Zhang Lina, Sathiyaseelan Anbazhagan, Zhang Xin, Lu Yuting, Wang Myeong-Hyeon
Department of Bio-Health Convergence, Kangwon National University, Chuncheon 24341, Republic of Korea.
KIIT (Kangwon Institute of Inclusive Technology), Kangwon National University, Chuncheon 24341, Republic of Korea.
Nanomaterials (Basel). 2024 Jan 31;14(3):292. doi: 10.3390/nano14030292.
Banana () has been popular among consumers worldwide due to its rich nutrients and minerals. However, bananas are highly susceptible to the physical and biological factors that lead to postharvest loss during transportation and storage. In this work, novel sodium alginate (SA) films incorporated with silver nitroprusside nanoparticles (AgNNPs) were prepared to extend the shelf life of bananas through antibacterial and antioxidant coating. The results exhibited that AgNNPs were cubical and that their size was <500 nm, with metal composition being Ag and Fe. Additionally, the incorporation of AgNNPs in the SA film was seen in FE-SEM and zeta analysis, with an average size of about 365.6 nm. Furthermore, the functional and crystalline properties of AgNNPs were assessed through FTIR and XRD. Transmittance testing of the SA-AgNNPs films confirmed they have good UV barrier properties. SA-AgNNPs films exhibited excellent high antibacterial activity against foodborne pathogens including , , and at the concentration of 500 µg/mL. Moreover, during the storage of bananas, SA-AgNNPs nanocomposite coatings act as a barrier to microbial contamination and slow down the ripening of bananas. As a result, compared with SA-coated and uncoated bananas, SA-AgNNPs-coated bananas exhibited the lowest weight loss and lowest total bacterial colonies, thus greatly extending their shelf life. Particularly when coated with SA-AgNNPs films, total bacterial colonies (TBC) in the banana peel and pulp were as low as 1.13 × 10 and 51 CUF/g on the ninth day of storage, respectively. Our work offers an efficient strategy to improve the quality of bananas during the postharvest period, with extensive applications in fruit preservation and food packing.
香蕉（ ）因其丰富的营养成分和矿物质而深受全球消费者喜爱。然而，香蕉极易受到导致其在运输和储存过程中出现采后损失的物理和生物因素影响。在本研究中，制备了新型的负载硝普银纳米颗粒（AgNNPs）的海藻酸钠（SA）薄膜，通过抗菌和抗氧化涂层来延长香蕉的货架期。结果表明，AgNNPs呈立方体形状，尺寸小于500 nm，金属成分为Ag和Fe。此外，通过场发射扫描电子显微镜（FE - SEM）和zeta分析观察到AgNNPs掺入了SA薄膜中，平均尺寸约为365.6 nm。此外，通过傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）评估了AgNNPs的功能和晶体特性。SA - AgNNPs薄膜的透光率测试证实它们具有良好的紫外线阻隔性能。SA - AgNNPs薄膜在浓度为500 μg/mL时，对包括 、 和 在内的食源性病原体表现出优异的高抗菌活性。此外，在香蕉储存期间，SA - AgNNPs纳米复合涂层可作为微生物污染的屏障，并减缓香蕉的成熟。结果，与SA涂层香蕉和未涂层香蕉相比，SA - AgNNPs涂层香蕉的重量损失最低，总细菌菌落数也最低，从而大大延长了它们的货架期。特别是在涂覆SA - AgNNPs薄膜时，在储存第9天，香蕉果皮和果肉中的总细菌菌落数（TBC）分别低至1.13×10和51 CUF/g。我们的工作提供了一种在采后期提高香蕉品质的有效策略，在水果保鲜和食品包装中有广泛应用。
