CN112080017A - Method for preparing dissolved agar by normal pressure heat treatment - Google Patents

Method for preparing dissolved agar by normal pressure heat treatment Download PDF

Info

Publication number
CN112080017A
CN112080017A CN202010884541.0A CN202010884541A CN112080017A CN 112080017 A CN112080017 A CN 112080017A CN 202010884541 A CN202010884541 A CN 202010884541A CN 112080017 A CN112080017 A CN 112080017A
Authority
CN
China
Prior art keywords
agar
heat treatment
powder
dissolved agar
normal pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010884541.0A
Other languages
Chinese (zh)
Other versions
CN112080017B (en
Inventor
倪辉
谢杉玉
梁懿
姜泽东
朱艳冰
胡阳
杨远帆
伍菱
李清彪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jimei University
Original Assignee
Jimei University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jimei University filed Critical Jimei University
Priority to CN202010884541.0A priority Critical patent/CN112080017B/en
Priority claimed from CN202010884541.0A external-priority patent/CN112080017B/en
Publication of CN112080017A publication Critical patent/CN112080017A/en
Application granted granted Critical
Publication of CN112080017B publication Critical patent/CN112080017B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00Processes of treating or compounding macromolecular substances
    • C08J3/02Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/05Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2305/00Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2301/00 or C08J2303/00
    • C08J2305/12Agar-agar; Derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2405/00Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2405/00Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • C08J2405/02Dextran; Derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2405/00Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • C08J2405/04Alginic acid; Derivatives thereof

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Jellies, Jams, And Syrups (AREA)

Abstract

The invention relates to a method for preparing dissolved agar by normal pressure heat treatment, which comprises the following steps: mixing agar powder with other edible colloid powder to obtain compound powder; mixing the compound powder with hot water, uniformly stirring, and then carrying out heat treatment to obtain sol; and drying, crushing and sieving the sol to obtain the dissolved agar. The method can promote the application of agar in food.

Description

Method for preparing dissolved agar by normal pressure heat treatment
Technical Field
The invention relates to the technical field of water agar preparation, in particular to a method for preparing dissolved agar by normal-pressure heat treatment.
Background
Agar, a polysaccharide substance extracted from the cell wall of red algae, the main components of which include agarose and agar gel; has wide application in the fields of food, biochemistry, medicine and the like. Usually, the agar has a dissolution temperature of 95 ℃ or higher and a gel strength of more than 1000g cm-2Although it can be used as a thickener or stabilizer in baking and beverage industries, it is necessary to lower the agar dissolution temperature to 90 ℃ or lower and to lower the gel strength to 800 g/cm in some foods such as dairy products-2The following can be conveniently applied.
In the related technology, the dissolution temperature can be effectively reduced by adopting technologies such as screw extrusion and the like, but the agar has darker color and large gel strength, and the application is influenced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a method for preparing dissolved agar by normal pressure heat treatment. The method can solve the problems of color deepening and high gel strength of low-temperature dissolved agar.
To this end, according to an embodiment of the invention, the invention proposes a method for preparing dissolved agar by means of an atmospheric-pressure heat treatment, comprising the following steps:
(1) mixing agar powder with other edible colloid powder to obtain compound powder;
(2) mixing the compound powder with hot water, uniformly stirring, and then carrying out heat treatment to obtain sol;
(3) and drying, crushing and sieving the sol to obtain the dissolved agar.
According to the method for preparing the dissolved agar by the normal-pressure heat treatment, disclosed by the embodiment of the invention, the heat treatment is carried out after compounding the agar, so that the structure is recombined, the ordered structure is changed into the disordered structure, the dissolving temperature is effectively reduced under normal pressure, and the defects of agar color deepening and large gel strength are obviously relieved compared with an improved agar product under high temperature and high pressure.
In addition, the method for preparing dissolved fat by normal pressure heat treatment according to the above embodiment of the present invention may further have the following additional technical features:
according to the embodiment of the invention, in the step (1), the other edible colloid is carrageenan, sodium alginate or konjac glucomannan.
According to the embodiment of the invention, in the step (1), the ratio of the addition amount of the agar powder in the compound powder is less than 90%.
According to the embodiment of the invention, in the step (2), the material-liquid ratio of the compound powder to the hot water is 1: 6.
According to the embodiment of the invention, in the step (2), an electric stirrer is adopted for stirring, the stirring speed is 200-400 r/min, and the stirring time is 5 min.
According to the embodiment of the invention, in the step (2), the heat treatment is carried out by adopting an electric oven, the temperature of the electric oven is 120 ℃, and the treatment time is 1.5 h.
According to the embodiment of the invention, in the step (3), an electric heating constant-temperature air blowing drying oven is adopted for drying, the temperature is 100 ℃, and the drying is carried out until the weight is constant.
According to an embodiment of the present invention, in the step (3), the sieved mesh is 80 mesh.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart according to an embodiment of the present invention;
FIG. 2 is a graph comparing the effects of the products according to example 5 of the present invention and a comparative example.
Detailed Description
The technical solution of the present invention is illustrated by specific examples below. It is to be understood that one or more method steps mentioned in the present invention do not exclude the presence of other method steps before or after the combination step or that other method steps may be inserted between the explicitly mentioned steps; it should also be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the invention have been shown, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The test materials adopted by the invention are all common commercial products and can be purchased in the market.
Among them, the test for dissolving agar employs:
placing dissolved agar sieved with 80 mesh sieve into test tube, dispersing in water under stirring, boiling for 15min until completely dissolved, and cooling at 2-4 deg.C overnight to obtain completely dissolved colloid. Respectively placing a small glass bead on each gel of the completely dissolved colloid, placing the test tube in a water bath at 30 ℃ for 10min, then raising the temperature at the speed of raising the temperature by 1 ℃ per minute, and when the small glass beads fall to the bottom of the test tube, the temperature is the dissolving temperature.
Putting dissolved agar sieved by a 80-mesh sieve into a beaker, preparing 300mL of compound glue solution with the mass fraction of 1.5%, pouring the mixed glue solution into 3 100mL beakers in equal amount for cooling, covering a watch glass after gel is formed, placing the beaker upside down at room temperature for 15h, measuring the gel strength on a gel strength tester, wherein the gel strength is measured by the mass fraction of 1.5% of compound colloid (dry basis) in 15-20sMass of anti-tamper code (g) and surface area of lower end of device stem (cm)2) The ratio is expressed in g cm-2
The dissolved agar samples were passed through a 40 mesh standard screen and the whiteness was measured by a whiteness meter.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
Agar addition 90%:
(1) mixing 90% of agar powder and 10% of carrageenan powder to obtain compound powder;
(2) mixing 100g of the compound powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 300r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving with a 80-mesh sieve to obtain the dissolved agar.
In this example, the whiteness of the dissolved agar was 34%, the dissolution temperature was 91 ℃ and the gel strength was 835g cm-2
Example 2
Agar addition 70%:
(1) mixing 70% agar powder and 30% sodium alginate powder to obtain compound powder;
(2) mixing 100g of the compound powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 300r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving with a 80-mesh sieve to obtain the dissolved agar.
In this example, the whiteness of the dissolved agar was 28%, the dissolution temperature was 88 ℃ and the gel strength was 466g cm-2
Example 3
Agar addition 50%:
(1) mixing 50% agar powder and 50% konjac powder to obtain compound powder;
(2) mixing 100g of the compound powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 250r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving with a 80-mesh sieve to obtain the dissolved agar.
In this example, the whiteness of the dissolved agar was 19%, the dissolution temperature was 86 ℃ and the gel strength was 395g cm-2
Example 4
Agar addition 30%:
(1) mixing 30% agar powder and 50% sodium alginate powder to obtain compound powder;
(2) mixing 100g of the compound powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 400r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving with a 80-mesh sieve to obtain the dissolved agar.
In this example, the whiteness of the dissolved agar was 28%, the dissolution temperature was 86 ℃ and the gel strength was 247g cm-2
Example 5
Agar addition 10%:
(1) mixing 10% agar powder and 90% carrageenan powder to obtain compound powder;
(2) mixing 100g of the compound powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 400r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving with a 80-mesh sieve to obtain the dissolved agar.
In this example, the whiteness of the dissolved agar was 37%, the dissolution temperature was 83 ℃ and the gel strength was 318g cm-2
Comparative example
Agar addition 100%:
(1) weighing 100g of agar powder;
(2) mixing the powder with 600mL of hot water at 100 ℃, stirring for 5min at the speed of 400r/min by using an electric stirrer, and then carrying out heat treatment for 1.5h by using an electric oven, wherein the temperature of the electric oven is set to be 120 ℃ to obtain sol;
(3) and (3) placing the sol in an electric heating constant-temperature air blast drying oven at 100 ℃ to dry to constant weight, crushing, and sieving by a 80-mesh standard sieve to obtain the dissolved agar.
In this comparative example, the whiteness of the dissolved agar was 29%, the dissolution temperature was 94 ℃ and the gel strength was 850g cm-2
To sum up, with reference to the above examples 1-5 and FIG. 2, when the agar content in the compounded colloidal powder is greater than 90%, the dissolution temperature is higher than 90 ℃, and the gel strength is greater than 800g cm-2(ii) a When the agar accounts for less than 90% of the compound colloid powder, the dissolution temperature is lower than 90 ℃, and the gel strength is less than 800g cm-2. When the agar is compounded with other edible colloids, the dissolved agar meeting the production requirements of foods can be obtained when the proportion of the added amount of the agar in the compounded colloid powder is less than 90 percent.
According to the method for preparing the dissolved agar by the normal-pressure heat treatment, disclosed by the embodiment of the invention, the heat treatment is carried out after compounding the agar, the recombination of the structure is realized, the ordered structure is changed into the disordered structure, the dissolving temperature is effectively reduced under normal pressure, and the defects of agar color deepening and large gel strength are obviously relieved compared with an improved agar product under high temperature and high pressure.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A method for preparing dissolved agar by normal pressure heat treatment is characterized by comprising the following steps:
(1) mixing agar powder with other edible colloid powder to obtain compound powder;
(2) mixing the compound powder with hot water, uniformly stirring, and then carrying out heat treatment to obtain sol;
(3) and drying, crushing and sieving the sol to obtain the dissolved agar.
2. The method for preparing dissolved agar according to the heat treatment under normal pressure as claimed in claim 1, wherein in the step (1), the other edible colloid is carrageenan, sodium alginate or konjac gum.
3. The method for preparing dissolved agar by heat treatment under normal pressure according to claim 1, wherein in the step (1), the ratio of the addition amount of the agar powder in the compound powder is less than 90%.
4. The method for preparing dissolved agar by heat treatment under normal pressure according to claim 1, wherein in the step (2), the feed-liquid ratio of the compound powder to the hot water is 1: 6.
5. The method for preparing dissolved agar through normal pressure heat treatment according to any one of claims 1 to 4, wherein in the step (2), an electric stirrer is adopted for stirring, the stirring speed is 200-400 r/min, and the stirring time is 5 min.
6. The method for preparing dissolved agar by heat treatment under atmospheric pressure according to any one of claims 1 to 4, wherein in the step (2), the heat treatment is carried out by heating in an electric oven at a temperature of 120 ℃ for 1.5 hours.
7. The method for preparing dissolved agar by ordinary pressure heat treatment according to claim 1, wherein in the step (3), the drying is carried out by using an electric heating constant temperature air blast drying oven at a temperature of 100 ℃ to a constant weight.
8. The method for preparing dissolved agar by atmospheric pressure heat treatment according to claim 1, wherein in the step (3), the sieve is 80 mesh.
CN202010884541.0A 2020-08-28 Method for preparing dissolved agar by normal pressure heat treatment Active CN112080017B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010884541.0A CN112080017B (en) 2020-08-28 Method for preparing dissolved agar by normal pressure heat treatment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010884541.0A CN112080017B (en) 2020-08-28 Method for preparing dissolved agar by normal pressure heat treatment

Publications (2)

Publication Number Publication Date
CN112080017A true CN112080017A (en) 2020-12-15
CN112080017B CN112080017B (en) 2024-07-09

Family

ID=

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL370343A1 (en) * 2001-11-01 2005-05-16 Gelex Synergistic effect between agar with low gel strength and guar flours and the method of producing one such composition
CN103421198A (en) * 2013-07-23 2013-12-04 东北农业大学 Preparation method and application of low-temperature dissolving agar
CN105995948A (en) * 2016-05-13 2016-10-12 东北农业大学 Agar compound colloid being dissoluble at low temperature and high in gelling strength and preparation method thereof
CN106977752A (en) * 2017-05-05 2017-07-25 青岛德慧海洋生物科技有限公司 The preparation method of low-temperature instant agar
CN108690202A (en) * 2018-06-21 2018-10-23 福建省天源兴达食品有限公司 A kind of manufacture craft of low-temperature instant agar
CN109054053A (en) * 2018-06-28 2018-12-21 福建省天源兴达食品有限公司 A kind of processing technology of high-gel strength agar
CN110613120A (en) * 2019-10-17 2019-12-27 汕尾市维明生物科技股份有限公司 Preparation process of low-temperature instant agar

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL370343A1 (en) * 2001-11-01 2005-05-16 Gelex Synergistic effect between agar with low gel strength and guar flours and the method of producing one such composition
CN103421198A (en) * 2013-07-23 2013-12-04 东北农业大学 Preparation method and application of low-temperature dissolving agar
CN105995948A (en) * 2016-05-13 2016-10-12 东北农业大学 Agar compound colloid being dissoluble at low temperature and high in gelling strength and preparation method thereof
CN106977752A (en) * 2017-05-05 2017-07-25 青岛德慧海洋生物科技有限公司 The preparation method of low-temperature instant agar
CN108690202A (en) * 2018-06-21 2018-10-23 福建省天源兴达食品有限公司 A kind of manufacture craft of low-temperature instant agar
CN109054053A (en) * 2018-06-28 2018-12-21 福建省天源兴达食品有限公司 A kind of processing technology of high-gel strength agar
CN110613120A (en) * 2019-10-17 2019-12-27 汕尾市维明生物科技股份有限公司 Preparation process of low-temperature instant agar

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李海燕: "琼脂/魔芋胶复配的理化性质及力学性能研究", 《现代食品》 *

Similar Documents

Publication Publication Date Title
CN103461754B (en) High-temperature-resistant heat-resisting fruit jam made of fresh pulp and manufacturing method of high-temperature-resistant heat-resisting fruit jam
CN107324346B (en) A kind of preparation method of high-specific surface area high oil absorption value silica
CN104448405B (en) A kind of polysaccharide/alcohol soluble protein composite membrane and preparation method thereof
CN108740121A (en) A kind of bored yellow machine of visible intelligent type yellow tea
CN102719035A (en) Special reinforcing composite calcium carbonate for polyvinyl chloride pipes
CN112080017A (en) Method for preparing dissolved agar by normal pressure heat treatment
CN104261799B (en) Full porcelain flameproof ware of a kind of high pressure resistant high strength and preparation method thereof
CN111289342A (en) Bead blasting wall material capable of regulating and controlling burst pressure and measuring method of burst pressure
CN112080017B (en) Method for preparing dissolved agar by normal pressure heat treatment
CN105254337B (en) It is a kind of that the method that high colour developing zirconium silicate wraps up carbon black colorant is prepared by carbon source of string
CN111393874A (en) Method for producing high-temperature-resistant zirconium iron red pigment by electrically melting zirconia
CN103173173A (en) Bi-component epoxy adhesive and preparation method thereof
CN104387480A (en) Preparation method of waxy corn modified starch capable of improving quality of frozen food
CN107043245B (en) Ceramic heating sheet
CN209221046U (en) Chlorination equipment is used in a kind of production of the fish peptone that sterilization effect is good
CN104592398A (en) Method for preparing sodium carboxymethyl cellulose
CN109998033A (en) A kind of instant microwave instant noodles and production method
CN108557829A (en) A kind of preparation method of high heat stability silica-based aerogel
CN103601810A (en) New preparation process for medicinal starch
CN104387968A (en) Flame retardant coating used for solar panels
CN106669643A (en) Preparation method for mineral drying agent
CN110938267A (en) Preparation method of weather-resistant flame-retardant environment-friendly water heating blanket hose
CN107043271B (en) Ceramic heater
CN109280510A (en) A kind of low air penetrability butyl sealant
CN104073135B (en) Glass tubing fluorescent lamp water-based coating material and its preparation method and coating method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant