Baibuch Sabrina, Zema Paula, Bonifazi Evelyn, Cabrera Gabriela, Mondragón Portocarrero Alicia Del Carmen, Campos Carmen, Malec Laura
Industries Department, Faculty of Exact and Natural Sciences, University City, University of Buenos Aires, Buenos Aires C1428EGA, Argentina.
Organic Chemistry Department, Faculty of Exact and Natural Sciences, University City, University of Buenos Aires, Buenos Aires C1428EGA, Argentina.
Antioxidants (Basel). 2023 Mar 10;12(3):681. doi: 10.3390/antiox12030681.
The effect of freeze and hot air drying methods on the retention of total phenolics, antioxidant activity (AA), and color of different cultivars of rose petals was analyzed. Both methods similarly preserved the phenolic content and AA, while freeze drying showed better red color retention. Furthermore, the conditions of total phenolics and AA extraction from two rose cultivars, and , were optimized by response surface methodology through a Box-Behnken design. The solvent exhibited a major effect on the total phenolic content (TPC) and AA. The selected parameters were ethanol 38%, 75 °C, and 30 min. Under these conditions, the predicted values for were 189.3 mg GA/g dw (TPC) and 535.6 mg Trolox/g dw (AA), and those for were 108.5 mg GA/g dw (TPC) and 320.7 mg Trolox/g dw (AA). The experimental values were close to the predicted values, demonstrating the suitability of the model. Ultrasound-assisted extraction increased the AA of the extracts but not the TPC. Fifteen compounds were identified in the cultivar, with no differences between the two drying methods. The results obtained suggest that the analyzed cultivars, particularly the red ones, can be considered a natural source of powerful antioxidant compounds.
分析了冷冻干燥和热风干燥方法对不同品种玫瑰花瓣总酚含量、抗氧化活性（AA）及颜色的影响。两种方法对酚类物质含量和抗氧化活性的保留效果相似，但冷冻干燥在保留红色方面表现更佳。此外，通过Box-Behnken设计的响应面法对两个玫瑰品种（ 和 ）的总酚和抗氧化活性提取条件进行了优化。溶剂对总酚含量（TPC）和抗氧化活性有主要影响。选定的参数为38%乙醇、75℃和30分钟。在此条件下， 品种的预测值为189.3 mg GA/g干重（TPC）和535.6 mg Trolox/g干重（AA）， 品种的预测值为108.5 mg GA/g干重（TPC）和320.7 mg Trolox/g干重（AA）。实验值与预测值接近，表明该模型适用。超声辅助提取提高了提取物的抗氧化活性，但未提高总酚含量。在 品种中鉴定出15种化合物，两种干燥方法之间无差异。所得结果表明，所分析的品种，特别是红色品种，可被视为强大抗氧化化合物的天然来源。
