Messadi Nesrine, Mechmeche Manel, Setti Khaoula, Tizemmour Zoulikha, Hamdi Moktar, Kachouri Faten
Laboratory of Innovation and Valorization for Sustainable Food Industry, Superior School of Food Industry at Tunis (ESIAT), University of Carthage, 58, Street Alain Savary, 1003 Tunis, Tunisia.
Laboratory Microbial Ecology and Technology (LETMI), National Institute of Applied Sciences and Technology (INSAT), University of Carthage, BP, 676, 1080 Tunis, Tunisia.
Sugar Tech. 2023;25(2):460-472. doi: 10.1007/s12355-022-01223-2. Epub 2022 Dec 8.
The response surface methodology (RSM) was used in order to select the extraction conditions of extract from Kentichi date powder; a by-product of the date-processing process. Powder/solvent ratio, extraction temperature, and extraction time all had an impact on sugar yield, and these model factors have quadratic effects influencing sugar yield. Optimal extraction was obtained with 300 g/L powder/solvent ratio, 32.7 °C extraction temperature, and 2.1 h extraction time. Under these conditions, Kentichi date powder's (KDP) sugar yield was 77.1%, which was close to the predicted value of the model (80.50%). The results of Kentichi date powder extract (KDPE) showed that the total sugar content is 160.09 g/L. However, the protein content is 10.31 g/L with a majority of the essential amino acids (essentially glutamic acid (28.39 mg/L) and aspartic acid (9.65 mg/L)). The determination of antioxidant activity of KDPE showed a high activity (DPPH IC = 4.8 mg/mL, ABTS IC = 3 mg/mL, FRAP = 4.70 μmol AAE/mL and, TAA = 18.04 μmol Fe(II)/mL). The results show also that the freeze-drying technique has a lot of potential for producing powder from KDPE with many desirable properties. The findings indicate that KDPE with a high nutritional value could be used as a component for the formulation of functional foods.
The online version contains supplementary material available at 10.1007/s12355-022-01223-2.
采用响应面法（RSM）来选择从海枣加工副产品海枣粉中提取提取物的条件。粉末/溶剂比、提取温度和提取时间均对糖产量有影响，这些模型因素对糖产量具有二次效应。在粉末/溶剂比为300 g/L、提取温度为32.7℃、提取时间为2.1 h的条件下获得了最佳提取效果。在此条件下，海枣粉（KDP）的糖产量为77.1%，接近模型预测值（80.50%）。海枣粉提取物（KDPE）的结果表明，总糖含量为160.09 g/L。然而，蛋白质含量为10.31 g/L，其中大多数为必需氨基酸（主要是谷氨酸（28.39 mg/L）和天冬氨酸（9.65 mg/L））。KDPE抗氧化活性的测定显示出高活性（DPPH IC = 4.8 mg/mL，ABTS IC = 3 mg/mL，FRAP = 4.70 μmol AAE/mL，TAA = 18.04 μmol Fe(II)/mL）。结果还表明，冷冻干燥技术在生产具有许多理想特性的KDPE粉末方面具有很大潜力。研究结果表明，具有高营养价值的KDPE可作为功能性食品配方的一种成分。
在线版本包含可在10.1007/s12355-022-01223-2获取的补充材料。
