De Santis Diana, Bellincontro Andrea, Forniti Roberto, Botondi Rinaldo
Department for Innovation in Biological, Agro-Food and Forest Systems-DIBAF University of Tuscia, 01100 Viterbo, Italy.
Foods. 2021 Feb 3;10(2):322. doi: 10.3390/foods10020322.
Red Cesanese wine grapes, picked at around 22-23 °Brix, were treated with gas ethylene (500 mg L) for 15, 24, and 36 h, or air at 20 °C and 95-100% relative humidity (R.H.), then analysed for titratable acidity, sugar content, pH, total phenols, total and specific anthocyanins, and volatile compounds. Ethylene treatments increased the polyphenol content from 412 to 505 and 488 mg L (about +23 and +19%) for 15 and 24 h samples, respectively. Anthocyanins were increased by ethylene, mainly for 15 h treatment (about +17%). The 36 h ethylene treatment induced a loss anthocyanins (-14%), while phenols practically returned to the initial content. A high content of ethanol, acetic acid, and ethyl acetate were detected in 36 h ethylene-treated grapes, together with higher isoamyl acetate content, compared to air and other ethylene treatments. C6 compounds, markers of lipids peroxidation, were slightly higher in 36 h ethylene-treated samples than in control. Shorter ethylene treatments did not significantly modify the aroma profile compared to air treatment.
红切萨内塞葡萄酒葡萄在约22 - 23°波美度时采摘，用气态乙烯（500毫克/升）处理15、24和36小时，或在20°C和相对湿度95 - 100%的空气中处理，然后分析其可滴定酸度、糖含量、pH值、总酚、总花青素和特定花青素以及挥发性化合物。乙烯处理使15小时和24小时样品的多酚含量分别从412毫克/升增加到505毫克/升和488毫克/升（分别约增加23%和19%）。乙烯使花青素增加，主要是15小时处理（约增加17%）。36小时乙烯处理导致花青素损失（-14%），而酚类物质几乎恢复到初始含量。与空气处理和其他乙烯处理相比，36小时乙烯处理的葡萄中检测到高含量的乙醇、乙酸和乙酸乙酯，同时乙酸异戊酯含量更高。脂质过氧化的标志物C6化合物在36小时乙烯处理的样品中略高于对照。与空气处理相比，较短时间的乙烯处理对香气特征没有显著影响。
