ABSTRACT

Rosa pimpinellifolia, commonly known as the burnet rose, has shown huge functional properties and industrial potential. In this present study, the convective drying process was optimized to enhance the quality, antioxidant activity, and phenolic compounds. The influence of drying conditions on the drying and rehydration kinetics and mathematical modeling of the R. pimpinellifolia fruit (black rose hips) were investigated. Response surface methodology was used to detect the optimum drying conditions (i.e. temperature and air velocity). The optimum operating conditions were 67.21°C and 1.75 m s⁻¹ providing maximum total phenolic compounds, total anthocyanin, DPPH radical scavenging and Ferric Reducing Antioxidant Power (FRAP) values of 1327 ± 5 mg GAE/100 g, 491 ± 2 mg c3g E/100 g, 110 ± 2 mmol TE/g and 698.00 ± 15 mmol ISE/g, respectively. The Page Model was the most fitted model to predict the drying kinetics. Vegas-gálves and Peleg models were the most effective to describe the rehydration kinetics. The rehydration was more efficient at 60°C compared to 20 and 40°C. The convective drying increased hardness, cohesiveness, gumminess, and chewiness while decreasing springiness and resilience. Catechin, epicatechin, quercetin-3-glucoside, protocatechuic acid, chlorogenic acid, quercetin, rutin, fumaric acid, and gallic acid were the major phenolic compounds identified. The drying process thus improved the quality, antioxidant activity, and overall phenolic compounds of R. pimpinellifolia.

摘要

Rosa pimpinellifolia，俗称地榆，已显示出巨大的功能特性和工业潜力。在本研究中，对流干燥过程进行了优化，以提高质量、抗氧化活性和酚类化合物。研究了干燥条件对R. pimpinellifolia果实（黑玫瑰果）的干燥和再水化动力学和数学模型的影响。响应面方法用于检测最佳干燥条件（即温度和空气速度）。最佳操作条件为 67.21°C 和 1.75 ms ^-1提供最大总酚类化合物、总花青素、DPPH 自由基清除和铁还原抗氧化能力 (FRAP) 值 1327 ± 5 mg GAE/100 g、491 ± 2 mg c3g E/100 g、110 ± 2 mmol TE/g 和 698.00分别为± 15 mmol ISE/g。Page 模型是最适合预测干燥动力学的模型。Vegas-gálves 和 Peleg 模型最有效地描述了再水化动力学。与 20 和 40°C 相比，60°C 下的再水化效率更高。对流干燥增加了硬度、内聚性、粘性和咀嚼性，同时降低了弹性和回弹性。儿茶素、表儿茶素、槲皮素-3-葡萄糖苷、原儿茶酸、绿原酸、槲皮素、芦丁、富马酸和没食子酸是鉴定的主要酚类化合物。干燥过程因此提高了质量、抗氧化活性、R. pimpinellifolia。