Preparation method of highland barley germ oil flash extraction

Abstract

The invention provides a method for preparing highland barley germ oil by flash extraction. The method has the following advantages that (1) the highland barley germ oil is obtained through the steps of pretreatment on highland barley germs, refrigeration on the germs for later use, flash extraction, plate-and-frame filtration, and multistage flash distillation desolvation on filtrate; the extraction speed of the highland barley germ oil is high and extraction can be finished once every 0.5-1.5 minutes; (2) the yield and the extraction rate of the highland barley germ oil are high and respectively reach over 8% and over 98%; besides, the residual rate of oil in highland barley germ cakes is low and lower than 0.5%; (3) the residual rate of solvents in the highland barley germ oil is very low, and the residual rate of alcohol or acetone is lower than 8mg / kg which is far superior to the national standard residue limit (<=50mg / kg) of solvents in edible oil; (4) the other effective active components such as Vitamin E, Vitamin D and oryzanol in the highland barley germs are also extracted along with the oil; according to the different active components, the extraction rate reaches over 52%; the nutrition and health-care values of the highland barley germ oil are enhanced.

Description

technical field [0001] The invention relates to a method for extracting highland barley germ oil, in particular to a preparation method for flash extraction of highland barley germ oil. Background technique [0002] Highland barley is a variety of barley, commonly known as naked barley, also known as Yuanmai, which belongs to the grass family. Green naked is an essential staple food for the survival of the Tibetan people. It shows unique cultural value in Tibetan culture and has the typical characteristics of "three highs and two lows" (high protein, high fiber, high vitamins, low fat and low sugar). Contains β-glucan, tocopherol and flavonoids with unique physiological activity. According to the "Compendium of Materia Medica Supplements", highland barley is used as medicine, which has a salty taste and a cool nature; According to the "Chinese Tibetan Materia Medica" records: highland barley can clear lung heat, relieve stomach fire, smooth Qi, and strengthen yang. Highla...

AI Technical Summary

Problems solved by technology

[0005] In summary, there are still the following problems in the methods of producing highland barley germ oil at home and abroad: (1) supercritical carbon dioxide extraction method, the quality of highland barley bran oil is good, and the extraction rate is high, but the equipment is expensive and the extraction time is long (generally 1 (2-4 hours per time), so the production cost is high; (2) solvent extraction, whether it is pure solvent extraction, or microwave and ultrasonic assisted solvent extraction, the extraction time is longer (1-16 hours), the extracted crude oil It still needs to be processed, the process is complicated, the quality of highland barley bran oil is poor, and the yield is not high; (3) The traditional pressing method has simple process, low cost, and is easy to mass-produce, but the residual oil rate of the cake is high, and the highland barley bran oil Low oil yield, waste of resources