Department of Food, Nutrition, and Health, College of Food and Agriculture, United Arab Emirates University, Al Ain, 15551, UAE.
University of Lyon, Université Claude Bernard Lyon 1, CNRS, LAGEPP UMR 5007, 43 Bd 11 Novembre 1918, 69622, Villeurbanne, France.
Sci Rep. 2020 Dec 10;10(1):21767. doi: 10.1038/s41598-020-78713-4.
Date fruits vary widely in the hardness of their edible parts and they are classified accordingly into soft, semi-dry, and dry varieties. Fruit texture, a significant parameter in determining consumer acceptance, is related to the tissue structure and chemical composition of the fruit, mainly the ratio of sucrose to reducing sugars. This study aimed to understand the relationship between the chemical composition, microstructure, and texture profile of 10 major Emirati date fruits. The soluble sugars, glucose and fructose, represent ca 80 g/100 g of the fruits on the basis of dry weight (DW) while the dietary fiber contents varied 5.2-7.4 g/100 dg D.W. with lignin being the main determinant of the variability. The textures of the samples were studied using instrumental texture profile analysis. While no correlation was found between the soluble sugar and texture parameters in this study, the different fiber constituents correlated variably with the different parameters of date fruit texture. Lignin, arabinoxylan, galactomannan, and pectin were found to correlate significantly with fruit hardness and the related parameters, gumminess and chewiness. Both lignin and arabinoxylan correlated with resilience, and arabinoxylan exhibited a strong correlation with cohesiveness.
椰枣的可食用部分的硬度差异很大,因此可分为软椰枣、半干椰枣和干椰枣三种类型。果实质地是决定消费者接受程度的一个重要参数,与果实的组织结构和化学成分有关,主要是蔗糖与还原糖的比例。本研究旨在了解 10 种主要阿联酋椰枣的化学组成、微观结构和质地特性之间的关系。可溶性糖(葡萄糖和果糖)在干重基础上约占果实的 80 g/100 g,而膳食纤维含量在 5.2-7.4 g/100 g DW 之间变化,木质素是造成这种差异的主要因素。使用仪器质地剖面分析研究了样品的质地。尽管在这项研究中没有发现可溶性糖与质地参数之间存在相关性,但不同的纤维成分与椰枣质地的不同参数之间存在不同的相关性。木质素、阿拉伯木聚糖、半乳甘露聚糖和果胶与果实硬度及其相关参数(胶粘性、咀嚼性)显著相关。木质素和阿拉伯木聚糖与弹性相关,阿拉伯木聚糖与内聚性具有很强的相关性。