Sulfur hexafluoride plasma surface modification of Gly-Ala and Ala-Gly as Bombyx mori silk model compounds: Mechanism investigations

Autor:	Dheerawan Boonyawan, W. Sangprasert, Piyarat Nimmanpipug, Kohji Tashiro, Vannajan Sanghiran Lee
Rok vydání:	2010
Předmět:	biology Hydrogen Radical fungi Organic Chemistry chemistry.chemical_element Space group Crystal structure biology.organism_classification Analytical Chemistry Inorganic Chemistry Crystallography SILK chemistry Bombyx mori Fluorine Density functional theory Spectroscopy
Zdroj:	Journal of Molecular Structure. 963:130-136
ISSN:	0022-2860
DOI:	10.1016/j.molstruc.2009.10.025
Popis:	Low-pressure plasma has been used to improve the hydrophobicity of Thai silk. In this study, Glycine–Alanine (GA) and Alanine–Glycine (AG) were chosen to represent model compounds of Bombyx mori silk. Single crystals of the simplified model compounds were characterized by polarizing microscopy and X-ray diffraction. The space groups of P212121 and P21 were found for AG and GA, respectively. The initial structures for calculation were obtained from the experimental crystal structures. Density functional theory at the BHandHLYP levels was used to investigate possible mechanisms of fluorine radicals reacting with AG and GA in the SF6 plasma treatment. The results indicate that hydrogen atoms of silk model compounds were most likely to be abstracted from the alanine residue.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::77f20033aad66e440c7ec908bf825d3f https://doi.org/10.1016/j.molstruc.2009.10.025 Zobrazit plný text záznamu Full Text from ScienceDirect