Improved extraction of avocado oil by application of sono-physical processes

Abstract

Ultrasound treatment is known to increase the oil extractability in olive and palm oil processes. This work examined the effect of ultrasound conditioning of avocado puree on oil extractability and quality, at low (18+40kHz) and high (2MHz) frequencies, at litre-scale. Other ultrasound parameters evaluated included high frequency effect (0.4, 0.6, and 2MHz; 5min; 90kJ/kg) and sonication time (2.5-10min at 2MHz), without malaxation. Finally, a megasonic post-malaxation intervention was assessed at selected malaxation times (15, 30, and 60min). Both low and high frequency ultrasound treatments of the non-malaxed avocado puree improved extractability by 15-24% additional oil recovery, with the highest extractability achieved after 2MHz treatments, depending on the fruit maturity and oil content. There was no preferential improvement on oil extractability observed across high frequencies, even though extractability increased with sonication time. Ultrasound treatment also showed a positive effect after puree malaxation. Oils obtained from sonicated purees showed peroxide and free fatty acid values below the industrial specification levels and an increase in total phenolic compounds after 2MHz treatment. High frequency ultrasound conditioning of avocado puree can enhance oil separation and potentially decrease the malaxation time in industrial processes without impacting on oil quality.

Optimising the Spray Drying of Avocado Wastewater and Use of the Powder as a Food Preservative for Preventing Lipid Peroxidation

“…The extracted oils would then be refined, bleached, and deodorised to remove any undesirable organoleptic properties [ 4 , 5 ]. Recent advancements in avocado oil extraction have included ultrasound treatment and supercritical CO 2 methods [ 6 , 7 ]. Although successful and feasible, these technologies have yet to be commercialised.…”

Avocado Oil Extract Modulates Auditory Hair Cell Function through the Regulation of Amino Acid Biosynthesis Genes

“…Avocado has broad functional benefits, including anti-cancer, anti-inflammatory, anti-oxidant, and anti-microbial activity [8]. Specifically, avocado oil is rich in monounsaturated fatty acids, which are good for human health, and is considered a functional food [7,9,10]. Many beneficial effects of avocado oil have been reported; however, little is known about the potential efficacy of avocado oil on SNHL.…”

Influence of Extraction Process on Yield, Total Phenolic Content, and Antioxidant Properties of Avocado (Persea Americana Mill.) Oil and Stability Assessment

“…The pre-treatment of avocado puree with high frequency (2 MHz) ultrasound increased the oil yield and the quality of the oil, regarding PV and AV, was not compromised with an increase in total phenolic compounds. The efficiency of ultrasound treatment was greatly influenced by fruit maturity [17].…”

“…Several extraction methods have been reported for the recovery of avocado pulp oil, such as centrifugation, hot extraction with hexane, cold pressing, pressing with oven-dried pulp extraction with petroleum ether, ethanol extraction, sonophysical processes, simultaneous supercritical, supercritical CO 2 (SC), and CO 2 /ethanol mixture extraction [1,4,[15][16][17]. The extraction methods greatly influence the yield and quality of oil from any plant materials [18].…”