A kind of production method of low-temperature pressed Chinese torreya oil

Abstract

The invention discloses a method for manufacturing torreya grandis oil through low temperature squeezing. The method comprises the following steps: (1) collecting and hulling: performing decrustation, stack retting postripeness and drying on collected torreya grandis, removing hulls of obtained torreya grandis seeds to obtain torreya grandis seed kernels, and meanwhile, collecting the hulls of the torreya grandis seeds for later use; (2) cold drying: after selecting the torreya grandis seed kernels, performing solarization or cold drying on the selected torreya grandis seed kernels until the moisture content is equal to or less than 7%; (3) mechanical low-temperature squeezing: controlling the moisture content of the torreya grandis seed kernels within the range of 5 to 9%, mixing the torreya grandis seed kernels with the hulls of the torreya grandis seeds, and then conveying the mixture to a pressofiner to perform low temperature squeezing to obtain torreya grandis crude oil; (4) filtering and purifying: performing filter pressing on the torreya grandis crude oil to obtain squeezed oil; and (5) winterization: injecting the squeezed oil into a winterization pot, slowly cooling the squeezed oil to 4 DEG C to perform winterization, filtering obtained winterization oil, then repeating winterization once, and filtering to obtain torreya grandis product oil. According to the method disclosed by the invention, the processing steps are simple; the operability is strong; the loss of nutritional ingredients is less; the yield of extraction is high; and the squeezed oil is good in quality.

Description

technical field [0001] The invention relates to the technical field of edible vegetable oil preparation, in particular to a production method of low-temperature pressed Chinese torreya oil. Background technique [0002] Torreya grandis, (scientific name: Torreya grandisFort.ex Lindl.cv.Merrillii.), also known as Chinese torreya, is a relict plant of the Tertiary Period and belongs to the national second-class protected tree species. Torreya is native to my country and is a rare tree species unique to China. Torreya is classified as Taxaceae, Taxaceae, and Torreya is an evergreen tree plant. Torreya is mainly distributed in 10 provinces including Zhejiang, Jiangsu, Anhui, and Jiangxi in the south of the Yangtze River Basin in my country, and is concentrated in the Kuaiji Mountains. At present, torreya is mainly eaten as dried fruit, and commercialized dried fruit has higher requirements on the size and shape of torreya. In actual production, the use value of torreya that do...

AI Technical Summary

Problems solved by technology

This method is complex in operation, high in energy consumption, and the oil extraction rate is only about 34%;

[0006] (2) High-temperature steaming and frying and high-temperature pressing affect the quality of pressed oil, and may also produce some harmful and undesirable substances. When frying seeds at high temperature, once the temperature and stirring speed are not well controlled, there will be a risk of producing benzopyrene. During the process of high-temperature steaming and high-temperature pressing, the (poly)unsaturated fatty acids contained in Torreya citrus oil are decomposed, and many precious natural active and beneficial ingredients are lost or destroyed, and the content drops significantly;

[0007] (3) The torreya seed oil obtained by high-temperature pressing method has too dark crude oil color, high content of some solid impurities such as saponin, and has a certain astringent taste when eaten directly. Some indicators do not meet the national edible oil standards, so it must be processed and refined. before it becomes a commodity

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