Active packaging containing photocatalyst is generally used to solve the issues of loss and quality deterioration of fresh fruits. However, only ultraviolet (UV) light can activate these photo-catalysts in ethylene photo-degradation. To overcome this limitation, green synthesized silver nanoparticles (AgNPs) that inhibits ethylene gas production under visible light has been developed. In this study, spent green tea was mixed with deionized water at various ratios ranging from liquid to solid to obtain spent green tea extract (ex-SGT) having different concentrations used for synthesis of AgNPs. The results indicated that a good distribution of particles with a bandgap energy of 2.17 eV which was in the visible region for ethylene photo-degradation was successfully obtained with the synthesized AgNPs-60 (ex-SGT at the ratio of 60:1). The coated paper possessed an antibacterial activity and decreased the ethylene concentration in mango’s packaging. Based on the finding in this work, it appears that the coated paper could have potential to be used for novel packaging of fruits to delay their ripening so that their freshness can be maintained.

含有光催化剂的活性包装通常用于解决新鲜水果的损失和质量下降的问题。但是，只有紫外线（UV）才能激活乙烯光降解中的这些光催化剂。为了克服该限制，已经开发了在可见光下抑制乙烯气体产生的绿色合成银纳米颗粒（AgNP）。在这项研究中，将废绿茶与去离子水以从液体到固体的各种比例混合，以获得用于合成AgNPs的具有不同浓度的废绿茶提取物（ex-SGT）。结果表明，使用合成的AgNPs-60（ex-SGT的比例为60：1）成功地获得了能带隙能为2.17 eV的良好分布的颗粒，该带隙能在可见光区域用于乙烯的光降解。该涂布纸具有抗菌活性，并降低了芒果包装中的乙烯浓度。基于这项工作中的发现，看来涂布纸可能具有用于新颖包装水果的潜能，以延迟其成熟，从而可以保持其新鲜度。