CN1264967C - Industrial use of marine fungus fission chytrid OUC88 - Google Patents
Industrial use of marine fungus fission chytrid OUC88 Download PDFInfo
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Abstract
The present invention relates to the industrial use of a marine fission chytrid OUC88. The fission chytrid has the capacity for the abundant production of docosahexenoic acid (DHA), the preservation number of the fission chytrid strain is CGMCC No. 1240, and the preservation date is October 27th, 2004; the fission chytrid is a new strain obtained by the combination of the chemical mutagenesis and the physical mutagenesis of a fission chytrid SR21 strain as an original strain; by optimizing the culture condition of strains and replenishing carbon sources in the later period of culture, the dry cell weight of the mutant strain OUC88 with high DHA content can be as high as 25 g/L, and the DHA yield can reach 8.27 g/L. The fission chytrid can promote physical development when used as an additive of bread and other foods, or dairy products, particularly infant milk powders; the whole fermentation technology of the fission chytrid, which has the advantages of simplicity and no need of increase in addition,al equipment and manual work, improves the utilization rate of organisms, realizes the obtainment of target products with high yield, and reduces fermentation cost.
Description
Technical field
The present invention relates to the improvement of marine microorganism utilisation technology, specifically is a kind of industrial application of marine fungus fission chytrid OUC 88.It belongs to technical field of microbe application.
Background technology
In recent years, (Polyunsaturated fatty acids, PUFAs) vital role to human health more and more is subject to people's attention polyunsaturated fatty acid.Wherein, as two dodecahexaenes of one of important ω-3PUFAs (hereinafter to be referred as: DHA) [docosahexaenoic acid (22:6, n-3)] because of its in human body and extremely people's the favor of the intravital important physiological function of animal.Studies show that DHA is the basal component of cytolemma in some tissue of human body; Baby's vision system and neural growth are played an important role; Also have pharmacological actions such as reducing cholesterol, anticoagulation, preventing cancer; In addition, DHA still is the fry required a kind of indispensable fatty acid that grows, and can improve the surviving rate of fry and reduce its albinism.DHA obtains from fish oil traditionally, but the PUFAs that extracts from fish oil exists the output shakiness, yield is low, cost is high and contain other problems such as ω-6PUFAs, and along with the growing tension of fishing resources, traditional DHA resource can't satisfy the growing market requirement.Therefore, the newborn resource of exploitation DHA has become new research focus.
Schizochytrium limacinum (Schizochytrium limacinum) is a kind of thalassiomycetes, and it belongs to, and egg capsule Gammaproteobacteria in the fungi, Saprolegniales, crisp mould chytrid section, schizochytrium limacinum belong to, the limacinum kind.DHA content is abundant in this bacterium, also contain a spot of DPA, and other unsaturated fatty acid content is very low.This bacterium is safe in utilization, and it has carried out a series of security detection to white mouse, rabbit humans such as Hammond, does not find any toxic side effect (Hammond, 2001).Therefore, be the latent production-goods source of a kind of good DHA.At present, less to the research of this bacterium in the world.T.Yokocki etc. adopt several kinds of carbon source and nitrogenous source that schizochytrium limacinum (Schizochytrium limacinum) SR21 is optimized cultivation in shaking bottle, and the DHA production peak that obtains is 4g/L.People such as Kw Fan are that carbon, nitrogenous source are cultivated schizochytrium limacinum mangrovei with glucose and yeast extract, and the output of DHA only is 2.79g/L.The output of DHA is not very high in more than cultivating, and this also has direct relation except outside the Pass having with selected bacterial strain with culture process.Therefore, the culture process that how to select better schizochytrium limacinum strain and how to optimize this bacterium output that improves DHA with a nearly step is a problem that is worth research.
Summary of the invention
Goal of the invention of the present invention is the defective at prior art: the problem that DHA yields poorly in the screening and culturing of this bacterium, intend by induced mutations, selecting the higher schizochytrium limacinum new variety of DHA content from the former bacterial classification; And each factor that influences schizochytrium limacinum growth and the growth characteristic of this bacterium studied, on the basis of traditional culture process, further improve, set up the culture process of the schizochytrium limacinum of simple, the high DHA content of a cover preparation technology, the industrial application of exploitation schizochytrium limacinum new variety.
Task of the present invention is realized by following technical scheme, has developed the industrial application of a kind of ocean schizochytrium limacinum (Schizochytrium limacinum) OUC88.This schizochytrium limacinum have rich produce docosahexenoic acid (hereinafter to be referred as ability DHA), its culture presevation number: CGMCC No.1240, preservation date: 2004.10.27.
The mutafacient system of described ocean schizochytrium limacinum (Schizochytrium limacinum) OUC88, its bacterial strain is to preserve with its bacterial classification of schizochytrium limacinum (Schizochytrium limacinum) SR21 number to be: the bacterial strain of IFO 32693 is the bacterial classification that sets out, the novel bacterial that combines and obtain by chemomorphosis and physical mutagenesis.The mutagenesis step of novel bacterial is as follows:
(1) the single bacterium colony of picking schizochytrium limacinum SR21 is in liquid nutrient medium, 18---and under 30 ℃ of conditions, 100---250rpm shaking culture 1---are after 3 days;
(2) down add 0.05 in aseptic condition---the ethylmethane sulfonate (EMS) of 0.1mol/mL, and to make its final concentration be 0.05---and 0.1mol/L, constantly shake and handle 10---50 minutes;
(3) after centrifugal (2) go on foot nutrient solution and wash thalline, centrifuge washing bacterium liquid is made the OD of bacterium liquid
650After reaching 0.3---0.8, change culture dish over to, make this centrifuge washing bacterium liquid become thickness to be: 1---the thin layer bacterium liquid of 5mm;
(4) again with the thin layer bacterium liquid in (3) step 10---under the ultraviolet lamp of 30W 30---distance of 40cm, through ultraviolet light (UV) irradiation mutagenesis 10---60 seconds;
(5) with the thin layer bacterium liquid of mutagenesis centrifugal after, make the mycetocyte suspension of liquid nutrient medium, coat the solid medium flat board again, and---under 30 ℃ of conditions, cultivated 1---3 days in dark place 18, cultivate and grow single bacterium colony;
(6) calculate bacterial strain mutagenesis lethality rate under the different time condition, determine that lethality rate is 80%---90% 40 seconds bacterial strain of mutation time, its single bacterium colony of picking carries out mutagenesis to this bacterium again, and mutagenic condition is with above-mentioned (2), (3), (4) and (5); After carrying out the strain culturing of mutagenesis again, single bacterium colony of growing of picking again inserts respectively and contains 10---triangle of 50ml liquid nutrient medium shakes in the bottle culture condition: 18---under 30 ℃ of conditions, 100---250rpm shaking culture 2---5 days;
(7) be index with the dry cell weight, carry out first round screening: the high single bacterium colony of dry cell weight that filters out the 10-20 bacterial strain;
(8) be index with DHA output then, carry out second and take turns screening, BF routinely
3-methyl alcohol method is directly carried out esterification, by the percentage composition of DHA in the gas chromatography determination thalline, determines the bacterial strain that DHA output is high then, filters out the schizochytrium limacinum bacterial strain of the output of 3 strain DHA up to 8g/L at last, respectively called after OUC7, OUC23, OUC88.
The optimization strain culturing condition of described bacterial strain OUC88 bacterial strain is with 1---10% inoculum size inserts pre-incubated seed liquor; At the cultivation initial stage of this bacterium, adopt carbon, nitrogen concentration all 60---the substratum of 30g/L; In the middle and later periods of cultivating, promptly 3-4 days begin to add carbon source, improve carbon-nitrogen ratio C/N ≮ 2; Under 18---30 ℃ of condition, the vibration rotating speed is 100---250rpm on the airbath vibrator, shaking culture---7 days; Centrifugal collection thalline after the lyophilize, is surveyed the content of DHA in somatic cells dry weight and the mensuration thalline.
Described substratum is to be carbon source with glucose or glycerine or fructose, is nitrogenous source with yeast extract or peptone, joins in the mixed solution of natural sea-water and distilled water, and wherein seawater accounts for 20% of substratum---80%; Wherein carbon source concentration is 10---80g/L, nitrogen concentration are 6---40g/L, the preparation substratum the pH value 4---8.
Described ocean schizochytrium limacinum (Schizochytrium limacinum) OUC88; its somatic cells; contain 45 with it---total fat of 80%; wherein unsaturated fatty acids reaches 23 based on the content of DHA---and 44%; also contain 7---11% DPA; L-glutamic acid and aspartic acid high level; contain 0.4---1% taurine; other contains the performance of omega-3 polyunsaturated fatty acids (EPA)≤1% as food; beverage, the application of the additive of milk-product and infant formula thereof and feed and fodder additives.
The invention has the advantages that: from the former bacterial classification, by the secondary induced mutations, two take turns screening brings out the higher schizochytrium limacinum new variety of DHA content.The thalline of bacterial strain OUC88 of the present invention with ordinary method the total fat in this bacterium, protein content, amino acid is formed and ash content is analyzed: total fat of finding to have in its cell 45-80%, wherein unsaturated fatty acids is based on DHA, the content of DHA in total fat reaches 23-44%, also contains the DPA of the 7-11% that has an appointment in addition.And another kind of omega-3 polyunsaturated fatty acids EPA content in this bacterium is very low, and less than 1%, this uses very favourable for the exploitation schizochytrium limacinum as the wholesome food at the flour additive agent of making food, milk-product and baby milk thereof.Because studies show that, excessive EPA is unfavorable for infant's growth.Protein content is about 8-12% in the thalline, and wherein, L-glutamic acid and aspartate content are higher.Analyze also and find, contain the taurine of the 0.4--1% that has an appointment in this bacterium, reported first is in domestic and foreign literature.Schizochytrium limacinum of the present invention has higher researching value.Its dry weight biomass of schizochytrium limacinum of the present invention is brought up to 14--25g/L by original 12--22g/L, and the percentage composition of DHA is then brought up to present 18-35% by original 13-26% in the thalline.The output of the DHA that obtains like this is not less than 3.6g/L, reaches as high as 8g/L, has surpassed the production peak of the 4g/L that is reported in the present document, has reached the cellular biomass of expection and the effect that DHA content all increases.People such as Fan KW are that carbon source and nitrogenous source are cultivated according to a conventional method with glucose and yeast extract respectively to the research of schizochytrium limacinum mangrovei, and the production peak of the DHA that obtains is .2.78g/L (Fan KW et al, 2001); People such as T.Nakahara are carbon source with glucose, with corn steep liquor and (NH
4)
2SO
4For carrying out routine respectively to schizochytrium limacinum sp.strain SR21 in shaking bottle and reactor, cultivates in nitrogenous source, find that the growing state of this microorganism in reactor is better than shaking bottle, production peak in reactor is the dry cell weight of 21g/L and the DHA of 4.7g/L (T.Nakahara et al, 1996); 1997, people such as T.Yaguchi cultivated schizochytrium limacinum sp.strain SR21 in reactor according to a conventional method, were carbon source with glucose, with corn steep liquor and (NH
4)
2SO
4Being nitrogenous source, is under the 300rpm condition at the shaking culture rotating speed, improves the concentration to 12% of glucose, has obtained the DHA output (T.Yaguchi, 1997) of dry cell weight and the 13.3g/L of 48.1g/L; And people such as T.Yoloehi were research object with the schizochytrium limacinum sp.strainSR21 of people such as T.Yaguchi research in 1997 still in 1998, (this moment this bacterium named SR21), adopt several kinds of carbon source, nitrogenous source to comprise that T.Yaguchi in 1997 adopts exhausted glucose (carbon source) and corn steep liquor, (NH respectively for schizochytrium limacinum limacinum
4)
2SO
4(the two is a nitrogenous source) is optimized cultivation according to a conventional method in shaking bottle, the best result that obtains has only the DHA output (T.Yolochi, 1998) of 4g/L.And the present invention is by carrying out induced mutations to schizochytrium limacinum limacinum SR21, filter out the mutant strain OUC88 of high DHA content, equally also in shaking bottle, bacterial strain OUC88 is cultivated, add this operation of carbon source by the later stage again, make dry cell weight up to 25g/L, DHA output reaches 8.27g/L; And whole culture process is simple, need not increase extra equipment and artificial, only by lower additional input, has improved biological utilization ratio, has reduced fermentation costs, has improved economic benefit.Whole culture process of the present invention is simple to operate, does not increase extra equipment and artificial, only by lower additional input, has improved bioavailability, has obtained the purpose product of high yield, has reduced fermentation costs.
Accompanying drawing and embodiment thereof
Embodiments of the invention further specify as follows in conjunction with the accompanying drawings:
Fig. 1 is different times phase of the present invention schizochytrium limacinum OUC88 upgrowth situation figure.
Fig. 2 is a different times phase of the present invention schizochytrium limacinum OUC88DHA accumulation condition diagram.
Referring to Fig. 1, a kind of thalassiomycetes schizochytrium limacinum (Schizochytrium limacinum) OUC88 and the industrial application thereof of Fig. 2 the present invention development.This bacterial classification has rich ability of producing docosahexenoic acid, its culture presevation number: CGMCCNo.1240, preservation date: 2004.10.27.
Described schizochytrium limacinum (Schizochytrium limacinum) OUC88 bacterial strain is with schizochytrium limacinum (Schizochytrium limacinum) SR21 bacterial classification, its bacterial classification is preserved and number is: the bacterial strain of IFO 32693 is the bacterial classification that sets out, the novel bacterial that obtains by induced mutations; Its mutagenesis step is as follows:
Embodiment 1: the mutagenic and breeding of schizochytrium limacinum:
The single bacterium colony of picking schizochytrium limacinum SR21, shake in the bottle in the triangle that contains 50ml liquid nutrient medium (glucose 30g/l, yeast extract 10g/l, 50% natural sea-water), under 25 ℃ of conditions, after the 180rpm shaking culture 2 days, the ethylmethane sulfonate (EMS) that adds 0.05mol/mL in aseptic condition down, making its final concentration is 0.08mol/L, constantly shake and handled 30 minutes, centrifugal going up goes on foot nutrient solution and washs thalline under the aseptic condition, promptly, centrifuge washing bacterium liquid is made the OD of bacterium liquid with after the sterilized water washing 5 times
650After reaching 0.3---0.8, change culture dish over to, make this centrifuge washing bacterium liquid become thickness to be: 1---the thin layer bacterium liquid of 5mm; The distance mutagenesis 0 (contrast) of 30cm under the ultraviolet lamp of 20W again, 10,20,30,40,50,60 seconds, again thalline is suspended in the 1ml liquid nutrient medium after centrifugal, applying solid flat board then, cultivated 2 days the dark place under 25 ℃ of conditions, grow single bacterium colony, calculate the lethality rate (seeing Table 1) under the different condition.
Table 1: the lethality rate of schizochytrium limacinum SR21 under the different mutation time:
| Mutation time (second) | The colony number that grows (individual) | Lethality rate (%) |
| 0 | 2308 | -- |
| 10 | 1812 | 21.49 |
| 20 | 840 | 63.60 |
| 30 | 746 | 67.68 |
| 40 | 232 | 89.95 |
| 50 | 154 | 93.33 |
| 60 | 68 | 97.05 |
Determine that according to table 1 lethality rate is 80%---90% 40 seconds bacterial strain of mutation time, picking list bacterium colony carries out mutagenesis to this bacterium again, and mutation time is 40 seconds, and other mutagenic condition is the same.The single bacterium colony that grows after the picking mutagenesis at random shook in the bottle under 25 ℃ of conditions the 180rpm shaking culture 5 days respectively at the triangle that contains the 50ml liquid nutrient medium, and centrifugal collection thalline after-50 ℃ of lyophilizes, is surveyed its dry weight.With the dry weight is that index is carried out the screening first time, filters out the single bacterium colony of 8 strains.
Be index with DHA output then, carry out second and take turns screening.That is, the 8 strain bacterial strains that filter out are carried out programmed screening: get an amount of dry thalline respectively, BF routinely
3-methyl alcohol method is directly carried out esterification, and fatty acid methyl ester contrasts by the retention time with the DHA standard substance with the laggard promoting the circulation of qi analysis of hplc of normal hexane extracting, and the DHA in the thalline is carried out qualitative analysis; Adopt the area marker method, the integral relation of the peak area of DHA is determined the concentration of DHA in the sample in internal standard substance nonadecanoic acid that adds in integral relation by nonadecanoic acid standard substance and DHA standard substance peak area and the esterification process and the thalline, then according to the quality of the used thalline sample of the volume of the used normal hexane of extracting lipid acid and esterification, calculate the percentage composition of DHA in the thalline, thereby calculate the output of DHA in the schizochytrium limacinum.Filter out the higher schizochytrium limacinum strain system (seeing Table 1-2) of 3 strain DHA output at last, respectively called after OUC7, OUC23, OUC88.Wherein the DHA content with bacterial strain OUC88 is the highest.
Table 1-2: the comparison of schizochytrium limacinum mutagenic fungi and former starting strain DHA output:
| Bacterial strain | Dry cell weight (h/100mL) | The content of DHA (%) in the cell |
| SR21 | 0.9705 | 18.15 |
| OUC7 | 1.1273 | 19.97 |
| OUC23 | 1.0854 | 22.08 |
Specific embodiment 2: carbon, nitrogen concentration and carbon-nitrogen ratio are to the influence of schizochytrium limacinum OUC88 biomass and DHA content:
Triangle at 250ml shakes in the bottle, add 50ml natural sea-water (taking from the marine site, Qingdao) and 50ml distilled water respectively, press the concentration shown in the table 1 and add carbon source (glucose) and nitrogenous source (yeast extract), transferring pH value is 6.0, behind the autoclaving, insert the pre-incubated OUC88 bacterial classification of 5ml seed liquor, 25 ℃ of following shaking culture are 5 days on the airbath vibrator, and the vibration rotating speed is 180rpm.Centrifugal collection thalline, lyophilize is surveyed its dry weight to constant weight under-50 ℃ of conditions; Get the part thalline, BF routinely
3The esterification of-methyl alcohol method is described in embodiment 1, by the percentage composition of DHA in the gas chromatography determination thalline.The results are shown in Table 2.
Table 2: different substratum proportionings are to the influence of schizochytrium limacinum OUC88 biomass and DHA content
| Instance number | Glucose (g/L) | Yeast extract (g/L) | Dry cell weight (g/100mL) | DHA content (%) in the |
| 1 | 30 | 10 | 1.112 | 25.56 |
| 2 | 30 | 20 | 1.205 | 23.09 |
| 3 | 30 | 30 | 1.456 | 20.62 |
| 4 | 60 | 10 | 1.205 | 28.60 |
| 5 | 60 | 20 | 1.784 | 26.46 |
| 6 | 60 | 30 | 1.917 | 25.34 |
| 7 | 90 | 10 | 0.817 | 29.74 |
| 8 | 90 | 20 | 0.862 | 26.12 |
| 9 | 90 | 30 | 0.850 | 25.81 |
As can be seen from Table 2, dry cell weight increases along with the increase of carbon source concentration, and when glucose concn was 60--70g/L, dry cell weight reached 21-24g/L; When carbon source concentration increased again, dry cell weight was then on a declining curve, and when glucose concn was 90g/L, dry cell weight had only about 8g/L.Nitrogen concentration and dry cell weight also have similarity relation.When yeast extract concentration during in the 10--30g/L scope, dry cell weight increases with the increase of its concentration.Dry cell weight and DHA content do not have linear relation, and the ratio of carbon source and nitrogenous source then affects the accumulation of DHA, and the raising of C/N ratio is beneficial to the accumulation of DHA in the certain limit.
Embodiment 3: schizochytrium limacinum OUC88 upgrowth situation and DHA accumulation Determination on condition in the different times:
Triangle at 150ml shakes in the bottle, add 25ml natural sea-water (taking from the marine site, Qingdao) and 25ml distilled water respectively, adding concentration then is the glucose of 60g/L and the yeast extract of 30g/L, and transferring pH value is 6.0, makees 7 parallel samples simultaneously, behind the autoclaving, insert the pre-incubated seed liquor of 1ml, 25 ℃ of following shaking culture on the airbath vibrator, the vibration rotating speed is 180rpm, took out one bottle of sample every 22 hours and analyze, in the hope of the growth of observation schizochytrium limacinum and the accumulation situation of DHA.Thalline is surveyed its dry weight after centrifugal collection, lyophilize; Content of DHA is measured by the method described in the embodiment 1 in it.The results are shown in Figure 1.
As can be seen from Figure 1, schizochytrium limacinum cell proliferation and DHA accumulation is asynchronous.At preceding 3 days that cultivate, cell quantity was multiple and increases, and by the 4th day, cell number substantially no longer increased, and begins to enter the stable growth phase; And the percentage composition of DHA was stabilized in a lower level at preceding 3 days, and DHA begins a large amount of accumulation after 3 days, tended towards stability about 5 days.Therefore, can be divided into two stages to the process of growth of schizochytrium limacinum: be the cell proliferation stage early stage, the later stage is the DHA accumulation stage.
Embodiment 4:PH value is to the influence of schizochytrium limacinum OUC88 biomass and DHA content:
Triangle at 250ml shakes in the bottle, add 50ml natural sea-water (taking from the marine site, Qingdao) and 50ml distilled water respectively, adding concentration then is the glucose of 60g/L and the yeast extract of 30g/L, transferring pH value respectively is 4.0,5.0,6.0,7.0,8.0, to find out the pH value of the most suitable this bacteria growing and DHA accumulation.Behind the autoclaving, insert the pre-incubated OUC88 seed liquor of 5ml, 25 ℃ of following shaking culture are 5 days on the airbath vibrator, and the vibration rotating speed is 180rpm.Thalline is surveyed its dry weight after centrifugal collection, lyophilize; Percentage composition of DHA is measured by the method described in the embodiment 1 in it.The results are shown in Table 3.
Table 3pH value is to the influence of schizochytrium limacinum OUC88 biomass and DHA content
| Instance number | The pH value | Dry cell weight (g/100mL) | The percentage composition of DHA (%) in the cell |
| 10 | 4.0 | 0.573 | 7.53 |
| 11 | 5.0 | 0.805 | 8.87 |
| 12 | 6.0 | 1.894 | 22.72 |
| 13 | 7.0 | 2.113 | 26.34 |
| 14 | 8.0 | 1.921 | 21.63 |
This bacterium can adapt to the pH environment of relative broad range as can be seen from Table 3, but is beneficial to the growth of cell and the accumulation of DHA near neutral pH value.
Embodiment 5: culture temperature is to the influence of schizochytrium limacinum OUC88 biomass and DHA content:
Prepare substratum as described in example 3 above, transferring pH value is 7.0, behind the autoclaving, inserts the pre-incubated OUC88 seed liquor of 5ml, and respectively 20 ℃, 23 ℃, 25 ℃, 28 ℃, 30 ℃ following shaking culture 5 days, the vibration rotating speed is 180rpm on the airbath vibrator.Thalline is surveyed its dry weight after centrifugal collection, lyophilize; Percentage composition of DHA is measured by the method described in the embodiment 1 in it.The results are shown in Table 4.
Table 4 culture temperature is to the influence of schizochytrium limacinum biomass and DHA content
| Instance number | Culture temperature (℃) | Cell is in heavy (g/100mL) | The percentage composition of DHA (%) in the cell |
| 15 | 20 | 1.522 | 25.03 |
| 16 | 23 | 2.198 | 25.21 |
| 17 | 25 | 2.049 | 22.76 |
| 18 | 28 | 1.233 | 18.87 |
| 19 | 30 | 0.379 | - |
As can be seen from Table 4, the 20--25 ℃ of interior temperature of scope is fit to the growth of schizochytrium limacinum, and biomass can reach 22g/L, and when temperature surpassed 28 ℃, this bacteria growing speed sharply descended, and during to 30 ℃, the growth of this bacterium almost stops.And relative low temperature is beneficial to the accumulation of DHA, and in the time of 20--23 ℃, the percentage composition of DHA is higher.
Embodiment 6: the shaking culture rotating speed is to the influence of schizochytrium limacinum OUC88 biomass and DHA content
Prepare substratum as described in example 3 above, transferring pH value is 7.0, behind the autoclaving, insert the pre-incubated OUC88 seed liquor of 5ml, 23 ℃ of following shaking culture are 5 days on the airbath vibrator, the vibration rotating speed is respectively 150rpm, 180rpm, 4 levels of 200rpm, 220rpm, to measure the influence of shaking culture rotating speed to schizochytrium limacinum biomass and DHA content, the results are shown in Table 5.
Table 5: the shaking culture rotating speed is to the influence of schizochytrium limacinum OUC88 biomass and DHA content:
| Instance number | Shaking culture rotating speed (rpm) | Dry cell weight (g/100mL) | The percentage composition of DHA (%) in the cell |
| 20 | 150 | 1.413 | 18.32 |
| 21 | 180 | 2.058 | 25.48 |
| 22 | 200 | 2.299 | 24.32 |
| 23 | 220 | 2.192 | 23.12 |
As can be seen from Table 5, the content of dry cell weight and DHA all increases with the raising of vibration rotating speed, and this is because the raising of rotating speed has increased the dissolved oxygen of substratum inside, is beneficial to the growth of aerobic schizochytrium limacinum, also promote simultaneously the metabolism of this bacterium, be beneficial to the accumulation of DHA.
Embodiment 7: the later stage is added the influence of glucose to schizochytrium limacinum ouc88 biomass and DHA content:
Triangle at 250ml shakes in the bottle, add 50ml natural sea-water (taking from the marine site, Qingdao) and 50ml distilled water respectively, adding concentration then is the glucose of 60g/L and the yeast extract of 30g/L, transferring pH value respectively is 7.0, behind the autoclaving, insert the pre-incubated seed liquor of 5ml, 23 ℃ of following shaking culture on the airbath vibrator, the vibration rotating speed is 200rpm.Cultivate after 3 days, under aseptic condition, add the autoclaved glucose solution of process of different concns as shown in table 5 respectively, continue then to cultivate 2 days.Thalline is surveyed its dry weight after centrifugal collection, lyophilize; Percentage composition of DHA is measured by the method described in the embodiment 1 in it.The results are shown in Table 6.
Table 6: the later stage is added the influence of glucose to schizochytrium limacinum OUC88 biomass and DHA content:
| Instance number | Mend sugared volume (ml) | Mend sugared concentration (%:m/v) | Dry cell weight (g/100mL) | DHA contains (%) |
| 24 | 0 | 0 | 2.127 | 23.67 |
| 25 | 10 | 0 | 2.093 | 22.12 |
| 26 | 10 | 10 | 2.347 | 27.83 |
| 27 | 10 | 20 | 2.436 | 29.74 |
| 28 | 10 | 30 | 2.567 | 32.23 |
| 29 | 10 | 40 | 2.355 | 32.87 |
| 30 | 10 | 50 | 2.306 | 33.78 |
Interpretation of result by embodiment 1 and embodiment 2 is thought, the culturing process of schizochytrium limacinum can be divided into two stages: preceding 2--3 days is the cell proliferation stage, the carbon source of higher concentration and nitrogenous source are beneficial to the increase of cell number: the later stage is the accumulation stage of DHA, need higher C/N ratio, in substratum, add certain carbon source this moment, the ratio of carbon source and nitrogenous source will be beneficial to the accumulation of DHA in the raising substratum.Evidence is added glucose by the later stage, and dry cell weight slightly increases, and brings up to 25g/L by original 21g/L; DHA content then obviously increases, and brings up to about 34% by original about 24%.The result who obtains like this is that dry cell weight is up to 25g/L, and DHA output is up to 8.27g/L.
Embodiment 8: the physicochemical character analysis of schizochytrium limacinum 0UC88:
Described in embodiment 6, prepare substratum, behind the autoclaving, insert the 5mlOUC88 seed liquor, shaking culture, culture condition is with embodiment 6.Cultivate after 4 days centrifugal collection thalline, lyophilize.
Get the dry thalline of part, chloroform/methanol method is routinely extracted total fat: after the cytoclasis, added the chloroform/methanol mixed solution (2: 1: V/V), mixing is taken out body fluid Folch reagent wash, evaporating solvent, promptly get purer total fat, claim its weight,, calculate the per-cent of total fat in dry cell weight by comparing with used thalline weight.Get the total fat of part again, BF routinely
3-methyl alcohol method is carried out esterification with described in the embodiment 1, determines the composition of each lipid acid in its total fat with the lipid acid of esterification by gas chromatography-mass spectrometry analysis, by with the contrast of corresponding standard product, measure each components contents in total fat, the results are shown in Table 7.
Table 7: the main fatty acid content of schizochytrium limacinum OUC88:
| Fatty acid component | The content (%) of this composition in total fat |
| C14：0 | 2.1 |
| C15：0 | 7.7 |
| C16：0 | 34.6 |
| C18：0 | 1.8 |
| C22：5 | 8.4 |
| C22：6 | 44.2 |
Analyze to find that unsaturated fatty acids is based on DHA in total fat, the content of DHA in total fat reaches 48.53%, in addition, also contains 8% the DPA of having an appointment.And the another kind of ω-content of 3PUFA EPA in this bacterium is very low, less than 1%.A tree name studies have shown that excessive EPA is unfavorable for infant's growth.The thalline of schizochytrium limacinum OUC88 of the present invention is for the additive of exploitation schizochytrium limacinum as the condensed milk of bread foodstuff additive or milk-product, milk sheet, especially infant formula, very nutritious value and improving one's physical development.
Get the dry thalline of part respectively, method is routinely formed its protein content, amino acid respectively and ash content is measured, and the results are shown in Table 8-1,8-2.Also find in addition, also contain a kind of medicinal ingredients taurine in this bacterium, this is a reported first in the document at home and abroad, and this has further improved the development and application values of this bacterium.
Table 8-1: schizochytrium limacinum OUC88 physicochemical character is analyzed:
| Composition | Content (mg/100mg) |
| Total protein | 9.52 |
| Total fat | 78.40 |
| Ash content | 5.8 |
Table 8-2: amino acid composition analysis among the schizochytrium limacinum OUC88:
| The amino acid title | Content (mg/100mg) |
| Aspartic acid | 1.11 |
| Threonine | 0.35 |
| Serine | 0.38 |
| L-glutamic acid | 1.54 |
| Glycine | 0.36 |
| L-Ala | 0.43 |
| Gelucystine | - |
| Xie Ansuan | 0.69 |
| Methionine(Met) | 0.11 |
| Isoleucine | 0.25 |
| Leucine | 0.51 |
| Tyrosine | 0.25 |
| Phenylalanine | 0.37 |
| Methionin | 0.41 |
| Histidine | 0.12 |
| Arginine | 0.07 |
| Proline(Pro) | 0.43 |
| Summation | 7.56 |
To sum up; the somatic cells of bacterial strain OUC88 of the present invention; have with it and to contain 45---total fat of 80%; wherein unsaturated fatty acids reaches 23 based on the content of DHA---and 44%; also contain 7---11% DPA, L-glutamic acid and aspartate content are also higher, contain 0.4---1% taurine; other contains the performance of omega-3 polyunsaturated fatty acids (EPA)≤1%, uses as the wholesome food in the additive of making food, milk-product and infant formula thereof.
Embodiment 9: strengthen the experiment of wheel animalcule DHA as food nutrition with schizochytrium limacinum OUC88 bacterium powder;
Wheel animalcule is incubated in the 2m3 glass reinforced plastic tank, and the water body in each glass reinforced plastic tank is 1m3, and water temperature is 25 ℃, and Chlorococcum concentration is 8,500,000 cell/ml, fully ventilation.Experiment is divided into A, B, four groups of C, D, and the A group is only added Chlorococcum for control group, and B, C, D group add the schizochytrium limacinum that concentration is 20mg/L, 50mg/L, 80mg/L respectively for experimental group, and each group of other conditions is all consistent.Under anatomical lens, observed the detection wheel animalcule in 3,6,9,12,18 hours, collect each wheel animalcule sample of observing, lyophilize under-50 ℃ of conditions with 300 mesh sieve thin,tough silk.Get the cryodesiccated wheel animalcule of part, BF routinely
3The esterification of-methyl alcohol method, described in embodiment 1, the content of gas chromatography determination wheel animalcule DHA.
The accumulation measurement result of DHA in each group wheel polypide of table 9 experiment
| Group | A | B | C | D | |
| During beginning | DHA/FA(％) | Do not detect | Do not detect | Do not detect | Do not detect |
| DHA(mg/g) | 0 | 0 | 0 | 0 | |
| After 3 hours | DHA/FA(％) | Do not detect | 2.47 | 2.61 | 3.53 |
| DHA(mg/g) | 0 | 0.67 | 3.5 | 4.67 | |
| After 6 hours | DHA/FA(％) | Do not detect | 3.86 | 4.86 | 7.54 |
| DHA(mg/g) | 0 | 1.38 | 5.04 | 5.31 | |
| After 9 hours | DHA/FA(％) | Do not detect | 4.73 | 8.43 | 10.02 |
| DHA(mg/g) | 0 | 4.01 | 6.51 | 6.87 | |
| After 12 hours | DHA/FA(％) | Do not detect | 5.98 | 10.21 | 13.44 |
| DHA(mg/g) | 0 | 4.42 | 7.85 | 8.14 | |
| After 18 hours | DHA/FA(％) | Do not detect | 5.16 | 10.74 | 12.53 |
| DHA(mg/g) | 0 | 3.99 | 5.45 | 5.73 |
Annotate: FA represents that total fatty acids % represents to contain in the dried wheel animalcule powder of percentage composition DHA (mg/g) the every gram of expression the milligram number of DHA.
As known from Table 9: schizochytrium limacinum OUC88 has the effect of the intravital DHA content of remarkable increase wheel animalcule.The content of three experimental group B, C, D DHA/FA in strengthening 12 hours trailing wheel polypides is respectively 5.98%, 10.21% and 13.44%, and the net content of DHA is respectively 4.42mg/g, 7.85mg/g, 8.14mg/g in the dry wheel animalcule powder of every gram; And control group A does not all detect the intravital DHA content of wheel animalcule in whole experiment.Find out also that from experiment after surpassing 12 hours, the intravital DHA content of wheel animalcule significantly descends, therefore, the time that makes wheel animalcule accumulate DHA in vivo is advisable to be no more than 12 hours.
Embodiment 10: the wheel animalcule of strengthening with the schizochytrium limacinum OUC88 anti-albefaction effect test of turbot seedling of feeding;
Experiment is divided into three groups of A, B, C, and every group of turbot seedling 200 tails are incubated in the 50L plastic tank, water body 20L, and the water source is filtering nature seawater, through disinfection by ultraviolet light.Newly hatched larvae is cultivated 14 ℃ of temperature.Be warming up to 16 ℃ later on gradually.Sea water salinity 28 ‰, pH value 8.6.Light source is a source of artificial light, water surface 200-2000lx.Prelarva little inflation in early stage, the prelarva later stage is strengthened aeration quantity.Every day soil pick-up once, to remove dirt at the bottom of the pond.Fully ventilation.The wheel animalcule (the only wheel animalcule of feeding with chlorella) that the A group is thrown something and fed and do not strengthened, the wheel animalcule that the B group is thrown something and fed and strengthened with Japanese cuttlefish glycerine, the wheel animalcule that the C group is thrown something and fed and strengthened with schizochytrium limacinum OUC88, other term harmonizations are observed the prelarva survival condition every day.、
The anti-albefaction experimental result of table 10 turbot
| Reinforcer consumption (mg/L) | Prelarva quantity (tail) when initial | Albefaction seedling number (tail) during end | Albefaction rate (%) | |
| A | 0 | 200 | 119 | 59.5 |
| B | 30 | 200 | 18 | 9.0 |
| C | 80 | 200 | 13 | 6.5 |
When experiment finished, the growth velocity of the turbot of not strengthening wheel animalcule of feeding was minimum, and albinism is serious in the growth course, and albefaction rate is up to 59.5%; Between the turbot group of two reinforcement wheel animalcules of feeding, the turbot growth velocity of feeding with schizochytrium limacinum OUC88 reinforcement wheel animalcule is higher than the turbot of feeding with Japanese cuttlefish glycerine reinforcement wheel animalcule, it is active to ingest, the melanocyte growth conditions of skin is good, B group turbot albefaction rate is 9.0%, C group turbot albefaction rate is 6.5%, and C group albefaction rate will be lower than B group albefaction rate.And when albefaction took place seedling, the albefaction area of strengthening the turbot that wheel animalcule feeds with schizochytrium limacinum OUC88 also was far smaller than the albefaction area of the turbot of feeding with Japanese cuttlefish glycerine reinforcement wheel animalcule.Illustrate that the feed anti-albefaction effect of turbot seedling of the wheel animalcule of strengthening with schizochytrium limacinum OUC88 is better than the anti-albefaction effect that the Japanese cuttlefish glycerine of traditional usefulness is strengthened the turbot that wheel animalcule feeds, and safe and reliable.
Those of ordinary skill in the art can understand, and in protection scope of the present invention, makes amendment for the foregoing description, and it all is possible adding and replacing, and it does not all exceed protection scope of the present invention.
Claims (4)
1, the application of a kind of ocean schizochytrium limacinum (Schizochytrium limacinum) OUC88 in preparation DHA, it is characterized in that: described ocean schizochytrium limacinum OUC88 bacterial strain has the rich docosahexenoic acid that produces (to be called for short: ability DHA), its culture presevation number: CGMCC No.1240, preservation date: 2004.10.27.
2, according to the described ocean of claim 1 schizochytrium limacinum (Schizochytrium limacinum) OUC88 in the application of preparation among the DHA, it is characterized in that: the optimization culture condition of described ocean schizochytrium limacinum OUC88 bacterial strain is,
Inoculum size with 1-10% inserts pre-incubated seed liquor;
At the cultivation initial stage of this bacterium, adopt carbon, nitrogen concentration all at the substratum of 60-30g/L;
3-4 days in the middle and later periods of cultivating begin to add carbon source, and the raising carbon-nitrogen ratio is 2-5: 1;
Under 18-30 ℃ of condition, the vibration rotating speed is 100-250rpm on the airbath vibrator, shaking culture 3-7 days;
Centrifugal collection thalline after the lyophilize, is surveyed the content of DHA in somatic cells dry weight and the mensuration thalline.
3, according to the described ocean of claim 2 schizochytrium limacinum (Schizochytrium limacinum) OUC88 in the application of preparation among the DHA, it is characterized in that: described substratum is,
With glucose or glycerine or fructose is carbon source,
With yeast extract or peptone is nitrogenous source, joins in the mixed solution of natural sea-water and distilled water;
Wherein seawater accounts for the 20%-80% of substratum;
Wherein carbon source concentration is 10-80g/L, and nitrogen concentration is 6-40g/L;
The pH value of preparation substratum is at 4-8.
4, a kind of schizochytrium limacinum of ocean according to claim 1 (Schizochytrium limacinum) OUC88 is at preparation food; the additive of milk-product and infant formula thereof; or the application in feed and the fodder additives thereof; it is characterized in that: described somatic cells; it contains total fat of 45-80%, and the content of DHA is 23-44% in wherein total fat, and the content of DPA is 7-11%; the content of taurine is 0.4-1%, and the content of omega-3 polyunsaturated fatty acids is≤1%.
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