Method for producing oil through hot pressing of walnuts and walnut oil rich in polyphenol

Abstract

The invention discloses a method for producing oil through hot pressing of walnuts and walnut oil rich in polyphenol. The method is characterized by comprising the following steps: cleaning walnut rawmaterials of which green skins are removed, and unshelling, thus obtaining walnut kernels; stirring walnut kernels ,obtaining walnut crude oil through an oil production technology; precipitating andfiltering the walnut crude oil, and refining walnut refined oil product. The method disclosed by the invention has the beneficial effects that a new technology of a walnut-to-oil technology is opened,waste of a walnut resource is reduced, an additional value of the walnut resource is favorably increased, and industrialization can be easily realized; oil pressing is carried out by adopting a cooking temperature being 100 to 200 DEG C, the oil extraction rate of the walnuts at 180 DEG C is the highest, but the content of squalene reaches a peak value when the cooking temperature is 160 DEG C, and the taste is better; when the cooking temperature excesses 160 DEG C, the walnuts have a burnt smell. During an oil production process, the oil extraction rate is high, the obtained walnut oil is high in contents of tocopherol, polyphenol and phytosterol, and the walnut oil has the strong fragrance of the walnuts.

Description

technical field

[0001] The invention relates to the technical field of preparation of walnut oil, in particular to walnut oil rich in polyphenols and its hot pressing oil production process. Background technique

[0002] Walnut, also known as walnut or Qiang peach, is a plant of the Juglandaceae Juglans genus. Walnuts are rich in nutrients, rich in protein, fat, carbohydrates, mineral elements and vitamins, and also have unique advantages in medicine and health care. Walnut oil can reduce oxidative stress in the body through its antioxidant capacity, thereby reducing hyperglycemia and the production of pro-inflammatory cytokines.

[0003] The oil content of walnut can reach 60-70%, ranking first among all woody oil plants, so it is called "oil depot on trees". And it is rich in unsaturated fatty acids, mainly linoleic acid, linolenic acid, oleic acid, etc., and also contains saturated fatty acids such as palmitic acid and stearic acid. In addition, walnut oil contains VA,...