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| Process optimization of low temperature screw pressed walnut oil and its nutritional components analysis |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.230547 |
| KeyWord:walnut oil low temperature screw pressing response surface fatty acid composition active components |
| FundProject:浙江省中西医结合肿瘤防治技术研究重点实验室开放课题基金（202208CL）；浙江省农业科学院成果示范推广项目 |
| Author Name | Affiliation | | LU Hongling1，YU Ganglei2，JIANG Qihong1，JIANG Chenkai1，HU Wenjun1，
LUO Hongyang2，XIANG Xingwei3，FENG Yongcai4，SHEN Guoxin1，CHEN Lin1 | 1.Institute of Sericultural and Tea, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
2.Dongyang Forestry Bureau， Jinhua 322100， Zhejiang，China
3.College of Food Science and
Technology, Zhejiang University of Technology, Huzhou 313200, Zhejiang, China
4.Akesu Shoujiang Health Technology Co. , Ltd. , Akesu 842008, Xinjiang, China |
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| Abstract: |
| To promote the development and utilization of walnut oil, the low temperature screw pressing process conditions (moisture content of walnut kernels, pressing temperature, and outlet size) based on the walnut oil yield using single-factor experiments and response surface methodology were optimized. The fatty acid composition and active components of walnut oils from different varieties prepared under the optimal conditions were analyzed. The results indicated that the highest oil yield of 57.63% was achieved with an outlet size of 12 mm, a walnut kernel moisture content of 6%, and a pressing temperature of 100 ℃. The unsaturated fatty acid content in walnut oils from Xinjiang paper-shelled walnuts, American pecans, and Lin′an hickory nuts all exceeded 90%. Specifically, oleic acid content ranged from 18.08% to 63.44%, linoleic acid from 26.63% to 60.96%, and alpha-linolenic acid from 1.90% to 1145%. Squalene content in the three walnut oils was between 214.9 mg/kg and 282.1 mg/kg, total polyphenols content ranged from 20.2 mg/kg to 23.1 mg/kg, and vitamin E content varied from 2.68 mg/100 g to 13.31 mg/100 g, with the highest squalene and vitamin E contents found in American pecan oil. In conclusion, walnut oil with high yield and rich in various active ingredients can be obtained by low temperature screw pressing method. |
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