Low-Temperature Continuous Phase Transition Extraction of Artemisia argyi Levi. et Vant. Oil and Its Composition Analysis
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Abstract:
A method was developed for extracting volatile oil from Artemisia argyi using low-temperature continuous phase transition extraction. Based on single-factor experiments, optimal extraction conditions were determined using response surface methodology to achieve the maximum yield as follows: extraction time of 73 min, extraction pressure of 0.45 MPa, and extraction temperature of 50 ℃. Under these conditions, the oil yield reached 4.65%, 3.98% and 3.87% higher than that observed using traditional supercritical CO2 extraction and steam distillation, respectively. The oil extracted using the proposed method was compared with that from the two traditional extraction methods using gas chromatography-mass spectrometry and infrared spectroscopy to detect major chemical composition and quality differences. The results revealed significant differences in the chemical compositions of A. argyi volatile oils obtained using different extraction methods. Thirty-two compounds were identified in the product of low-temperature continuous phase transition extraction, and the oil was mainly composed of volatile terpenoids and long-chain esters. Long-chain esters and alkanes were the major constituents of the oil obtained using supercritical CO2 extraction. Finally, the major components in the oil extracted via steam distillation were volatile terpenoids with low boiling points. All three oil products contained camphor, caryophyllene, palmitic acid, phytol, and linolenic acid. Sensory evaluation results revealed that the oil extracted via continuous phase transition had a high yield, good quality, strong fragrance, and high contents of active compounds, making it suitable for large-scale industrial production.
