CN113679037A - Method for purifying crude gelatin in donkey-hide gelatin preparation - Google Patents
Method for purifying crude gelatin in donkey-hide gelatin preparation Download PDFInfo
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- CN113679037A CN113679037A CN202110980116.6A CN202110980116A CN113679037A CN 113679037 A CN113679037 A CN 113679037A CN 202110980116 A CN202110980116 A CN 202110980116A CN 113679037 A CN113679037 A CN 113679037A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 20
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- 241000283074 Equus asinus Species 0.000 claims abstract description 99
- 238000009835 boiling Methods 0.000 claims abstract description 87
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 11
- 238000005352 clarification Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
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- PMMYEEVYMWASQN-DMTCNVIQSA-N Hydroxyproline Chemical compound O[C@H]1CN[C@H](C(O)=O)C1 PMMYEEVYMWASQN-DMTCNVIQSA-N 0.000 description 1
- ONIBWKKTOPOVIA-BYPYZUCNSA-N L-Proline Chemical compound OC(=O)[C@@H]1CCCN1 ONIBWKKTOPOVIA-BYPYZUCNSA-N 0.000 description 1
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- QIVBCDIJIAJPQS-VIFPVBQESA-N L-tryptophane Chemical compound C1=CC=C2C(C[C@H](N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-VIFPVBQESA-N 0.000 description 1
- 239000004472 Lysine Substances 0.000 description 1
- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 description 1
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- AYFVYJQAPQTCCC-UHFFFAOYSA-N Threonine Natural products CC(O)C(N)C(O)=O AYFVYJQAPQTCCC-UHFFFAOYSA-N 0.000 description 1
- 239000004473 Threonine Substances 0.000 description 1
- QIVBCDIJIAJPQS-UHFFFAOYSA-N Tryptophan Natural products C1=CC=C2C(CC(N)C(O)=O)=CNC2=C1 QIVBCDIJIAJPQS-UHFFFAOYSA-N 0.000 description 1
- 235000004279 alanine Nutrition 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- ODKSFYDXXFIFQN-UHFFFAOYSA-N arginine Natural products OC(=O)C(N)CCCNC(N)=N ODKSFYDXXFIFQN-UHFFFAOYSA-N 0.000 description 1
- 235000003704 aspartic acid Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 description 1
- 229960003067 cystine Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- PMMYEEVYMWASQN-UHFFFAOYSA-N dl-hydroxyproline Natural products OC1C[NH2+]C(C([O-])=O)C1 PMMYEEVYMWASQN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013922 glutamic acid Nutrition 0.000 description 1
- 239000004220 glutamic acid Substances 0.000 description 1
- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 description 1
- 229960002591 hydroxyproline Drugs 0.000 description 1
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- 235000008521 threonine Nutrition 0.000 description 1
- FGMPLJWBKKVCDB-UHFFFAOYSA-N trans-L-hydroxy-proline Natural products ON1CCCC1C(O)=O FGMPLJWBKKVCDB-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, 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
- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, 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
- A23L13/00—Meat products; Meat meal; Preparation or treatment thereof
- A23L13/20—Meat products; Meat meal; Preparation or treatment thereof from offal, e.g. rinds, skins, marrow, tripes, feet, ears or snouts
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Mycology (AREA)
- Lubricants (AREA)
Abstract
The invention discloses a crude gelatin purification method in donkey-hide gelatin preparation, which comprises the following steps: preparing crude rubber: soaking fresh donkey skin in weak alkaline water with pH of 7.3-7.8 for 2-3 days, changing water every 5-8 hr during soaking to remove donkey hair and impurities, cleaning donkey skin, decocting with boiling water for 20-30 min, softening donkey skin, and cutting into 2-3 cm small blocks; boiling glue: pouring small donkey skin into a pot, and mixing the donkey skin and clear water according to the weight ratio of 1: adding clear water according to the proportion of 6, boiling the clear water, then slowly decocting the clear water with soft fire, and decocting the donkey skin in boiling water of 100-; clarifying and removing impurities: the boiled glue is poured into a centrifuge, and grease and sediment in the glue are attached to a disc of the centrifuge by utilizing the high-speed rotation of the centrifuge.
Description
Technical Field
The invention relates to the technical field of donkey-hide gelatin preparation, in particular to a method for purifying crude gelatin in donkey-hide gelatin preparation.
Background
The donkey-hide gelatin is mostly composed of ossein, the pure donkey-hide gelatin is prepared by decocting donkey skin through a complex process, the donkey-hide gelatin is rich in nutrition, contains various amino acids inside, obtains various amino acids after hydrolysis, such as lysine, arginine, histidine, cystine, tryptophan, hydroxyproline, aspartic acid, threonine, serine, glutamic acid, proline, glycine, alanine, etc., therefore, the donkey-hide gelatin also becomes one of the popular nutriments, when the traditional donkey-hide gelatin is prepared and purified, alum is usually used for adsorbing and precipitating impurities in the glue, the impurity removal effect is poor, the purity of the finished donkey-hide gelatin product cannot be improved, and simultaneously, when froth fishing is carried out, a strainer is used for fishing in the traditional fishing mode, and partial glue is not taken out in the fishing process, so that the waste of the glue is caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for purifying crude gelatin in donkey-hide gelatin preparation, which can improve the purity of donkey-hide gelatin and effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for purifying crude gelatin in donkey-hide gelatin preparation comprises the following steps:
s1) preparing crude rubber: soaking fresh donkey skin in weak alkaline water with pH of 7.3-7.8 for 2-3 days, changing water every 5-8 hr during soaking to remove donkey hair and impurities, cleaning donkey skin, decocting with boiling water for 20-30 min, softening donkey skin, and cutting into 2-3 cm small blocks;
s2) boiling glue: pouring small donkey skin into a pot, and mixing the donkey skin and clear water according to the weight ratio of 1: adding clear water according to the proportion of 6, boiling the clear water, then slowly decocting the clear water with soft fire, and decocting the donkey skin in boiling water of 100-;
s3) clarifying and impurity removing: pouring the boiled glue into a centrifuge, attaching grease and sediment inside the glue to a disc of the centrifuge by utilizing the high-speed rotation of the centrifuge, filtering the centrifuged glue by utilizing linen, standing the filtered glue for 2-3 hours to enable the grease which is not removed in the glue to float on the upper layer of the glue, and using steel ice to sweep the grease on the surface of the glue to enable the grease to be attached to the surface of the steel ice after being solidified;
s4) foaming and purifying: pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water, boiling the glue by using a big fire, then slowly boiling the glue by using a small fire, and wrapping steel ice by using clean burlap to adsorb floating foam when the floating foam floats above the glue;
s5) glue discharging: use the small fire to boil glue and glue thick state, at inside flavouring agent and the sedan-chair stinking agent of adding of glue, pour the glue solution into wooden mold after the stirring, air naturally under the environment of normal atmospheric temperature shade, utilize centrifuge centrifugation at clarification edulcoration in-process, the burlap filters, multiple edulcoration modes such as steel ice absorption are got rid of the inside impurity of glue, improve the purity of donkey-hide gelatin, guarantee the off-the-shelf quality of donkey-hide gelatin, it adsorbs floating the foam to use burlap parcel steel ice to float the foam to salvage the in-process floating the foam, the floating foam of high temperature carries out the automatic shrink meeting microthermal steel ice rear surface, adhere to the surface at the burlap, can the waste of glue when the inside impurity of maximum removal glue.
As a preferred technical scheme of the invention, when donkey skin is soaked in the crude gelatin preparation process, the raw gelatin is prepared by mixing flour and weak alkaline water 1:10, adding flour into weak alkaline water, and partially taking out impurities of grease attached to the donkey skin.
As a preferable technical scheme of the invention, the glue is stirred every 20-30 minutes in the boiling process of the glue, so that the glue is prevented from sticking to a pot in the boiling process.
As a preferable technical scheme of the invention, clear water is added into the glue every 2-3 hours in the boiling process of the glue, and the weight ratio of the added clear water to the initial clear water is 1:10, so that the phenomenon that the water in the glue is evaporated too much to dry the pot is prevented.
As a preferable technical scheme of the invention, the pH value of the inside of the glue needs to be detected every 5-8 hours in the boiling process of the glue, sodium bicarbonate needs to be added for regulation when the pH value is lower than 7.2, and white vinegar needs to be added for regulation when the pH value is higher than 7.8, so that the pH value of the glue is ensured to be always between 7.2-7.8 in the boiling process of the glue, the pH value of the glue is regulated, and the hydrolysis of collagen in the donkey skin is facilitated.
As a preferred technical scheme of the invention, when the glue is clarified and purified, the donkey skin remaining in the glue is filtered by using the coarse linen, then the grease in the glue is filtered by using the fine linen, and the glue is filtered in a fractional manner, so that the filtering efficiency of the glue is improved.
As a preferred technical scheme of the invention, the residual donkey hide obtained by filtering during clarification and impurity removal can be boiled again by adding clear water after being cleaned, so that collagen in the donkey hide can be fully hydrolyzed, and waste is reduced.
As a preferable technical scheme of the invention, during the foam-making purification, after the primary floating foam is fished, 500 ml of mountain spring water is added into the glue again, after the glue is stirred by the stirring rod, the floating foam is fished again after the glue is boiled again, and the circulation is performed for 3-5 times until the floating foam does not appear in the glue any more, and the floating foam is fished for many times, so that the purity of the glue is improved.
As a preferred technical scheme of the invention, before the glue solution is poured into the mould, the weight ratio of the soybean oil to the glue solution 1: soybean oil is added into the glue solution according to the weight ratio of 100, so that the viscosity of the glue solution can be reduced, and the glue solution can be poured into a mold conveniently.
Compared with the prior art, the invention has the beneficial effects that: the method for purifying crude gelatin in the preparation of donkey-hide gelatin has the following advantages:
1. soaking fresh donkey skin in weak alkaline water with the pH value of 7.3-7.8 for 2-3 days, changing water every 5-8 hours in the soaking process to remove donkey hair and impurities, cleaning the donkey skin, boiling the donkey skin for 20-30 minutes by using boiling water, cutting the donkey skin into small squares of 2-3 cm after softening the donkey skin for later use, and soaking the donkey skin according to the ratio of 1:10, the flour is added into the weak alkaline water according to the proportion, so that the oil on the surface part of the donkey skin can be adsorbed, the peculiar smell of the donkey skin is removed, and the preliminary purification of the donkey-hide gelatin is realized.
2. Pouring the boiled glue into a centrifuge, attaching grease and sediment in the glue to a disc of the centrifuge by using high-speed rotation of the centrifuge, filtering the centrifuged glue by using burlap, filtering donkey skin remaining in the glue by using coarse burlap, filtering the grease in the glue by using fine burlap, cleaning the remaining donkey skin, adding clear water again for boiling, standing the filtered glue for 2-3 hours to enable the grease which is not removed in the glue to float on the upper layer of the glue, using steel ice to sweep the grease on the surface of the glue to enable the grease to be attached to the surface of the steel ice after being solidified, and removing impurities in the glue by using various impurity removal modes such as centrifugation of the centrifuge, burlap filtration, steel ice adsorption and the like in the process of clarifying and impurity removal to improve the purity of the donkey-hide glue and ensure the quality of a donkey-hide product, can recycle the donkey hide obtained by filtering, and reduce the waste of materials.
3. Pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5's proportion adds spring water, changes to use the small fire to boil after making the glue boiling with big fire earlier, when floating the foam in the glue top, uses clean burlap parcel steel ice to adsorb the floating foam, uses burlap parcel steel ice to adsorb the floating foam at floating foam salvage in-process, the floating foam of high temperature is meetting microthermal steel ice rear surface and is carried out automatic shrink, the surface at the burlap adheres to, reduce the waste of glue when getting rid of the inside impurity of glue that can the at utmost.
Drawings
FIG. 1 is a schematic diagram of the steps of a crude gelatin purification method in the preparation of donkey-hide gelatin according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a technical solution:
the first embodiment is as follows:
soaking fresh donkey skin in weak alkaline water with pH of 7.3 for 2 days, and mixing flour and weak alkaline water according to the weight ratio of 1:10, flour is added to the proportion in weak alkaline water, and flour can adsorb partial grease and impurity on donkey hide surface, and it is once to change water every 5 hours in the soaking process, gets rid of donkey hair and impurity, boils 20 minutes with boiling water after wasing the donkey hide, cuts into the little square of 2 centimetres after the donkey hide softens for use, reduces the size of donkey hide, improves donkey hide system efficiency, pours the donkey hide of fritter into the pot, compares 1 according to donkey hide and clear water weight: 6, adding clear water, boiling the clear water to boil, then slowly boiling the water with slow fire, boiling the donkey skin in 100 ℃ boiling water for 60 hours, stirring the glue every 20 minutes in the glue boiling process, avoiding the glue from sticking to a pot in the boiling process, adding the clear water into the glue every 2 hours in the glue boiling process, wherein the weight ratio of the added clear water to the initial clear water is 1:10, preventing the water in the glue from evaporating too much to cause a dry pot, pouring the boiled glue into a centrifuge, utilizing the high-speed rotation of the centrifuge to make the grease and sediment in the glue attach to a disc of the centrifuge, then filtering the centrifuged glue by using a linen, standing the filtered glue for 2 hours to make the grease which is not removed in the glue float on the upper layer of the glue, using steel ice to sweep the grease on the surface of the glue, making the grease attach to the surface of the steel ice after the grease is solidified, and further removing the grease in the glue, pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water according to a proportion, boiling the glue by using big fire, then boiling the glue by using small fire, absorbing the froth by using clean burlap wrapped steel ice when the froth floats above the glue, performing primary froth salvaging, adding 500 ml of spring water into the glue again, stirring by using a stirring rod, salvaging the froth again after the glue is boiled out of the froth again, circulating for 3 times until the froth does not appear in the glue, performing repeated salvaging of the froth, improving the purity of the glue, detecting the pH value inside the glue every 5 hours in the glue boiling process, adding baking soda for regulation when the pH value is lower than 7.2, adding white vinegar for regulation when the pH value is higher than 7.8, ensuring that the pH value in the glue boiling process is always between 7.2 and 7.8, regulating the acid of the glue, and facilitating the hydrolysis of collagen inside the donkey hide, boiling the glue with slow fire to be in a viscous state, adding a flavoring agent and a car odor agent into the glue, uniformly stirring, pouring the glue into a wood mold, and naturally drying in the cool and cool environment at normal temperature.
When soaking the donkey-hide, add flour in weak base aquatic, can adsorb donkey-hide surface part grease, get rid of the peculiar smell of donkey-hide, realize the preliminary purification of donkey-hide, utilize centrifuge centrifugation at clarification edulcoration in-process, the burlap filters, multiple edulcoration modes such as steel ice absorption are got rid of the inside impurity of glue, improve the purity of donkey-hide, guarantee the off-the-shelf quality of donkey-hide, and simultaneously, use burlap parcel steel ice to adsorb the froth at froth salvage in-process, the froth of high temperature carries out automatic shrink meeting microthermal steel ice rear surface, adhere to the surface at the burlap, can the at utmost reduce the waste of glue when getting rid of the inside impurity of glue.
Example two:
soaking fresh donkey skin in weak alkaline water with pH of 7.4 for 2.5 days, and mixing flour and weak alkaline water in a ratio of 1:10, flour is added to the proportion in weak alkaline water, and flour can adsorb partial grease and impurity on donkey hide surface, and it is once to change water every 6 hours in the soaking process, gets rid of donkey hair and impurity, boils 25 minutes with boiling water after wasing the donkey hide, cuts into the little square of 2 centimetres after the donkey hide softens for use, reduces the size of donkey hide, improves donkey hide system efficiency, pours the donkey hide of fritter into the pot, compares 1 according to donkey hide and clear water weight: 6, adding clear water, boiling the clear water to boil, then slowly boiling the water with slow fire, boiling the donkey skin in 105 ℃ boiling water for 65 hours, stirring the glue every 20 minutes in the glue boiling process, avoiding the glue from sticking to a pot in the boiling process, adding the clear water into the glue every 2.5 hours in the glue boiling process, wherein the weight ratio of the added clear water to the initial clear water is 1:10, preventing the water in the glue from evaporating too much to cause a pot drying, pouring the boiled glue into a centrifuge, utilizing the high-speed rotation of the centrifuge to make the grease and sediment in the glue attach to a disc of the centrifuge, then utilizing a linen to filter the centrifuged glue, standing the filtered glue for 2.5 hours to make the grease which is not removed in the glue float on the upper layer of the glue, using steel ice to sweep the grease on the surface of the glue, making the grease attach to the surface of the steel ice after the grease is solidified, and further removing the grease in the glue, pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water according to a proportion, boiling the glue by using big fire, then boiling the glue by using small fire, absorbing the froth by using clean burlap wrapped steel ice when the froth floats above the glue, performing primary froth salvaging, adding 400 ml of spring water into the glue again, stirring by using a stirring rod, salvaging the froth again after the glue is boiled out of the froth again, circulating for 4 times until the froth does not appear in the glue, performing repeated salvaging of the froth, improving the purity of the glue, detecting the pH value inside the glue every 6 hours in the glue boiling process, adding baking soda for regulation when the pH value is lower than 7.2, adding white vinegar for regulation when the pH value is higher than 7.8, ensuring that the pH value in the glue boiling process is always between 7.2 and 7.8, regulating the acid of the glue, and facilitating the hydrolysis of collagen inside the donkey hide, boiling the glue with slow fire to be in a viscous state, adding a flavoring agent and a car odor agent into the glue, uniformly stirring, pouring the glue into a wood mold, and naturally drying in the cool and cool environment at normal temperature.
When soaking the donkey-hide, add flour in weak base aquatic, can adsorb donkey-hide surface part grease, get rid of the peculiar smell of donkey-hide, realize the preliminary purification of donkey-hide, utilize centrifuge centrifugation at clarification edulcoration in-process, the burlap filters, multiple edulcoration modes such as steel ice absorption are got rid of the inside impurity of glue, improve the purity of donkey-hide, guarantee the off-the-shelf quality of donkey-hide, and simultaneously, use burlap parcel steel ice to adsorb the froth at froth salvage in-process, the froth of high temperature carries out automatic shrink meeting microthermal steel ice rear surface, adhere to the surface at the burlap, can the at utmost reduce the waste of glue when getting rid of the inside impurity of glue.
Example three:
soaking fresh donkey skin in weak alkaline water with pH of 7.5 for 2.5 days, and mixing flour and weak alkaline water in a ratio of 1:10, flour is added to the proportion in weak alkaline water, and flour can adsorb partial grease and impurity on donkey hide surface, and it is once to change water every 6 hours in the soaking process, gets rid of donkey hair and impurity, boils 30 minutes with boiling water after wasing the donkey hide, cuts into the little square of 3 centimetres after the donkey hide softens for use, reduces the size of donkey hide, improves donkey hide system efficiency, pours the donkey hide of fritter into the pot, compares 1 according to donkey hide and clear water weight: 6, adding clear water, boiling the clear water to boil, then slowly boiling the water with slow fire, boiling donkey skin in boiling water at 110 ℃ for 72 hours, stirring the glue at intervals of 30 minutes in the glue boiling process, avoiding the glue from sticking to a pot in the boiling process, adding the clear water into the glue at intervals of 2.5 hours in the glue boiling process, wherein the weight ratio of the added clear water to the initial clear water is 1:10, preventing the water in the glue from evaporating too much to cause a pot drying, pouring the boiled glue into a centrifuge, utilizing the high-speed rotation of the centrifuge to make grease and sediment in the glue attach to a disc of the centrifuge, filtering the centrifuged glue by using linen, standing the filtered glue for 3 hours, making the grease which is not removed in the glue float on the upper layer of the glue, using steel ice to sweep the grease on the surface of the glue, making the grease attach to the surface of the steel ice after the grease is solidified, and further removing the grease in the glue, pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water according to a proportion, boiling the glue by using big fire, then boiling the glue by using small fire, absorbing the froth by using clean burlap wrapped steel ice when the froth floats above the glue, performing primary froth salvaging, adding 300 milliliters of spring water into the glue again, stirring by using a stirring rod, salvaging the froth again after the glue is boiled out of the froth again, circulating for 4 times until the froth does not appear in the glue, performing repeated salvaging of the froth, improving the purity of the glue, detecting the pH value inside the glue every 7 hours in the glue boiling process, adding saleratus for regulating and controlling when the pH value is lower than 7.2, adding white vinegar for regulating and controlling when the pH value is higher than 7.8, ensuring that the pH value in the glue boiling process is always between 7.2 and 7.8, regulating and controlling the acid of the glue, and facilitating the hydrolysis of collagen inside the donkey hide, boiling the glue with slow fire to be in a viscous state, adding a flavoring agent and a car odor agent into the glue, uniformly stirring, pouring the glue into a wood mold, and naturally drying in the cool and cool environment at normal temperature.
When soaking the donkey-hide, add flour in weak base aquatic, can adsorb donkey-hide surface part grease, get rid of the peculiar smell of donkey-hide, realize the preliminary purification of donkey-hide, utilize centrifuge centrifugation at clarification edulcoration in-process, the burlap filters, multiple edulcoration modes such as steel ice absorption are got rid of the inside impurity of glue, improve the purity of donkey-hide, guarantee the off-the-shelf quality of donkey-hide, and simultaneously, use burlap parcel steel ice to adsorb the froth at froth salvage in-process, the froth of high temperature carries out automatic shrink meeting microthermal steel ice rear surface, adhere to the surface at the burlap, can the at utmost reduce the waste of glue when getting rid of the inside impurity of glue.
Example four:
soaking fresh donkey skin in weak alkaline water with pH of 7.8 for 3 days, and mixing flour and weak alkaline water according to the weight ratio of 1:10, flour is added to the proportion in weak alkaline water, the flour can adsorb partial grease and impurity on donkey hide surface, it is once to change water every 8 hours to soak the in-process, get rid of donkey hair and impurity, boil 30 minutes with boiling water after wasing the donkey hide, the donkey hide softens the back and cuts into the little square of 3 centimetres for later use, reduce the size of donkey hide, improve donkey hide system efficiency, pour the donkey hide of fritter into the pot, compare 1 according to donkey hide and clear water weight: 6, adding clear water, boiling the clear water to boil, then slowly boiling the water with slow fire, boiling donkey skin in 100 ℃ boiling water for 80 hours, stirring the glue water every 30 minutes in the glue water boiling process, avoiding the glue water from sticking to a pot in the boiling process, adding the clear water into the glue water every 3 hours in the glue water boiling process, wherein the weight ratio of the added clear water to the initial clear water is 1:10, preventing the water in the glue water from evaporating too much to cause a dry pot, pouring the boiled glue water into a centrifugal machine, enabling the grease and sediment in the glue water to be attached to a disc of the centrifugal machine by utilizing the high-speed rotation of the centrifugal machine, filtering the centrifuged glue water by utilizing a linen, standing the filtered glue water for 2.5 hours, enabling the grease which is not removed in the glue water to float on the upper layer of the glue water, enabling the grease on the surface of the glue water to be swept by steel ice, enabling the grease to be attached to the surface of the steel ice after the grease is solidified, and further removing the grease in the glue water, pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water according to a proportion, boiling the glue by using big fire, then boiling the glue by using small fire, absorbing the froth by using clean burlap wrapped steel ice when the froth floats above the glue, performing primary froth salvaging, adding 200 ml of spring water into the glue again, stirring by using a stirring rod, salvaging the froth again after the glue is boiled out of the froth again, circulating for 3 times until the froth does not appear in the glue, performing repeated salvaging of the froth, improving the purity of the glue, detecting the pH value inside the glue every 8 hours in the glue boiling process, adding baking soda for regulation when the pH value is lower than 7.2, adding white vinegar for regulation when the pH value is higher than 7.8, ensuring that the pH value in the glue boiling process is always between 7.2 and 7.8, regulating the acid of the glue, and facilitating the hydrolysis of collagen inside the donkey hide, boiling the glue with slow fire to be in a viscous state, adding a flavoring agent and a car odor agent into the glue, uniformly stirring, pouring the glue into a wood mold, and naturally drying in the cool and cool environment at normal temperature.
When soaking the donkey-hide, add flour in weak base aquatic, can adsorb donkey-hide surface part grease, get rid of the peculiar smell of donkey-hide, realize the preliminary purification of donkey-hide, utilize centrifuge centrifugation at clarification edulcoration in-process, the burlap filters, multiple edulcoration modes such as steel ice absorption are got rid of the inside impurity of glue, improve the purity of donkey-hide, guarantee the off-the-shelf quality of donkey-hide, and simultaneously, use burlap parcel steel ice to adsorb the froth at froth salvage in-process, the froth of high temperature carries out automatic shrink meeting microthermal steel ice rear surface, adhere to the surface at the burlap, can the at utmost reduce the waste of glue when getting rid of the inside impurity of glue.
Soaking fresh donkey skin in weak alkaline water with the pH value of 7.3-7.8 for 2-3 days, changing water every 5-8 hours in the soaking process to remove donkey hair and impurities, cleaning the donkey skin, boiling the donkey skin for 20-30 minutes by using boiling water, cutting the donkey skin into small squares of 2-3 cm after softening the donkey skin for later use, and soaking the donkey skin according to the ratio of 1:10, flour is added into weak alkaline water according to the proportion, so that part of oil on the surface of donkey skin can be adsorbed, the peculiar smell of the donkey skin is removed, and the preliminary purification of the donkey-hide gelatin is realized; pouring the boiled glue into a centrifuge, attaching grease and sediment in the glue to a disc of the centrifuge by utilizing the high-speed rotation of the centrifuge, filtering the centrifuged glue by utilizing burlap, filtering donkey skin remained in the glue by utilizing coarse burlap, filtering the grease in the glue by utilizing fine burlap, cleaning the remained donkey skin, adding clear water again for boiling, standing the filtered glue for 2-3 hours to enable the grease which is not removed in the glue to float on the upper layer of the glue, using steel ice to sweep the grease on the surface of the glue to enable the grease to be attached to the surface of the steel ice after being solidified, removing impurities in the glue by utilizing various impurity removal modes such as centrifugation of the centrifuge, burlap filtration, steel ice adsorption and the like in the process of clarifying and impurity removal, improving the purity of the donkey-hide, ensuring the quality of a donkey-hide finished product, and recycling the filtered donkey skin, the waste of materials is reduced; pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5's proportion adds spring water, changes to use the small fire to boil after making the glue boiling with big fire earlier, when floating the foam in the glue top, uses clean burlap parcel steel ice to adsorb the floating foam, uses burlap parcel steel ice to adsorb the floating foam at floating foam salvage in-process, the floating foam of high temperature is meetting microthermal steel ice rear surface and is carried out automatic shrink, the surface at the burlap adheres to, reduce the waste of glue when getting rid of the inside impurity of glue that can the at utmost.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method for purifying crude gelatin in donkey-hide gelatin preparation is characterized by comprising the following steps: the method comprises the following steps:
s1) preparing crude rubber: soaking fresh donkey skin in weak alkaline water with pH of 7.3-7.8 for 2-3 days, changing water every 5-8 hr during soaking to remove donkey hair and impurities, cleaning donkey skin, decocting with boiling water for 20-30 min, softening donkey skin, and cutting into 2-3 cm small blocks;
s2) boiling glue: pouring small donkey skin into a pot, and mixing the donkey skin and clear water according to the weight ratio of 1: adding clear water according to the proportion of 6, boiling the clear water, then slowly decocting the clear water with soft fire, and decocting the donkey skin in boiling water of 100-;
s3) clarifying and impurity removing: pouring the boiled glue into a centrifuge, attaching grease and sediment inside the glue to a disc of the centrifuge by utilizing the high-speed rotation of the centrifuge, filtering the centrifuged glue by utilizing linen, standing the filtered glue for 2-3 hours to enable the grease which is not removed in the glue to float on the upper layer of the glue, and using steel ice to sweep the grease on the surface of the glue to enable the grease to be attached to the surface of the steel ice after being solidified;
s4) foaming and purifying: pouring the prepared glue into a clean pot, and mixing the glue and the mountain spring water according to the weight ratio of 1: 5, adding spring water, boiling the glue by using a big fire, then slowly boiling the glue by using a small fire, and wrapping steel ice by using clean burlap to adsorb floating foam when the floating foam floats above the glue;
s5) glue discharging: boiling the glue with slow fire to be in a viscous state, adding a flavoring agent and a car odor agent into the glue, uniformly stirring, pouring the glue into a wood mold, and naturally drying in the cool and cool environment at normal temperature.
2. The method for purifying crude gelatin in the preparation of donkey-hide gelatin according to claim 1, wherein the method comprises the following steps: when donkey skin is soaked in the crude gelatin preparation process, the weight ratio of flour to weak base water is 1:10 to the flour in weak alkaline water.
3. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: and stirring the glue water every 20-30 minutes in the boiling process of the glue water.
4. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: clear water is added into the glue every 2-3 hours in the boiling process of the glue, and the weight ratio of the added clear water to the initial clear water is 1: 10.
5. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: the pH value of the inside of the glue is required to be detected every 5-8 hours in the glue boiling process, sodium bicarbonate is required to be added for regulation and control when the pH value is lower than 7.2, and white vinegar is required to be added for regulation and control when the pH value is higher than 7.8, so that the pH value of the glue is ensured to be between 7.2 and 7.8 all the time in the glue boiling process.
6. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: during the clarification edulcoration, use coarse linen earlier to filter the donkey hide remaining in the glue, use thin linen to filter the inside grease of glue again.
7. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 6, wherein the method comprises the following steps: and filtering during clarification and impurity removal to obtain residual donkey skin, cleaning, and adding clear water again for decocting.
8. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: and during foam beating purification, after primary foam floating fishing is finished, adding 500 ml of mountain spring water into the glue again, stirring by using a stirring rod, boiling the foam out of the glue again, and then fishing the foam again, circulating for 3-5 times until no foam floating appears in the glue.
9. The method for purifying crude gelatin in donkey-hide gelatin preparation according to claim 1, wherein the method comprises the following steps: before the glue solution is poured into the mould, the weight ratio of the soybean oil to the glue solution 1: soybean oil was added to the inside of the gum solution at a weight ratio of 100.
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