Abstract
The effect of Escherichia coli (E. coli) cells on two phospholipids [dipalmitoyl phosphatidylcholine (DPPC) and dimyristoyl phosphatidylcholine (DMPC)] monolayers at the surface of a 1.5 wt% NaCl salt solution has been investigated using surface tension measurement and Brewster angle microscopy. The results showed that a DPPC monolayer that has an elastic structure was changed in morphology by interaction with E. coli cells, whereas a DMPC monolayer that has an expandable structure did not change in morphology. In particular, the morphology changed significantly around the liquid-expanded (LE)–liquid-condensed (LC) phase transition point for the DPPC monolayer. It was found that the LE–LC phase transition range in a DPPC monolayer was sensitive to influence from the outside of the monolayer such as the action of E. coli cells. Such a monolayer has the potential for application as a membrane sensor for detecting a small amount of bacteria in a short time.
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This work was supported by a Grant-in-Aid from the Ministry of Science, Education, Sports, and Culture (nos. 21750143 and 24550154), “The Knowledge Hub” of AICHI, The Priority Research Project.
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Okabe, M., Taga, K., Yoshino, A. et al. Effect of Escherichia coli on phospholipid monolayers: surface tensiometry and Brewster angle microscopy measurements. Eur Biophys J 49, 71–84 (2020). https://doi.org/10.1007/s00249-019-01413-z
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DOI: https://doi.org/10.1007/s00249-019-01413-z