阅读说明：本技术 一种纳米富氢牛奶及其制备方法 (Nano hydrogen-rich milk and preparation method thereof ) 是由 刘士磊 于 2021-08-02 设计创作，主要内容包括：本发明提供了一种纳米富氢牛奶及其制备方法。该制备方法包括：由原奶依次进行收奶处理、标准化处理、UHT灭菌处理,得到原奶料；将所述原奶料进行溶氢处理,经过无菌罐装,得到富含氢的牛奶。通过本发明的上述制备方法制备得到的富氢牛奶的溶氢浓度至少为10mg/L,非密封状态下80％的氢气浓度在牛奶中的停留时间至少为5小时。(The invention provides nano hydrogen-rich milk and a preparation method thereof. The preparation method comprises the following steps: carrying out milk collection treatment, standardization treatment and UHT sterilization treatment on raw milk in sequence to obtain a raw milk material; and (3) carrying out hydrogen dissolving treatment on the raw milk material, and carrying out aseptic canning to obtain the milk rich in hydrogen. The hydrogen-enriched milk prepared by the preparation method has the dissolved hydrogen concentration of at least 10mg/L, and the retention time of 80% hydrogen concentration in the milk in an unsealed state is at least 5 hours.)

1. A preparation method of nano hydrogen-rich milk comprises the following steps:

carrying out milk collection treatment, standardization treatment and UHT sterilization treatment on raw milk in sequence to obtain a raw milk material;

and (3) carrying out hydrogen dissolving treatment on the raw milk material, and carrying out aseptic canning to obtain the milk rich in hydrogen.

2. The production method according to claim 1, wherein the hydrogen dissolution treatment is performed in an aseptic tank.

3. The production method according to claim 1 or 2, wherein the hydrogen dissolving treatment comprises the steps of:

stirring milk in the aseptic tank at a speed of 25-35 r/min, and flushing 2800-3200L/min hydrogen into the aseptic tank through a molecular sieve to make the hydrogen flow channel in the aseptic tank nano-scale;

and stopping filling hydrogen when the pressure of the hydrogen in the aseptic tank reaches 3MPa, and keeping the pressure for 5-15 min to finish the hydrogen dissolving treatment.

4. The preparation method according to claim 1, wherein the nano molecular sieve has an average pore size of 18nm to 25 nm; preferably, the average pore diameter of the nano molecular sieve is 20 nm.

5. The preparation method according to claim 1, wherein the milk recovery process comprises the steps of:

weighing raw milk → testing raw milk → collecting milk → measuring → filtering → cooling;

wherein the normalization process comprises the steps of:

preheating → separation → partial homogenization → concentration → pasteurization → cooling.

6. Preparation process according to claim 1, wherein the UHT sterilization treatment comprises the following steps:

preheating → degassing → homogenizing → pre-incubation → UHT sterilization → cooling.

7. The method of claim 1, further comprising the steps of, after aseptic filling:

straw application → boxing → code spraying → lifting → stacking → temporary storage for seven days → delivery.

8. The method of claim 1, further comprising a step of ingredient processing after the normalization processing and before the UHT sterilization processing.

9. A hydrogen-rich milk, wherein the hydrogen-rich milk is prepared by the preparation method of the nano hydrogen-rich milk as claimed in any one of claims 1 to 8.

10. The hydrogen-enriched milk of claim 9, wherein the hydrogen-enriched milk has a dissolved hydrogen concentration of at least 10mg/L and a residence time in the milk of at least 5 hours for a concentration of 80% of the hydrogen gas in the unsealed state.

Technical Field

The invention relates to a preparation method of milk, in particular to a preparation method of hydrogen-rich milk, and belongs to the technical field of dairy product preparation.

Background

With the development of science and technology and the improvement of living standard of people, various beverages appear in the life of people, the beverage with single function can not meet the requirements of people, and people pay more and more attention to drinking healthy and environment-friendly beverages with health care function. Scientific research proves that hydrogen is the smallest atom in the world, has strong penetrating power, is a nontoxic and harmless substance, and can easily penetrate human cells to enter tissues and organs after entering a human body. Medical research shows that the respiratory oxygen of human body and various ingested nutrient substances generate oxidation reaction to generate required energy and simultaneously generate excessive and harmful active oxygen free radicals which are root causes of human body diseases. The hydrogen gas forms active hydrogen after entering the human body, and the active hydrogen gas and the active oxygen free radicals are subjected to neutralization reaction to form water to be discharged out of the human body, so that the number of the active oxygen free radicals for inducing diseases of the human body is reduced, and the medical care effect is achieved. A large number of clinical medical researches prove that the hydrogen has obvious treatment effect on a plurality of diseases. How to increase the content of hydrogen in human body through the daily drink of people and produce a beverage containing hydrogen is a problem to be solved urgently in society at present.

In the prior art, the hydrogen content of the beverage containing hydrogen is usually low, and the hydrogen is not lost in the process of being blended into the beverage, so that the phenomena of long production time, low efficiency, poor gas filling effect and the like can be caused.

Chinese patent application 201110247829.8, "a hydrogen-rich water and its preparation method" discloses a method for making hydrogen-rich water, mainly using nitrogen gas to make degassing treatment in a closed container, then adding hydrogen gas, the hydrogen content of the product obtained by said method is not high, and is only 1.35-1.65ppm (mg/L).

There is no substantial breakthrough in how to fully mix hydrogen with beverages and liquids and increase the hydrogen content in the beverage to prepare a stable hydrogen content beverage that can help people to remove free radicals.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a preparation method of hydrogen-rich milk with high hydrogen-rich concentration and long hydrogen retention time.

In order to realize the technical purpose, the invention provides a preparation method of nano hydrogen-rich milk, which comprises the following steps:

carrying out milk collection treatment, standardization treatment and UHT sterilization treatment on raw milk in sequence to obtain a raw milk material;

and (3) dissolving the raw milk material in hydrogen, and canning in an aseptic manner to obtain the milk rich in hydrogen.

In one embodiment of the invention, the hydrogen-dissolving treatment is carried out in a sterile tank. Wherein, the hydrogen dissolving treatment comprises the following steps:

flushing hydrogen with a flow rate of 2800L/min-3200L/min (preferably 3000L/min) into the sterile tank through a nano molecular sieve under the stirring state of 25r/min-35r/min (preferably 30r/min), so that a hydrogen flow channel entering the sterile tank is in a nano level;

stopping filling hydrogen when the hydrogen pressure in the aseptic tank reaches 3MPa, and keeping the pressure for 5-15 min to finish the hydrogen dissolving treatment.

In one embodiment of the invention, the average pore diameter of the adopted nano molecular sieve is 18nm-25 nm; the average pore diameter of the nano molecular sieve used is preferably 20 nm.

According to the preparation method of the hydrogen-rich milk, the hydrogen is dissolved in a specific step (a storage stage of an aseptic tank), so that secondary volatilization of hydrogen can be avoided; by adopting the nano molecular sieve and the pressurizing dissolving technology, the retention time of the hydrogen in the milk can be longer; stirring is carried out at a specific stirring speed, and the rotating milk and hydrogen flow form a reverse shearing action, so that the milk is wrapped with nano hydrogen bubbles, the hydrogen-rich concentration is higher, and the retention time of hydrogen in the milk is longer.

In one embodiment of the invention, the milk receiving process comprises the following steps:

weighing raw milk → testing raw milk → collecting milk → measuring → filtering → cooling.

In one embodiment of the present invention, the normalization process comprises the steps of:

preheating → separation → partial homogenization → concentration → pasteurization → cooling.

In one embodiment of the invention, the UHT sterilization process comprises the steps of:

preheating → degassing → homogenizing → pre-incubation → UHT sterilization → cooling.

In a specific embodiment of the present invention, the aseptic filling method further comprises the following steps:

straw application → boxing → code spraying → lifting → stacking → temporary storage for seven days → delivery.

In one embodiment of the present invention, a step of ingredient treatment is further included after the normalization treatment and before the UHT sterilization treatment.

The invention also provides hydrogen-rich milk, wherein the hydrogen-rich milk is prepared by the preparation method of the nano hydrogen-rich milk. The hydrogen-enriched milk has a dissolved hydrogen concentration of at least 10mg/L, and a residence time of 80% of the hydrogen concentration in the milk in an unsealed state of at least 5 hours.

The preparation method of the hydrogen-rich milk fully realizes the dissolution of hydrogen nano bubbles in the milk by the nano molecular sieve and the pressurizing dissolution technology; wherein, the concentration of dissolved hydrogen in the milk can reach 10 mg/L; the nano hydrogen bubbles do Brownian motion in the milk, so the nano hydrogen bubbles stay in the milk for a longer time than the hydrogen dissolved by non-nano technology (the stay time of 80 percent of hydrogen concentration in the milk in a non-sealing state is at least 5 hours); after being drunk by a human body, the nanoscale hydrogen molecules in the milk can reach deeper layers of intestinal tracts through digestive tracts, so that the milk is more beneficial to absorption by the human body, and particularly has better nourishing effect on intestinal probiotics.

Detailed Description

Example 1

The embodiment provides a preparation method of hydrogen-rich milk, which specifically comprises the following steps.

The method comprises the following steps of (milk receiving treatment) (weighing of raw milk → inspection of raw milk → milk receiving → metering → filtration → cooling) → storage → standardized treatment (preheating → separation → partial homogenization → concentration → pasteurization → cooling) → storage → ingredient treatment (high calcium milk, high calcium and low fat milk products) → storage of a storage tank before UHT → UHT sterilization treatment (preheating → degassing → homogenization → pre-insulation → UHT sterilization → cooling) → treatment of hydrogen dissolved in an aseptic tank → aseptic filling (insulation experiment) → straw application → boxing → code spraying → lifting → stacking → temporary storage seven days → delivery.

The hydrogen dissolving treatment of the sterile tank comprises the following steps:

under the stirring state of 30r/min, hydrogen with the flow rate of 3000L/min is flushed into the sterile tank through a nano molecular sieve (the average pore diameter is 20nm), so that a hydrogen flow channel entering the sterile tank is in a nano level;

and stopping filling hydrogen when the pressure of the hydrogen in the aseptic tank reaches 3MPa, and keeping the pressure for 10min to finish the hydrogen dissolving treatment.

Wherein, receive milk and handle including:

(1) raw milk inspection: the method mainly aims at several indexes such as sense, acidity, fat, whole milk solid, adulteration (water, alkali, starch, salt and nitrite), alcohol experiments, boiling experiments, protein and the like.

(2) Milk recovery: the milk collection temperature is specified in the enterprise standard of fresh cow milk, and the time record of the secondary batch of milk is checked. After the collection, comprehensive samples are required to be detected. Note that: the new milk and the old milk can not be stored in a mixing way; the raw milk for producing pure milk and the raw milk for producing lactic acid milk cannot be stored in a mixing way.

(3) Metering: the metering device is used for an online volume flow meter. The flow rate of the milk when being collected can be directly read by utilizing the online volume flowmeter.

(4) And (3) filtering: the raw milk is passed through a duplex filter to remove some of the larger impurities. When the pressure difference between the front and the back reaches 1bar, cleaning is switched; after the milk is collected, the filter is taken down, checked and cleaned.

(5) And (3) cooling: the collected fresh cow milk is cooled to below 4 ℃ by ice water after the plate replacement.

(6) And (3) storage: the milk is temporarily stored in a raw milk tank, and is required to be used for production as early as possible within 24 hours, and sensory indexes, acidity and alcohol experimental detection are required if the time exceeds 24 hours.

Wherein the normalization process comprises:

(1) preheating: the preheating temperature is about 50 ℃ to 55 ℃.

(2) And (3) standardization: separating milk and fat from raw milk with separator, mixing part of skimmed milk with part (or all) of cream, homogenizing at 200bar, and mixing with the rest skimmed milk. (note: finally, the fat content of the concentrated milk meets the regulation in the quality standard of pure milk semi-finished products).

(3) Concentration: if the whole milk solids are below the standard, it is concentrated. The concentrated pure milk whole milk solid is in accordance with the regulation in the quality standard of pure milk semi-finished products.

(4) Pasteurization: the sterilization condition is required to be 80-90 ℃ for 15 seconds.

(5) And (3) cooling: the milk was cooled to 1-8 ℃ by plate change with ice water.

(6) And (3) storage: the milk is temporarily stored in a milk bin, and is used for production as early as possible within 12 hours, and sensory indexes, acidity and alcohol experimental detection are carried out every 2 hours if the time exceeds 12 hours.

Wherein, the ingredient treatment (high-calcium milk, high-calcium low-fat milk product) comprises the following steps:

(1) according to the proportion of ingredients, a part of standardized milk is directly pumped into a pure milk UHT front storage tank.

(2) Heating the other part of standardized milk to 65-75 deg.C, and adding into a mixing tank.

(3) And (3) feeding the small materials into a mixing cylinder through a screw conveyor, and uniformly stirring at a high speed.

(3) And (4) beating the mixed material liquid in the mixing bowl out and passing through a heat preservation pipe for 15 min.

(4) And (3) filtering: filtering impurities by a duplex filter.

(5) Homogenizing: homogenizing the mixed solution at 200 bar.

(6) And (3) cooling: cooling the mixed liquid to below 4 deg.C by cold plate, adding into UHT milk storage tank, and mixing with standard milk.

(7) Sampling and inspecting: and (5) after the feeding is finished, stirring for 5 minutes, and sampling to test according to the quality standard of the pure milk semi-finished product.

(8) And (3) storage: the storage temperature is less than or equal to 6 ℃ and is not more than 12 hours. During storage, the stirring should be started at a low speed all the time to ensure the uniformity of the material. .

Wherein the UHT sterilization treatment comprises:

(1) preheating: at the moment, the ultrahigh temperature sterilization process is carried out, and the preheating temperature is 65-75 ℃.

(2) Vacuum degassing: the method is carried out in a degassing tank to remove air, feed impurities, beany flavor and the like.

(3) Homogenizing: homogenizing at 70-75 deg.C under 250bar (adjusting the pressure of the second pressure handle to 50bar, and then adjusting the pressure of the first pressure handle to 250 bar). The homogenizing pressure is automatically adjusted.

(4) Pre-heat preservation: 90-95 deg.C for 60 seconds is required to increase protein stability and kill enzymes.

(5) UHT sterilization: the temperature of 137-142 ℃ is required, 4 seconds are required, and the specific parameters are as follows:

a. the temperature before degassing is 70-85 DEG C

b. Degassing tank pressure: -0.3bar to-0.6 bar

c. UHT Sterilization temperature: keeping the temperature at 137-142 ℃ for 4 s.

d. Temperature to aseptic tank TC 26: less than or equal to 28 ℃ (when in production), 137 ℃ -142 ℃ (when in heating sterilization)

(6) And (3) cooling: cooling the milk to 20-25 ℃ by using circulating cooling water.

Wherein, aseptic tank storage: pumping UHT sterilized milk into a sterile tank as a buffer memory, wherein the buffer memory temperature is less than or equal to 28 ℃. The specific parameters are shown in the aseptic tank operation instruction provided by a workshop.

Wherein, the filling: the specific steps are shown in an operation instruction book provided by a workshop.

The specific parameters are as follows:

(1) before production at the pre-sterilization temperature: 270 deg.C

(2) Temperature of the air superheater: 360 deg.C

(3) Air knife temperature: 125 +/-5 DEG C

(4) Temperature of hydrogen peroxide: 70-78 deg.C

(5) Steam temperature: 130 +/-10 DEG C

(6) Sterile air pressure: 25.0KPa-35.0KPa

(7) Hydrogen peroxide concentration: 30 to 50 percent

Wherein, the finished product packaging section: sticking a pipe, boxing and spraying a code.

Wherein, the heat preservation experiment: in order to test the product quality, sampling according to the specification in the production, storing the sampled product in a heat preservation chamber (30-35 ℃) for seven days, and carrying out pH value and sensory test.

Wherein, leaving factory: after the heat preservation experiment is detected to be qualified, the product can be put on the market.

Note: 1bar is approximately equal to 0.1MPa, and 1MPa is 1000 KPa.

Example 2

This example provides a method for preparing hydrogen-rich milk, and the specific steps are substantially the same as those in example 1. The difference lies in that: the pressure was maintained for 13 min.

Example 3

This example provides a method for preparing hydrogen-rich milk, and the specific steps are substantially the same as those in example 1. The difference lies in that: the stirring speed was 25 r/min.

Example 4

This example provides a method for preparing hydrogen-rich milk, and the specific steps are substantially the same as those in example 1. The difference lies in that: the flow rate was 2800L/min.

Comparative example 1

The comparative example provides a method for preparing hydrogen-rich milk, and the specific steps are basically the same as example 1. The difference lies in that: the hydrogen pressure was 5 MPa.

Comparative example 2

The comparative example provides a method for preparing hydrogen-rich milk, and the specific steps are basically the same as example 1. The difference lies in that: the pressure was maintained for 2 min.

Comparative example 3

The comparative example provides a preparation method of hydrogen-rich milk, which comprises the following specific steps:

(1) the raw material tank is filled with produced standby milk, and the milk is pumped into a cooling tank by a pump for cooling to 15-20 ℃;

(2) pumping the cooled milk into a degassing tank, and degassing by using a vacuum pump to reach-0.085 MPa;

(3) filling hydrogen into a degassing tank by using hydrogen production equipment to balance the air pressure, and keeping the air pressure for 30min after the air pressure is balanced;

(4) the vacuum pump carries out vacuum treatment on the high-pressure air-entrapping tank to reach 0.095 MPa;

(5) pumping milk in the degassed material tank into a high-pressure gas filling tank by using a pump, opening a hydrogen filling circulating pump, and starting a hydrogen production device to fill gas into the high-pressure tank to form high pressure, wherein the high pressure reaches 0.4 MPa; the flow rate of the air-entrapping pump is 1000kg/h, and the volume ratio of hydrogen to milk is 1: 9; filling hydrogen gas under 2MPa, and circularly pressurizing by combining an explosion head;

(6) after the last step is kept for 10min, the air escape valve is opened, and the balance is carried out to the normal pressure;

(7) pumping the milk obtained in the last step into a sterilization device by a pump, sterilizing and packaging for later use.

The milk of the above-mentioned examples 1 to 4 and comparative examples 1 to 3 was subjected to the test for the time required for the dissolved hydrogen concentration and the hydrogen concentration to be maintained at 80% in the non-sealed state, and the results are shown in Table 1.

TABLE 1

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.