Taha Ibrahim M, Zaghlool Ayman, Nasr Ali, Nagib Ashraf, El Azab Islam H, Mersal Gaber A M, Ibrahim Mohamed M, Fahmy Alaa
Department of Food Science and Technology, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo 11884, Egypt.
Department of Food Science and Nutrition, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
Polymers (Basel). 2022 Apr 1;14(7):1439. doi: 10.3390/polym14071439.
The strawberry has a very short postharvest life due to its fast softening and decomposition. The goal of this research is to see how well a starch-silver nanoparticle (St-AgNPs) coating affects the physical, chemical, and microbiological qualities of strawberries during postharvest life. Additionally, the effect of washing with running water on silver concentration in coated strawberry fruit was studied by an inductively coupled plasma-optical emission spectrometer (ICP-OES). Furthermore, the shelf-life period was calculated in relation to the temperature of storage. Fourier transform infrared-attenuated total reflectance (FTIR-ATR), UV-Visible, and Transmission Electron Microscopic (TEM) were used to investigate the structure of starch-silver materials, the size and shape of AgNPs, respectively. The AgNPs were spherical, with an average size range of 12.7 nm. The coated samples had the lowest weight loss, decay, and microbial counts as compared to the uncoated sample. They had higher total acidity and anthocyanin contents as well. The washing process led to the almost complete removal of silver particles by rates ranging from 98.86 to 99.10%. Finally, the coating maintained strawberry qualities and lengthened their shelf-life from 2 to 6 days at room storage and from 8 to 16 days in cold storage.
由于草莓采后迅速软化和腐烂，其采后寿命非常短。本研究的目的是观察淀粉-银纳米颗粒（St-AgNPs）涂层对草莓采后物理、化学和微生物品质的影响程度。此外，通过电感耦合等离子体发射光谱仪（ICP-OES）研究了流水冲洗对涂层草莓果实中银浓度的影响。此外，还根据储存温度计算了货架期。分别使用傅里叶变换红外衰减全反射（FTIR-ATR）、紫外可见光谱和透射电子显微镜（TEM）来研究淀粉-银材料的结构、银纳米颗粒的尺寸和形状。银纳米颗粒呈球形，平均尺寸范围为12.7nm。与未涂层样品相比，涂层样品的失重、腐烂和微生物数量最低。它们的总酸度和花青素含量也更高。清洗过程使银颗粒的去除率达到98.86%至99.10%，几乎完全被去除。最后，该涂层保持了草莓的品质，并将其货架期在室温储存下从2天延长至6天，在冷藏条件下从8天延长至16天。
