Huertas-Alonso Alberto J, Gavahian Mohsen, González-Serrano Diego J, Hadidi Milad, Salgado-Ramos Manuel, Sánchez-Verdú M Prado, Simirgiotis Mario J, Barba Francisco J, Franco Daniel, Lorenzo José M, Moreno Andrés
Department of Organic Chemistry, Faculty of Chemical Sciences and Technologies (San Alberto Magno Building), University of Castilla-La Mancha, Av. Camilo José Cela, 10, 13071 Ciudad Real, Spain.
Department of Food Science, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, Taiwan.
Antioxidants (Basel). 2021 Oct 21;10(11):1652. doi: 10.3390/antiox10111652.
The table olive industry is producing a huge amount of wastewater, which is a post-processing cost and an environmental concern. The present study aims to valorize this processing by-product to obtain a value-added product, thereby enhancing resource efficiency and contributing to achieving sustainable development goals (SDGs). In this sense, a chemical reaction-based platform was developed to obtain valuable components, such as levulinic acid (LA) and 5-hydromethylfurfural (HMF). The products were then analyzed using NMR identification of the antioxidant phenolic fraction and microwave single-phase reaction of the sugary fraction. According to the results, the highest concentration of phenolic compounds does not correspond to the sample directly obtained from NaOH treatment (S1), indicating that water washing steps (S2-S5) are fundamental to recover phenolic substances. Moreover, glucose was presented in the sugary fraction that can be transformed into levulinic acid by a single-phase reaction under microwave irradiation. The information provided in this manuscript suggests that the wastewater from the olive processing industry can be valorized to obtain valuable products.
油橄榄加工业产生大量废水，这既是一种后处理成本，也是一个环境问题。本研究旨在使这种加工副产物增值，以获得高附加值产品，从而提高资源利用效率并助力实现可持续发展目标（SDGs）。从这个意义上讲，开发了一个基于化学反应的平台来获取有价值的成分，如乙酰丙酸（LA）和5-羟甲基糠醛（HMF）。然后使用抗氧化酚类馏分的核磁共振鉴定和含糖馏分的微波单相反应对产物进行分析。根据结果，酚类化合物的最高浓度并不对应于直接由氢氧化钠处理得到的样品（S1），这表明水洗步骤（S2-S5）对于回收酚类物质至关重要。此外，含糖馏分中存在葡萄糖，其可在微波辐射下通过单相反应转化为乙酰丙酸。本手稿提供的信息表明，橄榄加工业产生的废水可以增值以获得有价值的产品。
