Health-care rice oil and refining method thereof

Abstract

The invention provides health-care rice oil and a refining method thereof. The health-care rice oil is prepared from the following components in percentage by mass: 35% to 42% of oleic acid, 32% to 38% of linoleic acid, 2.1% to 2.5% of oryzanol, 0.1% to 0.2% of vitamin A, 0.2% to 0.4% of gamma-oryzanol, 0.5% to 2.0% of protease, 0.5% to 2.0% of serine, and the balance of saturated fatty acid. The refining method comprises the following steps of mixing rice crude oil and glycerin according to a mass ratio of 1 to (0.01 to 0.05), adding a magnetic nanometer catalyst to esterify, and magnetically stirring to extract the oleic acid, the linoleic acid, the oryzanol, the vitamin A and the gamma-oryzanol from the rice oil, so as to obtain a crude oil mixture; centrifuging, filtering, and separating primary rice oil containing a trace amount of magnetic nanometer catalyst; using activated carbon to discolor, separating the trace amount of magnetic nanometer catalyst in a magnetic field, and adding the protease and the serine, so as to obtain the health-care rice oil.

Description

technical field [0001] The invention belongs to the technical field of oil deep processing, and relates to a health-care rice oil and a refining method thereof. Background technique [0002] Rice oil, commonly known as rice bran oil, is a by-product of rice peeling during the whitening process. Crude oil is obtained by pressing or leaching, and then further refined (physical or chemical refining). Due to the high degree of unsaturation of its fatty acid composition, it contains about 38% linoleic acid and about 42% oleic acid. The ratio of linoleic acid to oleic acid is about 1:1.1, and it is rich in oryzanol, sterols, and tocopherols , squalene and other biologically active substances are beneficial to the absorption of the human body, and have the functions of removing cholesterol in the blood, lowering blood lipids, preventing cardiovascular diseases, anti-oxidation, anti-aging, enhancing immunity, and promoting human growth and development, and have become domestic Inte...

AI Technical Summary

Problems solved by technology

Its shortcoming is that alkali refining not only causes a large loss of neutral oil and produces a large amount of waste water, but also greatly reduces the content of oryzanol, so that the content of oryzanol in the product rice oil is extremely low, and the nutritional value is greatly reduced; Physical deacidification The disadvantage is high energy consumption, and at the same time, it is easy to produce trans fatty acids in the long-term high-temperature process, which is potentially harmful to human health.

In the conventional refining process of rice oil, white clay adsorption is usually used for decolorization. The disadvantage is that in addition to the loss of neutral oil, the further harmless treatment of bleaching soil is also a great burden for manufacturers.

In addition, the color of decolorized rice oil is difficult to meet the standard of GB19112-2003 first-grade oil, which is why most of the rice bran oil on the market is fourth-grade oil

For example, the Chinese patent applications whose publication numbers are CN101455242A and CN102690723A disclose that first-grade edible rice bran oil can be obtained by refining rice bran crude oil, but because the deacidification temperature is high, and the patent application CN101455242A uses two alkali refining processes, the Tocopherols, sterols, oryzanol and other nutrients in rice bran oil are greatly lost

[0005] It can be seen from the above that due to the influence of temperature and alkali environment in the refining process of rice crude oil, the linoleic acid, linolenic acid, and arachidonic acid in it are easily oxidized, and the nutrients such as tocopherol, sterol, and oryzanol are greatly lost.

In addition, rice oil is prone to oxidative denaturation during storage, loses its health care function, and does not have antioxidant capacity