频
01:26Polymer Classification: Stereospecificity
2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
01:00Characteristics and Nomenclature of Homopolymers
3.0K
Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
3.0K
01:24Characteristics and Nomenclature of Copolymers
2.5K
Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
2.5K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.4K
01:03Step-Growth Polymerization: Overview
3.5K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...
3.5K
02:05Prochirality
3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K