Extraction of Avocado Peel Oil Using a Soxhlet Extractor and Investigation of Its Physicochemical Properties

Abstract

This study investigates the extraction of avocado peel oil from avocado peel using a soxhlet extractor at different extraction times, temperatures, and solvent to avocado peel ratios using hexane solvent. The time for extraction ranges from 2 to 5 h, the extraction temperature ranges from 60 to 70°C at a temperature deviation of ± 2°C, and the hexane to avocado peel ratio ranges from 4 to 5 ml/g. Thus, the study reveals that the maximum amount of 29.93% w/w avocado peel oil was extracted at 3 h of extraction, at the boiling point of hexane, and at a 5 ml/g of hexane to avocado peel ratio. For varying extraction temperatures at constant hexane to avocado peel ratio, the optimum avocado peel oil was obtained at 70 ± 2℃ extraction temperature and 4.5 h of extraction time. Finally, the obtained oil was characterized for its physicochemical properties, from which an acid value of 2.8 mg KOH/g of oil and a free fatty acid of 1.4% were obtained from the study.

Extraction, Production and Quality Evaluation of Margarine from Oil Extracted from Waste Biomass Peels of Avocado and Virgin Coconut Oil, Using Chitosan from Reared Shells as Preservative

“…The values for specific gravity of APO in this study ranged from 0.84 ± 0.0 to 0.9 ± 0.0 with APSB having the highest specific gravity. This is same as the value of specific gravity reported by [21]. The specific gravities of AO by Ogbaugu et al, 2020 was reported to be 0.86.…”

“…This value is close to the value of avocado oil (0.91 ± 0.01) reported by [20]. Generally, the values are higher as compared to the 0.90 reported by [21]. This could be due to the geographical factors affecting the growth and properties of the avocado pears.…”

“…The saponification values of the investigated APO were within the requirements of food domain, and varied from 149.6 ± 0.44 to 194.47 ± 1.32 mg KOH/g. generally, apart from sample APSA, the Saponification values of the APOs were lower than the results obtained by [21], who reported a value of 189.33 MgKOH/g in the extraction and characterization of APO.…”