Prepn of cold squeezed wild walnut oil

Abstract

The preparation process of cold squeezed wild walnut oil includes the following steps: sorting, washing, sterilizing; dewatering and cooling; separating kernel from shell; drying kernel at temperature lower than 45 deg.c; cold squeezing in a cold press and eliminating slag; depositing; cooling the oil below 0 deg.c to eliminate impurity; separating protein through heating to 40 deg.c, adding pure water of 3-5 wt% of oil while stirring, standing while maintaining the temperature to deposit for at least 3 hr and taking the supernatant walnut oil; decolorizing, deacidifying and deodorizing; and filtering. The cold squeezed wild walnut oil is clear and pure, and has the nutritious components in walnut maintained.

Description

technical field [0001] The invention relates to an edible oil and a processing method thereof, in particular to a preparation process of cold-pressed wild walnut oil. Background technique [0002] Walnut oil is rich in unsaturated fatty acids, the content of which is close to 80%. Among them, the content of linoleic acid and linolenic acid is the highest among other edible oils, and it is rich in various vitamins, calcium, magnesium and other trace elements, which can soften blood vessels, reduce Cholesterol content in the human body, preventing arteriosclerosis and thrombosis has a positive effect, and can also prevent and treat many common modern affluent diseases such as hypertension, hyperlipidemia, diabetes, obesity, etc. In developed countries, eating walnut oil has become a consumption trend. Designate it as space food. [0003] The usual walnut oil is steamed and hot-pressed at high temperature. It is easier to extract the oil by high-temperature pressing, but the c...

AI Technical Summary

Problems solved by technology

[0003] The usual walnut oil is steamed and hot-pressed at high temperature. It is easier to extract the oil by high-temperature pressing, but the crude oil produced has more impurities and needs to be treated by high-temperature and chemical methods. If the high-temperature time is too long, the product will form trans-acid oil. It is not conducive to human health; steam distilled oil is easy to hydrolyze, resulting in the formation of polymers of polyunsaturated fatty acids; it is easy to cause the loss and destruction of nutritional and beneficial substances such as vitamin E, carotene, phytosterols and trace elements in the oil, and denature proteins. The content of water-soluble protein has decreased significantly, which reduces the nutritional value and functional properties of walnut oil itself. Due to the large amount of impurities in crude oil, the workload and production cost of refined oil are increased.