Department of Neurofarba, Nutraceutical Section, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Florence, Italy.
Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia.
Food Chem. 2022 Nov 30;395:133591. doi: 10.1016/j.foodchem.2022.133591. Epub 2022 Jun 28.
The study analysed polysaccharides and phenolic compounds in widely consumed but little studied date fruits varieties such as Sukkari, Ajwa, Segae, Barrny and Khalas harvested at Tamr stage. The total phenols were in similar amount in the five varieties and ranged from 20 to 50 mg/100 g DW. The decoction and successive centrifugation made it possible to collect two main polysaccharide fractions for all the selected fruits. For each variety the first fraction was more abundant, with a lower swelling capacity and a higher amount of galacturonic acid (28.3% to 40.1%). The second fraction was only soluble in alkaline solution, with an average galacturonic acid content of only 17%. The different structure of the two polysaccharide fractions was also confirmed by the composition in neutral sugars and the degrees of methylation and acetylation. The proposed extraction procedure could be applied for larger scale extraction of the date fruit polysaccharides.
这项研究分析了在 Tamr 期收获的广泛食用但研究甚少的几种枣果（如 Sukkari、Ajwa、Segae、Barrny 和 Khalas）中的多糖和酚类化合物。这五种品种的总酚含量相似，范围在 20 至 50mg/100gDW 之间。煎煮和连续离心使得可以为所有选定的水果收集两个主要的多糖级分。对于每种品种，第一种级分更丰富，溶胀能力较低，半乳糖醛酸含量较高（28.3%至 40.1%）。第二种级分仅可溶于碱性溶液，半乳糖醛酸含量平均仅为 17%。两种多糖级分的不同结构也通过中性糖组成和甲基化及乙酰化程度得到了证实。所提出的提取程序可应用于更大规模的枣果多糖提取。
