Linpin Luo,Wengang Cai,Wenqiao Su,Meilin Wang,Liang Zhang,Jing Sun,Jianlong Wang
The nanomaterials-functionalized composite packaging film with antimicrobial performance has attracted more and more research interests. However, designing the multi-mode synergistic composite film for efficient and intelligent antibacterial is still a challenge. In this work, a Fe-MoO x functionalized chitosan composite film (CS/FM) was designed by doping the Fe-MoO x into chitosan film. CS/FM film inherited excellent photothermal performance and photothermal-enhanced oxidase-like activity of Fe-MoO x , which endow CS/FM film with superior antimicrobial ability. The optimal composite film (CS/FM 0.2 ) able to killed ≥98.87% of S. aureus and ≥98.26% of E. coli , and could significantly inhibit the growth of P. expansum and P. italicum . Besides, CS/FM 0.2 film also showed good water vapor permeability (0.71 × 10 −10 g m −1 s −1 Pa −1 ) and tensile strength (58.16 MPa). Low hemolysis rate (≤ 4.91%), high cell viability (≥ 90.32%), and the normal body organs after being treated with Fe-MoO x verified the biosafety of CS/FM film. The tangerine preservation results indicated that CS/FM 0.2 film could extend the shelf life of tangerine by at least 9 days and prevent the loss of tangerine nutrients. Our work boosted the development of designing composite packaging film with multi-mode synergistic antimicrobial effect via nanomaterials functionalized for food preservation.
Linpin Luo,Meilin Wang,Wenqiao Su,Junchen Zhuo,Liang Zhang,Wenxin Zhu,Wentao Zhang,Rong Wang,Jianlong Wang
Antimicrobial packing showed great potential in extending the shelf life of food. However, developing a new biocomposite film with an intelligent and efficient antimicrobial performance is still desirable. Herein, a Fe-MoOx encapsulated with curcumin (Cur) filled chitosan-based composite film (CCF films) was prepared by solvent casting method. The total color differences of the CCF films were less than 30%, and satisfactory surface color, transparency, hydrophobicity, and thermal stability were also obtained. Besides, the UV-light/water/oxygen barrier capability and mechanical properties were enhanced with the incorporation of Cur@Fe-MoOx. Moreover, CCF films showed photothermal performance and thermal-controlled curcumin release ability, which endowed the CCF0.15 film with excellent antibacterial capability toward E. coli (≥99.95%) and S. aureus (≥99.96%) due to the synergistic antibacterial effect. Fe-MoOx exhibited high cell viability and less than 5% hemolysis even under the concentration of 500 μg mL–1. Based on those unique characteristics, the CCF0.15 film was chosen for tangerine preservation. The CCF0.15 film could prolong the shelf life of tangerine by at least 9 days compared with the unpacking group, and the tangerines could maintain the freshness characteristics over a 24 day storage period. Such thermal-mediated antibacterial film proposed by our work showed promising potential in food packaging.
危险品化学品经营许可证（带存储）