Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (S1): S010302


Carboxymethyl starch cross-linked by electron beam radiation in presence of acrylic acid sensitizer

Doan Binh Nguyen Thanh Duoc Pham Thi Thu Hong   

  1. R & D Center for Radiation Technology, Vietnam Atomic Energy Institute 202A St. 11, Linh Xuan Ward, Thu Duc District, Ho Chi Minh City, Vietnam
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Doan Binh, Nguyen Thanh Duoc, Pham Thi Thu Hong. Carboxymethyl starch cross-linked by electron beam radiation in presence of acrylic acid sensitizer.Nuclear Science and Techniques, 2013, 24(S1): S010302


Carboxymethyl starch (CMS) can be cross-linked by electron beam radiation to form a biocompatible and environment-friendly hydrogel at a high absorbed dose and a condensed CMS concentration. Acrylic acid (AAc) can be used as a sensitizer in order to reduce the absorbed doses to an acceptable certain level. At an absorbed dose of 3?4 kGy, the gel content of crosslinked CMS can be obtained about 50% with 5% (w/w) AAc concentration used. The compressive strength of CMS samples increased with increasing their cross-linked densities due to raising absorbed doses. The swelling ratio of cross-linked CMS was also attainable at a maximum of 50 times in the distilled water. The enzymatic degradation of cross-linked CMS was carried out in acetate buffer pH 4.6 with 0.1% α-amylase enzymatic solution incubated at 40ºC for 6 h. The crosslinked CMS samples were degraded slower than uncrosslinked CMS ones. The results indicated that the highly cross-linked CMS was almost fully degradable when the enzymatic hydrolysis was performed during 6 h. The FT IR spectra of cross-linked CMS in the presence of AAc were examined to observe the carboxyl group of AAc in the structure of cross-linked CMS. The hydrophilic of cross-linked CMS surface was determined by a contact-angle analysis.

Key words: Sensitizer, Carboxymethyl starch, Crosslinking, Biodegradation, Electron beams, Radiation, Hydrophilic