Abstract：
In this study, a new composite with combination of chitosan oligosaccharide (COS) and zinc oxide nanoparticles (ZnO NPs), termed Chitosan Oligosaccharide-Zinc Oxide Nanocomposites (COS-ZnO NC), was designed to enhance the quality of tomato fruits during postharvest storage. SEM analysis showed a uniform distribution of COS-ZnO NC films on tomato surfaces, indicating high biocompatibility, while the FTIR spectrum confirmed the interaction of COS and ZnO NPs via hydrogen bonds. The COS-ZnO NC exerts positive effects on post-harvest quality of tomato fruits, including significantly reduced water loss, fewer skin wrinkles, increased sugar-acid ratio, and enhanced vitamin C and carotenoids accumulation. Furthermore, COS-ZnO NC induces transcription of carotenoid biosynthesis genes and promotes carotenoids storage in the chromoplast. These results suggest that the COS-ZnO NC film can significantly improve the quality traits of tomato fruits, and therefore is potential in post-harvest storage of tomato fruits.
摘要：
在这项研究中,壳寡糖（COS）和氧化锌纳米颗粒（ZnONPs）组合的新型复合材料，称为壳聚糖寡糖-氧化锌纳米复合材料（COS-ZnONC），旨在提高番茄果实采后贮藏的品质。SEM分析表明COS-ZnONC薄膜在番茄表面均匀分布,表明高生物相容性，而FTIR光谱证实了COS和ZnONPs通过氢键相互作用。COS-ZnONC对番茄果实采后品质有积极影响,包括显著减少水分流失，更少的皮肤皱纹，糖酸比增加，并增强维生素C和类胡萝卜素的积累。此外，COS-ZnONC诱导类胡萝卜素生物合成基因的转录并促进类胡萝卜素在染色体体中的储存。这些结果表明，COS-ZnONC膜可以显著改善番茄果实的品质性状，因此是番茄果实收获后贮藏的潜力。
