Natal plum is a South African indigenous fruit. Natal plum were stored at 2, 4, 10 and 25 °C (control) temperatures up to 12 days, and fruit were evaluated at 4 day intervals for changes in quality and phenolic compounds. The results showed that 2 °C significantly reduced the weight loss and total colour difference while maintaining the quality attributes. Supervised Orthogonal Projections to Latent Structures Discriminant Analysis (OPLS-DA) and the ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometer and chemometric approach separated the fruit stored at low temperature from those stored at 25 °C, and a unique marker compound quinic acid was identified with the low temperature fruit. Similarly, cyanidin (aglycone) separated the fruit stored at 2 °C from those stored at other lower temperatures (4, and 10 °C). Thus, it can be proposed that the temperature stress at 2 °C had favoured the cold-induced accumulation of cyanidin derivatives (anthocyanins) to provide chilling tolerance. The bioactive compounds (cyanidin-3-O-pyranoside (10.4 mg kg⁻¹), cyanidin-3-O-glucoside (54 mg kg⁻¹), and quercetin 3-O-rhamnosyl glucoside (57 mg kg⁻¹)] and the antioxidant activity (FRAP assay) were significantly higher in fruit stored at 2 °C for 12 days. Thus, storage of Natal plum at 2 °C for 12 days can be recommended if the fruit are used as a functional ingredient.

纳塔尔李子是南非土著水果。将纳塔尔李子分别在2、4、10和25°C（对照）温度下保存12天，并以4天为间隔评估水果的品质和酚类化合物的变化。结果表明，2°C可以显着减少重量减轻和总色差，同时保持质量属性。监督正交投影到潜在结构判别分析（OPLS-DA）和超高效液相色谱四极杆飞行时间质谱仪和化学计量学方法，将低温储存的水果与25°C储存的水果分开，并使用独特的标记低温水果鉴定出复合奎尼酸。同样，花青素（糖苷配基）将2°C下储存的水果与其他较低温度（4和10°C）下储存的水果分开。从而，可以提出，在2°C下的温度应力有利于冷诱导的花青素衍生物（花青素）的积累，以提供耐寒性。生物活性化合物（花青素-3-O-吡喃糖苷（10.4 mg kg ^-1），花青素3- O-葡萄糖苷（54 mg kg ^-1）和槲皮素3- O-鼠李糖基葡萄糖苷（57 mg kg ^-1）]和抗氧化活性（FRAP分析）在2°C下储存12天的水果中的含量明显更高。因此，如果将水果用作功能成分，建议将纳塔尔李子在2°C下保存12天。