Sornsumdaeng Kittichai, Seeharaj Panpailin, Prachayawarakorn Jutarat
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand; Advanced Materials Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand.
Int J Biol Macromol. 2021 Dec 15;193(Pt A):748-757. doi: 10.1016/j.ijbiomac.2021.10.157. Epub 2021 Oct 26.
Due to several important limitations for packaging applications of starch film such as strength and hydrophilicity, rice starch (Oryza sativa) film was crosslinked with citric acid and modified by different contents of calcium oxide. FTIR spectra showed the evidence of crosslinking by citric acid and the presence of calcium oxide in the modified rice starch films. After the crosslinking, the decrease of degree of crystallinity and swelling including the increase of film smoothness and strain at maximum load were observed. The application of both citric acid and calcium oxide caused greater decrease of swelling, moisture uptake as well as higher stiffness and antibacterial activity than those of the use of only the citric acid. The highest stiffness and antibacterial activity were found for the crosslinked film added by 5 wt% calcium oxide. Moreover, the effect of calcium oxide contents on morphological, thermal and biodegradable properties of the crosslinked films was also investigated.
由于淀粉膜在包装应用方面存在诸如强度和亲水性等几个重要限制，大米淀粉（水稻）膜与柠檬酸进行交联，并通过不同含量的氧化钙进行改性。傅里叶变换红外光谱显示了柠檬酸交联的证据以及改性大米淀粉膜中氧化钙的存在。交联后，观察到结晶度降低、溶胀度降低，包括薄膜光滑度增加以及最大负荷下应变增加。与仅使用柠檬酸相比，同时使用柠檬酸和氧化钙导致溶胀度、吸湿率降低，以及更高的硬度和抗菌活性。添加5 wt%氧化钙的交联膜具有最高的硬度和抗菌活性。此外，还研究了氧化钙含量对交联膜的形态、热性能和生物降解性能的影响。
