Adsorption of amino acids on graphene: assessment of current force fields

Siva Dasetty, John K. Barrows, Sapna Sarupria

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We compare the free energies of adsorption (ΔAads) and the structural preferences of amino acids on graphene obtained using the non-polarizable force fields—Amberff99SB-ILDN/TIP3P, CHARMM36/modified-TIP3P, OPLS-AA/M/TIP3P, and Amber03w/TIP4P/2005. The amino acid-graphene interactions are favorable irrespective of the force field. While the magnitudes of ΔAads differ between the force fields, the relative free energy of adsorption across amino acids is similar for the studied force fields. ΔAads positively correlates with amino acid-graphene and negatively correlates with graphene-water interaction energies. Using a combination of principal component analysis and density-based clustering technique, we grouped the structures observed in the graphene adsorbed state. The resulting population of clusters, and the conformation in each cluster indicate that the structures of the amino acid in the graphene adsorbed state vary across force fields. The differences in the conformations of amino acids are more severe in the graphene adsorbed state compared to the bulk state for all the force fields. Our findings suggest that the force fields studied will give qualitatively consistent relative strength of adsorption across proteins but different structural preferences in the graphene adsorbed state.

Original languageEnglish (US)
Pages (from-to)2359-2372
Number of pages14
JournalSoft Matter
Issue number11
StatePublished - 2019
Externally publishedYes

Bibliographical note

Funding Information:
S. S. acknowledges the financial support, in part, by the Defense Threat Reduction Agency (HDTRA-1-16-1-0023), and Clemson University start-up funds. J. K. B. acknowledges funding from Clemson University Creative Inquiry program. We thank the Clemson Cyberinfrastructure Technology Integration group for the allotment of computing time on Palmetto cluster.

Publisher Copyright:
© The Royal Society of Chemistry.


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