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| Effect of pretreatment method on salt-assisted aqueous extraction of Idesia polycarpa oil |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.230308 |
| KeyWord:Idesia polycarpa oil microwave pretreatment high-pressure pretreatment salt effect aqueous extraction method physicochemical property |
| FundProject: |
| Author Name | Affiliation | | WANG Xiaoyue, HU Xiao, LUO Guoliu, ZHONG Jinfeng, LIU Xiong, QIN Xiaoli | WANG Xiaoyue, HU Xiao, LUO Guoliu, ZHONG Jinfeng, LIU Xiong, QIN Xiaoli |
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| Abstract: |
| In order to explore an efficient method for extracting Idesia polycarpa oil for expanding the application of Idesia polycarpa oil, the Idesia polycarpa was pretreated by microwave or high-pressure, followed by salt-aqueous extraction of oil. The effects of liquid-solid ratio, NaCl mass concentration, extraction temperature, microwave pretreatment (power and time), and high-pressure pretreatment (temperature and time) on the extraction rate of Idesia polycarpa oil were investigated. Furthermore, using organic solvent extraction method as reference, the influence of microwave and high-pressure pretreatment on the extraction rate, physicochemical properties, color and DPPH radical scavenging rate of Idesia polycarpa oil extracted by salt -assisted aqueous method were studied.The results showed that the optimal conditions for the extraction of Idesia polycarpa oil by microwave pretreatment synergistic salt-assisted aqueous extraction method were microwave power 420 W, microwave time 90 s, liquid-solid ratio 1.2∶ 1, NaCl mass concentration 0.15 g/mL, and extraction temperature 50 ℃. The oil extraction rate of microwave pretreatment synergistic salt-assisted aqueous extraction method was 87.07%, which was 2.86% higher than that of high-pressure pretreatment synergistic salt-assisted aqueous extraction method with the temperature 110 ℃ and time 5 min. The microwave pretreatment synergistic salt-assisted aqueous extraction method resulted in relatively higher DPPH radical scavenging rate (83.03%) and lower acid value (10.73 mgKOH/g) of Idesia polycarpa oil compared with the high-pressure pretreatment method. There was no significant difference in fatty acid composition and peroxide value of Idesia polycarpa oil extracted by the two methods. In addition, the oil extraction rate of salt-assisted aqueous extraction method was lower than that of organic solvent extraction method,but had higher DPPH radical scavenging rate, lower thiobarbituric acid value, higher transparency and lighter red color of Idesia polycarpa oil. To sum up,microwave pretreatment synergistic salt-assisted aqueous method can effectively extract Idesia polycarpa oil, with high oil extraction rate and good oil quality, which can be used in the production of high quality Idesia polycarpa oil. |
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