What the study found
The study found that a homochiral hydrogen-bonded biohybrid framework built inside PET (poly(ethylene terephthalate)) nanochannels enabled near-complete separation of racemic histidine, with d-histidine preferentially transported and ee (enantiomeric excess, a measure of how much one mirror-image form is favored) above 99%.
Why the authors say this matters
The authors say this matters because homochiral nanochannel membranes are considered promising for scalable enantiomer separation, but high enantioselectivity and strong flux have been hard to achieve because of structural instability and uneven active sites. They conclude that their approach offers a scalable platform for high-efficiency chiral separations in pharmaceuticals.
What the researchers tested
The researchers tested a voltage-driven in situ assembly strategy to construct a homochiral hydrogen-bonded biohybrid framework (HBF) within PET nanochannels, using directional hydrogen bonding between bovine serum albumin (BSA, a protein) and 1,3,6,8-tetra(terephthalic acid) pyrene (H4TBAPy). They evaluated the resulting HBF@PET membrane for amino acid enantioseparation.
What worked and what didn't
The HBF@PET membrane achieved ee above 99% for racemic histidine, with d-His transported at a flux of 4.52 ± 0.04 mmol m−2 h−1, which the abstract says surpassed state-of-the-art nanochannel systems. Mechanistic studies indicated stronger binding of the framework for l-His, which hindered l-His diffusion while allowing d-His to pass more readily. The membrane also showed applicability to tryptophan and arginine enantiomers.
What to keep in mind
The abstract does not describe detailed experimental limitations, failures, or long-term durability testing beyond stating that the framework achieved structural stability. The reported findings are limited to the amino acids named in the abstract and to the membrane system tested.
Key points
- A homochiral hydrogen-bonded biohybrid framework in PET nanochannels separated racemic histidine with ee above 99%.
- d-histidine was preferentially transported at a flux of 4.52 ± 0.04 mmol m−2 h−1.
- The framework was assembled using a voltage-driven in situ strategy based on bovine serum albumin and H4TBAPy.
- Mechanistic studies suggested stronger binding for l-histidine, which hindered its diffusion.
- The membrane was also reported to work for tryptophan and arginine enantiomers.
Disclosure
- Research title:
- Homochiral nanochannel membrane separates amino acid enantiomers efficiently
- Authors:
- Xinyue Chang, Yanxia Song, Liping Zhen, Ningshuang Gao, Zhiwen Zhao, Genping Meng, JINGLAI DUAN, Baodui Wang
- Institutions:
- State Key Laboratory of Chemical Engineering, Lanzhou University, Ji Hua Laboratory, PRG S&Tech (South Korea), University of Science and Technology of China, Chinese Academy of Sciences, Institute of Modern Physics
- Publication date:
- 2026-02-24
- OpenAlex record:
- View
- Image credit:
- Photo by www.kaboompics.com on Pexels · Pexels License
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