Recent advances in the extraction methods of essential oils and oleoresins from plant materials and its potential applications: A comprehensive review

Due to the important role of bioactive secondary metabolites in cosmeceuticals, functional foods, nutraceuticals, therapeutics, and health care, more attention has been paid to the extraction of active components using efficient extraction methods. Efficient, economical, and promising extraction routes are essential for resource recovery without compromising the quality and efficacy of the extracted products for desired applications. The present review emphasizes the recent developments and improvements in extraction methods of essential oils and oleoresins that have been achieved through different and innovative processing techniques and their diverse applicability. Besides, the trends of extraction techniques, the effect on essential oil glands in different extractions, industrial relevance, and optimization design were found important to industry professionals in realizing wider possibilities for selecting suitable extraction methods and developing new sustainable bioactive compounds-based formulations. In addition, this review facilitates the academics to select the effective extraction method in their research as extraction is the first and crucial part of plant-based research. The study revealed that the extraction methods developed using the combinations of novel technologies such as microwave assisted, ultrasound assisted, enzyme assisted, and supercritical fluid extraction were effective and efficient for the extraction of both essential oils and oleoresins. The extracts' applications are widening due to the advance in the delivery systems, such as micro and nanoencapsulation technologies.