Effects of degree of substitution and irradiation doses on the properties of hydrogel prepared from carboxymethyl-sago starch and polyethylene glycol

Irma Raihana Zahib; Paridah Md Tahir; Marina Talib; Rosfarizan Mohamad; Aisyah Humaira Alias; Seng Hua Lee

doi:10.1016/j.carbpol.2020.117224

Effects of degree of substitution and irradiation doses on the properties of hydrogel prepared from carboxymethyl-sago starch and polyethylene glycol

Carbohydr Polym. 2021 Jan 15:252:117224. doi: 10.1016/j.carbpol.2020.117224. Epub 2020 Oct 14.

Authors

Irma Raihana Zahib¹, Paridah Md Tahir², Marina Talib³, Rosfarizan Mohamad⁴, Aisyah Humaira Alias⁵, Seng Hua Lee⁶

Affiliations

¹ Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: irmaraihana@gmail.com.
² Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: parida@upm.edu.my.
³ Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor, Malaysia. Electronic address: marina@nuclearmalaysia.gov.my.
⁴ Faculty of Biotechnology and Biomolecular Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: farizan@upm.edu.my.
⁵ Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: a.humaira.aisyah@gmail.com.
⁶ Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. Electronic address: lee_seng@upm.edu.my.

PMID: 33183648
DOI: 10.1016/j.carbpol.2020.117224

Abstract

Carboxymethyl starch (CMS) was produced from sago starch via carboxymethylation. The CMS with different degree of substitution (DS) ranges from 0.4 to 0.8 were mixed with polyethylene glycol (PEG) of different molecular weight and distilled water and the hydrogel was cured by electron beam irradiation with doses ranging from 25 to 35 kGy. The results revealed that CMS-PEG hydrogels with DS 0.4 give the optimum gel content when radiated at 30 kGy and with PEG 600. Thermogravimetric analysis (TGA) revealed that there are two phases exist in CMS with DS 0.4 in contrast to the three steps decomposition occurs in DS 0.6 and 0.8. It shows that the CMS with DS 0.4 is more thermally stable. Surface morphology revealed crosslinking among the blends when subjected into the radiation dose. The study shows both radiation and PEG addition improved most of the properties of CMS irrespective of the DS value.

Keywords: Carboxymethyl starch; Degree of substitution; Hydrogel; Radiation; Sago starch.