A Novel Aqueous Extraction for Camellia Oil by Emulsified Oil: A Frozen/Thawed Method

Abstract

Emulsion is inevitable during the aqueous extraction of oil from oilseeds. In this study, a new aqueous extraction method for camellia oil is investigated. During the extraction, the emulsified oil is collected, frozen, and thawed, and the free oil is obtained (AEEF). The optimal processing conditions are as follows: three times as much water as camellia seed powder (w/w), grinding at 70 °C for 6 min, repeating 2 cycles to collect the emulsified oil; then the emulsified oil is frozen (−20 °C) /thawed (50 °C) for 2 cycles. The yield of camellia oil is 89.37 ± 0.51%, which is significantly higher (p < 0.05) than that of microwave‐assisted aqueous enzymatic extraction (MAAEE, 83.05 ± 1.14%), and is similar to that of cold press extraction (CPE, 90.85 ± 2.05%), as well as solvent extraction (SE) coupled with refining. Additionally, the total oxidation value (TOTOX) of the free oil extracted by using AEEF (AEEF‐Oil, 6.82 ± 0.12%) is significantly lower (p < 0.05) than those of MAAEE, CEP, or SE. In comparison to SE‐Oil and CEP‐Oil, AEEF‐Oil has higher (p < 0.05) contents of α‐tocopherol and squalene, and lower (p < 0.05) benzo(a)pyrene contents, and contains more favorable natural volatile compounds. The results indicate that the novel AEEF may be a promising aqueous extraction method. Practical Application: The novel aqueous extraction method for camellia oil by emulsified oil – frozen/thawed has acceptable oil yields. The obtained camellia oil has high levels of bioactive components, low contents of hazardous substances, and more characteristic volatile flavor compounds. AEEF is an improved aqueous extraction technology for edible oil without refining and using n‐hexane, which could be potentially applied in industrial production of camellia oil due to its safety, nutrition, and environment‐friendly treatments. Aqueous extraction is a promising technique for edible oil extraction from oilseeds. The novel technology of aqueous extraction for camellia oil through emulsified oil – frozen/thawed (AEEF) is investigated. In comparison to solvent extraction, cold press extraction, and microwave‐assisted aqueous enzymatic extraction of camellia oil, the obtained camellia oil by AEEF has an acceptable oil yield, high quality, and nutritional value. AEEF is a safe, simple and environmental‐friendly aqueous extraction technology.

The Effect of Different Extraction Methods on Extraction Yield, Physicochemical Properties, and Volatile Compounds from Field Muskmelon Seed Oil

“…The high residual oil rate of the oil cake caused by insufficient extrusion in this process was the main reason for the low extraction rate. A large amount of emulsion was produced when using AE, which affected the separation of free oil, resulting in a lower extraction rate [ 19 ].…”

“…The high residual oil rate of the oil cake caused by insufficient extrusion in this process was the main reason for the low extraction rate. A large amount of emulsion was produced when using AE, which affected the separation of free oil, resulting in a lower extraction rate [19]. There were relatively large differences in the oil quality indexes of the field muskmelon seed oil extracted by different methods (Table 1).…”

Adapting Clofazimine for Treatment of Cutaneous Tuberculosis by Using Self-Double-Emulsifying Drug Delivery Systems

“…Unrefined plant-based oils, cold-pressed or cold extracted, are not exposed to heat or chemical processes during manufacturing, and thus the components remain unaltered [ 166 , 167 , 168 , 169 , 170 ]. Naturally occurring sediments, such as wax, in unrefined plant-based oils may improve dermal occlusive effects that inhibit skin dehydration whilst providing prolonged contact time with the skin to improve drug delivery.…”

Fast 1H-NMR Species Differentiation Method for Camellia Seed Oils Applied to Spanish Ornamentals Plants. Comparison with Traditional Gas Chromatography

“…The quality of Camellia oil is greatly influenced by extraction technologies [54]. Coldpressing is generally one of the most common traditional methods to produce healthy Camellia oil [51].…”