Preparation and antibacterial test of chitosan/PAA/PEGDA bi-layer composite membranes

Authors: Don, Trong-Ming; Chen, Ching-Chung; Lee, Chih-Kang; Cheng, Wei-Yuan; Cheng, Liao-Ping

Source: Journal of Biomaterials Science, Polymer Edition, Volume 16, Number 12, 2005 , pp. 1503-1519(17)

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Abstract:

Chitosan/poly(acrylic acid)/poly(ethylene glycol) diacrylate (PEGDA) composite membranes with a bi-layer configuration were prepared and their potential application as an antibacterial material was examined. A two-step process was adopted. A dope consisting of PEGDA, acrylic acid (AA) and a photoinitiator was cast and then UV-cured on a glass substrate to form a mechanically strong, dense membrane. Subsequently, the membrane was coated with a layer of solution composed of chitosan, AA and water. As the majority of AA diffused downwards into the supporting layer underneath, chitosan coagulated with residual AA to form a nano-layer on the top surface by means of UV irradiation. Low-voltage field-emission scanning electron microscopy was used to observe the membrane morphology and to measure the thickness of the top layer. Contact angle measurements indicated a top layer mixed with chitosan and poly(acrylic acid), which was confirmed by chemical composition analysis of X-ray photon spectroscopy. The antibacterial activities of the formed membranes were tested both with respect to a Gram-negative (Escherichia coli) and a Gram-positive (Staphylococcus aureus) bacteria.

Keywords: CHITOSAN; POLY(ACRYLIC ACID); COMPOSITE MEMBRANES; ANTIBACTERIAL ACTIVITY

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856205774576718

Publication date: 2005-12-01