CN106306114A - Coixseed bran oil microcapsule and preparation method thereof - Google Patents

Abstract

The invention discloses a barley bran oil microcapsule and a preparation method thereof, which is a microcapsule made by embedding barley bran oil with a wall material, and the mass of the wall material accounts for 70% to 75% of the mass of the barley bran oil microcapsule; The wall material is made of gum arabic and maltodextrin. Among the raw materials of the wall material, the gum arabic accounts for 40%-45% and the maltodextrin accounts for 50%-55% by mass percentage. The preparation method comprises the steps of preparation of wall material solution, preparation of wall material primary emulsion, preparation of microcapsule emulsion, spray drying and the like. The present invention makes full use of the emulsifying properties of gum arabic without adding emulsifiers and organic solvents, changes the addition sequence of wall materials and core materials, and adopts a spray drying method to prepare microcapsules. The prepared microcapsules have strong stability, High embedding rate.

Description

A kind of barley bran oil microcapsule and preparation method thereof

technical field

The invention relates to a barley bran oil microcapsule and a preparation method thereof, belonging to the field of microcapsule preparation in food processing technology.

Background technique

Barley bran is the external substance removed when barley is processed into polished rice, that is, the seed coat of coix seed, which accounts for 6%-10% of the total mass of barley, and the oil content is 20%-25%, which is much higher than that of coix seed , but it has been regarded as cheap animal feed and has not been fully utilized, which not only caused a great waste of barley bran resources, but also affected the deep processing and utilization of agricultural and sideline products. At present, there are few studies on barley bran. Existing studies show that barley bran oil is rich in a variety of unsaturated fatty acids and bioactive components, including phytosterols, alkanols, oleoyl, lactams and flavonoids and other functional active ingredients , has anti-cancer, anti-tumor, anti-inflammatory, anti-oxidation and hypoglycemic effects.

Microcapsule technology is an embedding technology, which is to embed dispersed solids, liquids or gases to form particles; it is intended to protect sensitive materials, improve material processing characteristics and control their release during storage and use. After the barley bran oil is prepared into microcapsule powder, under the protection of the outer dense film, the damage to the barley bran oil by the external environment (such as O2, pH, moisture, temperature, etc.) is reduced, especially the oxidation damage, which greatly improves the barley bran oil. Storage stability. In addition, barley bran oil changes from liquid to solid after microencapsulation, which is convenient for processing, transportation and storage, and the product has good water solubility and convenient weighing, which broadens the application range of barley bran oil.

In the existing technology, most of the research on oil microcapsules adopts the method of adding organic solvent or emulsifier to process the oil phase to make it merge with the water phase, but the organic solvent is easy to destroy the active substances and fragrance components in the oil, and the latest Studies have shown that the use of emulsifiers can change the intestinal flora of rats and cause obesity in rats. At present, there is no relatively mature related prior art for barley bran oil microcapsules.

Contents of the invention

The object of the present invention is to provide a barley bran oil microcapsule and a preparation method thereof without adding an emulsifier, to solve the problem of oxidative rancidity of the barley bran oil in production, storage, transportation and circulation, and to improve the stability of the product. broaden its scope of application.

The present invention realizes this object through following technical scheme:

First of all, the present invention proposes a barley bran oil microcapsule, which is a microcapsule made by embedding barley bran oil with a wall material, wherein the wall material accounts for 70% to 75% of the barley bran oil microcapsule mass; the wall material is composed of It is made of gum arabic and maltodextrin. Among the wall material raw materials, by mass percentage, the gum arabic accounts for 40%-45%, and the maltodextrin accounts for 50%-55%.

The preparation method of the barley bran oil microcapsules comprises the following steps:

(1) Preparation of wall material solution: add gum arabic into hot water at 60-70°C, stir and dissolve, and prepare wall material solution;

(2) Preparation of wall material primary emulsion: add barley bran oil to the wall material solution obtained in step (1), keep the temperature at 40-60°C, stir and emulsify for 10-15 minutes, and then press the ratio of gum arabic and maltodextrin Add maltodextrin as a wall material filler, stir and emulsify for 15 to 20 minutes to prepare a wall material primary emulsion; first add barley bran oil to form a primary emulsion and then add maltodextrin, the purpose is to make full use of the emulsifying properties of gum arabic, Enhance the stability of microcapsules while avoiding the addition of emulsifiers.

(3) Preparation of microcapsule emulsion: the wall material primary emulsion prepared in step (2) is sheared at a speed of 20000r/min for 8 to 10 minutes with a high-speed disperser, and the emulsion is cooled to room temperature, and then used The high-speed disperser shears at a speed of 10000r/min for 10 minutes, and then homogenizes the microcapsule emulsion twice under a pressure of 30-40Mpa;

(4) Spray drying: the microcapsule emulsion prepared in step (3) is spray-dried; the air inlet temperature of the spray drier is controlled at 180°C, the air outlet temperature is 80-90°C, and the sample flow rate is 4ml/min , Stirring and injecting samples under normal pressure and normal temperature conditions to prepare barley bran oil microcapsules.

Wherein, the amount of water used in the step (1) is 1.8 to 2.3 times the total weight of the three raw materials of gum arabic, maltodextrin and barley bran oil in the microcapsules.

Beneficial effects of the present invention: (1) The present invention uses barley bran oil as a raw material to prepare barley bran oil microcapsules, "turns waste into treasure", has sufficient resources, and solves the problems of deep processing of barley products, storage and transportation of barley bran oil, rancidity and oxidation, At the same time, the application range of barley bran oil is expanded. (2) The present invention makes full use of the emulsifying property of gum arabic under the condition of not adding emulsifier and organic solvent, changes the addition order of wall material and core material, adopts spray drying method to prepare microcapsules, and the microcapsules that it makes are stable Strong, high embedding rate.

detailed description

In order to deepen the understanding of the present invention, the present invention will be described in further detail below in conjunction with examples, which are only used to explain the present invention, and do not constitute a limitation to the protection scope of the present invention. If the modifications or improvements made on the basis of the present invention are obvious to those skilled in the art, they shall belong to the protection scope of the present invention. In the following content, if quantity or ratio is involved, unless otherwise specified, it refers to mass unit or mass ratio.

Example 1:

(1) Weigh 11.67g of gum arabic, put it in a 200ml beaker, add 65ml of distilled water, and stir until completely dissolved in a water bath at 60°C to make a wall material solution.

(2) Weigh 8.75g barley bran oil, slowly add it into the gum arabic wall material solution while stirring, then use a 600rpm water bath magnetic stirrer to stir and emulsify for 10-15 minutes at 40-60 degrees Celsius, and then add 14.58g Maltodextrin is used as a wall material filler, stirred and emulsified for 15 to 20 minutes, and prepared into a wall material primary emulsion.

(3) Use a high-speed disperser to homogenize the primary emulsion at a speed of 20,000r/min for 8 to 10 minutes, stay for a period of time to cool the emulsion to room temperature, and then use a high-speed disperser to homogenize at a speed of 10,000r/min for 10 minutes. Then homogenize twice under the pressure of 30-40Mpa to prepare the microcapsule emulsion.

(4) The above-mentioned microcapsule emulsion is spray-dried under the condition that the air inlet temperature is 180 degrees Celsius, the air outlet temperature is 80-90 degrees Celsius, and the injection flow rate is 4ml/min, to obtain the barley bran oil microcapsules. The embedding rate of barley bran oil microcapsules was 87.46%.

Determination of surface oil content: Weigh 2.0000g of microencapsulated barley bran essential oil, spread it on the Buchner funnel, wash it with 20mL petroleum ether (boiling range 30--60℃) for 1min, filter it, and divide it into two parts with 20mL petroleum ether. Wash the filter paper and Buchner funnel once. Combine the filtrates into a 50ml Erlenmeyer flask with constant weight, evaporate the petroleum ether to dryness in a water bath at 65°C, then place the Erlenmeyer flask in an oven at 103°C, and dry it to constant weight.

Surface oil content = surface oil weight / sample weight × 100%

Determination of total oil content: Accurately weigh about 1 g (M) of the microencapsulated product, dissolve it in a 100 ml stoppered measuring cylinder several times with 10 ml of distilled water at 60 degrees Celsius, add 1.25 ml of ammonia water with a concentration of 25%, mix thoroughly and place Heat in a water bath at 60°C for 5 minutes, shake again for 2 minutes, then add 10ml of ethanol, shake well and cool in cold water, add 25ml of diethyl ether, shake for 0.5 minutes, add 25ml of petroleum ether (boiling range is 30-60°C ), then shake for 0.5 minutes, let it stand for 30 minutes to make it layered, read the volume (V) of the upper layer liquid, and use a pipette to suck out a certain volume (V ₁ ) of the supernatant to a small cone after constant weight In the bottle (M ₁ ), the solvent was evaporated in a water bath at 65 degrees Celsius, and the Erlenmeyer flask was placed in an oven at 103 degrees Celsius, and baked to a constant weight (M ₂ ).

Product embedding rate=(1-surface oil content/total oil content)×100%

Of course, the above are only specific application examples of the present invention, and there are other implementation modes in the present invention, and all technical solutions formed by equivalent replacement or transformation fall within the scope of protection required by the present invention.

Claims (3)

1. a Semen Coicis rice oil microcapsule, the microcapsule made with wall material embedding Semen Coicis rice oil, it is characterised in that: described wall material Quality accounts for the 70%～75% of this Semen Coicis rice oil microcapsule quality；Described wall material is made up of arabic gum and maltodextrin, at wall In material raw material, by mass percentage, arabic gum accounts for 40%～45%, and maltodextrin accounts for 50%～55%.

2. the preparation method of a Semen Coicis rice oil microcapsule as claimed in claim 1, it is characterised in that the method includes as follows Step:

(1) prepared by wall material solution: added by arabic gum in the hot water of 60～70 DEG C, and stirring and dissolving prepares wall material solution；

(2) prepared by wall material just emulsion: added by Semen Coicis rice oil in the wall material solution that step (1) obtains, temperature be maintained at 40～ 60 DEG C, stirring and emulsifying 10～15 minutes, then add maltodextrin as the filling of wall material in the ratio of arabic gum and maltodextrin Agent, stirring and emulsifying 15～20 minutes, prepare wall-forming material just emulsion；

(3) preparation of microcapsule emulsion: the wall material that step (2) is prepared just emulsion high speed disperser with The VELOCITY SHEAR 8 of 20000r/min～10 minutes, stop to emulsion and be cooled to room temperature, then with high speed disperser with 10000r/ The VELOCITY SHEAR of min 10 minutes, then under the pressure of 30～40Mpa, homogenizing prepares microcapsule emulsion for twice；

(4) it is spray-dried: the microcapsule emulsion that step (3) prepares is spray-dried；The air inlet temperature of spray dryer Degree controls at 180 DEG C, and air outlet temperature is 80～90 DEG C, and sample introduction flow is 4ml/min, stirs sample introduction under the conditions of normal pressure and temperature, Prepare Semen Coicis rice oil microcapsule.

The preparation method of Semen Coicis rice oil microcapsule the most according to claim 2, it is characterised in that: the use of water in step (1) Amount is arabic gum, maltodextrin and 1.8～2.3 times of three kinds of raw material gross weights of Semen Coicis rice oil in this microcapsule.