Extraction of oil from main cultivars of walnut in Yunnan and comparison of the functional active ingredients with commercial walnut oil
To select the appropriate extraction process of Yunnan walnut oil,with the main cultivars of walnut in Yunnan as raw materials,walnut oil was prepared by hydraulic pressing,screw pressing and aqueous method respectively,and the physicochemical indexes and functional active ingredients of walnut oil obtained by three oil production methods were compared.The functional active ingredients of walnut oil extracted by aqueous method from three main cultivars'Yangpao''Santai''Xixiang'in Yunnan were compared with six commercial walnut oils.The results showed that the acid value,peroxide value,iodine value,saponification value,moisture and volatile matter content and fatty acid composition and content of the walnut oils extracted by aqueous method,hydraulic pressing and screw pressing were all in line with the requirements of the national standard.The contents of α-tocopherol,γ-tocopherol,squalene and β-sitosterol in walnut oil obtained by aqueous method were significantly higher than those in hydraulic pressed and screw pressed oils.The contents of α-tocopherol,γ-tocopherol,squalene,β-sitosterol,melatonin and β-carotene in walnut oil obtained by aqueous method were significantly higher than those in commercial walnut oils.Walnut oil with good quality and high functional active ingredients content can be obtained by aqueous method,and aqueous method can be used for the extraction of walnut oil from main cultivars in Yunnan.
Juglans sigillatawalnut oilaqueous methodfunctional active ingredient
NETL
NSTL
万方数据
维普
