Full
Outline
Chilled mutton was highly nutritious but prone to spoilage during storage due to microbial contamination and lipid oxidation. A high-barrier packaging film for chilled mutton was developed in this study. A flexible graphene oxide (GO)-grafted poly (L-lactic-co-butanediol itaconate) (GO-g-PLBI) was synthesized by melt polycondensation. GO-g-PLBI was blended with PLLA pellets to form PGLBI film. A high-barrier PGLBI/GO-carboxymethyl cellulose (CMC) composite film was subsequently fabricated by depositing a GO-CMC layer onto the PGLBI surface via vacuum filtration. The packaging properties of the composite film, such as gas barrier performance and its application potential in non-contact packaging of chilled mutton were investigated. Results demonstrated that incorporation of GO effectively improved the hydrophilicity of PGLBI, facilitating its composite with the GO-CMC component. Characterizations by scanning electron microscopy and X-ray diffraction confirmed that a dense "brick-and-mortar" structure was formed inside the PGLBI/GO-CMC film, which reduced its oxygen permeability from 41.9 cm3/m2·d of the PGLBI film to 0.5 cm3/m2·d. Additionally, the composite film exhibited excellent ultraviolet shielding performance, with transmittances of 7.03% for long-wave UV and 1.45% for medium-wave UV. When applied to chilled mutton packaging, the composite film could inhibit microbial proliferation, protein degradation, and lipid oxidation during storage. Compared with the commercial high-barrier polyamide/polyethylene film, the PGLBI/GO-CMC film extended the shelf life of chilled mutton by 5 days.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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