CN111264787B - Selenium-enriched bittern-flavored salted preserved egg and preparation method thereof - Google Patents

Selenium-enriched bittern-flavored salted preserved egg and preparation method thereof Download PDF

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CN111264787B
CN111264787B CN202010209428.2A CN202010209428A CN111264787B CN 111264787 B CN111264787 B CN 111264787B CN 202010209428 A CN202010209428 A CN 202010209428A CN 111264787 B CN111264787 B CN 111264787B
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ultrasonic
egg
eggs
selenium
parts
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CN111264787A (en
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刘光宪
王丽
李雪
魏益华
付晓记
祝水兰
何家林
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Agricultural Institute Of Agriculture Jiangxi Province
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    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L15/00Egg products; Preparation or treatment thereof
    • A23L15/30Addition of substances other than those covered by A23L15/20 – A23L15/25
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L27/00Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
    • A23L27/10Natural spices, flavouring agents or condiments; Extracts thereof
    • A23L27/14Dried spices
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L33/00Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/10General methods of cooking foods, e.g. by roasting or frying
    • A23L5/13General methods of cooking foods, e.g. by roasting or frying using water or steam
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/10General methods of cooking foods, e.g. by roasting or frying
    • A23L5/15General methods of cooking foods, e.g. by roasting or frying using wave energy, irradiation, electrical means or magnetic fields, e.g. oven cooking or roasting using radiant dry heat
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/20Removal of unwanted matter, e.g. deodorisation or detoxification
    • A23L5/21Removal of unwanted matter, e.g. deodorisation or detoxification by heating without chemical treatment, e.g. steam treatment, cooking
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23LFOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L5/00Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
    • A23L5/20Removal of unwanted matter, e.g. deodorisation or detoxification
    • A23L5/27Removal of unwanted matter, e.g. deodorisation or detoxification by chemical treatment, by adsorption or by absorption
    • A23L5/276Treatment with inorganic compounds
    • AHUMAN NECESSITIES
    • A23FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23VINDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00Food compositions, function of food ingredients or processes for food or foodstuffs
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/90Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation

Abstract

The invention provides a selenium-rich bittern flavored preserved egg and a preparation method thereof, wherein the preparation method comprises the following steps: ultrasonic mixing: performing low-frequency ultrasonic treatment on eggs with ultrasonic frequency of 20-30kHz and ultrasonic intensity of 40-60W/m 2 The ultrasonic time is 10-15min; and (3) wrapping a coating: wrapping the eggs after ultrasonic mixing with selenium-rich salt and quicklime mixture; ultrasonic curing. According to the preparation method of the selenium-enriched bittern flavored salted preserved egg, provided by the invention, the frequency, the intensity and the time of ultrasonic waves are strictly controlled, so that the boundary line between egg white and egg yolk in the egg is blurred, the integrity of egg white and egg yolk is kept, the proteins at the boundary line between the egg white and egg yolk are mixed into the egg white, and the generation of black substances between the egg white and egg yolk in a salted preserved egg finished product is reduced.

Description

Selenium-enriched bittern-flavored salted preserved egg and preparation method thereof
Technical Field
The invention relates to the technical field of egg processing, in particular to a selenium-rich bittern-flavored salted preserved egg and a preparation method thereof.
Background
The salted preserved egg is a traditional flavor egg product in China, and originates from the small flat hometown, sichuan Guangan. Due to the advantages of the polymerized salted eggs and the preserved eggs, the salted eggs have the characteristics of yellow and clear preserved eggs, so that the salted eggs have aromatic flavor, strong egg white taste, fragrant and glutinous yolk Sha Su, crystal clear color and unique taste. Meanwhile, the salted preserved eggs are rich in nutrition, the proportion of amino acids is suitable for the physiological needs of human bodies, and the salted preserved eggs are easy to absorb and rich in various vitamins, minerals and the like. Therefore, the food is deeply favored by consumers, and becomes a unique delicacy food.
The salted preserved egg mainly comprises duck eggs and eggs, the traditional egg curing mode has the problems of long production period, poor stability of products, single taste of products and the like, and particularly, the production of thicker black substances between egg white and egg yolk in the finished salted preserved egg products prepared in the traditional mode seriously affects the quality and taste of the salted preserved egg; at present, the development of selenium-enriched products is an object of the enthusiasm of researchers, but selenium-enriched eggs are used as raw materials to be processed into selenium-enriched salt preserved eggs, the development cost of the selenium-enriched eggs is increased, and the generated economic benefit is low, so that the development of the market is not facilitated.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the black substances are thicker between egg white and egg yolk in the finished salted preserved egg product prepared by the preparation method in the prior art, thereby providing the preparation method of the selenium-enriched bittern flavored salted preserved egg.
The invention also provides a selenium-enriched bittern flavored preserved egg.
Therefore, the invention provides a preparation method of a selenium-rich bittern flavored preserved egg, which comprises the following steps:
ultrasonic mixing: performing low-frequency ultrasonic treatment on eggs with ultrasonic frequency of 20-30kHz and ultrasonic intensity of 40-60W/m 2 The ultrasonic time is 10-15min;
and (3) wrapping a coating: wrapping the eggs after ultrasonic mixing with selenium-rich salt and quicklime mixture; and
and (5) ultrasonic curing.
Further, the operation of the wrap coating is: soaking egg in selenium-rich brine for 10-15 days, taking out, air drying, and placing on surface of the egg at 4-10deg.C for 3-5 days.
Further, the selenium-enriched bittern solution comprises: 1-2 parts of selenomethionine, 1-2 parts of sodium selenate and 80-103 parts of marinade.
Wherein the marinade comprises the following components: the halogen-free water-based composite material comprises, by mass, 10-15 parts of halogen materials, 2-3 parts of salts, 40-50 parts of water and 28-45 parts of ethanol.
Specifically, the marinade comprises, by weight, 5-8 parts of galangal, 2-4 parts of star anise, 0.2-1.2 parts of long pepper, 5-8 parts of dried ginger, 2-3 parts of fructus amomi, 2-3 parts of dried orange peel, 0.2-1.0 part of cassia bark, 0.5-2 parts of rhizoma kaempferiae, 2-4 parts of fennel, 2-4 parts of liquorice, 1-3 parts of angelica dahurica, 1-3 parts of tsaoko cardamon, 0.5-1.5 parts of angelica sinensis, 0.4-1.0 parts of white bean buckle, 2-4 parts of myrcia and 2-4 parts of fragrant pulp.
The preparation method of the selenium-enriched salt brine comprises the following steps:
preparing marinade: mixing the above halogen raw materials in parts by weight, performing superfine grinding, treating the superfine ground halogen raw materials with superheated steam at 150-200deg.C for 20-30 min to break cell wall in the raw materials, adding water, ethanol and salt into the halogen raw materials, and steaming with subcritical water technology for 20-30 min at 130-140deg.C for 20-30 min.
Adding selenomethionine and sodium selenate into the marinade, and uniformly stirring to obtain selenium-enriched salt marinade.
Further, the mass ratio of the eggs to the selenium-enriched salt brine is 1:2-3.
Further, the quicklime mixture comprises: mgCl in parts by mass 2 5-10 parts of Na 2 CO 3 50-60 parts and 20-30 parts of quicklime.
Further, the ultrasonic pickling process comprises the following steps: placing the coated egg in fine sand, performing ultrasonic treatment with ultrasonic frequency of 60-100kHz and ultrasonic intensity of 20-30W/m 2 Ultrasonic treatment for 1-3 hr, stopping ultrasonic treatment, vacuumizing to maintain egg under vacuum pressure less than 0.13MPa for 2-6 hr, and sequentially performing ultrasonic treatmentAnd (5) carrying out sound wave treatment-vacuumizing circulation, and curing for 3-5 days.
Further, in the ultrasonic mixing and ultrasonic curing process, the ultrasonic treatment is stopped for 30-60s after each ultrasonic treatment for 3-5 s.
Further, the ultrasonic mixing step is preceded by the steps of selecting and cleaning eggs: fresh eggs are selected, and then instant cleaning and sterilization are carried out by adopting superheated steam, wherein the temperature of the superheated steam is 140-150 ℃ and the time is 30-50s.
Further, the ultrasonic pickling step further comprises the steps of cleaning, sterilizing and packaging, wherein:
cleaning and sterilizing: placing the pickled eggs into a disinfectant for cleaning for 5-10min, and disinfecting the eggs and removing substances on the surfaces of the eggs;
and (3) packaging: air-drying egg at normal temperature, vacuum packaging, and sterilizing.
The disinfectant may be a mixture of calcium hydroxide, calcium chloride and calcium hypochlorite with an available chlorine content of 30% -38%.
Further, the eggs are one or more of quail eggs, egg eggs, duck eggs, goose eggs and/or pigeon eggs.
The invention also provides the salted preserved eggs prepared by the method.
The technical scheme of the invention has the following advantages:
1. the preparation method of the selenium-enriched bittern flavored salted preserved egg provided by the invention strictly controls the frequency, intensity and time of ultrasonic waves, not only achieves the purpose of keeping the integrity of egg white and egg yolk, but also ensures that proteins at the boundary between the egg white and the egg yolk are mixed into the egg white, and reduces the generation of black substances between the egg white and the egg yolk in the finished salted preserved egg product.
2. The invention provides a preparation method of a selenium-enriched bittern flavored salted preserved egg, which comprises the following steps: the quick lime mixture comprises, by mass, 1-2 parts of selenomethionine, 1-2 parts of sodium selenate, 2-3 parts of salt, 10-15 parts of marinating material, 40-50 parts of water and 28-45 parts of ethanol, wherein the quick lime mixture comprises the following components: mgCl 2 5-10 parts of Na 2 CO 3 50-60 parts of quicklime and 20-30 parts of quicklime, under the condition of salt existence, utilizing osmotic pressure to make selenomethionine and sodium selenate in the halogen liquid enter egg white, and wrapping the surface of the egg whiteThe quick lime can facilitate the selenization reaction of the egg white protein, so that on one hand, the exchange of selenium in selenomethionine and S on cysteine in egg white is promoted, the egg white protein of selenocysteine is obtained, and more organic selenium is formed; on the other hand, selenate ions can perform neutralization reaction with positive ions in the egg white protein to form selenate modified egg white protein, so that organic selenium is increased; na in quicklime mixture 2 CO 3 Can improve the alkalinity of quicklime, improve the decomposition and solidification of protein in preserved eggs, and improve MgCl 2 Can fix gel generated by preserved egg, and has coagulation promoting effect.
3. According to the preparation method of the selenium-enriched bittern flavored salted preserved egg, provided by the invention, in the ultrasonic pickling process, the ultrasonic wave synergistic vacuum technology can enable selenomethionine and sodium selenate in the egg to react rapidly under the ultrasonic condition, so that the reaction efficiency and the reaction rate are improved. The vacuum condition can promote selenomethionine and sodium selenate to further permeate into yolk, and carry out selenizing reaction with proteins in yolk, so that the content of organic selenium in egg white and yolk in salted preserved eggs is improved.
4. According to the preparation method of the selenium-enriched bittern-flavored preserved eggs, provided by the invention, after every 3-5 seconds of ultrasound, the preserved eggs are suspended for 30-60 seconds, intermittent ultrasound can reduce ultrasound overheating, and hot spots generated in the ultrasound process can influence the shaping and quality of the preserved eggs.
5. The preparation method of the selenium-rich bittern-flavor preserved egg provided by the invention can shorten the pickling period of the selenium-rich bittern-flavor preserved egg, and the prepared selenium-rich bittern-flavor preserved egg has the advantages of preserved egg, marinated egg and preserved egg, and has the advantages of strong egg white taste, sha Su fragrance and glutinous yolk, crystal clear color and unique taste.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
Preparing selenium-rich bittern:
1) Preparing a marinating material: 5 parts of galangal, 4 parts of star anise, 0.2 part of long pepper, 5 parts of dried ginger, 3 parts of fructus amomi, 2 parts of dried orange peel, 0.2 part of cassia bark, 2 parts of rhizoma kaempferiae, 2 parts of fennel, 4 parts of liquorice, 1 part of radix angelicae, 3 parts of tsaoko cardamom, 1.5 parts of angelica sinensis, 1.0 part of white bean buckle, 2 parts of myrcia and 2 parts of fragrant pulp;
2) Preparing marinade: mixing the above halogen raw materials in parts by weight, performing superfine grinding, treating the superfine ground halogen raw materials by using superheated steam at a temperature of 200 ℃ for 30 minutes to achieve the purpose of breaking cell walls in the raw materials, and adding water, ethanol and salt into the halogen raw materials, wherein the mass ratio of the halogen raw materials to the water, the ethanol and the salt is 10:50:28:3, and performing cooking by using a subcritical water technology for 30 minutes, wherein the subcritical water treatment temperature is 130 ℃ and the treatment time is 20 minutes;
3) Adding 1 part by mass of selenomethionine and 1 part by mass of sodium selenate into 80 parts by mass of marinade to prepare the selenium-enriched bittern.
Preparing the selenium-rich bittern flavored salt preserved egg:
1) Selecting fresh quail eggs, and performing instant cleaning and sterilization by using superheated steam, wherein the temperature of the superheated steam is 140 ℃ and the time is 30s;
2) Placing cleaned quail eggs into an ultrasonic generator for low-frequency ultrasonic treatment with ultrasonic frequency of 20kHz and ultrasonic intensity of 40W/m 2 The ultrasonic time is 10min;
3) Placing the quail eggs subjected to ultrasonic treatment into the selenium-enriched salt brine, wherein the mass ratio of the quail eggs to the selenium-enriched salt brine is 1:2, soaking for 10 days, taking out cold air, air-drying, then wrapping the surface with a quicklime mixture, and placing for 3 days at 4 ℃, wherein the quicklime mixture is MgCl 2 5 parts by mass of Na 2 CO 3 60 parts by mass and 30 parts by mass of quicklime;
4) Placing eggs coated with selenium-rich salt brine and quicklime mixture in fine sand, and performing ultrasonic treatment with ultrasonic frequency of 60kHz and ultrasonic intensity of 30W/m 2 And (3) ultrasonic treatment is carried out for 1 hour, then ultrasonic treatment is stopped, vacuumizing is carried out, so that the eggs are kept for 2 hours under the vacuum with the pressure of less than 0.13MPa, ultrasonic treatment-vacuumizing circulation is carried out in sequence, and pickling is carried out for 3 days.
5) Washing the salted eggs in a disinfectant for 5min, sterilizing the eggs, removing surface substances of the eggs, and airing the eggs at normal temperature.
Example 2
Preparing selenium-rich bittern:
1) Preparing a marinating material: 8 parts of galangal, 2 parts of star anise, 1.2 parts of long pepper, 8 parts of dried ginger, 2 parts of fructus amomi, 3 parts of dried orange peel, 1.0 part of cassia bark, 0.5 part of rhizoma kaempferiae, 4 parts of fennel, 2 parts of liquorice, 3 parts of radix angelicae, 1 part of tsaoko amomum fruit, 0.5 part of angelica sinensis, 0.4 part of white bean buckle, 4 parts of bay leaves and 4 parts of fragrant pulp;
2) Preparing marinade: mixing the above halogen raw materials in parts by weight, performing superfine grinding, treating the superfine ground halogen raw materials by using superheated steam at a treatment temperature of 150 ℃ for 20 minutes to achieve the purpose of breaking cell walls in the raw materials, and adding water, ethanol and salt into the halogen raw materials, wherein the mass ratio of the halogen raw materials to the water to the ethanol to the salt is 15:40:45:2, and performing cooking by using subcritical water technology for 20 minutes at a subcritical water treatment temperature of 140 ℃ for 30 minutes;
3) Adding 1 part by mass of selenomethionine and 2 parts by mass of sodium selenate into 90 parts by mass of marinade to prepare the selenium-enriched bittern.
Preparing the selenium-rich bittern flavored salt preserved egg:
1) Selecting fresh quail eggs, and performing instant cleaning and sterilization by using superheated steam, wherein the temperature of the superheated steam is 150 ℃ and the time is 30s;
2) Placing cleaned quail eggs into an ultrasonic generator for low-frequency ultrasonic treatment with ultrasonic frequency of 30kHz and ultrasonic intensity of 50W/m 2 During ultrasonic treatmentThe interval is 15min;
3) Placing the quail eggs subjected to ultrasonic treatment into the selenium-enriched salt brine, wherein the mass ratio of the quail eggs to the selenium-enriched salt brine is 1:3, soaking for 15 days, taking out cold air, air-drying, wrapping the surface with a quicklime mixture, and standing for 5 days at 10 ℃ to obtain the quicklime mixture which is MgCl 2 10 parts by mass of Na 2 CO 3 50 parts by mass of a mixture with 20 parts by mass of quicklime;
4) Placing eggs coated with selenium-rich salt brine and quicklime mixture in fine sand, and performing ultrasonic treatment with ultrasonic frequency of 100kHz and ultrasonic intensity of 20W/m 2 And (3) ultrasonic treatment is carried out for 3 hours, then ultrasonic treatment is stopped, vacuum pumping is carried out, so that the eggs are kept for 4 hours under vacuum with the pressure of less than 0.13MPa, ultrasonic treatment-vacuum pumping circulation is carried out in sequence, and pickling is carried out for 5 days.
5) Washing the salted eggs in a disinfectant for 10min, sterilizing the eggs, removing surface substances of the eggs, and airing the eggs at normal temperature.
Example 3
Preparing selenium-rich bittern:
1) Preparing a marinating material: 6 parts of galangal, 3 parts of star anise, 0.8 part of long pepper, 6 parts of dried ginger, 3 parts of fructus amomi, 3 parts of dried orange peel, 0.5 part of cassia bark, 1 part of kaempferia galanga, 3 parts of fennel, 3 parts of liquorice, 2 parts of radix angelicae, 2 parts of tsaoko amomum fruit, 1 part of angelica sinensis, 0.7 part of white bean button, 3 parts of myrcia and 3 parts of fragrant pulp;
2) Preparing marinade: mixing the above halogen raw materials in parts by weight, performing superfine grinding, treating the superfine ground halogen raw materials by using superheated steam at a temperature of 180 ℃ for 25 minutes to achieve the purpose of breaking cell walls in the raw materials, and adding water, ethanol and salt into the halogen raw materials, wherein the mass ratio of the halogen raw materials to the water, the ethanol and the salt is 15:45:30:2, and performing cooking by using subcritical water technology for 25 minutes at a subcritical water treatment temperature of 130 ℃ for 25 minutes;
3) Adding 2 parts by mass of selenomethionine and 2 parts by mass of sodium selenate into 103 parts by mass of marinade to prepare the selenium-enriched bittern.
Preparing the selenium-rich bittern flavored salt preserved egg:
1) Selecting fresh quail eggs, and performing instant cleaning and sterilization by using superheated steam, wherein the temperature of the superheated steam is 150 ℃ and the time is 30s;
2) Placing cleaned quail eggs into an ultrasonic generator for low-frequency ultrasonic treatment with ultrasonic frequency of 30kHz and ultrasonic intensity of 60W/m 2 The ultrasonic time is 10min;
3) Placing the quail eggs subjected to ultrasonic treatment into the selenium-enriched salt brine, wherein the mass ratio of the quail eggs to the selenium-enriched salt brine is 1:3, soaking for 12 days, taking out cold air, air-drying, wrapping the surface with a quicklime mixture, and standing for 5 days at 7 ℃ to obtain the quicklime mixture which is MgCl 2 7 parts by mass of Na 2 CO 3 50 parts by mass and 25 parts by mass of quicklime;
4) Placing eggs coated with selenium-rich salt brine and quicklime mixture in fine sand, and performing ultrasonic treatment with ultrasonic frequency of 80kHz and ultrasonic intensity of 20W/m 2 And (3) ultrasonic treatment is carried out for 2 hours, then ultrasonic treatment is stopped, vacuumizing is carried out, so that the eggs are kept for 3 hours under the vacuum with the pressure of less than 0.13MPa, ultrasonic treatment-vacuumizing circulation is carried out in sequence, and pickling is carried out for 4 days.
5) Washing the salted eggs in a disinfectant for 10min, sterilizing the eggs, removing surface substances of the eggs, and airing the eggs at normal temperature.
Example 4
The same procedure as in example 1 was followed except that the quail eggs were replaced with chicken eggs.
Example 5
The same procedure as in example 1 was followed except that the quail eggs were replaced with duck eggs.
Example 6
The same procedure as in example 1 was followed except that the quail eggs were replaced with goose eggs.
Example 7
The same procedure as in example 1 was followed except that the quail eggs were replaced with pigeon eggs.
Comparative example 1
The same procedure as in example 1 is followed except that the selenium-enriched bittern flavored salted preserved egg is preparedStep 2) in the preparation process, the cleaned quail eggs are placed in an ultrasonic generator for low-frequency ultrasonic treatment, the ultrasonic frequency is 60kHz, and the ultrasonic intensity is 40W/m 2 The ultrasonic time was 10min.
Comparative example 2
The same procedure as in example 1 was repeated except that 1 part by mass of selenomethionine was added to 80 parts by mass of the above-mentioned marinade in step 2) in the preparation of the selenium-enriched bittern solution to prepare selenium-enriched bittern.
Comparative example 3
The same procedure as in example 1 was repeated except that 1 part by mass of selenodipeptide and 1 part by mass of sodium selenate were added to 80 parts by mass of the above-mentioned marinade in step 2) in the preparation of the selenium-enriched bittern solution to prepare selenium-enriched bittern.
Comparative example 4
The same method as in example 1 is characterized in that step 3) in the preparation process of the selenium-enriched bittern flavored salted preserved egg is to put the quail eggs after ultrasonic treatment into the selenium-enriched bittern, soak for 10 days, take out cold air for air drying, and then wrap MgCl on the surface 2 25 parts by mass and Na 2 CO 3 70 parts by mass of a mixture, and left at 4℃for 3 days.
Experimental example
Selenium content in the salted preserved eggs prepared in the examples and the comparative examples is measured, and whether black substances are generated in the salted preserved eggs is observed.
The method for measuring the selenium content comprises the following steps: the selenium content is detected according to the method of national Standard of food safety (GB 5009.93-2017), and the specific detection method is as follows:
sample digestion: 10g of the selenium-enriched eggs prepared in the above way are respectively weighed and placed in an conical flask, 10mL of nitric acid-perchloric acid mixed acid (900 mL of nitric acid and 100mL of perchloric acid are uniformly mixed) and 10 glass beads are added, and the mixture is covered on a surface dish for cold digestion overnight. Heating on an electric heating plate the next day, and adding nitric acid in time. When the solution becomes clear and colorless with the generation of white smoke, the solution is continuously heated until the residual volume is about 2mL and can not be evaporated to dryness. Cooled, 5mL of hydrochloric acid solution (6 mol/L) was added, and heating was continued until the solution became clear and colorless with the appearance of white smoke.
After cooling, the mixture was transferred to a 10mL volumetric flask, 2.5mL of potassium ferricyanide solution (100 g/L) was added, the volume was determined with water, and the mixture was mixed well to be measured. Simultaneously performing reagent blank test
Parameters of an atomic fluorescence spectrometer (a selenium-containing hollow cathode lamp) are adjusted: negative high pressure 340V; the lamp current is 100mA; an atomization temperature of 800 ℃; furnace height 8mm; the flow rate of carrier gas is 500mL/min; shielding gas flow rate 1000mL/min; a measurement mode standard curve method; reading mode peak area; delay time 1s; reading time 15s; the liquid adding time is 8s; the sample injection volume was 2mL.
And (3) manufacturing a standard curve:
hydrochloric acid solution (25 ml hydrochloric acid is slowly added into 475ml water and uniformly mixed) is used as current carrying, sodium borohydride alkali solution (8 g/L) is used as reducing agent, standard series of zero tubes are continuously used for sample injection, after the reading number is stable, standard series of standard selenium solutions are respectively introduced into an instrument according to the sequence from low to high in mass concentration, the fluorescence intensity of the standard series of selenium solutions is measured, the mass concentration is used as an abscissa, and the fluorescence intensity is used as an ordinate, so that a standard curve is manufactured.
Sample measurement:
under the same experimental conditions as those of the standard series of solutions, the blank solution and the sample solution are respectively introduced into the instrument, and the fluorescence intensity is measured, and the standard series is compared and quantified.
The selenium content in the sample is calculated as follows:
wherein:
x-the selenium content of the sample in milligrams per kilogram;
rho-the mass concentration of selenium in the sample solution in micrograms per liter (μg/L);
ρ0) -the mass concentration of selenium in the blank solution in micrograms per liter (μg/L);
v-total volume of sample digest in milliliters (mL);
m-sample weighing, in grams (g);
1000-conversion coefficient.
The specific results are shown in Table 1.
TABLE 1
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (6)

1. The preparation method of the selenium-rich bittern-flavored salted preserved egg is characterized by comprising the following steps of:
ultrasonic mixing: performing low-frequency ultrasonic treatment on eggs with ultrasonic frequency of 20-30kHz and ultrasonic intensity of 40-60W/m 2 The ultrasonic time is 10-15min;
and (3) wrapping a coating: wrapping the eggs after ultrasonic mixing with selenium-rich salt and quicklime mixture; and
ultrasonic curing;
wherein, the operation of parcel coating does: soaking eggs in selenium-rich brine for 10-15 days, taking out, air drying, wrapping quicklime mixture on the surface, and standing for 3-5 days at 4-10deg.C;
the selenium-enriched bittern solution comprises: 1-2 parts of selenomethionine, 1-2 parts of sodium selenate and 80-103 parts of marinade by mass;
the ultrasonic pickling process comprises the following steps: placing the coated egg in fine sand, performing ultrasonic treatment with ultrasonic frequency of 60-100kHz and ultrasonic intensityIs 20-30W/m 2 The ultrasonic treatment time is 1-3 hours, then the ultrasonic treatment is stopped, and the vacuum pumping is carried out, so that the eggs are kept for 2-6 hours under the vacuum with the pressure of less than 0.13MPa, and the ultrasonic treatment-vacuum pumping circulation is carried out in sequence, and the eggs are salted for 3-5 days;
in the ultrasonic mixing and ultrasonic curing process, the ultrasonic treatment is stopped for 30-60s after each ultrasonic treatment for 3-5 s.
2. The method for preparing selenium-enriched bittern flavored preserved eggs according to claim 1, wherein the quicklime mixture comprises: mgCl in parts by mass 2 5-10 parts of Na 2 CO 3 50-60 parts and 20-30 parts of quicklime.
3. The method for preparing a selenium-enriched bittern flavored salted preserved egg of claim 1, further comprising the steps of selecting and cleaning eggs before the ultrasonic mixing step: fresh eggs are selected, and then instant cleaning and sterilization are carried out by adopting superheated steam, wherein the temperature of the superheated steam is 140-150 ℃ and the time is 30-50s.
4. The method for preparing a selenium-enriched bittern flavored salted preserved egg of claim 1, further comprising the steps of cleaning, sterilizing and packaging after the ultrasonic curing step, wherein:
cleaning and sterilizing: placing the pickled eggs into a disinfectant for cleaning for 5-10min, and disinfecting the eggs and removing substances on the surfaces of the eggs;
and (3) packaging: air-drying egg at normal temperature, vacuum packaging, and sterilizing.
5. The method for preparing the selenium-enriched bittern-flavored preserved egg according to claim 1 or 2, wherein the egg is one or more of quail egg, duck egg, goose egg and/or pigeon egg.
6. A salted preserved egg produced by the method of any one of claims 1 to 5.
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