Subcritical low temperature extraction technology and its application in extracting seed oils

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Abstract
Seed oils are of increasing interest to research and industry because they are a renewable, relatively inexpensive resource, they have valuable mechanical and chemical properties, and they have considerable nutritional benefits. Besides the traditional oil extraction methods, subcritical low temperature extraction as an innovative, clean, and environmentally friendly technology has attracted considerable attention recently. This new technique has many excellent properties, such as low temperature and pressure, short time, better selectivity, environmental compatibility, process simplicity, and the elimination of residual solvent. This review describes the technique of subcritical low temperature extraction, and then focuses on the recent developments in this technology as it is being used for the extraction of various seed oils.Practical Applications: Majority seeds are generally discarded worldwide as food‐by‐product, even though they have high nutritional value. This analysis provides new ideas for food industry stakeholders concerned with high value utilization of by‐product produced during food processing. It also assessed the combined effects of different extraction methods on the quality of variety seed oils. To our knowledge, no reviews have been conducted on the application of subcritical low temperature technique in plant seed oil extraction. By providing information and insights, this article should facilitate development of subcritical low temperature extraction as an efficient means to extract and isolate substances from plant matrices that can be used in the production of functional foods, nutraceuticals, and pharmaceuticals.

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