Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides

Gong H, Yang Y, Pluntke M, Marti O, Majer Z, Sewald N, Volkmer D (2014)
Dalton Transactions 43(44): 16857-16871.

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Abstract
Four amphiphilic peptides with designed hairpin structure were synthesized and their monolayers were employed as model systems to study biologically inspired calcium carbonate crystallization. Langmuir monolayers of hairpin peptides were investigated by surface pressure area isotherms, surface potential isotherms, Brewster angle microscopy (BAM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy. A beta-hairpin conformation was found for all peptides at the air-water interface although their packing arrangements seem to be different. Crystallization of calcium carbonate under these peptide monolayers was investigated at different surface pressures and growth times both by in situ optical microscopy, BAM and ex situ investigations such as scanning electron microscopy (SEM) and transmission electron microscopy (TEM). An amorphous calcium carbonate precursor was found at the initial crystallization stage. The crystallization process occurred in three stages. It starts from the nucleation of amorphous particles being a kinetically controlled process. Crystal nuclei subsequently aggregate to large particles and vaterite crystals start to form inside the amorphous layer, with the monolayer fluidity exerting an important role. The third process includes the re-crystallization of vaterite to calcite, which is thermodynamically controlled by monolayer structural factors including the monolayer flexibility and packing arrangement of the polar headgroups. Thus, the kinetic factors, monolayer fluidity and flexibility as well as structure factors govern the crystal morphology and polymorph distribution simultaneously and synergistically.
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Gong H, Yang Y, Pluntke M, et al. Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides. Dalton Transactions. 2014;43(44):16857-16871.
Gong, H., Yang, Y., Pluntke, M., Marti, O., Majer, Z., Sewald, N., & Volkmer, D. (2014). Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides. Dalton Transactions, 43(44), 16857-16871.
Gong, H., Yang, Y., Pluntke, M., Marti, O., Majer, Z., Sewald, N., and Volkmer, D. (2014). Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides. Dalton Transactions 43, 16857-16871.
Gong, H., et al., 2014. Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides. Dalton Transactions, 43(44), p 16857-16871.
H. Gong, et al., “Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides”, Dalton Transactions, vol. 43, 2014, pp. 16857-16871.
Gong, H., Yang, Y., Pluntke, M., Marti, O., Majer, Z., Sewald, N., Volkmer, D.: Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides. Dalton Transactions. 43, 16857-16871 (2014).
Gong, Haofei, Yang, Yi, Pluntke, Manuela, Marti, Othmar, Majer, Zsuzsa, Sewald, Norbert, and Volkmer, Dirk. “Calcium carbonate crystal growth beneath Langmuir monolayers of acidic beta-hairpin peptides”. Dalton Transactions 43.44 (2014): 16857-16871.
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