CN110881519A - Method for stabilizing rice bran quality - Google Patents
Method for stabilizing rice bran quality Download PDFInfo
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- CN110881519A CN110881519A CN201811112511.7A CN201811112511A CN110881519A CN 110881519 A CN110881519 A CN 110881519A CN 201811112511 A CN201811112511 A CN 201811112511A CN 110881519 A CN110881519 A CN 110881519A
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- 240000007594 Oryza sativa Species 0.000 title 1
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- 239000000463 material Substances 0.000 claims abstract description 83
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B9/00—Preservation of edible seeds, e.g. cereals
- A23B9/06—Preserving by irradiation or electric treatment without heating effect
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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- Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Cereal-Derived Products (AREA)
Abstract
A method for stabilizing rice bran quality uses a pulsed magnetic field sterilization device, takes rice bran as a sample, and the enzyme deactivation and sterilization method comprises the steps of putting rice bran materials into a glass tube from a feeding pipeline; setting the charging voltage of the capacitor to 400-450V and setting the charging and discharging period T of the delay connection functional module1、T2、T3、T4The total time is 9.5-10.6s, the action times of the pulse magnetic field is set to be 25-30 times, the pulse magnetic field generated by the coil carries out enzyme deactivation and sterilization treatment on the rice bran materials in the glass tube, any rice bran materials are conveyed to the storage bin from the glass tube through the transmission spiral stirring shaft, and the processes of continuous enzyme deactivation, sterilization treatment and output of the rice bran materials are completed. The invention can continuously complete the enzyme deactivation and sterilization process of the rice bran material, greatly reduce the activity of lipase, reduce the fatty acid value by more than 5.0mg/100g, and improve the quality stability of the rice bran.
Description
Technical Field
The invention belongs to the technical field of grain processing, and particularly relates to a method for stabilizing rice bran quality.
Background
The rice is a main grain crop in China, although the weight of rice bran which is a processing byproduct of the rice is only 5-5.5% of the weight of the rice, the rice bran is rich in 64% of nutritional functional components of the rice, wherein the fat accounts for 15-22%, the protein accounts for 12-16%, the crude fiber accounts for 7-9%, the soluble nitrogen extract accounts for 38-43%, the ash accounts for 8-12%, and the water accounts for 9-14%. The rice bran oil obtained by processing and refining rice bran contains about 38 percent of linoleic acid and about 40 percent of oleic acid, the ratio of the linoleic acid to the oleic acid is 1: 1.1, and the oil with the ratio has higher nutritional value from the viewpoint of modern nutrition. The total content of unsaponifiable lipid in the rice bran oil reaches 4.2 percent, particularly the content of gamma-oryzanol is the top of various edible oils, and the rice bran oil can effectively reduce the serum cholesterol of a human body and prevent and treat cardiovascular and cerebrovascular diseases. Therefore, the rice bran oil is functional high-quality edible vegetable oil, and the nutritional value of the rice bran oil is far higher than that of other vegetable oil such as peanut oil, soybean oil, rapeseed oil and the like.
However, lipase in rice bran cells can affect the quality of rice bran oil, so that the extraction rate of the rice bran oil is too low or the extraction value is lost, which is a technical dilemma faced by the rice bran processing industry at present. Throughout the research on the storage stabilization technology of rice bran at home and abroad, a considerable part of the research focuses on the control of the storage conditions of rice bran, including moisture, temperature, vacuum, modified atmosphere, fumigation and the like. Although some effect is obtained, among them, the cryopreservation technique of japan is well established, and cryopreservation is considered as the best method for storing rice bran. However, the whole storage and transportation system is high in investment and maintenance cost, is not suitable for popularization and promotion, and cannot fundamentally inhibit the quality deterioration of the rice bran, which is attributed to the lipase activity in the rice bran.
Therefore, a processing method for rapidly and economically stabilizing the enzyme activity of the rice bran lipase and improving the edible quality is very important. In recent years, many researchers at home and abroad are dedicated to the research on the enzyme deactivation stabilization technology of rice bran, and the methods of heat treatment, organic solvent treatment, ethanol stabilization, irradiation stabilization, superheated steam stabilization and the like are available in sequence, but the research on the rice bran stabilization technology is not long before due to the residue of chemical reagents, the safety of irradiation, the loss of heat treatment nutrient components and the like.
The magnetic field sterilization is a physical cold sterilization technology, uses a magnetic field to sterilize food, has the characteristics of no heating of sterilization materials, short time, no magnetic leakage problem, low power consumption, high sterilization efficiency, good sterilization effect, easy control, strong penetrating power, thorough sterilization and the like, can well keep the nutritional ingredients and the taste of the food while sterilizing the food, has no harmful substance residue and the like, and therefore, the pulsed magnetic field sterilization has wide market potential in the cold sterilization process. A large number of researches show that the high-strength pulsed magnetic field sterilization has important application value in the industries of food, water treatment and the like. At present, the research on the pulse magnetic field sterilization device in China is still in a laboratory stage, and the adopted discharge voltage is too high, generally from thousands of volts to tens of thousands of volts. Such high voltage brings great inconvenience to operators, and the safety performance is also poor, which hinders the research and development of the pulse magnetic field in the sterilization field and further limits the application and popularization of the pulse magnetic field in industrial production. The low-voltage pulse magnetic field sterilization technology is still a technical problem.
How to research a pulse magnetic field sterilization device with low voltage and good safety performance and apply the pulse magnetic field sterilization device to the enzyme deactivation and sterilization treatment of rice bran, and a technical method for improving the stability effect of the rice bran still is a technical problem.
Disclosure of Invention
The invention relates to a magnetic field sterilization device, which consists of a pulse electric field generating system, a pulse magnetic field acting system and a controller, and is characterized in that: the pulse electric field generating system consists of an input wire, a voltage regulator, a booster, a rectifier, a current limiter, a charging switch, a charging circuit, a charging loop and a capacitor; the input wire is connected with the voltage regulator, the voltage regulator is connected with the booster through a circuit, the booster is connected with the rectifier and the current limiter through a circuit, the rectifier is connected with the capacitor through a charging circuit and a charging loop, and the charging circuit is provided with a charging switch;
according to the pulse electric field generation system, an input wire is 220V alternating current, the voltage is stabilized by the voltage regulator and then is boosted by the booster and limited by the current limiter, alternating current with voltage and current meeting requirements is obtained, the alternating current is rectified into a direct current power supply by the rectifier, when the charging switch is closed, the direct current power supply charges the capacitor, and when the charging switch is disconnected, the charging is finished.
Preferably, the current limiter is an alternating current capacitor of 360 muF;
preferably, the rectifier is a high-voltage rectifier silicon stack;
preferably, the capacitors are 4 electrolytic capacitors of 10000 muF, a low-voltage charging technology is adopted, and the charging voltage is continuously adjustable within the range of 400-450V;
as shown in fig. 2, the pulsed magnetic field action system is composed of a discharge switch, a discharge circuit, a discharge loop, a cooling water interlayer tank, a glass tube, a coil, a spiral stirring shaft, a motor, a storage bin, a baffle rod and a base; the coil is connected with the capacitor through a discharge circuit and a discharge loop, and a discharge switch is arranged on the discharge circuit; the cooling water interlayer tank is of a cylindrical interlayer structure, the coil is arranged in an interlayer sleeve of the cooling water interlayer tank, a glass tube is arranged in an inner cavity of the cooling water interlayer tank, a baffle rod is fixedly sleeved in the inner cavity of the glass tube, the space between the inner cavity of the glass tube and the baffle rod is used as an enzyme-inactivating and sterilizing working space of rice bran materials, a spiral stirring shaft is arranged at the lower end of the inner cavity of the glass tube, and the spiral stirring shaft is connected with a motor; the cooling water interlayer tank, the glass tube and the motor are fixed on the base; a feeding pipeline is arranged on the glass tube, a discharging pipeline is arranged at the lower end of the glass tube, the discharging pipeline is a rice bran material outlet, and a storage bin is arranged below the discharging pipeline; the upper end and the lower end of the interlayer sleeve of the cooling water interlayer tank are respectively provided with a cooling water outlet and a cooling water inlet, and the cooling water outlet and the cooling water inlet are symmetrically arranged at the left end and the right end or the front end and the rear end of the interlayer sleeve of the cooling water interlayer tank;
the preferable number of the coil layers is 4, and the number of turns of the coil is 80;
the waist part of the baffle rod is of a cylindrical structure, the top part of the baffle rod is of a cone, and the difference between the diameter of the inner cavity of the glass tube and the outer diameter of the baffle rod is controlled to be 1.0-1.5 cm;
the specific working process of the pulsed magnetic field action system is as follows: rice bran materials are put into a glass tube at uniform speed through a feeding pipeline, a discharge switch is switched on, a discharge loop is switched on, a capacitor starts to discharge a coil, a pulse magnetic field generated by the coil carries out enzyme deactivation and sterilization treatment on the rice bran materials, circulating cooling water enters an interlayer sleeve of a cooling water interlayer tank through a cooling water inlet, the circulating cooling water cools the coil in the interlayer sleeve of the cooling water interlayer tank, the circulating cooling water is discharged through a cooling water outlet, and the discharged circulating cooling water is recycled after being cooled; starting a motor, wherein the motor drives a spiral stirring shaft to rotate, so that rice bran materials are conveyed into a storage bin from a glass tube through a discharge pipeline to finish the output process of the rice bran materials;
the speed of the spiral stirring shaft for conveying the rice bran materials in a rotating mode is matched with the enzyme-deactivating and sterilizing treatment time of the rice bran materials in the glass tube and is matched with the speed of the rice bran materials input by the feeding pipeline;
the controller consists of a time delay switch-on functional module, an input end I, an input end II, an output end I and an output end II, wherein the time delay switch-on functional module is used for adjusting the charging and discharging period; the two ends of the delay switch-on function module are connected with an input end I, an input end II, an output end I and an output end II, the input end I is connected with the charging circuit, the input end II is connected with the discharging circuit, the output end I is connected with the charging switch, and the output end II is connected with the discharging switch;
the time delay connection functional module is used for adjusting the charging and discharging period, and the specific working process is as follows: the delay switch-on function module is provided with 4 timing cycles: t is1、T2、T3、T4The charging and discharging period is T1、T2、T3、T4Total time of (1), T1、T2、T3、T4Adjusting within the range of 0.1-10 s; when the input end I and the input end II are connected, the timing work of the delay connection functional module starts to operate, and the rectifier passes through T1Time working, when the input end I is changed into high level, the time delay switch-on functional module switches on the charging switch to start charging, and the charging time is T2After charging is finished, the time delay switch-on functional module switches off a charging switch, and the charging switch is switched off from on; then, the time-delay connection functional module passes through T3The time interval is over, the time delay switch-on functional module switches on the discharge switch to start discharging, the discharge time is T4When the discharging is finished, the time delay connection functional module cuts off the discharging switch, the discharging switch is switched from connection to disconnection, so that a charging and discharging period is finished, and the charging and discharging working process can be completed by circulating and reciprocating; t is2And T4There is a T between3And at a time interval, simultaneous charging and discharging is avoided, and the line safety is protected.
The invention also provides a method for stabilizing the quality of rice bran, which uses a pulsed magnetic field sterilization device and takes the rice bran as a sample, and the enzyme deactivation and sterilization method comprises the following steps:
(1) preparing: putting the rice bran material 13 into a glass tube from a feeding pipeline; cooling water is boiled and enters the interlayer sleeve of the cooling water interlayer tank from the cooling water outlet;
(2) adjusting and setting parameters of the pulse magnetic field sterilization device: setting the charging voltage of the capacitor to 400-450V and setting the charging and discharging period T of the delay connection functional module1、T2、T3、T4The total time is 9.5-10.6s, specifically T1Is 0.1-0.5s, T2Is 4-5s, T3Is 0.5-1s, T4Setting the action times of the pulse magnetic field to be 25-30 times within 4-5s, wherein the effective retention sterilization time of the rice bran material in the glass tube is 237.5s-318 s; the rotating speed of the motor is adjusted according to the effective staying sterilization time of the rice bran materials in the glass tube, so that the speed of the spiral stirring shaft and the discharging speed of the rice bran materials from the glass tube are controlled, namely the speed of the spiral stirring shaft for conveying the rice bran materials in a rotating mode is matched with the enzyme-deactivating sterilization treatment time of the rice bran materials in the glass tube, and the feeding speed of the feeding pipeline is matched with the discharging speed;
(3) enzyme deactivation and sterilization: turning on a power switch of the pulse magnetic field sterilization device to switch on a power supply, and performing pulse magnetic field sterilization treatment on the rice bran materials in the glass tube; then starting a motor, driving the spiral stirring shaft to rotate by the motor, conveying the rice bran materials from the glass tube to a storage bin through a discharge pipeline, and continuously finishing the processes of enzyme deactivation and sterilization of the rice bran materials;
(4) and (3) detection: and detecting the enzyme activity and the fatty acid value of the sterilized material.
The invention has the following positive effects:
1. the pulse magnetic field sterilization device has the advantages of low voltage, good safety performance, capability of continuously completing the enzyme-inactivating sterilization process of the rice bran material and simple operation;
2. the pulse magnetic field sterilization device is used for carrying out enzyme deactivation and sterilization treatment on the rice bran, the enzyme deactivation and sterilization effects are good, the stability effect of the rice bran is improved, and the pulse magnetic field sterilization device has the advantages of being rapid and uniform in treatment, small in influence on nutritional ingredients and the like.
Drawings
FIG. 1 is a schematic circuit diagram of a pulsed electric field generating system according to the present invention;
FIG. 2 is a schematic diagram of a pulsed magnetic field application system of the present invention;
FIG. 3 is a schematic diagram of the controller of the present invention;
the attached figure illustrates that 1-input electric wire, 2-voltage regulator, 3-booster, 4-rectifier, 5-current limiter, 6-charging switch, 7-capacitor, 8-discharging switch, 9-cooling water interlayer tank, 10-feeding pipeline, 11-glass tube, 12-coil, 13-rice bran material, 14-cooling water inlet, 15-cooling water outlet, 16-spiral stirring shaft, 17-motor, 18-discharging pipeline, 19-material storage bin, 20-base, 21-time delay connection functional module, 22-charging circuit, 23-charging circuit, 24-discharging circuit, 25-discharging circuit, 26-input end I, 27-input end II, 28-output end I, 29-output end II, 30-a bar;
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Example 1
Pulsed magnetic field sterilizing equipment comprises pulsed electric field generating system, pulsed magnetic field effect system and controller, its characterized in that: the pulse electric field generating system consists of an input wire 1, a voltage regulator 2, a booster 3, a rectifier 4, a current limiter 5, a charging switch 6, a charging circuit 22, a charging loop 23 and a capacitor 7; as shown in fig. 1, an input electric wire 1 is connected to a regulator 2, the regulator 2 is connected to a booster 3 through a circuit, the booster 3 is connected to a rectifier 4 and a current limiter 5 through a circuit, the rectifier 4 and a capacitor 7 are connected to each other through a charging circuit 22 and a charging circuit 23, and a charging switch 6 is mounted on the charging circuit 22;
the pulse electric field generating system comprises the working process that: the input wire 1 is 220V alternating current, after the voltage is stabilized by the voltage regulator 2, the voltage is boosted by the booster 3 and the current is limited by the current limiter 5, alternating current with the voltage and the current meeting the requirements is obtained, the alternating current is rectified into a direct current power supply by the rectifier 4, when the charging switch 6 is closed, the direct current power supply charges the capacitor 7, and when the charging switch 6 is disconnected, the charging is finished.
Preferably, the current limiter 5 is an alternating current capacitor of 360 μ F;
preferably, the rectifier 4 is a high-voltage rectifier silicon stack;
preferably, the capacitor 7 is 4 electrolytic capacitors of 10000 muF, a low-voltage charging technology is adopted, the charging voltage is continuously adjustable within the range of 400-450V, and the energy of a single pulse is 3.80-4.00 kJ;
as shown in fig. 2, the pulsed magnetic field action system is composed of a discharge switch 8, a discharge circuit 24, a discharge loop 25, a cooling water interlayer tank 9, a glass tube 11, a coil 12, a spiral stirring shaft 16, a motor 17, a storage bin 19, a stopper rod 30 and a base 20; the coil 12 is connected with the capacitor 7 through a discharge circuit 24 and a discharge circuit 25, and a discharge switch 8 is arranged on the discharge circuit 24; the cooling water interlayer tank 9 is of a cylindrical interlayer structure, the coil 12 is arranged in an interlayer sleeve of the cooling water interlayer tank 9, the glass tube 11 is arranged in an inner cavity of the cooling water interlayer tank 9, the baffle rod 30 is fixedly sleeved in the inner cavity of the glass tube 11, and a space between the inner cavity of the glass tube 11 and the baffle rod 30 is used as an enzyme-inactivating and sterilizing working space of the rice bran material 13; the lower end of the inner cavity of the glass tube 11 is sleeved with a spiral stirring shaft 16, and the spiral stirring shaft 16 is connected with a motor 17; the cooling water interlayer tank 9, the glass tube 11 and the motor 17 are fixed on the base 20; a feeding pipeline 10 is arranged on the glass tube 11, a discharging pipeline 18 is arranged at the lower end of the glass tube 11, the discharging pipeline 18 is an outlet of the rice bran material 13, and a storage bin 19 is arranged below the discharging pipeline 18; a cooling water outlet 15 and a cooling water inlet 14 are respectively arranged at the upper end and the lower end of the interlayer sleeve of the cooling water interlayer tank 9, and the cooling water outlet 15 and the cooling water inlet 14 are symmetrically arranged at the left end and the right end or the front end and the rear end of the interlayer sleeve of the cooling water interlayer tank 9;
the coil 12 preferably has 4 coil layers and 80 turns;
the baffle rod 30 is cylindrical in waist part and conical in top part, the difference between the diameter of the inner cavity of the glass tube 11 and the outer diameter of the baffle rod 30 is controlled to be 1.0-1.5cm, the rice bran materials 13 are put into the glass tube 11 from the feeding pipeline 10, and the thin layers of the rice bran materials 13 are uniformly filled in the space between the inner cavity of the glass tube 11 and the baffle rod 30 due to the obstruction of the baffle rod 30;
the specific working process of the pulsed magnetic field action system is as follows: rice bran materials 13 are put into the glass tube 11 at uniform speed through the feeding pipeline 10, the discharge switch 8 is switched on, the discharge loop 25 is switched on, the capacitor 7 starts to discharge the coil 12, the pulse magnetic field generated by the coil 12 carries out enzyme deactivation and sterilization treatment on the rice bran materials 13, circulating cooling water enters the interlayer sleeve of the cooling water interlayer tank 9 through the cooling water inlet 14, the coil 12 is cooled in the interlayer sleeve of the cooling water interlayer tank 9 by the circulating cooling water, the circulating cooling water is discharged through the cooling water outlet 15, and the discharged circulating cooling water is recycled after being cooled; starting the motor 17, wherein the motor 17 drives the spiral stirring shaft 16 to rotate, so that the rice bran materials 13 are conveyed from the glass tube 11 to the storage bin 19 through the discharge pipeline 18, and the output process of the rice bran materials 13 is completed;
the speed of the spiral stirring shaft 16 for conveying the rice bran materials 13 in a rotating mode is matched with the enzyme deactivation and sterilization processing time of the rice bran materials 13 in the glass tube 11 and matched with the speed of the rice bran materials 13 input by the feeding pipeline 10, so that the enzyme deactivation and sterilization processing results of the rice bran materials 13 meet the technical standard indexes;
the controller consists of a time delay connection functional module 21, an input end I26, an input end II27, an output end I28 and an output end II29, wherein the time delay connection functional module 21 is used for adjusting the charging and discharging period; as shown in fig. 3, two ends of the delay-on functional module 21 are connected to an input terminal I26, an input terminal II27, an output terminal I28, and an output terminal II29, wherein the input terminal I26 is connected to the charging circuit 22, the input terminal II27 is connected to the discharging circuit 24, the output terminal I28 is connected to the charging switch 6, and the output terminal II29 is connected to the discharging switch 8;
the delay-on function module 21 is used for adjusting the charging and discharging cycles, and the specific working process is as follows: the delay-on function 21 is provided with 4 timing cycles: t is1、T2、T3、T4The charging and discharging period is T1、T2、T3、T4Total time of (1), T1、T2、T3、T4Adjusting within the range of 0.1-10 s; when the input end I26 and the input end II27 are switched on, the timing work of the time delay switching-on functional module 21 starts to operate, and the rectifier 4 passes through T1The time operation is that when the input end I26 is changed into high level, the delay switch-on functional module 21 switches on the charging switch 6 to start charging, and the charging time is T2When the charging is finished, the delay-on functional module 21 switches off the charging switch 6, and the charging switch 6 is switched off from on; the time-delay switch-on module 21 then passes through T3The time interval is over, the delayed turn-on function module 21 turns on the discharge switch 8 to start discharging, and the discharge time is T4When the discharging is finished, the delay switch-on functional module 21 switches off the discharging switch 8, and the discharging switch 8 is switched off from on, so that a charging and discharging period is finished, and the charging and discharging working process can be completed by circulating; t is2And T4There is a T between3And at a time interval, simultaneous charging and discharging is avoided, and the line safety is protected.
Example 2
A method for stabilizing rice bran quality uses a pulsed magnetic field sterilization device, takes rice bran as a sample, and comprises the following steps:
(1) preparing: putting the rice bran material 13 into a glass tube 11 from a feeding pipeline 10; cooling water is boiled and enters the interlayer sleeve of the cooling water interlayer tank 9 from a cooling water outlet 15;
(2) adjusting and setting parameters of the pulse magnetic field sterilization device: charging voltage 400V, setting charging and discharging period T of delayed connection functional module 211、T2、T3、T4Total time 10.6 s: t is1Is 0.1s, T2Is 5s, T3Is 0.5s, T4Is 5 s: setting the action times of the pulse magnetic field to be 30 times, wherein the effective retention sterilization time of the rice bran material 13 in the glass tube 11 is 318s (the charge-discharge period is 10.6s multiplied by the action times of the pulse magnetic field for 30 times); the rotating speed of the motor 17 is adjusted according to the effective staying sterilization time of the rice bran materials 13 in the glass tube 11, so that the speed of the spiral stirring shaft 16 and the discharging speed of the rice bran materials 13 from the glass tube 11 are controlled, namely the speed of the spiral stirring shaft 16 for conveying the rice bran materials 13 in a rotating manner is matched with the enzyme deactivation sterilization treatment time of the rice bran materials 13 in the glass tube 11, and the feeding speed and the discharging speed of the feeding pipeline 10 are matched;
(3) enzyme deactivation and sterilization: turning on a power switch of the pulse magnetic field sterilization device to switch on a power supply, and performing pulse magnetic field sterilization treatment on the rice bran materials 13 in the glass tube 11; then starting the motor 17, wherein the motor 17 drives the spiral stirring shaft 16 to rotate, so that the rice bran materials 13 are conveyed into the storage bin 19 from the glass tube 11 through the discharge pipeline 18, and the sterilization process of the rice bran materials 13 is continuously completed; attention is paid to collect the rice bran material 13 which is put into the bottom of the glass tube 11 for the first time and is not sterilized, and enzyme deactivation and sterilization treatment needs to be repeatedly recycled.
(4) And (3) detection: and detecting the enzyme activity and the fatty acid value of the sterilized material.
Example 3
A method for stabilizing rice bran quality uses a pulsed magnetic field sterilization device, takes rice bran as a sample, and comprises the following steps:
(1) preparing: putting the rice bran material 13 into a glass tube 11 from a feeding pipeline 10; cooling water is boiled and enters the interlayer sleeve of the cooling water interlayer tank 9 from a cooling water outlet 15;
(2) adjusting and setting parameters of the pulse magnetic field sterilization device: charging voltage 425V, setting time delay switch-on functionModule 21 charge-discharge period T1、T2、T3、T4The total time is 10s, wherein T1Is 0.3s, T2Is 4.5s, T3Is 0.7s, T4Is 4.5 s; setting the action times of the pulse magnetic field to be 27 times, and setting the effective retention sterilization time of the rice bran material 13 in the glass tube 11 to be 270s (the charge-discharge period is 10s multiplied by the action times of the pulse magnetic field to be 27 times); the rotating speed of the motor 17 is adjusted according to the effective staying sterilization time of the rice bran materials 13 in the glass tube 11, so that the speed of the spiral stirring shaft 16 and the discharging speed of the rice bran materials 13 from the glass tube 11 are controlled, namely the speed of the spiral stirring shaft 16 for conveying the rice bran materials 13 in a rotating manner is matched with the enzyme deactivation sterilization treatment time of the rice bran materials 13 in the glass tube 11, and the feeding speed and the discharging speed of the feeding pipeline 10 are matched;
(3) enzyme deactivation and sterilization: turning on a power switch of the pulse magnetic field sterilization device to switch on a power supply, and performing pulse magnetic field sterilization treatment on the rice bran materials 13 in the glass tube 11; then starting the motor 17, wherein the motor 17 drives the spiral stirring shaft 16 to rotate, so that the rice bran materials 13 are conveyed into the storage bin 19 from the glass tube 11 through the discharge pipeline 18, and the sterilization process of the rice bran materials 13 is continuously completed; attention is paid to collect the rice bran material 13 which is put into the bottom of the glass tube 11 for the first time and is not sterilized, and enzyme deactivation and sterilization treatment needs to be repeatedly recycled.
(4) And (3) detection: and detecting the enzyme activity and the fatty acid value of the sterilized material.
Example 4
A method for stabilizing rice bran quality uses a pulsed magnetic field sterilization device, takes rice bran as a sample, and comprises the following steps:
(1) preparing: putting the rice bran material 13 into a glass tube 11 from a feeding pipeline 10; cooling water is boiled and enters the interlayer sleeve of the cooling water interlayer tank 9 from a cooling water outlet 15;
(2) adjusting and setting parameters of the pulse magnetic field sterilization device: charging voltage 450V, setting charging and discharging period T of delayed connection functional module 211、T2、T3、T4The total time is 9.5s, where T1Is 0.5s, T2Is 4s, T3Is 1s, T4Is 4 s:setting the action frequency of the pulse magnetic field to be 25 times, wherein the effective retention sterilization time of the rice bran material 13 in the glass tube 11 is 237.5s (the charge-discharge period is 9.5s multiplied by the action frequency of the pulse magnetic field is 25 times); the rotating speed of the motor 17 is adjusted according to the effective staying sterilization time of the rice bran materials 13 in the glass tube 11, so that the speed of the spiral stirring shaft 16 and the discharging speed of the rice bran materials 13 from the glass tube 11 are controlled, namely the speed of the spiral stirring shaft 16 for conveying the rice bran materials 13 in a rotating manner is matched with the enzyme deactivation sterilization treatment time of the rice bran materials 13 in the glass tube 11, and the feeding speed and the discharging speed of the feeding pipeline 10 are matched;
(3) enzyme deactivation and sterilization: turning on a power switch of the pulse magnetic field sterilization device to switch on a power supply, and performing pulse magnetic field sterilization treatment on the rice bran materials 13 in the glass tube 11; then starting the motor 17, wherein the motor 17 drives the spiral stirring shaft 16 to rotate, so that the rice bran materials 13 are conveyed into the storage bin 19 from the glass tube 11 through the discharge pipeline 18, and the sterilization process of the rice bran materials 13 is continuously completed; attention is paid to collect the rice bran material 13 which is put into the bottom of the glass tube 11 for the first time and is not sterilized, and enzyme deactivation and sterilization treatment needs to be repeatedly recycled.
(4) And (3) detection: and detecting the enzyme activity and the fatty acid value of the sterilized material.
Comparative example 1: is not treated
Weighing 100g of rice bran, and measuring the activity and the fatty acid value of the lipase.
The result of the detection
The detection results are shown in table 1: the lipase activity adopts a method for measuring the lipase activity of GB/T5523 grain and oil, and the fatty acid value adopts a method for measuring the fatty acid value of GB/T20569 rice.
TABLE 1
| Item | Lipase activity (in terms of dry basis, KOH, mg/g) | Fatty acid number (in terms of dry basis, KOH, mg/100g) |
| Example 2 | 5.9 | 32.0 |
| Example 3 | 6.8 | 30.2 |
| Example 4 | 6.0 | 31.2 |
| Comparative example 1 | 168 | 36.2 |
Compared with the untreated rice bran of the comparative example 1, the lipase activity of the examples 2, 3 and 4 is greatly reduced, the fatty acid value is reduced by more than 5.0mg/100g, and the quality stability of the rice bran is improved;
the pulse magnetic field sterilization device is applied to rice bran for enzyme deactivation and sterilization treatment, has good safety performance and simple operation, not only improves the stability effect of the rice bran, but also has the advantages of rapid and uniform treatment, small influence on nutrient components and the like.
Claims (1)
1. A method for stabilizing rice bran quality uses a pulsed magnetic field sterilization device, takes rice bran as a sample, and is characterized by comprising the following steps:
(1) preparing: putting the rice bran material (13) into a glass tube (11) from a feeding pipeline (10); cooling water is boiled and enters the interlayer sleeve of the cooling water interlayer tank (9) from a cooling water outlet (15);
(2) adjusting and setting parameters of the pulse magnetic field sterilization device: setting the charging voltage of 400-450V for the capacitor (7), and setting the time delaySwitching on the charge-discharge cycle T of the functional module (21)1、T2、T3、T4The total time is 9.5-10.6s, specifically T1Is 0.1-0.5s, T2Is 4-5s, T3Is 0.5-1s, T4Setting the action times of the pulse magnetic field to be 25-30 times within 4-5s, wherein the effective retention sterilization time of the rice bran material (13) in the glass tube (11) is 237.5s-318 s; the rotating speed of the motor is adjusted according to the effective retention sterilization time of the rice bran materials (13) in the glass tube (11), so that the speed of the spiral stirring shaft (16) and the discharging speed of the rice bran materials (13) from the glass tube (11) are controlled, namely the speed of the spiral stirring shaft (16) for rotationally conveying the rice bran materials (13) is matched with the enzyme deactivation sterilization treatment time of the rice bran materials (13) in the glass tube (11), and the feeding speed of the feeding pipeline (10) is matched with the discharging speed;
(3) enzyme deactivation and sterilization: turning on a power switch of the pulse magnetic field sterilization device to switch on a power supply, and performing pulse magnetic field sterilization treatment on the rice bran materials (13) in the glass tube (11); then starting a motor (17), wherein the motor (17) drives a spiral stirring shaft (16) to rotate, rice bran materials (13) are conveyed into a storage bin (19) from a glass tube (11) through a discharge pipeline (18), and enzyme deactivation and sterilization processes of the rice bran materials (13) are continuously completed;
(4) and (3) detection: and detecting the enzyme activity and the fatty acid value of the sterilized material.
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