Ultrasound‐assisted extraction of oil from hempseed (Cannabis sativaL.): Part 1

Abstract

BACKGROUND Ultrasound‐assisted extraction of the intermediate product from the mechanical expression of hemp (Cannabis sativa L.) seed oil was investigated to improve the overall expression yield without compromising oil quality. Complementary ultrasound technology was used as an out‐of‐line treatment carried out at 20 kHz frequency and optimized with respect to amplitude (80 and 152 μm), sonication time (2, 10, 20 min) and to the hemp paste properties, in particular its particle size and hydration, which drive the compressibility of the press cake. RESULTS Under the conditions evaluated, the optimal ultrasound treatment was found to be the one applied on the hydrated press cake for 2 min at 152 μm, which resulted in an oil yield of 13.4%, with an increase in extraction efficiency equal to 73% with respect to the control (untreated press cake). Sonication had a positive effect on the press cake texture and on the extracted oil antioxidant activity. Soaked samples treated for 2 min at 152 μm yielded the lowest hardness. Oil recovered from soaked samples treated at 80 μm and 152 μm ultrasound for 2 min had the highest antioxidant capacity. CONCLUSIONS The technological results gathered in the present investigation are preliminary to the design and engineering of scaled‐up equipment that combines the mechanical screw expression and the in‐line ultrasound unit. © 2021 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

Postharvest Operations of Cannabis and Their Effect on Cannabinoid Content: A Review

“…Furthermore, Agarwal et al [ 106 ] concluded that ultrasound considerably improved the extraction of cannabinoids present in cannabis. Ultrasound also can increase the recovery of oil from cannabis [ 107 , 108 ]. Considering the above outcomes from the literature, ultrasound can be an important treatment for the cannabis industry to enhance the drying process and extraction of cannabinoids.…”

Ultrasound‐assisted extraction of oil from hempseed (Cannabis sativa L.): Part 2

“…The horn was placed at the centre of the vessel, with an immersion depth in the fluid of approximately 3 cm. Based on a series of preliminary tests, 14 which confirmed the experimental conditions of Metherel et al 31 and Hernández-Santos et al, 32 treatments were carried out at an ultrasound frequency of 20 kHz and amplitude of 152 μm for 5 min.…”

Supercritical Carbon Dioxide Technology for Recovering Valuable Phytochemicals from Cannabis sativa L. and Valorization of Its Biomass for Food Applications

“…Currently, a variety of alternative extraction processes, considered environmentally friendly, are available and can be selected depending on the desired extract type. For instance, microwave-assisted extraction (MAE) has been employed to obtain cannabinoids, phenolic compounds, and essential oils from cannabis [40][41][42]; ultrasound-assisted extraction (UAE) was used to produce extracts from cannabis containing cannabinoids, flavonoids, anthocyanin, stilbenoids, lignans, and oil [43][44][45][46]. In addition, high-pressure technologies, such as pressurized liquid extraction (PLE) and SFE, also have been largely employed.…”