A kind of adhesive type hydrogel and its preparation method and application
Technical field
The invention belongs to hydrogel fields, in particular to a kind of to have strongly adherent hydrogel and its preparation in wet structure and answer
With.
Background technique
Currently, more and more due to moving improper caused cartilage damage.In addition, excessively walking and long-term weight bearing is also
The common inducement of bone articular cartilage defect.Articular cartilage is once damage, itself cannot be repaired, and prognosis is bad, without special efficacy
Treatment method.Currently, the treatment that cartilage tissue engineered research is cartilage damage brings great hope.Organizational project
Three basic elements are timbering material, seed cell and growth factor.Current timbering material is easily lost from tissue site, sternly
Weight limits the clinical application of timbering material.Therefore, developing one kind, to have strongly adherent timbering material extremely urgent.
Recently " Science " reports a kind of novel strong bonding agent, which has bridge joint polymer surfaces and can
With two layers of hydrogel matrix formation of dissipation energy, the former is obtained with the bridge joint polymer with amino and coupling agent treatment stromal surface
It arrives, and is interpenetrated using electrostatic interaction, covalent bond and physics and make it have strong adhesive capacity, the latter passes through hysteresis effect
Amplified energy dissipation (Li J, Celiz AD, Yang J, Yang Q, Wamala I, Whyte W, Seo BR, Vasilyev NV,
Vlassak JJ,Suo Z,Mooney DJ.Tough adhesives for diverse wet
surfaces.Science.2017;357(6349):378.).This two layers synergistic effect makes the adhesive in the viscous of wetted surface
It is attached to reach 1000J m-2More than, hence it is evident that be higher than existing adhesive, but its there is also mechanical strength not enough, easily from tissue be lost
The problem of.
Summary of the invention
The purpose of the present invention is to solve cartilage tissue engineered at present timbering material water-setting adhesivities and mechanical property
Contradiction between optimization solves what hydrogel mechanical strength in cartilage tissue engineered application process not enough, was easily lost from tissue
Problem, and a kind of adhesive type hydrogel is provided and its preparation method and application.
Invention adhesives type hydrogel is surface recombination (introducing) the bridge joint polymer in hybridized hydrogel, wherein hydridization
Hydrogel be in the hydrogel of the derivative and polyethylene glycol crosslinked in chitosan or chitosan hydridization organic/inorganic nano particle and
It obtains;The polyethylene glycol is the polyethylene glycol that end group is aldehyde radical;The bridge joint polymer includes large biological molecule material
Material and inorganic nano-particle;Wherein biological macromolecule material is chitosan, the derivative of chitosan, gelatin or collagen;
The inorganic nano-particle is Nano particles of silicon dioxide, hydroxyapatite nano particle, aluminium oxide nano grain
Son or nano silver.
The preparation method of invention adhesives type hydrogel follows these steps to realize:
One, the derivative of chitosan or chitosan is dissolved in deionized water, obtains chitosan solution, be aldehyde radical by end group
Polyethylene glycol be dissolved in deionized water, add inorganic nano-particle, obtain polyglycol solution, chitosan solution and poly- second
Glycol solution mixes, and obtains hydrogel;
Two, biological macromolecule material solution and inorganic nano-particle are mixed, bridge joint polymer is obtained after being sufficiently stirred;
Three, bridge joint polymer is added to the surface of hydrogel, obtains adhesive type hydrogel after viscous pressure;
Wherein the inorganic nano-particle is Nano particles of silicon dioxide, hydroxyapatite nano particle, aluminium oxide are received
Rice corpuscles or nano silver;
Biological macromolecule material described in step 2 is chitosan, the derivative of chitosan, gelatin or collagen.
Application of the present invention using adhesive type hydrogel as timbering material in cartilage damage reparation.
Compared with prior art, invention adhesives type hydrogel and preparation method thereof includes that following advantages and technology are imitated
Fruit:
1, subject hydrogel has strong viscosity, effect of the viscosity mainly due to bridging polymer;
2, hydrogel of the invention has excellent mechanical property, and mechanical property is mainly due to inorganic nano-particle
Hybridism;
3, hydrogel hierarchical design of the invention can improve the mechanical property and viscosity of hydrogel simultaneously;
4, hydrogel of the invention has porous structure, can be used as pharmaceutical carrier;
5, hydrogel good biocompatibility of the invention can coat the reparation that seed cell carries out cartilage defect;
6, the inorganic nano-particle in present invention bridge joint polymer can be used as crosslinking agent, cross-linked polymer, so that polymerization
Active force between object molecule is more closely, effective to improve viscosity.
Specific embodiment
Specific embodiment 1: present embodiment adhesive type hydrogel is the surface recombination (introducing) in hybridized hydrogel
Polymer is bridged, wherein hybridized hydrogel is miscellaneous in the hydrogel of the derivative and polyethylene glycol crosslinked in chitosan or chitosan
Change obtained from organic/inorganic nano particle;The polyethylene glycol is the polyethylene glycol that end group is aldehyde radical;The bridge joint polymerization
Object includes biological macromolecule material and inorganic nano-particle;Wherein biological macromolecule material be chitosan, chitosan derivative,
Gelatin or collagen;
The inorganic nano-particle is Nano particles of silicon dioxide, hydroxyapatite nano particle, aluminium oxide nano grain
Son or nano silver.
Present embodiment end group be aldehyde radical polyethylene glycol can directly be synthesized by RAFT, can also by polyethylene glycol with contain
What the small molecule compound of aldehyde radical was reacted.Small molecule compound containing aldehyde radical includes p -carboxybenzaldehyde etc..
Inorganic nano-particle is added in present embodiment hybridized hydrogel, inorganic nano-particle is embedded in the three-dimensional of hydrogel
In network structure, the three-dimensional structure of hydrogel is more closely knit, improves the mechanical property of hydrogel.Bridge inorganic nano in polymer
The action principle of particle: the inorganic nano-particle in bridge joint polymer can be used as crosslinking agent, cross-linked polymer, so that polymer
Active force between molecule is more closely, effective to improve viscosity.
Specific embodiment 2: the present embodiment is different from the first embodiment in that the derivative of the chitosan
For carboxymethyl chitosan or hydroxyethyl chitosan.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that the polyethylene glycol
Molecular weight is 500~10k Da.
Specific embodiment 4: the inorganic nano unlike one of present embodiment and specific embodiment one to three
The partial size of particle is 10~100 nanometers.
Specific embodiment 5: the preparation method of present embodiment adhesive type hydrogel follows these steps to implement:
One, the derivative of chitosan or chitosan is dissolved in deionized water, obtains chitosan solution, be aldehyde radical by end group
Polyethylene glycol be dissolved in deionized water, add inorganic nano-particle, obtain polyglycol solution, chitosan solution and poly- second
Glycol solution mixes, and obtains hydrogel;
Two, biological macromolecule material solution and inorganic nano-particle are mixed, bridge joint polymer is obtained after being sufficiently stirred;
Three, bridge joint polymer is added to the surface of hydrogel, obtains adhesive type hydrogel after viscous pressure;
Wherein the inorganic nano-particle is Nano particles of silicon dioxide, hydroxyapatite nano particle, aluminium oxide are received
Rice corpuscles or nano silver;
Biological macromolecule material described in step 2 is chitosan, the derivative of chitosan, gelatin or collagen.
Specific embodiment 6: present embodiment and polyglycol solution in step 1 unlike specific embodiment five
Concentration be 0.5wt%~5wt%.
Specific embodiment 7: present embodiment is unlike specific embodiment five or six in step 1 in hydrogel
The concentration of inorganic nano-particle is 5wt%~10wt%.
Specific embodiment 8: being bridged in step 2 unlike one of present embodiment and specific embodiment five to seven
The concentration of inorganic nano-particle is 5wt%~10wt% in polymer.
Specific embodiment 9: being bridged in step 2 unlike one of present embodiment and specific embodiment five to eight
The concentration of biological macromolecule material is 10~50mg/mL in polymer.
Specific embodiment 10: being bridged in step 2 unlike one of present embodiment and specific embodiment five to nine
Also contain n-hydroxysuccinimide (NHS) and inferior amine salt hydrochlorate (EDC) in polymer.
N-hydroxysuccinimide in present embodiment is as catalyst, and inferior amine salt hydrochlorate is as dehydrating agent.
Specific embodiment 11: present embodiment bridges N- hydroxyl in polymer unlike specific embodiment ten
(end) concentration of succinimide (NHS) is 6~12mg/mL, 1- (3- dimethylamino-propyl) -3- ethyl-carbodiimide hydrochloride
(EDC) (end) concentration is 6~12mg/mL.
Specific embodiment 12: present embodiment using adhesive type hydrogel described in specific embodiment one as
Application of the timbering material in cartilage damage reparation.
Embodiment one: the preparation method of the present embodiment adhesive type hydrogel follows these steps to implement:
One, hydroxyethyl chitosan is dissolved in deionized water, obtains hydroxyethyl chitosan solution (40mg/mL, 20kDa),
The polyethylene glycol that p -carboxybenzaldehyde blocks is dissolved in deionized water, the nano-silicon dioxide particle of 10wt% is added
(9nm), mixing 3min obtain polyglycol solution (60mg/mL, 5kDa), and chitosan solution and polyglycol solution mix,
Obtain hydrogel;
Two, the nano-silicon dioxide particle of 10wt% is added into hydroxyethyl chitosan (40mg/mL, 20kDa) solution
After mixing, 12h is sufficiently stirred in (9nm), obtains bridge joint polymer;
Three, bridge joint polymer is added to the surface of hydrogel, obtains adhesive type hydrogel after pressing 1min.
The mechanical property of hydrogel is measured with rheometer.The rheological behaviour of hydrogel is in TA AR2000ex stress
It is tested in control rheometer (TA Instruments, USA), fixture is the parallel-plate that diameter is 20mm.By what is prepared
Hydrogel solution is added rapidly to be preheated on 37 DEG C of plate, gap width 1mm.Detect elasticity modulus (G') and loss modulus
The function of (G ") at any time characterizes the gelatination property of preparation.The G ' of the hydrogel of the embodiment is 859Pa.
The viscosity characterization of hydrogel is by bonding polyethylene terephthalate film (PET film) come what is be measured.
Prepared cohesive hydrogel is sliced, length and width, thick respectively 50mm, 10mm and 4mm.PET film also uses identical size,
Bond area is 20mm2.After pressing 1min after bonding, to be tested on INSTRON tensilometer, initial distance is 20mm,
Tensile speed is 5mm/min.The adhesive strength of the cohesive hydrogel of the embodiment is 412kPa.
Embodiment two: the preparation method of the present embodiment adhesive type hydrogel follows these steps to implement:
One, hydroxyethyl chitosan is dissolved in deionized water, dilute acetic acid solution is added and adjusts pH, obtains chitosan solution
The polyethylene glycol that end group is aldehyde radical is dissolved in deionized water, adds 10wt%'s by (100mg/mL, 10kDa, pH=6.5)
Nano alumina particles (25nm), mixing 1min obtain polyglycol solution (100mg/mL, 1kDa), chitosan solution and poly- second
Glycol solution mixes, and obtains hydrogel;
Two, n-hydroxysuccinimide (NHS) and 1- are added into chitosan (10mg/mL, 10kDa, pH6.5) solution
(3- dimethylamino-propyl) -3- ethyl-carbodiimide hydrochloride (EDC), adds the nano alumina particles of 10wt%
After mixing, 12h is sufficiently stirred in (25nm), obtains bridge joint polymer, and the concentration for bridging hydroxyethyl chitosan in polymer is
12mg/mL, the concentration of n-hydroxysuccinimide are 12mg/mL, 1- (3- dimethylamino-propyl) -3- ethyl carbodiimide hydrochloride
The concentration of salt is 12mg/mL;
Three, bridge joint polymer is added to the surface of hydrogel, obtains adhesive type hydrogel after pressing 1min.
The mechanical property of hydrogel is measured with rheometer.The rheological behaviour of hydrogel is in TA AR2000ex stress
It is tested in control rheometer (TA Instruments, USA), fixture is the parallel-plate that diameter is 20mm.By what is prepared
Hydrogel solution is added rapidly to be preheated on 37 DEG C of plate, gap width 1mm.Detect elasticity modulus (G') and loss modulus
The function of (G ") at any time characterizes the gelatination property of preparation.The G ' of the hydrogel of the embodiment is 1350Pa.
The viscosity characterization of hydrogel is by bonding polyethylene terephthalate film (PET film) come what is be measured.
Prepared cohesive hydrogel is sliced, length and width, thick respectively 50mm, 10mm and 4mm.PET film also uses identical size,
Bond area is 20mm2.After pressing 1min after bonding, to be tested on INSTRON tensilometer, initial distance is 20mm,
Tensile speed is 5mm/min.The adhesive strength of the cohesive hydrogel of the embodiment is 363kPa.
Comparative example one: it is not introduced into bridge joint polymer
Hydroxyethyl chitosan solution (60mg/mL, 80k Da) is respectively configured with deionized water and end group is the poly- second of aldehyde radical
Glycol solution (100mg/mL, 2k Da), adds the nanometer hydroxyapatite (25nm) of 5wt%, and mixing 1min forms water-setting
Glue.
The mechanical property of hydrogel is measured with rheometer.The rheological behaviour of hydrogel is in TA AR2000ex stress
It is tested in control rheometer (TA Instruments, USA), fixture is the parallel-plate that diameter is 20mm.By what is prepared
Hydrogel solution is added rapidly to be preheated on 37 DEG C of plate, gap width 1mm.Detect elasticity modulus (G') and loss modulus
The function of (G ") at any time characterizes the gelatination property of preparation.The G ' of the hydrogel of the embodiment is 1096Pa.
The viscosity characterization of hydrogel is by bonding polyethylene terephthalate film (PET film) come what is be measured.
Prepared cohesive hydrogel is sliced, length and width, thick respectively 50mm, 10mm and 4mm.PET film also uses identical size,
Bond area is 20mm2.After pressing 1min after bonding, to be tested on INSTRON tensilometer, initial distance is 20mm,
Tensile speed is 5mm/min.The adhesive strength of the cohesive hydrogel of the embodiment is 0.6kPa, does not have adhesion property substantially.
Comparative example two: inorganic nano-particle is not introduced into bridge joint polymer
Hydroxyethyl chitosan solution (60mg/mL, 80k Da) is respectively configured with deionized water and end group is the poly- second of aldehyde radical
Glycol solution (100mg/mL, 2k Da), adds the nanometer hydroxyapatite (25nm) of 5wt%, and mixing 1min forms water-setting
Glue.
Bridging polymer is that hydroxyethyl chitosan solution (final concentration of 12mg/mL, 80k Da) is spare.
The viscosity characterization of hydrogel is by bonding polyethylene terephthalate film (PET film) come what is be measured.
Prepared cohesive hydrogel is sliced, length and width, thick respectively 50mm, 10mm and 4mm.PET film also uses identical size,
Bond area is 20mm2.After pressing 1min after bonding, to be tested on INSTRON tensilometer, initial distance is 20mm,
Tensile speed is 5mm/min.The adhesive strength of the cohesive hydrogel of the embodiment is 92kPa, has certain viscosity, but phase
For the bridge joint polymer containing inorganic nano-particle, viscosity is substantially reduced.
Comparative example three: hybridized nanometer particle is not introduced into hydrogel
Hydroxyethyl chitosan solution (60mg/mL, 80k Da) is respectively configured with deionized water and end group is the poly- second of aldehyde radical
Glycol solution (100mg/mL, 2k Da), mixing 1min form hydrogel;
The nano-silicon dioxide particle of 10wt% is added into hydroxyethyl chitosan (12mg/mL, 80k Da) solution
After mixing, 12h is sufficiently stirred in (9nm), obtains bridge joint polymer.
Prepared bridge joint polymer is added to the surface of hydrogel, pressing 1min can be obtained adhesive type water-setting
Glue.
The mechanical property of hydrogel is measured with rheometer.The rheological behaviour of hydrogel is in TA AR2000ex stress
It is tested in control rheometer (TA Instruments, USA), fixture is the parallel-plate that diameter is 20mm.By what is prepared
Hydrogel solution is added rapidly to be preheated on 37 DEG C of plate, gap width 1mm.Detect elasticity modulus (G') and loss modulus
The function of (G ") at any time characterizes the gelatination property of preparation.The G ' of the hydrogel of the embodiment is 521Pa.
The viscosity characterization of hydrogel is by bonding polyethylene terephthalate film (PET film) come what is be measured.
Prepared cohesive hydrogel is sliced, length and width, thick respectively 50mm, 10mm and 4mm.PET film also uses identical size,
Bond area is 20mm2.After pressing 1min after bonding, to be tested on INSTRON tensilometer, initial distance is 20mm,
Tensile speed is 5mm/min.The adhesive strength of the cohesive hydrogel of the embodiment is 193kPa, has excellent tissue adhension
Property, but mechanical property is weaker.