Simplified preparation technology of rice oil

Abstract

A simplified preparation technology of rice oil belongs to the grain oil processing field. The simplified preparation technology provided by the invention comprises the following steps of: firstly, rice bran sold in the market is taken as a raw material and undergoes a microwave irradiation pretreatment to reduce the activity of lipolytic enzyme ; secondly, the rice bran undergoes the supercritical CO2 fractional extraction to obtain crude rice bran oil, followed by refining crude rice bran oil produced during the later period with the use of diethanolamine; thirdly, separating to obtain oil phase, washing and drying to obtain the finished product rice oil. The integrated application of microwave irradiation, supercritical fluid fractional extraction and diethanolamine refining method can simplify traditional preparation technology of rice oil and reduce the loss of neutral oil and oryzanol in the refining process. The rice oil product prepared by the technology has a unique fragrance of baked food with clear, transparent and light yellow grease; after the integrated processing, the acid value can be reduced below 1.0mgKOH / g, the content of phosphor is lower than 5mg / kg, the content of oryzanol reaches over 1.70%, and the chromaticity meets the national quality standard of leaching finished rice oil products.

Description

Technical field [0001] The invention relates to a simplified rice bran oil preparation process, which belongs to the field of grain and oil processing. Background technique [0002] Rice bran oil is called "youth oil". The ratio of saturated fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids is close to the optimal fatty acid intake ratio recommended by the American Heart Association and the World Health Organization of 1:2.1:1.1. It is rich in dozens of natural biologically active ingredients such as tocopherols, phytosterols and oryzanol. It has good health functions on the human body and is deeply loved by consumers. [0003] At present, the method used in rice bran oil factories is the traditional pressing method or solvent extraction method, but both of them have the problems of deep color, high acid value and high content of impurities. To obtain edible rice bran oil, it needs to go through Physical refining or chemical refining. Since traditional phy...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods used in rice bran oil factories are the traditional pressing method or solvent extraction method, but both of them have the problems of deep color of rice bran crude oil, high acid value and high impurity content. To obtain edible rice bran oil, it needs to go through physical refining or chemical refining

Since the traditional physical and chemical refining methods require the steps of deacidification, degumming, dewaxing, decolorization and deodorization, the complex production process will lose more nutrients and increase the production cost

[0004] In recent years, there have been more and more studies on supercritical fluid extraction of rice bran oil, but for rice bran, which is often difficult to guarantee the freshness in practice, the high acid value rice bran oil obtained by supercritical fluid extraction still needs further refining; In terms of process research, there are many optimization schemes for a single refining step, but less research on simplifying the entire refining process

Diethanolamine refining method has a small number of reports at home and abroad now, and its outstanding advantage of retaining oryzanol is worthy of attention. In Chinese patent CN101066074, a method for refining rice bran oil with diethanolamine has been announced. Its weak points have the following points: one is refining The second is that the acid value of the finished rice bran oil is around 6.0mgKOH / g, which is far from the country of the fourth-grade finished rice bran oil (acid value ≤ 3.0mgKOH / g) and the third-grade finished rice bran oil (acid value ≤ 1.0mgKOH / g). Standard (GB19112-2003 rice bran oil) still has a big gap

How to integrate the existing technology, set the process parameters for the preparation of high-quality rice bran oil, so as to simplify the research of the whole rice bran oil preparation process is still in the blank