CN104257517A - Improved hydroxyapatite as well as preparation method and application thereof - Google Patents
Improved hydroxyapatite as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention belongs to the technical fields of biological medicines and articles of everyday use and in particular relates to improved hydroxyapatite, a preparation method of the hydroxyapatite as well as application of the hydroxyapatite in preparation of hydroxyapatite-chitosan composite gel with the effect of improving the gingivitis. Toothpaste prepared by using the improved hydroxyapatite has good effects of improving symptoms such as red and swollen gums and bleeding gums caused by the gingivitis, has a certain effect of relieving bad breath, does not have an obvious adverse reaction and also has a certain effect of improving and treating the oral mucosa ulcer.
Description
Technical field
The invention belongs to biological medicine and article of everyday use technical field, be specifically related to a kind of modified hydroxylapatite and preparation method thereof and preparing the purposes having and improve in the hydroxyapatite-chitosan plural gel of gingivitis effect.
Background technology
Vertebrates sclerous tissues (as skeleton and tooth) be a kind of by organic and inorganic nano-hybrid body the complex that forms, wherein inorganic matter is mainly nano-grade hydroxy apatite [Ca
10(PO
4)
6(OH)
2, Hydroxyapatite, is called for short HA], in the enamel of people, the content of hydroxyapatite is more than 95%.The hydroxyapatite of synthetic, owing to having excellent biocompatibility, has certain inducing action to new bone growth, thus shows one's talent in numerous synthetic bone substitutes, attracts tremendous attention.In addition, hydroxyapatite has the effects such as certain remineralization, desensitization and whitening to oral cavity health, and being applied to toothpaste has had a lot of report, has launch products in the country such as Japanese, American-European.
The deficiency such as there is high-crystallinity easily biological-degradable, absorption and remineralization effect be not slower in simple HA, in medical practice, based materials also also exists some problems in rate of dissolution, biological activity and the bond strength between coating and matrix, drastically influence the long-time stability of implant.In order to develop and explore the Bone Defect Repari and oral cavity health material that are more suitable for clinical practice, the performance improving hydroxyapatite has become a focus of research.Since the eighties in 20th century, much research is from hydroxyapatite molecular structure and bionics angularly, with the hydroxyapatite of synthetic for matrix, adopt the methods such as ion exchange, organic or inorganic are material doped, compound, the physical and mechanical properties of hydroxyapatite, surface and overall biological activity are improved.But the hydroxyapatite of synthetic is used for the problems such as sclerous tissues replaces and oral cavity health also comes with some shortcomings, as undesirable in physical and mechanical properties, fragility is large, bone inductive effect is weak.From bionics angle, require to keep HA in bone substitute to be nm regime, to avoid HA agglomerate grain as far as possible, so tradition use ceramic sintered bodies in HA granule due to degree of crystallinity high, generally all in the above size of micron, greatly differing from each other with the size of nature bone apatite, application is restricted, therefore generally can only select HA non-sintered body or HA slurry when preparing bone renovating material.But thing followed problem is, HA goods only have could obtain good mechanical property by sintering, there is forming difficulty in simple HA powder body or slurry, bears the ability extreme difference that external force and liquid washes away, and can not be used as the problems such as the repair materials of load-bearing bone tissue.
In skeleton, except calcium orthophosphate base material, also has the trace element of numerous species, as Mg
2+, Mn
2+, Zn
2+, Na
+deng.These ions are due to directly related and play very important effect in human body with metabolic more than the 200 kinds of enzyme of participation.Therefore, based on bionic principle, hydroxyapatite molecular structure is improved to the focus becoming research.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of modified hydroxylapatite being more suitable for Clinical mouth healthcare applications, and further discloses its preparation method and purposes.
For solving the problems of the technologies described above, the present invention is achieved through the following technical solutions:
A kind of modified hydroxylapatite of the present invention, described modified hydroxylapatite is hydroxyapatite doped with Al
3+, Na
+, K
+and Mg
2+carry out the complex of degree of depth mineralising.
The above-mentioned modified hydroxylapatite of the present invention, is prepared by following raw material: hydroxyapatite 100-300 weight portion, aluminium hydroxide 1-5 weight portion, sodium chloride 20-70 weight portion, potassium chloride 2-10 weight portion, magnesium chloride 20-70 weight portion.
The above-mentioned modified hydroxylapatite of the present invention, is prepared by following raw material: hydroxyapatite 200 weight portion, aluminium hydroxide 2 weight portion, sodium chloride 45 weight portion, potassium chloride 6 weight portion, magnesium chloride 45 weight portion.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, comprises the steps:
(1) take hydroxyapatite, the aluminium hydroxide of selected weight portion, add concentrated nitric acid, stir and make, to dissolving completely, to obtain A liquid;
(2) take sodium chloride, potassium chloride, the magnesium chloride of selected weight portion, add water to be stirred to and dissolve completely, filter to obtain B liquid;
(3) by described A liquid and the mixing of B liquid, and adjust ph is >=10, obtains white suspension;
(4) described suspension is stirred completely, and in left at room temperature ageing, it is neutral for filtering also taking precipitate washing to filtrate, dries, to obtain final product.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, in described step (3), adopts sodium hydroxide solution adjust ph >=10 of 5%-25%.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, in described step (1), the mass concentration of described concentrated nitric acid is 65-70%, and preferably 68%; The addition of described concentrated nitric acid and the weight ratio of described hydroxyapatite and aluminium hydroxide total amount are 2-4:1.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, in described step (2), the weight ratio of the addition of described water and described sodium chloride, potassium chloride and magnesium chloride total amount is 2-5:1.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, in described step (4), described white suspension is little up to stirring completely in 20-50rpm Keep agitation 2-6, and the time of described still aging step is 12-48 hour.
The preparation method of the above-mentioned modified hydroxylapatite of the present invention, in described step (4), also comprises the described modified hydroxylapatite after drying that to be ground into particle diameter be 200-400 object step.
The above-mentioned modified hydroxylapatite of the present invention has in preparation the purposes improved in the hydroxyapatite-chitosan plural gel of gingivitis effect.
Modified hydroxylapatite of the present invention is with hydroxyapatite doped with Al
3+, Na
+, K
+and Mg
2+obtained, based on bionic principle, hydroxyapatite molecular structure is improved, on the basis keeping hydroxyapatite character, owing to the addition of the Mg that directly can affect the calcification process of skeleton
2+, contribute to affecting the crystallization and forming process that even control area of new bone mineral, the biological activity of the modified hydroxylapatite material of synthesis has important medical value.The gel toothpaste prepared with described modified hydroxylapatite has the red swelling of gingiva caused by gingivitis and gingival hemorrhage symptom and improves effect preferably, certain mitigation is had to halitosis, without obvious adverse reaction, stomatocace also tool is had some improvement and therapeutical effect.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein:
Fig. 1 is the comparing of experimental group and the every index baseline values of matched group periodontal in experimental example 1;
Fig. 2 is the comparing of experimental group and matched group PLI in experimental example 1, *: compare with baseline, P < 0.05; #: compared with 2 weeks, P < 0.05; ◎: compare with matched group, P < 0.05;
Fig. 3 is the comparing of experimental group and matched group BI in experimental example 1, *: compare with baseline, P < 0.05; #: compared with 2 weeks, P < 0.05; ◎: compare with matched group, P < 0.05;
Fig. 4 is the comparing of experimental group and matched group GI in experimental example 1, *: compare with baseline, P < 0.05; #, compared with 2 weeks, P < 0.05; ◎: compare with matched group, P < 0.05.
Experimental example
Experimental example 1
Hydroxyl apatite-chitosan plural gel efficacy factor toothpaste is to the clinical verification improving gingivitis
One, materials and methods
In order to verify that namely hydroxyapatite-the chitosan plural gel containing modified hydroxylapatite of the present invention improves the effect of gingivitis containing (HA/SHA/CS) pluralgel efficacy factor toothpaste, we and front three stomatological hospital are cooperated, adopt double-blind method, after the patient suffering from gingivitis problem is used, the darker Dentist of, qualification really up to the mark by technology carries out examination of mouth, and carries out statistical analysis to result of the test.
1, case selection
Choose the patient that clinical diagnosis is gingivitis, inclusive criteria: whole body health in order and simultaneously coordinate inspection on time; 20 teeth are at least retained in oral cavity; Gingival index >=1.0; Expection can complete this experiment and be willing to that being intended to tested period avoids using other toothpaste and taking antibiotics, does not use other oral hygiene measures (dental floss, collutory etc.); To oral cavity health care products without allergies.
Exclusion standard: long-term taking chemicals at present; Having the systemic disease oral mucosas such as digestive tract ulcer to have needs the focus for the treatment of or the ulcer of serious recurrent exerbation; Dentures repai or wear orthodontic appliance person, the person that there is ill fitting prosthesis in oral cavity; Took antibiotic before baseline inspection in 2 weeks or carried out periodontal treatment; Diabetes, hepatitis B, tuberculosis or other infection or metabolic disease patient; Allergies person is had to oral cavity health care product; Need to use any medicine person likely causing gingiva to react; Pregnancy women.
Before all clinical experiments start, volunteer is all signed Informed Consent Form and is provided medical history taking.
2, test specimen
Outward appearance indicates consistent, is marked with A, B printed words respectively.A is for containing (HA/SHA/CS) pluralgel efficacy factor toothpaste, and B is not containing (HA/SHA/CS) pluralgel efficacy factor toothpaste.
The preparation of 2.1 (HA/SHA/CS) pluralgel efficacy factor toothpaste
Raw material: glycerol 5%, sorbitol 20%, sodium carboxymethyl cellulose (CMC) l%, sodium lauryl sulfate 2%, silica 1 5%, calcium hydrogen phosphate 25%, hydroxyapatite-chitosan plural gel i.e. (HA/SHA/CS) pluralgel 2% prepared by embodiment 4, saccharin sodium 0.2%, essence l%, water surplus.
According to above composition of raw materials, adopt conventional toothpaste manufacturing process, can obtain containing (HA/SHA/CS) pluralgel efficacy factor toothpaste.
Above-mentioned toothpaste is by the quality examination condition specified and examination cycle, and observe through high/low temperature, room temperature, mastic outward appearance is normal, and obvious change does not occur for color, taste, and every physical and chemical index reaches the requirement of toothpaste standard GB/T 8372.
2.2 toothbrush
360 ° of toothbrushes that all experimenters use Guangzhou Colgate-Palmolive company limited to produce.
3, test method
3.1 test principles
This experiment is in accordance with random, double blinding, control experiment principle.
3.2 observational techniques and index
3.2.1 the change of chief complaint (as gingival hemorrhage and halitosis etc.) before and after toothpaste uses of patient is recorded
1) halitosis: be divided into and often have, occasionally has, and is recorded in without Three Estate the change that toothpaste uses front and back.
2) gingival hemorrhage: be divided into and often have, occasionally has, and is recorded in without Three Estate the change that toothpaste uses front and back.
Z: hematostaxis (morning rise tell saliva have bloodstain)
C: hemorrhage after stimulating (brush teeth or to sting hard object hemorrhage, suck hemorrhage)
3.2.2 periodontal training observation index
3.2.2.1 gingival index (gingival index, GI)
0=gums healthy; 1=gingiva mild inflammation: the color and luster of gingiva has MC and with Mild edema, spy is examined not hemorrhage; 2=gingiva moderate inflammation: gingiva color is red, edema is bright, spy is examined hemorrhage; 3=gingiva extensive inflammation: gingiva is obviously red and swollen or have ulcer, has automatic bleeding tendency.
Inspection method: Williams periodontal probe is put into gingival edge gingival sulcus opening part, and slides gently along gum edge, gingiva tissue is only involved by slight.
3.2.2.2 plaque index (plaque index, PLI)
0=facing is without bacterial plaque; 1=nearly gum edge place facing is dispersed in mottled bacterial plaque; 2=nearly gum edge place facing has thin bacterial plaque to become band continuously, and width is no more than 1mm; 3=bacterial plaque colored band is greater than 1mm but the area of coverage is less than the neck 1/3 of corona; The 4=bacterial plaque area of coverage is between 1/3 ~ 2/3 of corona; The 5=bacterial plaque area of coverage is more than 2/3 or 2/3 of corona.
Inspection method: plaque disclosing agent coats facing, reexamines painted bacterial plaque in the Germ distribution of facing and scope after gargling.
3.2.2.3 bleeding index (bleeding index, BI)
Inspection method: Williams periodontal probe gently probes into gingival sulcus, takes out probe after 30 seconds, observes with or without hemorrhage and extent of hemorrhage.
Score with 0 to 5 grade: 0=gums healthy, NIP and hemorrhage; 1=gingiva color has struvite change, and spy is examined not hemorrhage; 2=has petechial hemorrhage after visiting and examining; 3=visits to examine and hemorrhagely to spread along gingival margin; 4=goes out blood flow to expire and overflows gingival sulcus; 5=is automatically hemorrhage.
3.2.2.4 experiment process
Check that tooth position is that Ramfjord index tooth (checks 16,21,24,36,41,44 representatives arranged as dental pattern, if 1 index anodontia, to be replaced by its middle adjacent teeth 17,11,25,37,42 or 45 far away), when checking BI and GI, each index tooth checks 6 sites: nearly middle buccal surface, buccal surface center, middle buccal surface far away, nearly middle lingual surface, lingual surface center and middle lingual surface far away, record reacts the heaviest position.When checking PLI, check buccal labial surface and the tongue palatal surface of each index tooth, record the heaviest position.
3.2.3, while each periodontal checks, oral soft tissue situation is checked, in order to evaluate the effect of toothpaste oral cavity soft tissue.
3.3 experimental technique
Screening meets inclusive criteria and exclusion standard person, and be divided into A (experimental group), B (matched group) two groups by random table, two groups substantially identical in health, the periodontal disease order of severity, age, sex ratio.360 ° of toothbrushes that patient's unified use Guangzhou Colgate-Palmolive company limited produces, and church uses Bass brushing to brush teeth, every day, sooner or later respectively once each consumption was about 2g (extrude toothpaste and be about 1.5cm), brushes teeth 3 minutes at every turn.The the 2nd, 4 week that tests time, the clinical indices of experimenter is reevaluated according to the program of baseline inspection.Gingivitis indices, plaque index, bleeding index is checked respectively by 2 stomatological medical doctors respectively during inspection.Examiner has carried out self replica test on pretreatment with in experiment, unified checking tool and every inspection indication.Gingival index and bleeding index inspection are estimated after adopting Williams periodontal probe to visit tactile gingival sulcus.Plaque index carries out after gingival index and bleeding index detect, with reading after plaque indicator agents (basic fuchsin) dyeing.
3.4 statistical analysis
Independent samples t test assay is adopted respectively to organize latter 4th week of experiment and the 2nd week index variation situation.
4, experimental result
This experiment is collection person 258 example that meets inclusive criteria altogether, and because part object of study is in succession lost to follow-up when 2 weeks or 4 weeks, finally include in 135 routine object of study of research, experimental group 69 is routine, and matched group 66 is routine.
4.1 periodontal training observation index
4.1.1 the comparison of experimental group, the every index baseline values of matched group periodontal
Experimental result as shown in Figure 1, during baseline, experimental group and matched group three clinical indices: plaque index (PLI), gingival hemorrhage index (BI), gingival index (GI) there was no significant difference (P>0.05).Result shows, experimental group and matched group two groups have comparability.
4.1.2 the comparison of baseline and use toothpaste experimental group, the every index of matched group periodontal after 2 weeks, 4 weeks
4.1.2.1PLI
As shown in Figure 2, experimental group and matched group are after baseline, experiment 2 weeks, testing 4 weeks, and along with the prolongation of toothpaste service time, compare between three time points, PLI value reduces gradually, and difference all has statistical significance for experimental result.At baseline, when testing 2 weeks and 4 weeks, between experimental group and matched group, there are no significant for PLI difference.
4.1.2.2BI
Experimental result as shown in Figure 3, at baseline, test 2 weeks, and after testing 4 weeks, compare between three time points, BI value reduces gradually, and difference all has statistical significance by experimental group and matched group.When experiment 2 weeks, between experimental group and matched group, BI value had significant difference, and experimental group BI value comparatively matched group obviously reduces.When experiment 4 weeks, BI value at two group differences without significance.
4.1.2.3GI
Experimental result as shown in Figure 4, matched group at baseline, test 2 weeks, test 4 weeks after, compare between three time points, GI value reduces gradually, and difference has statistical significance.Experimental group baseline, experiment 2 weeks, test 4 weeks after, GI value reduces gradually, and between baseline and experiment 2 weeks, difference has statistical significance, but tests 2 weeks and test no significant difference between 4 weeks.When experiment 2 weeks, between experimental group and matched group, GI difference had significance, and experimental group GI value comparatively matched group obviously reduces; When experiment 4 weeks, there are no significant at two group differences for GI.
4.2 chief complaint
4.2.1 baseline, experiment are after 2 weeks and 4 weeks, and between experimental group and matched group, the chief complaint of patient describes (comprising halitosis and gingival hemorrhage) no significant difference.
4.2.2 the comparison between experimental group and matched group three time points
4.2.2.1 halitosis
When testing 2 weeks, compared with before experiment, the halitosis of two groups of patients is not improved.When testing 4 weeks, compared with before experiment, two groups of patient's halitosiss all alleviate, and difference has statistical significance.After using 4 weeks, the ratio that experimental group and matched group obtain halitosis improvement is respectively 73% and 55%.4.2.2.2 hemorrhage after stimulating
After the stimulation of two groups of patients, bleeding is alleviated before comparatively testing when experiment 2 weeks, experiment 4 weeks all to some extent, and difference all has statistical significance.
4.2.2.3 hematostaxis
Hematostaxis symptom equal not statistically significant of difference between three time points of two groups of patients.
4.3 untoward reaction
132 study subjects all do not find obvious adverse reaction at experimental session, have no significant effect oral mucosa and the sense of taste, and most study subject thinks toothpaste mouthfeel " well ".
Two, conclusion
By gingival index (GI), sulcular bleeding index (BI), plaque index (plaque index, PLI) testing standard, use containing (HA/SHA/CS) pluralgel efficacy factor toothpaste to gingivitis patient, observe the cosmetic variation of experimenter's gingivitis.
By this clinical trial, can draw to draw a conclusion:
1, under this experiment condition, have the red swelling of gingiva caused by gingivitis and gingival hemorrhage symptom containing (HA/SHA/CS) pluralgel efficacy factor toothpaste and improve effect preferably.
2, under this experiment condition, certain mitigation is had containing (HA/SHA/CS) pluralgel efficacy factor toothpaste to halitosis.
3, under this experiment condition, use containing (HA/SHA/CS) pluralgel efficacy factor toothpaste without obvious adverse reaction, have no significant effect oral mucosa and the sense of taste, most study subject thinks toothpaste mouthfeel " well ".
Experimental example 2 pluralgel is to Cavia porcellus dental gingivitis therapeutic effect research experiment
One, experimental technique
Cavia porcellus is divided into 6 one group, male and female half and half.No. 5 syringe needles only exposing syringe needle place 1mm are held together with 6, stab the gingiva place in the middle of Cavia porcellus two lower front tooths, and pick n-butyric acie with cotton swab and smear wound, Taking Pictures recording inflammation after 24 hours, test group often only smears sample 100mg at inflammation place every day, matched group does not process, by gingival index (GI) standard grading record inflammatory conditions.
Gingival index (GI) standard grading: 0 grade: NIP; 1 grade: slight inflammation, gingiva color is rubescent, and light weight micromodification becomes, not hemorrhage; 2 grades: moderate inflammation, gingiva is rubescent, loose, spy is touched hemorrhage; 3 grades: severe inflammation, gingiva is rubescent, edema, hypertrophy, ulcer, hematostaxis.
Two, experimental result
The gingival index of table 1 record every day
| ? | Test group | Matched group |
| First day | 3±0 | 3±0 |
| Second day | 3±0 | 3±0 |
| 3rd day | 2.87±0.84 | 3±0 |
| 4th day | 2.4±0.49 | 3±0 |
| 5th day | 2.17±0.37* | 2.83±0.37 |
| 6th day | 1.83±0.37* | 2.67±0.47 |
| 7th day | 1.5±0.5* | 2.4±0.49 |
| 8th day | 1.17±0.37* | 2.33±0.75 |
| 9th day | 0.67±0.47** | 2.17±0.37 |
| Tenth day | 0.17±0.37** | 2±0.63 |
*p<0.05，**p<0.01
Table 2 healing days
| ? | Test group | Matched group |
| Healing days | 10.3±1.7** | 16.8±2.5 |
*p<0.05，**p<0.01
From table 1 and 2 data, the toothpaste containing hydroxyapatite-chitosan gel rubber factor of the present invention can effectively improve gingiva symptom, shortens the healing time of gingiva disease.
Detailed description of the invention
For a more detailed description to the present invention by embodiment below, following examples are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.
Embodiment 1
Described in the present embodiment, the preparation method of modified hydroxylapatite comprises the steps:
A () takes hydroxyapatite 200kg, aluminium hydroxide 2kg, add the concentrated nitric acid (commercially available product) that 2.5 weight times amount mass concentrations are about 68%, stirs and makes to dissolve completely, obtain A liquid;
B () takes sodium chloride 45kg, potassium chloride 6kg, magnesium chloride 45kg mixes, and adds 3 weight times amount purified water, stirs and makes to dissolve completely, filters, obtains B liquid;
C (), by above-mentioned A liquid and the mixing of B liquid, adds 10% sodium hydroxide solution and regulates its pH value >=10, form white suspension;
D () is by described suspension Keep agitation after 3 hours under 30rpm rotating speed, stop stirring, by material at room temperature still aging 24 hours, compression filtration filters, taking precipitate deionized water wash to filtrate is neutral, and in 105 ± 2 DEG C of oven dry, pulverize, cross 325 mesh sieves, to obtain final product.
Embodiment 2
Described in the present embodiment, the preparation method of modified hydroxylapatite comprises the steps:
A () takes hydroxyapatite 100kg, aluminium hydroxide 5kg, add the concentrated nitric acid (commercially available product) that 4 weight times amount mass concentrations are about 68%, stirs and makes to dissolve completely, obtain A liquid;
B () takes sodium chloride 20kg, potassium chloride 2kg, magnesium chloride 20kg, add 5 weight times amount purified water, stirs and makes to dissolve completely, filters, obtains B liquid;
C (), by above-mentioned A liquid and the mixing of B liquid, adds 25% sodium hydroxide solution and regulates its pH value to be >=10, form white suspension;
D () is by described suspension Keep agitation after 2 hours under 50rpm rotating speed, stop stirring, by material at room temperature still aging 48 hours, compression filtration filters, taking precipitate deionized water wash to filtrate is neutral, and in 105 ± 2 DEG C of oven dry, pulverize, cross 400 mesh sieves, to obtain final product.
Embodiment 3
Described in the present embodiment, the preparation method of modified hydroxylapatite comprises the steps:
A () takes hydroxyapatite 100kg, aluminium hydroxide 1kg, add the concentrated nitric acid (commercially available product) that 2 weight times amount mass concentrations are about 68%, stirs and makes to dissolve completely, obtain A liquid;
B () takes sodium chloride 70kg, potassium chloride 10kg, magnesium chloride 70kg, add 2 weight times amount purified water, stirs and makes to dissolve completely, filters, obtains B liquid;
C (), by above-mentioned A liquid and the mixing of B liquid, adds 5% sodium hydroxide solution and regulates its pH value to be >=10, form white suspension;
D () is by described suspension Keep agitation after 6 hours under 20rpm rotating speed, stop stirring, by material at room temperature still aging 12 hours, compression filtration filters, taking precipitate deionized water wash to filtrate is neutral, and in 105 ± 2 DEG C of oven dry, pulverize, cross 200 mesh sieves, to obtain final product.
Embodiment 4
Described in the present embodiment, the preparation method of modified hydroxylapatite comprises the steps:
A () takes hydroxyapatite 300kg, aluminium hydroxide 2kg, add the concentrated nitric acid (commercially available product) that 2.5 weight times amount mass concentrations are about 68%, stirs and makes to dissolve completely, obtain A liquid;
B () takes sodium chloride 45kg, potassium chloride 6kg, magnesium chloride 45kg mixes, and adds 3 weight times amount purified water, stirs and makes to dissolve completely, filters, obtains B liquid;
C (), by above-mentioned A liquid and the mixing of B liquid, adds 10% sodium hydroxide solution and regulates its pH value >=10, form white suspension;
D () is by described suspension Keep agitation after 3 hours under 30rpm rotating speed, stop stirring, by material at room temperature still aging 24 hours, compression filtration filters, taking precipitate deionized water wash to filtrate is neutral, and in 105 ± 2 DEG C of oven dry, pulverize, cross 325 mesh sieves, to obtain final product.
Embodiment 5
Raw material: modified hydroxylapatite 35kg, the chitosan 30kg of the preparation of hydroxyapatite 35kg, embodiment 1.
Described in the present embodiment, the preparation method of hydroxyapatite-chitosan plural gel comprises the steps:
(1) take hydroxyapatite and modified hydroxylapatite, add 20 weight times amount purified water, stir and make formation suspension, add the concentrated nitric acid (commercially available product) that mass concentration is about 68% while stirring and adjust pH of suspension to 2, A liquid must be clarified;
(2) take chitosan, add 60 weight times amount 0.5% acetic acid solutions, be stirred to chitosan and dissolve completely, filter, obtain B liquid;
(3) A liquid is mixed homogeneously with B liquid, add 10% sodium hydroxide solution and regulate pH >=10;
(4) continue stirring after 12 hours, stop stirring, material at room temperature ageing 24 hours, filter, taking precipitate deionized water wash to filtrate is neutral;
(5) prepare the PBS buffer 2000kg of pH7.0, mixed by precipitate, mixing speed 50rpm with PBS buffer, open 3000rpm homogenizing 20 minutes simultaneously, stop homogenizing, continue stirring 2 hours, stop stirring, discharging, obtains pluralgel.
Get described gel and add customary adjuvant, adopt common process to obtain toothpaste.
Embodiment 6
Raw material: modified hydroxylapatite 20kg, the chitosan 50kg of the preparation of hydroxyapatite 40kg, embodiment 2
Described in the present embodiment, the preparation method of hydroxyapatite-chitosan plural gel comprises the steps:
(1) take hydroxyapatite and modified hydroxylapatite, add 25 weight times amount purified water, stir and make formation suspension, add the concentrated nitric acid (commercially available product) that mass concentration is about 68% while stirring and adjust pH of suspension to 2, A liquid must be clarified;
(2) take chitosan, add 80 weight times amount 0.3% acetic acid solutions, be stirred to chitosan and dissolve completely, filter, obtain B liquid;
(3) A liquid is mixed homogeneously with B liquid, add 20% sodium hydroxide solution and regulate pH >=10;
(4) continue stirring after 12 hours, stop stirring, material at room temperature ageing 12 hours, filter, taking precipitate deionized water wash to filtrate is neutral;
(5) prepare the PBS buffer 2500kg of pH7.5, mixed by precipitate, mixing speed 80rpm with PBS buffer, open 4000rpm homogenizing 15 minutes simultaneously, stop homogenizing, continue stirring 4 hours, stop stirring, discharging, obtains pluralgel.
Get described gel and add customary adjuvant, adopt common process to obtain tooth and paste.
Embodiment 7
Raw material: modified hydroxylapatite 10kg, the chitosan 20kg of the preparation of hydroxyapatite 50kg, embodiment 3
Described in the present embodiment, the preparation method of hydroxyapatite-chitosan plural gel comprises the steps:
(1) take hydroxyapatite and modified hydroxylapatite, add 30 weight times amount purified water, stir and make formation suspension, add the concentrated nitric acid (commercially available product) that mass concentration is about 68% while stirring and adjust pH of suspension to 2, A liquid must be clarified;
(2) take chitosan, add 50 weight times amount 1.0% acetic acid solutions, be stirred to chitosan and dissolve completely, filter, obtain B liquid;
(3) A liquid is mixed homogeneously with B liquid, add 25% sodium hydroxide solution and regulate pH >=10;
(4) continue stirring after 12 hours, stop stirring, material at room temperature ageing 48 hours, filter, taking precipitate deionized water wash to filtrate is neutral;
(5) prepare the PBS buffer 1000kg of pH6.0, mixed by precipitate, mixing speed 40rpm with PBS buffer, open 2000rpm homogenizing 30 minutes simultaneously, stop homogenizing, continue stirring 3 hours, stop stirring, discharging, obtains pluralgel.
Get described gel and add customary adjuvant, adopt common process to obtain spray.
Embodiment 8
Raw material: modified hydroxylapatite 40kg, the chitosan 10kg of the preparation of hydroxyapatite 20kg, embodiment 1
Described in the present embodiment, the preparation method of hydroxyapatite-chitosan plural gel comprises the steps:
(1) take hydroxyapatite and modified hydroxylapatite, add 15 weight times amount purified water, stir and make formation suspension, add the concentrated nitric acid (commercially available product) that mass concentration is about 68% while stirring and adjust pH of suspension to 2, A liquid must be clarified;
(2) take chitosan, add 100 weight times amount 0.4% acetic acid solutions, be stirred to chitosan and dissolve completely, filter, obtain B liquid;
(3) A liquid is mixed homogeneously with B liquid, add 5% sodium hydroxide solution and regulate pH >=10;
(4) continue stirring after 12 hours, stop stirring, material at room temperature ageing 36 hours, filter, taking precipitate deionized water wash to filtrate is neutral;
(5) prepare the PBS buffer 1500kg of pH6.5, mixed by precipitate, mixing speed 60rpm with PBS buffer, open 5000rpm homogenizing 10 minutes simultaneously, stop homogenizing, continue stirring 2 hours, stop stirring, discharging, obtains pluralgel.
Get described gel and add customary adjuvant, adopt common process to obtain membrane.
Embodiment 9
Raw material: modified hydroxylapatite 50kg, the chitosan 40kg of the preparation of hydroxyapatite 10kg, embodiment 3
Described in the present embodiment, the preparation method of hydroxyapatite-chitosan plural gel comprises the steps:
(1) take hydroxyapatite and modified hydroxylapatite, add 20 weight times amount purified water, stir and make formation suspension, add the concentrated nitric acid (commercially available product) that mass concentration is about 68% while stirring and adjust pH of suspension to 2, A liquid must be clarified;
(2) take chitosan, add 70 weight times amount 0.8% acetic acid solutions, be stirred to chitosan and dissolve completely, filter, obtain B liquid;
(3) A liquid is mixed homogeneously with B liquid, add 15% sodium hydroxide solution and regulate pH >=10;
(4) continue stirring after 12 hours, stop stirring, material at room temperature ageing 24 hours, filter, taking precipitate deionized water wash to filtrate is neutral;
(5) prepare the PBS buffer 3000kg of pH7.0, mixed by precipitate, mixing speed 30rpm with PBS buffer, open 3000rpm homogenizing 25 minutes simultaneously, stop homogenizing, continue stirring 1 hour, stop stirring, discharging, obtains pluralgel.
Get described gel and filmogen and other customary adjuvant, adopt common process to obtain gel.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (10)
1. a modified hydroxylapatite, is characterized in that, described modified hydroxylapatite is hydroxyapatite and appropriate Al
3+, Na
+, K
+and Mg
2+carry out the complex of degree of depth mineralising.
2. modified hydroxylapatite according to claim 1, is characterized in that, is prepared by following raw material: hydroxyapatite 100-300 weight portion, aluminium hydroxide 1-5 weight portion, sodium chloride 20-70 weight portion, potassium chloride is 2-10 weight portion, magnesium chloride 20-70 weight portion.
3. modified hydroxylapatite according to claim 1 and 2, is characterized in that, is prepared by following raw material: hydroxyapatite 200 weight portion, aluminium hydroxide 2 weight portion, sodium chloride 45 weight portion, potassium chloride 6 weight portion, magnesium chloride 45 weight portion.
4. a preparation method for the arbitrary described modified hydroxylapatite of claim 1-3, is characterized in that, comprise the steps:
(1) take hydroxyapatite, the aluminium hydroxide of selected weight portion, add concentrated nitric acid, stir and make, to dissolving completely, to obtain A liquid;
(2) take sodium chloride, potassium chloride, the magnesium chloride of selected weight portion, add water to be stirred to and dissolve completely, filter to obtain B liquid;
(3) by described A liquid and the mixing of B liquid, and adjust ph is >=10, obtains white suspension;
(4) described suspension is stirred completely, and in left at room temperature ageing, it is neutral for filtering also taking precipitate washing to filtrate, dries, to obtain final product.
5. the preparation method of modified hydroxylapatite according to claim 4, is characterized in that, in described step (3), adopts sodium hydroxide solution adjust ph >=10 of 5%-25%.
6. the preparation method of the modified hydroxylapatite according to claim 4 or 5, it is characterized in that, in described step (1), the mass concentration of described concentrated nitric acid is 65-70%, and the addition of described concentrated nitric acid and the weight ratio of described hydroxyapatite and aluminium hydroxide total amount are 2-4:1.
7., according to the preparation method of the arbitrary described modified hydroxylapatite of claim 4-6, it is characterized in that, in described step (2), the weight ratio of the addition of described water and described sodium chloride, potassium chloride and magnesium chloride total amount is 2-5:1.
8. according to the preparation method of the arbitrary described modified hydroxylapatite of claim 4-7, it is characterized in that, in described step (4), described white suspension is little up to stirring completely in 20-50rpm Keep agitation 2-6, and the time of described still aging step is 12-48 hour.
9. according to the preparation method of the arbitrary described modified hydroxylapatite of claim 4-8, it is characterized in that, in described step (4), also comprise that the described modified hydroxylapatite after drying is ground into particle diameter is 200-400 object step.
10. the arbitrary described modified hydroxylapatite of claim 1-3 has in preparation the purposes improved in the hydroxyapatite-chitosan plural gel of gingivitis effect.
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| JPH0629126B2 (en) * | 1989-03-29 | 1994-04-20 | 京都大学長 | Coating method of bioactive hydroxyapatite film |
| CN101703797B (en) * | 2009-12-07 | 2015-03-04 | 常熟致圆微管技术有限公司 | Fluorine-substituted apatite coating on surface of biologic medical magnesium or alloy thereof and preparation method |
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