Piroonpan Thananchai, Haema Kamonwon, Chirachanchai Suwabun, Pasanphan Wanvimol
Center of Radiation Processing for Polymer Modification and Nanotechnology (CRPN), Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road., Ladyao, Chatuchak, Bangkok 10900, Thailand.
Center of Radiation Processing for Polymer Modification and Nanotechnology (CRPN), Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road., Ladyao, Chatuchak, Bangkok 10900, Thailand; Department of Materials Science, Faculty of Science, Kasetsart University, 50 Ngam Wong Wan Road., Ladyao, Chatuchak, Bangkok 10900, Thailand.
Int J Biol Macromol. 2025 Feb;291:139093. doi: 10.1016/j.ijbiomac.2024.139093. Epub 2024 Dec 24.
Cyclic amine-multibranched poly(lactic acid) (mPLA) was prepared as a dual antioxidant and antimicrobial toward PLA active packaging for food shelf-life extension in a case study of bread. The mPLA was coupled with piperidine (PPR) containing a heterocyclic amine derivative, which is a nature-rich bioactive function. The functions of mPLA-PPR enhancing the PLA film performance were studied in comparison with PPR, mPLA and Tinuvin® 770. The mPLA-PPR promoted miscible nucleating action in the PLA film, and the elongation at break and ductility of PLA/mPLA-PPR were significantly improved with a resistivity against electron beam (EB) irradiation. The mPLA-PPR in the PLA film showed its antioxidation potential in both solution media and solid state. The PLA free radicals in solid-state created upon EB irradiation were efficiently stabilized by mPLA-PPR. The migration of PPR from the PLA matrix into food simulants was retarded when it was anchored on the mPLA. The PLA active film has antibacterial activity to inhibit the growth of E. coli and antimicrobial activity to inhibit expansion of natural molds on bread slices. This current study showed that the PLA/mPLA-PPR active film is a promising model of a functional bioplastic packaging for EB processed food sterilization and for food shelf-life extension.
在一项针对面包的案例研究中，制备了环状胺多支链聚乳酸（mPLA），作为一种双重抗氧化剂和抗菌剂用于聚乳酸（PLA）活性包装，以延长食品保质期。mPLA与含有杂环胺衍生物哌啶（PPR）偶联，该衍生物具有丰富的天然生物活性功能。与PPR、mPLA和Tinuvin® 770相比，研究了mPLA-PPR对PLA薄膜性能的增强作用。mPLA-PPR在PLA薄膜中促进了可混溶的成核作用，并且PLA/mPLA-PPR的断裂伸长率和延展性显著提高，同时具有抗电子束（EB）辐照的能力。PLA薄膜中的mPLA-PPR在溶液介质和固态中均显示出抗氧化潜力。mPLA-PPR有效地稳定了EB辐照时在固态中产生的PLA自由基。当PPR锚定在mPLA上时，其从PLA基质向食品模拟物中的迁移受到阻碍。PLA活性薄膜具有抗菌活性，可抑制大肠杆菌的生长，还具有抗微生物活性，可抑制面包片上天然霉菌的生长。当前研究表明，PLA/mPLA-PPR活性薄膜是一种有前景的功能性生物塑料包装模型，可用于EB处理的食品灭菌和延长食品保质期。
