School of Agriculture and Food Science, Zhejiang Agricultural & Forestry University, Wusu Street # 666, Lin'an, Hangzhou Zhejiang 311300, People's Republic of China.
J Food Prot. 2018 Oct;81(10):1643-1650. doi: 10.4315/0362-028X.JFP-18-017.
Because of high water loss and rot observed in postharvest sweet potato ( Ipomoea batatas (L.) Lam.) roots, a carnauba wax (CW)-based nanoemulsion without or with glycerol monolaurate (CW-GML) was developed by a high-energy emulsification approach. The effects of the two coatings on decay, respiration rate, weight loss, surface color, total soluble sugar, and starch content as well as the sensory quality of sweet potato roots were investigated during storage at 20°C for 50 days. Compared with the control treatment (water) and CW coating alone, CW-GML coating exhibited higher emulsion stability and antifungal activity, and treatment resulted in a uniform and continuous coating on roots. The CW-GML and CW coatings both effectively reduced root weight loss and respiration rate and inhibited decay incidence compared with control roots during storage. The CW-GML coating showed markedly stronger inhibition of root rot than the CW coating. Both the CW-GML and CW coatings promoted an increase in root sweetness but did not negatively impact perceived flavor. The overall results demonstrate that the CW-GML coating holds great promise as an effective postharvest technology to preserve food quality and extend shelf life of sweet potato roots.
由于采后甘薯（Ipomoea batatas（L.）Lam.）根部水分流失和腐烂严重，本研究采用高能乳化法制备了一种不含或含甘油单月桂酸酯（CW-GML）的巴西棕榈蜡（CW）基纳米乳液。在 20°C 下贮藏 50 天期间，研究了这两种涂层对腐烂、呼吸速率、失重、表面颜色、总可溶性糖和淀粉含量以及甘薯根感官品质的影响。与对照处理（水）和单独的 CW 涂层相比，CW-GML 涂层表现出更高的乳液稳定性和抗真菌活性，并且在根上形成均匀连续的涂层。与对照根相比，CW-GML 和 CW 涂层在贮藏过程中均能有效降低根的失重率和呼吸速率，并抑制腐烂的发生。与 CW 涂层相比，CW-GML 涂层对根腐病的抑制作用更为显著。CW-GML 和 CW 涂层均能促进根的甜度增加，但不会对感知风味产生负面影响。总的来说，研究结果表明，CW-GML 涂层作为一种有效的采后技术，有望保持甘薯根的品质并延长其货架期。
