Specific Energy: A New Approach to Ultrasound-assisted Extraction of Natural Colorants

M. M. Strieder, E. K. Silva, M. Meireles
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引用次数: 20

Abstract

The demand for natural colorants has boosted the search for innovative technologies to obtain them. Ultrasound-assisted extraction (UAE) is one of the new green techniques that has been studied due to its process advantages that include high yields, short extraction times and nonutilization of elevated temperatures. However, a nonstandardization of the UAE variables complicates comparisons and hinders progress in the studies of this topic. In this review, the focus is the verification and discussion of which UAE process conditions authors have used to obtain natural colorants. Thus, it is possible to confirm that some authors used ultrasonic systems that are not appropriate for performing a good extraction, that some used a great amount of solvent and a long extraction time, and that researchers did not express the main variables (nominal power, extraction time and sample mass) as a function of the specific energy applied to processing. Therefore, it is possible to conclude that some studies using UAE were not conducted to obtain the best results, and the expression of the variables as a function of specific energy can generate a standardization, which facilitates comparison among the results obtained by the scientific community.
比能:超声辅助提取天然着色剂的新方法
对天然着色剂的需求推动了对获得它们的创新技术的探索。超声辅助提取(UAE)因其产率高、提取时间短、不需要高温等优点而成为近年来研究的绿色新技术之一。然而,阿联酋变量的非标准化使比较复杂化,并阻碍了该主题研究的进展。在这篇综述中,重点是验证和讨论作者使用了哪些UAE工艺条件来获得天然着色剂。因此,有可能确认一些作者使用的超声波系统不适合进行良好的提取,有些人使用了大量的溶剂和较长的提取时间,并且研究人员没有将主要变量(标称功率,提取时间和样品质量)表示为应用于处理的比能量的函数。因此,我们可以得出结论,有些使用UAE的研究没有得到最好的结果,并且将变量表示为比能的函数可以产生标准化,便于科学界得到的结果之间的比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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