阅读说明：本技术 一种麦麸的柔性脱皮方法 (Flexible wheat bran peeling method ) 是由 杨波 马跃 韩静 于 2021-07-26 设计创作，主要内容包括：本发明涉及谷物脱皮技术领域,公开了一种麦麸的柔性脱皮方法,包括一次柔性脱皮、润麦和二次柔性脱皮步骤,润麦步骤中润麦剂为碳酸氢钾溶液,碳酸氢钾的浓度为0.5％-5％,润麦剂的添加量为净青稞质量的10-20％,润麦时间为30-80min。本发明通过润麦和两次柔性脱皮的操作,能够使青稞的脱皮过程相对轻柔舒缓,避免造成脱皮过度造成胚乳损耗,在润麦的过程中,通过对润麦剂的优化,在达到有效润麦的同时,还能够实现钝化酶活性和稳定植酸的目的,尽最大可能的保留了青稞中的营养物质,且能够实现麸皮层的富集。(The invention relates to the technical field of grain peeling, and discloses a flexible wheat bran peeling method which comprises the steps of primary flexible peeling, wheat wetting and secondary flexible peeling, wherein in the wheat wetting step, a wheat wetting agent is a potassium bicarbonate solution, the concentration of potassium bicarbonate is 0.5-5%, the addition amount of the wheat wetting agent is 10-20% of the mass of clean highland barley, and the wheat wetting time is 30-80 min. The method can lead the hulling process of the highland barley to be relatively soft and smooth through the operations of wheat wetting and two times of flexible hulling, avoid endosperm loss caused by excessive hulling, achieve the aims of effectively wetting the barley and simultaneously passivating enzyme activity and stabilizing phytic acid through the optimization of the wheat wetting agent in the process of wetting the barley, reserve nutrient substances in the highland barley as much as possible, and realize the enrichment of bran layers.)

1. A wheat bran flexible peeling method is characterized in that: the method comprises the steps of primary flexible peeling, wheat wetting and secondary flexible peeling, wherein a wheat wetting agent in the wheat wetting step is a potassium bicarbonate solution.

2. A method of flexible bran peeling of claim 1, wherein: in the step of wheat wetting, the concentration of the potassium bicarbonate solution is 0.5 to 5 percent.

3. A method of flexible bran peeling as claimed in claim 2, wherein: the addition amount of the wheat wetting agent is 10-20% of the mass of the clean highland barley.

4. A method of flexible bran peeling of claim 3, wherein: in the step of wheat wetting, the wheat wetting time is 30-80 min.

5. A method of flexible bran peeling of claim 6, wherein: the temperature of the primary flexible peeling and the secondary flexible peeling is less than 40 ℃.

6. A method of flexible bran peeling of claim 5, wherein: the secondary flexible peeling is completed by flexible peeling equipment, the flexible peeling equipment comprises a shell and a peeling mechanism arranged in the shell, and the peeling mechanism comprises a screen cylinder, a rotating shaft and a blade assembly; a screen cloth section of thick bamboo is fixed in the casing, and the pivot is rotated and is connected in the casing and be located the inside of a screen cloth section of thick bamboo, and blade subassembly sets up on the outer wall of pivot, is provided with the adjusting part who is used for adjusting the distance between blade subassembly and the screen cloth section of thick bamboo inner wall between blade subassembly and the pivot.

7. A method of flexible bran peeling of claim 6, wherein: the blade subassembly includes a plurality of groups blade, and the blade all includes connecting portion and peeling portion, is provided with on the peeling portion and scrapes the layer.

8. A method of flexible bran peeling as claimed in claim 7, wherein: the adjusting component comprises a connecting seat and a fastening bolt, the connecting seat is fixed on the outer wall of the rotating shaft, a connecting groove used for inserting the blade connecting portion is formed in the middle of the connecting seat, and a strip-shaped connecting hole is formed in the connecting portion.

9. A method of flexible bran peeling as claimed in claim 8, wherein: and a sand roller is arranged between every two adjacent groups of blades to form a structure in which the blades and the sand roller are alternately arranged.

10. A method for the flexible desquamation of wheat bran according to claim 9, wherein: the shell and the peeling mechanism are provided with two feed inlets, and the outer edges of the two feed inlets are provided with feed hoppers.

Technical Field

The invention relates to the technical field of grain dehulling, in particular to a flexible dehulling method for wheat bran.

Background

The highland barley (with the scientific name of Hordeum vulgare L.var.nudum hook.f.) is a grass family, a barley genus and an annual herb plant, and is mainly distributed in areas with higher altitude, such as Ganzui, Abacan, Gansu and the like in Tibet, Qinghai and Sichuan of China. The highland barley is the crop with the highest beta-glucan in the world wheat crops, and the average content of the beta-glucan of the highland barley is detected to be 6.57 percent, and the average content of the excellent highland barley can reach 8.6 percent, which is 50 times of the average content of the wheat. The total dietary fiber content of the highland barley is 16 percent, wherein the insoluble dietary fiber accounts for 9.68 percent, and the soluble dietary fiber accounts for 6.37 percent, the former is 8 times of wheat, and the latter is 15 times of wheat. In addition, the highland barley also contains various vitamins and minerals, and has positive effect on promoting the healthy development of human bodies.

The highland barley fruit consists of embryo, endosperm and cortex, wherein the highland barley cortex contains abundant dietary fiber, and has effects of promoting intestinal peristalsis and various dietary therapy health promotion effects. However, the insoluble dietary fiber content in the highland barley cortex is high, so that the highland barley peel-containing highland barley cereal flour has rough mouthfeel when being directly eaten. Therefore, the highland barley is usually peeled when being processed at present. At present, the traditional peeling mode is usually completed by a peeling device, namely, highland barley is directly ground and peeled by using a grinding wheel of a peeling device. Although the hulling mode can well realize hulling of the highland barley, the hulling mode of grinding often has the problem of excessive hulling, so that an endosperm layer is ground, and nutrition loss of highland barley fruits is caused. In addition, the existing grinding and peeling mode enables the skin layer and the endosperm layer to be ground finely and mixed together due to excessive grinding, and the enrichment of the skin layer and the subsequent utilization of bran cannot be realized.

Disclosure of Invention

The invention aims to provide a wheat bran flexible peeling method to solve the problem of nutrition loss of highland barley fruits caused by excessive peeling due to a grinding peeling mode in highland barley peeling in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a flexible wheat bran peeling method comprises the steps of primary flexible peeling, wheat wetting and secondary flexible peeling, wherein in the wheat wetting step, a wheat wetting agent is a potassium bicarbonate solution.

The principle and the advantages of the scheme are as follows: in practical application, in the technical scheme, conventional flexible peeling equipment (blade cutting) is adopted in one-time flexible peeling, and before one-time flexible peeling, a non-wheat-wetting mode is adopted, so that the cortex can be retained to the maximum extent to scrape wastes such as wax and dust on the surface. Before secondary flexible peeling, wheat wetting treatment is carried out, and in the process, potassium ions in the potassium bicarbonate solution can complex phytic acid in the highland barley to prevent the highland barley from being degraded; on the other hand, the potassium carbonate solution can make the whole wheat wetting system be alkalescent and has the function of stabilizing phenolic substances, and in addition, the alkalescent environment can also passivate the activity of phytase, so that the aim of preventing phytic acid from being degraded is further fulfilled, and the nutrient substances in the highland barley are kept as far as possible.

The beneficial effects of this technical scheme lie in: this technical scheme passes through the operation of ordinary flexible desquamation, moist wheat, the flexible desquamation of secondary, can make the desquamation process of highland barley soft relatively and relaxed, avoids excessively causing the endosperm loss because of the desquamation, at the in-process of moist wheat, through the optimization to the wheat wetting agent, when reaching effective moist wheat, can also realize passivating enzyme activity and the purpose of stabilizing phytic acid, has remain the nutrient substance in the highland barley as far as possible. In addition, because accurate peeling can be realized, the independent enrichment of the bran layer can be realized after peeling, and the subsequent utilization of the bran is convenient.

Preferably, as a modification, the concentration of the potassium bicarbonate solution in the step of wetting the wheat is 0.5% -5%.

In the technical scheme, the optimal wheat wetting effect can be ensured by limiting the concentration of the potassium bicarbonate solution.

Preferably, as an improvement, the addition amount of the wheat wetting agent is 10-20% of the mass of the clean highland barley.

In the technical scheme, the optimal wheat wetting effect can be achieved by optimizing the addition amount of the wheat wetting agent, and insufficient wheat wetting can be caused by too little wheat wetting agent, so that the peeling effect is poor; too much water content in the raw material increases, which is not favorable for storage.

Preferably, as an improvement, in the step of wetting, the time for wetting is 30-80 min.

In the technical scheme, the concentration and the addition of the wheat wetting agent are optimized, so that the whole wheat wetting process can be completed within 30-80min, and the conventional wheat wetting is required for 3-5h, the wheat wetting time is shortened by 0.5-1.5 h, and the wheat wetting efficiency is improved.

Preferably, as an improvement, the temperature of the primary flexible peeling and the secondary flexible peeling is less than 40 ℃.

In the technical scheme, the temperature of the primary flexible peeling and the secondary flexible peeling is controlled, so that the two peeling processes can be carried out under the relatively low temperature condition, the activity of phytase can be inhibited, and the degradation of phytic acid caused by the activation of phytase is avoided.

Preferably, as an improvement, the secondary flexible peeling is completed by using a flexible peeling device, the flexible peeling device comprises a shell and a peeling mechanism arranged in the shell, and the peeling mechanism comprises a screen cylinder, a rotating shaft and a blade assembly; a screen cloth section of thick bamboo is fixed in the casing, and the pivot is rotated and is connected in the casing and be located the inside of a screen cloth section of thick bamboo, and blade subassembly sets up on the outer wall of pivot, is provided with the adjusting part who is used for adjusting the distance between blade subassembly and the screen cloth section of thick bamboo inner wall between blade subassembly and the pivot.

In the technical scheme, when the highland barley is subjected to secondary flexible peeling treatment, the highland barley to be peeled is placed in the screen cylinder, the rotating shaft is driven to rotate, the rotating shaft drives the blade assembly to rotate, and the blade assembly can circularly cut the skin of the highland barley in the rotating process so as to remove the skin of the highland barley. After the hulling, the highland barley bran can be discharged from the holes of the screen cylinder, and the highland barley fruits can be retained in the screen cylinder, so that the hulled seeds and peels of the highland barley can be automatically separated. In the technical scheme, the distance between the blade assembly and the inner wall of the screen cylinder can be adjusted by arranging the adjusting assembly, long-term practice proves that for highland barley, the optimal distance between the blade and the screen cylinder is the length of one highland barley grain, namely, the optimal peeling effect is achieved when the distance is about 1.5mm, and the peeling effect can be ensured and the endosperm layer loss caused by excessive peeling can not be caused. The peeling equipment of the technical scheme can also be used for peeling other grains, and only the distance between the targeted adjusting blade and the screen cylinder is needed, so that the application range of the device is enlarged.

Preferably, as an improvement, the blade assembly includes a plurality of sets of blades, and the blade all includes connecting portion and peeling portion, and peeling portion is last to be provided with the scraping layer.

In the technical scheme, the blade assemblies are arranged into a plurality of groups, and when the rotating shaft rotates, the highland barley epidermis is scraped by the plurality of groups of blades in a circulating manner, so that the peeling effect can be ensured; the connecting portion are used for being connected with adjusting part, and the desquamation portion is used for scraping the highland barley epidermis, through set up scraping layer in the desquamation portion, can scrape the highland barley epidermis after the blade, utilizes the scraping effect of scraping layer to realize the desquamation of highland barley, can improve the efficiency of desquamation.

Preferably, as an improvement, the adjusting part includes connecting seat and fastening bolt, and the connecting seat is fixed on the outer wall of pivot, and the middle part of connecting seat is provided with and is used for inserting the spread groove of establishing blade connecting portion, is provided with the connecting hole of bar on the connecting portion.

In this technical scheme, when the installation blade, insert the spread groove with its connecting portion for spread groove is just right with the connecting hole, and then utilize fastening bolt fixed can, convenient operation. And through setting the connecting hole to the bar for when the installation blade, through the fixed fastening bolt in the different positions in bar hole, can realize the adjustment of the overhanging distance of blade/position, thereby realize the regulation of distance between blade and the screen cloth section of thick bamboo inner wall, structural design is reasonable, and the operation degree of difficulty is low.

Preferably, as an improvement, a sand roller is arranged between two adjacent groups of blades, so that a structure that the blades and the sand roller are alternately arranged is formed.

In the technical scheme, the grinding wheel is arranged between the two adjacent groups of blades, namely every two adjacent groups of blades are replaced by the grinding roller, so that a structure that the grinding rollers and the blades are alternately arranged is formed, the friction force between the grinding wheels and highland barley can be increased, the integration of scraping, wiping and grinding is formed, the abdominal furrow skins of wheat are synchronously ground, and the hulling effect of the highland barley is ensured; and compare the form of connecting the sand roller with whole pivot among the prior art, this kind of interlude formula in this scheme adds the form of sand roller, can be when guaranteeing the desquamation effect, avoids causing the highland barley to desquamate excessively, the problem of nutrient substance loss because of frictional force is too big.

Preferably, as an improvement, casing and peeling mechanism all are provided with two, and all are provided with the feed inlet on the casing, and the outer fringe of two feed inlets is provided with the feeder hopper.

Among this technical scheme, when the in-service use, ally oneself with two equipment and use, be about to two equipment and set up with the mode side by side, when the feeding, treat that the cereal of desquamation can follow two feed inlets of feeder hopper difference fall the screen cloth section of thick bamboo in, can realize the dispersion feeding, avoid the highland barley to pile up and lead to the desquamation effect not good in the desquamation region.

Drawings

Fig. 1 is a front view of a wheat bran flexible peeling apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of a combination of two wheat bran flexible peeling apparatuses in accordance with one embodiment of the present invention.

Fig. 3 is a microscopic picture of highland barley grains before peeling.

Fig. 4 is a microscopic picture of highland barley grains after being processed by F1.

Fig. 5 is a microscopic picture of highland barley grains after being processed by F2.

Fig. 6 is a microscopic picture of highland barley grains after F4 treatment.

Fig. 7 is a microscopic picture of highland barley grains after F5 treatment.

Fig. 8 is a microscopic picture of highland barley grains after F6 treatment.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the wheat bran harvester comprises a shell 1, a movable cover 2, an observation visual cup 3, a cover plate 4, a feeding hole 5, a screen drum 6, a rotating shaft 7, a feeding pipeline 8, a finished product discharging hole 9, a discharging funnel 10, a wheat bran outlet 11, a feeding hopper 12 and a driving motor 13.

Example one

A flexible wheat bran peeling method comprises the following steps:

step I: removing impurities (including but not limited to cobblestone, grass seed and heterogeneous grain) from the highland barley by cleaning, and separating with a cylinder classifier to obtain clean highland barley;

step II: performing primary flexible peeling on the highland barley by using a common flexible peeling device (corresponding to F1 below), and controlling the temperature of the primary flexible peeling below 40 ℃;

step III: wetting the highland barley subjected to primary flexible peeling for 30min, wherein the wetting agent is a potassium bicarbonate solution with the concentration of 0.5%, the addition amount of the wetting agent is 15% of the mass of the highland barley;

step IV: secondary flexible peeling, draining the wet highland barley, and performing secondary flexible peeling with improved flexible peeling equipment (corresponding to F2-F6 below), wherein the temperature of the secondary flexible peeling is controlled below 40 deg.C (usually room temperature).

The structure of the improved flexible peeling device used in the secondary flexible peeling process is basically shown in the attached figures 1 and 2 and comprises a shell 1, a peeling mechanism and a discharging mechanism.

The top of casing 1 is connected with movable cover 2 through the hinge rotation, is fixed with vertical transparent observation visual cup 3 through the bolt on the movable cover 2, and the top of observing visual cup 3 is provided with the ash hair and inhales the export, and the ash hair is inhaled exit threaded connection and is had apron 4. The top end of the shell 1 is also provided with a feed inlet 5.

The peeling mechanism is used for peeling the highland barley, the peeling mechanism comprises a screen cylinder 6, a rotating shaft 7 and a blade component, the screen cylinder 6 is of a cylindrical structure, the screen cylinder 6 is transversely arranged and is fixed in the shell 1 through a bolt, and a feeding pipeline 8 is communicated between the feeding port 5 and the screen cylinder 6. The rotating shaft 7 is transversely connected in the shell 1 in a rotating mode, and the rotating shaft 7 is located in the screen drum 6 and is arranged coaxially with the screen drum 6. Blade subassembly sets up on the outer wall of pivot 7, and blade subassembly includes nine sets of blades, and nine sets of blades are along the outer wall circumference equipartition setting of pivot 7, and the blade in this embodiment is the broadsword, and the one end of blade is connecting portion, the other end is the peeling portion, and bonds on the peeling portion of blade and has the rubber layer, and the connecting portion of blade pass through the bolt fastening on the outer wall of pivot 7. A sand roller is arranged between the two adjacent groups of blades, and a grinding wheel is fixed on the outer wall of the rotating shaft 7 to form a state that the sand roller and the blades are alternately arranged.

Discharge mechanism includes finished product ejection of compact subassembly and undersize ejection of compact subassembly, and finished product ejection of compact subassembly includes finished product discharge gate 9, and finished product discharge gate 9 sets up on casing 1, and finished product discharge gate 9 communicates with a screen cloth section of thick bamboo 6, and just to setting up with charge-in pipeline 8. The undersize discharging component comprises a discharging funnel 10 and a wheat bran outlet 11, the discharging funnel 10 is fixed in the shell 1, and the discharging funnel 10 is located below the screen drum 6. The top end opening of discharge funnel 10 sets up, and the bottom of discharge funnel 10 is provided with wheat skin export 11.

The specific implementation process is as follows: in the embodiment, when the wheat bran huller is used, two wheat bran flexible hulling devices are combined as shown in fig. 2, and the feed inlets 5 of the two wheat bran flexible hulling devices are adjacent and attached to each other, so that feeding is facilitated; the two wheat bran outlets 11 are close to each other and attached to each other, so that the wheat bran is convenient to receive materials. In addition, the same feed hopper 12 is arranged at the outer edges of the two feed inlets 5, so that the effect of dispersed feeding is realized. The two wheat bran flexible peeling devices are driven by the same driving motor 13, namely the driving motor 13 is fixed on the shell 1 through bolts, and driving belts are respectively connected between the output shaft of the driving motor 13 and the two rotating shafts 7.

When the highland barley is peeled, the highland barley is fed along the feed hopper 12, and because the two feed inlets 5 are arranged side by side, the highland barley can realize automatic dispersed feeding in the feeding process, and the highland barley can be respectively fed into the screen cylinder 6 along the feed pipeline 8. And starting the driving motor 13, driving the two rotating shafts 7 to rotate by the driving belt of the driving motor 13, driving the blades to rotate by the rotating shafts 7 in the rotating process, and sequentially and circularly cutting the skins of the highland barleys by the multiple groups of blades. The rubber layer on the blade can scrape the scratched highland barley epidermis in the rotating process, so that the highland barley is peeled. And because the rubber layer has certain elasticity, the scraping force between the rubber layer and the highland barley epidermis is relatively relaxed, and the damage to the highland barley fruit can be avoided. The grinding wheel is additionally arranged between the two adjacent groups of blades, so that the friction force between the grinding wheel and the highland barley can be increased, and the highland barley peeling effect is guaranteed.

After peeling, the highland barley finished product can be held back in the screen cylinder 6, and the highland barley finished product can be discharged through the finished product discharge port 9. The highland barley bran is discharged from the holes of the screen cylinder 6 and falls into the discharging hopper 10, and finally the bran discharging is completed along the bran outlet 11, so that the peel and seeds after the highland barley is peeled are automatically separated.

When equipment is inside to break down, rotate open movable cover 2 overhaul can, convenient operation. The ash and hair suction outlet on the movable cover 2 is used for cleaning the residual impurities in the shell 1, and the impurities can be sucked and removed in a negative pressure adsorption mode.

Example two

The difference between the present embodiment and the first embodiment is: in this embodiment, the blade subassembly is not fixed in the pivot, is provided with the adjusting part who is used for adjusting the distance between blade subassembly and the 6 inner walls of screen cloth section of thick bamboo between blade subassembly and the pivot 7, and the adjusting part includes connecting seat and fastening bolt, and the connecting seat is L shape structure, and the one end welded fastening of connecting seat is on the outer wall of pivot 7, and the other end middle part of connecting seat is provided with the spread groove that is used for inserting the blade connecting portion of establishing, is provided with the mounting hole on the spread groove, is provided with the connecting hole of bar on the connecting portion of blade.

Through setting up adjusting part, can adjust the distance between blade subassembly and the screen cloth section of thick bamboo inner wall, long-term experiment verifies that to the highland barley, the peeling effect is the best when the distance between blade and the screen cloth section of thick bamboo is 1.5mm, can enough guarantee the peeling effect and can not cause the peeling excessively and cause the endosperm layer loss.

When the blade is installed, the connecting part of the blade is inserted into the connecting groove, then the fastening bolt sequentially penetrates through the installing hole, the connecting groove and the connecting hole, and the blade is screwed and fixed by the locking nut, so that the operation is convenient. And through setting the connecting hole to the bar for when the installation blade, through the fixed fastening bolt in the different positions in bar hole, can realize the adjustment of the overhanging distance of blade/position, and then adjust the distance between blade tip and the screen cloth section of thick bamboo 6 to the best.

Examples of the experiments

Experimental example I yield of bran

1. And (3) experimental design: the method is characterized in that the highland barley treated in the same batch with the same quality (500kg) is subjected to peeling treatment, the specific test design is as follows, wherein the detailed treatment modes of F1-F6 in the process flow are as follows:

f1: common flexible peeling is adopted, namely: the blade component is only provided with a blade and is not provided with a rubber layer and a grinding wheel;

f2: this scheme of adoption improvement type flexible desquamation equipment desquamation, promptly: peeling by adopting the cooperation of a blade, a rubber layer and a sand roller;

f3: this scheme of adoption improvement type flexible desquamation equipment desquamation, promptly: peeling by adopting the cooperation of a blade, a rubber layer and a sand roller;

f4: this scheme of adoption improvement type flexible desquamation equipment desquamation, promptly: peeling by adopting blade, rubber layer and sand roller

F5: this scheme of adoption improvement type flexible desquamation equipment desquamation, promptly: peeling by adopting the cooperation of a blade, a rubber layer and a sand roller;

f6: this scheme of adoption improvement type flexible desquamation equipment desquamation, promptly: and peeling by using the cooperation of the blade, the rubber layer and the sand roller.

2. Test results

TABLE 1

As can be seen from Table 1, the F1 common flexible peeling is adopted, the peeling yield (the percentage of peeled products in the total mass of the highland barley) is only 0.23%, and only dust impurities on the surface of the highland barley are basically removed; the method adopts F2-the improved flexible peeling equipment of the invention to peel, the peeling yield is 2.52%, adopts F3 to peel, the peeling yield is 2.66%, adopts F4 to peel, the peeling yield is 1.97%, and after highland barley is sequentially peeled by F2, F3 and F4 (the secondary flexible peeling step is repeated for three times), the total peeling yield is equivalent to the proportion of highland barley bran, thus realizing the accurate peeling of highland barley bran. Then the peeling yield sum of highland barley sequentially passing through F5, F6, F5 and F6 is close to the ratio of the highland barley aleurone layer, and the accurate separation of the aleurone layer can be realized.

Experimental example II, content of nutrient substances in peeled highland barley

In the present embodiment, the following is described in the existing literature (highland barley whole grain and its action research for preventing and treating metabolic syndrome — goer trumpetcreeper): the nutrient composition of each part of the highland barley seeds before peeling is shown in table 2.

TABLE 2

The highland barley of the same quality (500kg) and the same batch is peeled by using different peeling modes, and the test design is as follows:

the improved gentle mixing is that F2, F3 and F4 are sequentially carried out; the conventional peeling is performed by using F1; the flexible peeling and the sand roller mean that F2+ traditional sand roller peeling of the scheme is sequentially carried out; the conventional sand roll peeling for 2 times refers to a traditional sand roll peeling mode which is carried out twice in sequence.

Each set of experiments was performed 3 times and the results are shown in table 3. Among them, the measurement methods of arabinoxylan and polyphenol are shown below.

1. The method for measuring the arabinoxylan comprises the following steps: measured according to phloroglucinol spectrophotometry

0.1g of the sample powder was placed in a 15mL centrifuge tube and 4mL1 mol/L H was added₂SO₄Mixing, boiling in water bath for 10min, and cooling to room temperature. Centrifuging at 6000r/min for 5min, collecting 1mL supernatantAdd an equal volume of H to a 15mL centrifuge tube₂O, adding 10mL of reaction solution (110mL of glacial acetic acid, 2mL of concentrated HCl, 1mL of 1.75 g/mL of glucose solution and 5mL of 10% phloroglucinol-ethanol solution), mixing, placing in boiling water for reaction for 25min, rapidly cooling to room temperature, and stopping the reaction. And (3) measuring and calculating the difference of the absorbance of the reaction solution by adopting a double-wavelength method (552 and 510nm), and calculating the content of the arabinoxylan in the sample according to a xylose standard curve.

2. Method for measuring phenolic substances

Extracting phenolic substances: extracting free phenol: accurately weighing 1.0g of sample powder, and mixing the sample powder according to a material-liquid ratio of 1: adding acetone with volume fraction of 80% at a ratio of 25(g/mL), ultrasonic treating at room temperature for 30min, centrifuging (4000r/min) for 10min, and collecting supernatant. Extracting the residue with the same method for 2 times, mixing the supernatants, evaporating to dryness at 45 deg.C under reduced pressure, diluting with methanol to 10mL, filtering with 0.45 μm organic membrane to obtain free phenolic substance extract, and storing the extract at-20 deg.C in dark. Extraction of bound phenol: adding 20m L n-hexane into the residue after extraction of free phenol, shaking, centrifuging (3000r/min, 5min), and discarding the supernatant. 17mL of 11% hydrochloric acid-methanol solution was added to the precipitate, and the mixture was subjected to 75 ℃ water bath for 1 hour, extracted 3 times with 20mL of ethyl acetate, and centrifuged (3000r/min, 5 min). Mixing ethyl acetate extracts, rotary evaporating at 45 deg.C to dryness, diluting with methanol to constant volume of 10mL, filtering with 0.45 μm organic membrane to obtain sample combined phenol extract, and storing at-20 deg.C in dark.

And (3) measuring the polyphenol content: adopting Folin-phenol determination method, sucking sample extractive solution 125 μ L into test tube, adding distilled water 500 μ L and Folin-phenol reagent 125 μ L, shaking, reacting for 6min, adding 7% Na 1.25mL₂CO₃1mL of distilled water was added to the solution, and the solution was left at room temperature for 1.5 hours in the dark. The blank of the sample extracting solution is replaced by methanol for zero adjustment, the absorbance of free phenol and bound phenol in the extracting solution is measured at the wavelength of 760nm, and the experiment is repeated for 3 times. Preparing gallic acid standard substances with different concentration gradients to prepare a standard curve. The phenol content was calculated as gallic acid equivalent (mg/100g) per 100g of extract (dry basis).

As shown in table 3, after the highland barley fruits are peeled by different peeling methods, the skin layer (peeled substances) is collected and detected for nutrients, wherein after the highland barley fruits are peeled by improved soft peeling mixing, most of the peeled skin layer is crude fiber and arabinoxylan, which are indication components corresponding to bran, and phytic acid, starch and beta-glucan are significantly lower than those of other peeling methods, so that accurate peeling can be realized; the peeling mode with the sand roller is adopted, the content of protein and starch in the peeled product is high, and the loss of the peeled product to the aleurone layer and the endosperm layer is large.

TABLE 3 nutrient content table before and after hulling highland barley

Experiment example three: micrographs

The states of the highland barley seeds before peeling, the highland barley seeds after F1 treatment, the highland barley seeds after F2 treatment, the highland barley seeds after F4 treatment, the highland barley seeds after F5 treatment and the highland barley seeds after F6 treatment under an optical microscope are respectively shown in figures 3-8, and the results show that: the state of the highland barley seeds before peeling is shown in figure 3; the skin of the highland barley seed treated by F1 is basically kept intact, and only slight scratch marks on the surface are shown in figure 4; as shown in fig. 5, the surface layer of the highland barley seed treated by F2 has only slight trace; FIG. 6 shows that after treatment with F1-F4, the skin layer is substantially completely removed with only a small portion remaining; as shown in fig. 7 and 8, the highland barley kernels after being processed by F5 and F6 have the aleurone layer basically removed and the end parts have embryo structures.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.