Memfractance of proteinoids

Mougkogiannis, Panagiotis; Adamatzky, Andrew

Abstract

Proteinoids, or thermal proteins, are amino acid polymers formed at high temperatures by nonbiological processes. The objective of this study is to examine the memfractance characteristics of proteinoids within a supersaturated hydroxyapatite solution. The ionic solution utilized for the current-voltage (I-V) measurements possessed an ionic strength of 0.15 mol/L, a temperature of 37 °C, and a pH value of 7.4. The I-V curves exhibited distinct spikes, which are hypothesized to arise from the capacitive charging and discharging of the proteinoid-hydroxyapatite media. The experimental results demonstrated a positive correlation between the concentration of proteinoids and the observed number of spikes in the I-V curves. This observation provides evidence in favor of the hypothesis that the spikes originate from the proteinoids’ capacitive characteristics. The memfractance behavior exemplifies the capacity of proteinoids to retain electrical charge within the hydrated hydroxyapatite media. Additional investigation is required in order to comprehensively identify the memcapacitive phenomena and delve into their implications for models of protocellular membranes. In a nutshell, this study provides empirical support for the existence of capacitive membrane-memfractance mechanisms in ensembles of proteinoids.

• Journal Article Type: Article
• Acceptance Date: Mar 5, 2024
• Online Publication Date: Mar 18, 2024
• Publication Date: Apr 2, 2024
• Deposit Date: Mar 19, 2024
• Publicly Available Date: Apr 12, 2024
• Journal: ACS Omega
• Electronic ISSN: 2470-1343
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 13
• Pages: 15085–15100
• DOI: https://doi.org/10.1021/acsomega.3c09330
• Keywords: General Chemical Engineering, General Chemistry
• Public URL: https://uwe-repository.worktribe.com/output/11830926