Effect of polyaspartic acid on hydroxyapatite deposition in silk fibroin blend films
X. L. Ma, R. Li, L. Ru, G. W. Xu, Y. P. Huang
Vol. 4., No.5., Pages 321-327, 2010
DOI: 10.3144/expresspolymlett.2010.40
DOI: 10.3144/expresspolymlett.2010.40
Corresponding author: Y. P. Huang 
GRAPHICAL ABSTRACT
ABSTRACT
Polyaspartic acid/silk fibroin/hydroxyapatite (PASP/SF-HA) composites have been synthesized by biomimetic processing. SF solution was mixed with different contents of PASP to prepare the PASP/SF blend membranes. After ethanol treatment and premineralization process, the blend membranes were immersed into 1.5 simulated body fluid (1.5 SBF) for 24 h to induce apatite deposition at 37±0.5°C. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results revealed that a conformation transition of SF occurred after the addition of PASP and ethanol treatment. The FTIR and XRD results also confirmed that the main component of apatite deposition was HA. Scanning electron microscopy (SEM) showed that the content of HA increased with increasing PASP concentration .Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP) results revealed that the Ca/P molar ratio could reach 1.45, which was close to the Ca/P ratio of apatite. It was appropriate to conclude that the increasing content of PASP had a distinct effect on HA deposition in the blend films.
