Zena Yezihalem, Tesfaye Melakuu, Tumssa Zelalem, Periyasamy Selvakumar
Department of Chemical Engineering, Adama Science and Technology University, Adama, Ethiopia.
Heliyon. 2023 Aug 29;9(9):e19598. doi: 10.1016/j.heliyon.2023.e19598. eCollection 2023 Sep.
Poly (lactic acid) (PLA) has distinctive characteristics, including biodegradability, biocompatibility, thermal process ability, high transparency and good film-forming ability. However, PLA has some poor properties that limit its wide applicability. These properties include a low crystallization rate, poor thermal stability, and high brittleness. The main objective of this research was to investigate the effect of a modified elastin-collagen (m-ELA-COLL) matrix on the properties of PLA. The ELA-COLL matrix was extracted from broiler skin waste and modified by grafting using lactic acid monomer to facilitate compatibility with PLA. The extracted and modified ELA-COLL matrix was investigated using FTIR, and α-helix and β-sheet structures were confirmed in both cases (pre- and post-modifications). Modified elastin-collagen dispersed Poly (lactic acid) (PLA-m-ELA-COLL) blend films were prepared using the solution casting method and characterized using DSC and UTM. The effect of m-ELA-COLL as a nucleating agent resulted in the degree of crystallinity improvement of 58.8% with 10 wt% m-ELA/COLL loading, and the elongation at break was improved by 161.3% for PLA-40%-m-ELA-COLL with a tensile strength of 33.75 MPa. The results obtained revealed that the biofilms can be considered as a good candidate to be studied further in the packaging industry.
聚乳酸（PLA）具有独特的特性，包括生物可降解性、生物相容性、热加工性、高透明度和良好的成膜能力。然而，PLA也存在一些不足之处，限制了其广泛应用。这些特性包括结晶速率低、热稳定性差和脆性高。本研究的主要目的是研究改性弹性蛋白-胶原蛋白（m-ELA-COLL）基质对PLA性能的影响。ELA-COLL基质从肉鸡皮废料中提取，并通过乳酸单体接枝进行改性，以促进与PLA的相容性。使用傅里叶变换红外光谱（FTIR）对提取和改性后的ELA-COLL基质进行了研究，在两种情况下（改性前和改性后）均确认了α-螺旋和β-折叠结构。采用溶液浇铸法制备了改性弹性蛋白-胶原蛋白分散聚乳酸（PLA-m-ELA-COLL）共混薄膜，并使用差示扫描量热仪（DSC）和万能材料试验机（UTM）进行了表征。m-ELA-COLL作为成核剂的作用使得在m-ELA/COLL负载量为10 wt%时结晶度提高了58.8%，对于拉伸强度为33.75 MPa的PLA-40%-m-ELA-COLL，断裂伸长率提高了161.3%。所得结果表明，这些生物薄膜可被视为在包装行业中有待进一步研究的良好候选材料。
