CN103168927B - Granular tryptophan premix and preparation method thereof - Google Patents
Granular tryptophan premix and preparation method thereof Download PDFInfo
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- CN103168927B CN103168927B CN201310112012.9A CN201310112012A CN103168927B CN 103168927 B CN103168927 B CN 103168927B CN 201310112012 A CN201310112012 A CN 201310112012A CN 103168927 B CN103168927 B CN 103168927B
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Abstract
The invention relates to a granular tryptophan premix. The granular tryptophan premix contains tryptophan and calcium carbonate, the moisture content is 2-4%, the grain density is 0.56-0.75 g/cm<3>, the grain size is 20-60 meshes, and the pH value is 6-8. When the granular tryptophan premix disclosed by the invention is mixed with other feed materials, a delamination phenomenon is uneasy to occur; the influence caused by the outside is small, and the quality guarantee period is longer and can reach 2-2.5 years, and due to an appropriate water content, the livestock chewing water gap is good; and the premix has a good scattering property, and does not produce a compaction situation in the process of storage.
Description
The present invention is divisional application, and original bill application number is 201010596283.2, and the original bill applying date is on December 20th, 2010, and original bill name is called: particle tryptophan premix and preparation method thereof.
Technical field
The present invention relates to a kind of tryptophan premix, particularly a kind of particle tryptophan premix and preparation method thereof, belongs to field of feed.
Background technology
Pre-mixing agent is the abbreviation of additive premix, and it is by one or more microcomponents and carrier or diluent proportioning on request, the osculant compound feed products made after Homogeneous phase mixing.Microcomponent comprises the additives such as various trace quantity mineral substance element, various vitamin, synthesizing amino acid.Carrier is the particulate that can carry or adsorb trace active adding ingredient.
Amino acid has two type one essential amino acid and nonessential amino acid.Eight kinds of essential amino acids are isoleucines, lysine, leucine, methionine, phenylalanine, valine, threonine and tryptophan.It is not because they are more important that these amino acid are called as required reason, but organism itself can not produce.Therefore, these amino acid must pass through daily feed and are supplemented.Nonessential amino acid is the amino acid that some organisms can oneself produce, so not necessarily have to be included in food.
Tryptophan is a kind of essential amino acid.In all amino acid, it is minimum that tryptophan is considered to content in food.Although rare, tryptophan plays a very important role in adjustment animal appetite, maintenance body health etc.
The granularity of the tryptophan premix on existing market is generally 100-200 order, and when this tryptophan premix is produced, dust is too large, easily makes direct labor's allergy, produces harmful effect to direct labor's health, be difficult to realize cleanly production; In addition, tryptophan premix moisture resistance is low, the shelf-life is shorter, is 6-8 month, and when powdery tryptophan premix is added in feed, because powdery pre-mixing agent proportion differs comparatively large with the proportion of other materials in feed, easy layering during mixing, causes result of use poor.
Summary of the invention
An object of the present invention is to provide a kind ofly adds that not easily layering in feed, moisture resistance are good, long shelf-life, particle tryptophan premix easy to use to.
Above-mentioned technical purpose of the present invention is achieved by the following technical programs:
A kind of particle tryptophan premix, containing tryptophan and calcium carbonate, and tryptophane is 20-25wt%, and moisture is 2-4%, and grain density is 0.56-0.75g/cm
3, particle size is 20-60 order, and pH value is 6-8.
In a certain proportion of tryptophan premix, add calcium carbonate, can increase the calcium content in pre-mixing agent, this tryptophan premix adds to after in feed, can regulate nutrition-allocated proportion wherein.When particle tryptophan premix adds in feed as feed addictive, its tryptophane and moisture make its density value close to other materials in feed as corn, barley, Chinese sorghum isodensity, its granularity is suitable simultaneously, this ensure that it not easily occurs layering after mixing with other materials, only have one deck above when preventing some livestock and poultry from eating food and cause nutrition uneven; Further, the pH value of particle tryptophan premix and moisture make particle tryptophan premix be subject to ectocine little, and the shelf-life is longer, can reach 2-2.5.If moisture is less than 2%, not only moisture resistance is poor, and affects the density of product, and being greater than 4% affects the shelf-life, and meanwhile, it is good that suitable moisture can make livestock and poultry chew the mouth of a river.In addition, the density of particle tryptophan premix of the present invention and particle size make this pre-mixing agent have good free flowability, also can not produce compacting, conglomeration situation when depositing.
One as technical solution of the present invention is preferred, and described particle tryptophan premix comprises kernel and integument, and described integument successively wraps up, and the number of plies is 3-200 layer.Comprise the easy Control granularity of granular premixing agent of multilayer, and intensity is high, not easily broken, can be evenly distributed in feed, not easily layering.
One as technical solution of the present invention is preferred, and described grain density is 0.58-0.66g/cm
3.
One as technical solution of the present invention is preferred, and described granules Particle Size is 30-50 order, and pH value is 7-7.5.
Another object of the present invention is to provide a kind of preparation method that can realize the described particle tryptophan premix of cleanly production, comprises the following steps:
(1) ferment: cultivate in thalline liquid medium within and obtain ripe seed, ripe seed moves into fermentation in the culture medium of fermentation tank again and produces tryptophan zymotic fluid;
(2) separation is concentrated: tryptophan zymotic fluid is concentrated obtains underflow, and in underflow, solid content is 30-35%, and tryptophane is the 8-15wt% of underflow total amount;
(3) mix: in underflow, add the calcium carbonate accounting for underflow total amount 15-20wt% while stirring, obtain mixed liquor;
(4) slurry-spraying pelletizing: mixed liquor is formed spraying, upwards spray includes the hot gas of calcium carbonate simultaneously, forms primary granule;
(5) multistage parcel: the plume contact that mixed liquor is formed also is wrapped up described primary granule formation secondary granule, repeats this step and finally obtains ultimate particle.
Calcium carbonate is the good carrier of tryptophan when mixing with underflow, serves as again nucleus and mixed liquor and sprays and form primary granule, but also add the calcium content in final products in slurry-spraying pelletizing.When calcium carbonate mixes with underflow, if calcium carbonate is not enough, some tryptophan can not using calcium carbonate as carrier, mixing mixed liquor uneven components out; If calcium carbonate is too much, then most tryptophan can adsorb by the calcium carbonate be positioned at above, causes tryptophane to be above greater than tryptophane below.Add the calcium carbonate of 15-20wt% during mixing, form uniform mixed liquor.
After during slurry-spraying pelletizing, primary granule is formed, mixed liquor spraying is repeatedly wrapped up primary granule again and is formed ultimate particle, and during production, dust is little, can realize cleanly production.Solve prior art pre-mixing agent and be pulverous shortcoming, achieve pre-mixing agent granulating and shaping fast, production efficiency is high, ensure that the tryptophan of pre-mixing agent particle is evenly distributed simultaneously.
One as technical solution of the present invention is preferred, and described step (2) method for concentration is evaporation and concentration.
One as technical solution of the present invention is preferred, and in described step (3), the granularity of calcium carbonate is 80-120 order.In this step, calcium carbonate mainly serves as carrier, and the calcium carbonate of described particle size range contributes to carrying absorption tryptophan.
One as technical solution of the present invention is preferred, and in described step (4), the temperature of hot gas is 120-140 DEG C.
One as technical solution of the present invention is preferred, and in described step (4), calcium carbonate is spherical, and granularity is 60-80 order.Calcium carbonate mainly contains cube, needle-like and spherical three kinds of crystalline forms, the preferred spherical calcium carbonate of the present invention, is convenient to form spherical primary granule.In this step, calcium carbonate mainly serves as nucleus, therefore selects the calcium carbonate that relative step (3) granularity is larger, is convenient to the primary granule forming suitable size.If nucleus granularity is excessive, then primary granule is large, and the tryptophane on ultimate particle can be lower, do not reach nutritional requirement.Further, the Carbonate Particle Size serving as nucleus should control among a small circle, and particle size range is little, then epigranular, and the ultimate grain graininess of formation is also comparatively even, and inventor studies discovery, and the feed preblending agent of uniform particle size can improve livestock and poultry body weight gains and feed conversion rate.
More preferably, the Carbonate Particle Size in described step (4) is 70 orders.
In sum, the present invention has following beneficial effect:
1. the tryptophane in particle tryptophan premix of the present invention and moisture make its density value close to other materials of feed as corn, barley, Chinese sorghum isodensity, not easily there is layering after when mixing with other materials, only have one deck above when preventing some livestock and poultry from eating food and cause nutrition uneven; Further, the pH value of particle tryptophan premix and moisture make particle tryptophan premix be subject to ectocine little, and the shelf-life is longer, can reach 2-2.5, and meanwhile, it is good that suitable moisture makes livestock and poultry chew the mouth of a river; The density of particle tryptophan premix of the present invention and particle size make this pre-mixing agent have good free flowability, also can not produce compacting, conglomeration situation when depositing.
2. particle tryptophan premix production process dust of the present invention is low, can realize cleaner production.
Detailed description of the invention
Embodiment one
Nutrient solution containing sugar, inorganic salts is after sterilizing, inoculation Escherichia coli fermentation, mend sugar during the fermentation, mend ammonia, tryptophan zymotic fluid is produced after fermentation, then evaporation and concentration, detects with high performance liquid chromatograph simultaneously, stops evaporation when underflow solid content is 33%, tryptophane is the 12wt% of underflow total amount, add in underflow while stirring and account for underflow total amount 18wt%, 90 object calcium carbonate, obtain mixed liquor; Mixed liquor is formed spraying by compressed air atomization, upwards sprays the hot gas including 130 DEG C of 70 object spherical calcium carbonate particles simultaneously and forms primary granule; Mixed liquor is sprayed in granulation chamber to continue to contact and wrap up described primary granule and forms secondary granule, particle is motion capable of circulation in granulation chamber, therefore repeatedly can repeat this parcel step and finally obtain ultimate particle, the number of plies of parcel was determined by the production time, production time is 3h, finally obtains ultimate particle.Moist ultimate particle first carries out predrying, carries out depth drying, finally form dried particles after forming half-dried particle, discharges.
After testing, the tryptophane in final products particle tryptophan premix is 23wt%, and moisture is 3%, and grain density is 0.66g/cm
3, particle size is 30 orders, and pH value is 8.
Mixing layering test: particle tryptophan premix product 100g is mixed with 1.9kg feed base daily ration, load cloth bag, cloth bag is placed on vibrating device internal vibration 10min, get upper strata respectively, the 20g material of middle level and bottom detects, the particle tryptophan premix content on upper strata is 4.92%, the particle tryptophan premix content in middle level is 5.02%, and the particle tryptophan premix content of bottom is 5.03%.Compound is even, substantially without lamination.
Dust test adopts filter membrane dust measuring method.Dust measuring principle extracts with dust sampler the dust laden air gathering certain volume, and when dust laden air is by filter membrane, dust is trapped on filter membrane, and the weightening finish according to filter membrane calculates dust concentration.
Adopt dust sampler to detect dust concentration in production scene, within every 10 minutes, detect once, detect 5 times, average, dust concentration is 0.8mg/m
3.
Mixing delamination test, dust test and shelf-life experimental result are in table 1.
Comparing embodiment one
On existing market, 100 object tryptophan premix workshop mean dust concentrations are 15mg/m
3, exceed 10mg/m in workshop
3dust maximum permissible concentration.
The identical method of embodiment one is adopted to do mixing layering test, get upper strata respectively, the 20g material of middle level and bottom detects, the particle tryptophan premix content on upper strata is 0.8%, the particle tryptophan premix content in middle level is 1.5%, the particle tryptophan premix content of bottom is 16%, and mixing lamination is obvious.
Experimental result is in table 1.
Embodiment two
Nutrient solution containing sugar, inorganic salts is after sterilizing, inoculation Escherichia coli fermentation, mend sugar during the fermentation, mend ammonia, tryptophan zymotic fluid is produced after fermentation, then adopt filtration method Separation of Solid and Liquid, detect with high performance liquid chromatograph simultaneously, when underflow solid content is 30%, tryptophane is the 15wt% of underflow total amount, stop evaporation, add in underflow while stirring and account for underflow total amount 20wt%, 80 object calcium carbonate, obtain mixed liquor; Mixed liquor is formed spraying, and upwards spray the hot gas of 140 DEG C, comprising particle size in hot gas is the cube shaped calcium carbonate of 80 object, and ensuing prilling is with embodiment one, and the production time is 1.8h simultaneously.
After testing, the tryptophane in final products particle tryptophan premix is 21wt%, and moisture is 2%, and grain density is 0.62g/cm
3, particle size is 60 orders, and pH value is 7.
Get upper strata respectively, the 20g material of middle level and bottom detects, the particle tryptophan premix content on upper strata is 4.88%, and the particle tryptophan premix content in middle level is 5%, and the particle tryptophan premix content of bottom is 5.06%.Compound is even, substantially without lamination.
Mixing delamination test, dust test and shelf-life experimental result are in table 1.
Comparing embodiment two
On existing market, 200 object tryptophan premix workshop mean dust concentrations are 18mg/m
3.
Adopt the method that embodiment one is identical to do mixing layering test, leave standstill and find that compound has lamination after 3 minutes.
Mixing delamination test, dust test and shelf-life experimental result are in table 1.
Get upper strata, the material of middle level and bottom detects respectively, the particle tryptophan premix content on upper strata is 0.4%, and the particle tryptophan premix content in middle level is 3.5%, and the particle tryptophan premix content of bottom is 20%, and mixing lamination is obvious.
Embodiment three
Nutrient solution containing sugar, inorganic salts is after sterilizing, inoculation Escherichia coli fermentation, mend sugar during the fermentation, mend ammonia, tryptophan zymotic fluid is produced after fermentation, then evaporation and concentration, detects with high performance liquid chromatograph simultaneously, stops evaporation when underflow solid content is 35%, tryptophane is the 8wt% of underflow total amount, add in underflow while stirring and account for underflow total amount 15wt%, 120 object calcium carbonate, obtain mixed liquor; Mixed liquor is formed spraying, and upwards spray the hot gas of 120 DEG C, comprising particle size in hot gas is 60 object aciculiform calcium carbonate, and ensuing prilling is with embodiment one, and the production time is 3.6h simultaneously.
After testing, the tryptophane in final products particle tryptophan premix is 25wt%, and moisture is 2.6%, and grain density is 0.75g/cm
3, particle size is 20 orders, and pH value is 6.5.
Get upper strata respectively, the 20g material of middle level and bottom detects, the particle tryptophan premix content on upper strata is 4.89%, and the particle tryptophan premix content in middle level is 4.99%, and the particle tryptophan premix content of bottom is 5.01%.Compound is even, substantially without lamination.
Mixing delamination test, dust test and shelf-life experimental result are in table 1.
Embodiment four
Nutrient solution containing sugar, inorganic salts is after sterilizing, inoculation Escherichia coli fermentation, mend sugar during the fermentation, mend ammonia, tryptophan zymotic fluid is produced after fermentation, then evaporation and concentration, detects with high performance liquid chromatograph simultaneously, stops evaporation when underflow solid content is 32%, tryptophane is the 9.5wt% of underflow total amount, add in underflow while stirring and account for underflow total amount 16wt%, 110 object calcium carbonate, obtain mixed liquor; Mixed liquor is formed spraying, and upwards spray the hot gas of 128 DEG C, comprising particle size in hot gas is 65 object spherical calcium carbonates, and ensuing prilling is with embodiment one, and the production time is 2.1h simultaneously.
After testing, the tryptophane in final products particle tryptophan premix is 20wt%, and moisture is 3.1%, and grain density is 0.58g/cm
3, particle size is 40 orders, and pH value is 7.5.
Get upper strata respectively, the 20g material of middle level and bottom detects, the particle tryptophan premix content on upper strata is 4.99%, and the particle tryptophan premix content in middle level is 5%, and the particle tryptophan premix content of bottom is 5.02%.Compound is even, substantially without lamination.
Mixing delamination test, dust test and shelf-life experimental result are in table 1.
The different tryptophan premix Performance comparision of table 1
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this description, as long as but be all subject to the protection of Patent Law in right of the present invention.
Claims (10)
1. a particle tryptophan premix, containing tryptophan and calcium carbonate, is characterized in that: tryptophane is 20-25wt%, and moisture is 2-4%, and grain density is 0.56-0.75g/cm
3, particle size is 20-60 order, and pH value is 6-8;
Wherein, when calcium carbonate mixes with underflow, its addition is 15-20wt%, and described underflow is tryptophan zymotic fluid.
2. particle tryptophan premix according to claim 1, is characterized in that: described particle tryptophan premix comprises kernel and integument, and described integument successively wraps up, and the number of plies is 3-200 layer.
3. pre-mixing agent according to claim 2, is characterized in that: calcium carbonate is the carrier of tryptophan when mixing with underflow; In slurry-spraying pelletizing, serve as nucleus and mixed liquor spray and form primary granule.
4. pre-mixing agent according to claim 3, is characterized in that: calcium carbonate is mixed liquor uniform composition when mixing with underflow.
5. pre-mixing agent according to claim 3, is characterized in that: after during slurry-spraying pelletizing, primary granule is formed, and mixed liquor spraying is repeatedly wrapped up primary granule again and formed ultimate particle.
6. pre-mixing agent according to claim 3, is characterized in that: calcium carbonate is spherical.
7. a preparation method for tryptophan premix, is characterized in that the method comprises the following steps:
(1) ferment: cultivate in thalline liquid medium within and obtain ripe seed, ripe seed moves into fermentation in the culture medium of fermentation tank again and produces tryptophan zymotic fluid;
(2) separation is concentrated: tryptophan zymotic fluid is concentrated obtains underflow, and in underflow, solid content is 30-35%, and tryptophane is the 8-15wt% of underflow total amount;
(3) mix: add in underflow while stirring and account for underflow total amount 15-20wt% calcium carbonate, obtain mixed liquor;
(4) slurry-spraying pelletizing: mixed liquor is formed spraying, upwards spray includes the hot gas of calcium carbonate simultaneously, forms primary granule;
(5) multistage parcel: the plume contact that mixed liquor is formed also is wrapped up described primary granule formation secondary granule, repeats this step and finally obtains ultimate particle.
8. method according to claim 7, described step (2) method for concentration is evaporation and concentration.
9. method according to claim 7, comprises the following steps: in described step (3), the granularity of calcium carbonate is 80-120 order.
10. method according to claim 7, comprises the following steps: in described step (4), the temperature of hot gas is 120-140 DEG C.
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