Method for producing virgin walnut oil by utilizing juglans sigillata

Abstract

The invention discloses a method for producing virgin walnut oil by utilizing juglans sigillata. The method comprises the following steps: removing rotten fruits and diseased fruits of the juglans sigillata; after immersing with clean water, washing through a spraying type brush roller washing machine; drying walnuts through hot air at low temperature by adopting a gradient interval manner; separating shells and kernels by applying a rice polishing mill; separating to obtain kernel powder with a few of walnut kernels; covering the walnut kernel powder with oil cloth and conveying into a hydraulic oil press for pressing; then conveying meal into a spiral oil press and further pressing to obtain light yellow walnut oil; carrying out secondary filtering through a self-heating type plate-and-frame filtering machine, so as to obtain high-quality walnut oil. The method disclosed by the invention has the advantages of low production equipment cost, high efficiency and strong applicability; the oil residual rate of the meal is lower than 5 percent and the prepared walnut oil has a light yellow color and a rich walnut aroma; the acid value of the walnut oil is less than 0.8mg / g, and the content of copper, iron, arsenic, lead, aflatoxin B1, benzo(a) pyrene and the like is in a range required by national standards, so that the method is applicable to industrial production.

Description

technical field [0001] The invention relates to the technical field of food processing, in particular to a method for producing virgin walnut oil by using interleaved walnuts. Background technique [0002] The type of sandwich walnut (also known as sandwich walnut or double clip walnut), mostly grafted or seeded. Its properties are between the bubble walnut type and the iron walnut type, with deep engraving, thicker shell, tight suture line, more developed inner fold wall, and some protrusions wrap the protruding part of the kernel, making it difficult to remove the kernel as a whole. The kernel yield is between 35% and 50%, and the kernel oil content is high and the quality is good. Cotton walnuts mostly appear in areas with less sunlight such as Guizhou, and some scholars also believe that this is one of the reasons for the formation of cotton walnuts. [0003] Walnut oil is rich in polyunsaturated fatty acids, and its oil unsaturation is as high as more than 90%. It is ...

AI Technical Summary

Problems solved by technology

In recent years, wild iron walnuts have been pressed in Yunnan to obtain walnut oil. However, iron walnut shells are hard, difficult to break, and the separation effect of the shell and kernel is not good. Alkali refining, decolorization and other processes for refining will greatly damage the flavor of walnut oil and the vitamins and physiologically active substances in it

[0004] Cotton walnut is different from iron walnut. The core shell is thinner than iron walnut. It is processed according to the existing iron walnut shell kernel separation technology and pressing and refining process. After the shell kernel is crushed, the mixture is serious, and the separation effect is not good. Large loss, poor oil quality

Cotton walnuts are sold at a low price alone, and the market competitiveness is poor, resulting in low enthusiasm for harvesting by the local people

Because the appearance of cotton walnuts is not much different from that of ordinary soaked walnuts, very few local people harvested cotton walnuts and mixed them with soaked walnuts for sale, which seriously affected the quality reputation of local walnuts.