# US 10,501,705 B2 · Method of processing edible oil

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- Number: US 10,501,705 B2
- Document ID: US10501705B2
- Status: Granted
- Kind: B2
- Application number: 15/735,559
- Filed: 2015-06-13
- Published: 2018-12-13
- Granted: 2019-12-10
- Earliest claimed: 2015-06-13
- Assignees: Jiangsu Dehe Biotechnology Co., Ltd.
- Applicants: Jiangsu Fusheng Biotechnology Co. Ltd; Shiming Li
- Inventors: Shiming Li; Jieyu Zhu; Dehe Liu; Xueyin Ren
- Web page: https://patentgrep.com/patent/US10501705B2

## CPC

- C11B 5/0092: {Mixtures}
- A23D 7/0053: {Compositions other than spreads}
- A23D 9/007: characterised by ingredients other than fatty acid triglycerides
- A23D 9/02: characterised by the production or working-up
- C11B 5/0085: {Substances of natural origin of unknown constitution, f.i. plant extracts}
- C11B: PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES (drying-oils C09F)
- A23D: EDIBLE OILS OR FATS, e.g. MARGARINES, SHORTENINGS OR COOKING OILS (preservation thereof A23B20/00; production, refinement or preservation of animal or vegetable fats or oils C11B, C11C)

## Abstract

This invention provides a method of using hydrophilic natural antioxidants to improve or preserve oxidative stability of edible oil. The method has been shown to be effective in reducing peroxide values of edible oil over a storage period. As such, it is suitable and safe for wide use in edible oil products.

## Claims

### Claim 1

A method for improving oxidative stability of edible oil, the method comprising:
mixing at least one hydrophilic natural antioxidant in a high polarity oil at a temperature of 25-40° C. to obtain an antioxidant oil mixture containing the hydrophilic natural antioxidant 0.04-50 wt;
mixing the antioxidant oil mixture in the edible oil so that the hydrophilic natural antioxidant has a concentration of 10-1000 ppm by weight,
wherein the hydrophilic natural antioxidant is epigallocatechin gallate (EGCG) or carnosic acid.

### Claim 2 (depends on 1)

The method of claim 1, further comprising pretreating the edible oil to remove polar oxidized components therein before mixing with the antioxidant oil, mixture, wherein the pretreating comprises:
filtering the edible oil through silica gel chromatography;
applying a nonpolar volatile solvent to elute the edible Rom the silica gel; and
removing the nonpolar volatile solvent from the edible oil by evaporation.

### Claim 3 (depends on 2)

The method of claim 2, wherein the edible oil is fish oil.

### Claim 4 (depends on 2)

The method of claim 2, wherein the nonpolar volatile solvent is hexane.

### Claim 5 (depends on 2)

The method of claim 2, wherein a volume ratio of silica gel to the edible oil is 1:1 to 1:20.

### Claim 6 (depends on 1)

The method of claim 1, wherein the edible oil is soybean oil.

### Claim 7 (depends on 1)

The method of claim 1, wherein the antioxidant oil mixture is a solution.

### Claim 8 (depends on 7)

The method of claim 7, wherein the high polarity oil is propylene glycol caprylate.

### Claim 9 (depends on 1)

The method of claim 1, wherein the antioxidant oil mixture is an emulsion.

### Claim 10 (depends on 1)

The method of claim 1, wherein the antioxidant oil mixture contains the hydrophilic natural antioxidant 0.04-20 wt %.

### Claim 11 (depends on 1)

The method of claim 1, wherein after mixing the antioxidant oil mixture in the edible oil, the hydrophilic natural antioxidant has a concentration of 100-200 ppm by weight.

### Claim 12

A method for improving oxidative stability of edible oil, the method comprising:
mixing a hydrophilic natural antioxidant in a high polarity oil at a temperature of 5-200° C. to obtain an antioxidant oil mixture containing the hydrophilic natural antioxidant 0.04-50 wt %;
mixing the antioxidant oil mixture in the edible oil so that the hydrophilic natural antioxidant has a concentration of 10-1000 ppm by weight,
wherein the hydrophilic natural antioxidant is carnosic acid.

### Claim 13 (depends on 1)

The method of claim 1, wherein the high polarity oil is propylene glycol caprylate, medium chain monoglyceride, or medium chain triglyceride.

### Claim 14 (depends on 13)

The method of claim 13, wherein the medium chain triglyceride is caprylic triglyceride.

### Claim 15 (depends on 1)

The method of claim 1, wherein the mixing at least one hydrophilic natural antioxidant in the high polarity oil is performed under ultrasonication.